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Статті в журналах з теми "Video projector"

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Автор: Grafiati

Опубліковано: 24 липня 2022

Оновлено: 8 серпня 2022

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1

Sharma, Atul, Sushil Raut, Kohei Shimasaki, Taku Senoo, and Idaku Ishii. "Visual-Feedback-Based Frame-by-Frame Synchronization for 3000 fps Projector–Camera Visual Light Communication." Electronics 10, no. 14 (July 8, 2021): 1631. http://dx.doi.org/10.3390/electronics10141631.

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This paper proposes a novel method for synchronizing a high frame-rate (HFR) camera with an HFR projector, using a visual feedback-based synchronization algorithm for streaming video sequences in real time on a visible-light communication (VLC)-based system. The frame rates of the camera and projector are equal, and their phases are synchronized. A visual feedback-based synchronization algorithm is used to mitigate the complexities and stabilization issues of wire-based triggering for long-distance systems. The HFR projector projects a binary pattern modulated at 3000 fps. The HFR camera system operates at 3000 fps, which can capture and generate a delay signal to be given to the next camera clock cycle so that it matches the phase of the HFR projector. To test the synchronization performance, we used an HFR projector–camera-based VLC system in which the proposed synchronization algorithm provides maximum bandwidth utilization for the high-throughput transmission ability of the system and reduces data redundancy efficiently. The transmitter of the VLC system encodes the input video sequence into gray code, which is projected via high-definition multimedia interface streaming in the form of binary images 590 × 1060. At the receiver, a monochrome HFR camera can simultaneously capture and decode 12-bit 512 × 512 images in real time and reconstruct a color video sequence at 60 fps. The efficiency of the visual feedback-based synchronization algorithm is evaluated by streaming offline and live video sequences, using a VLC system with single and dual projectors, providing a multiple-projector-based system. The results show that the 3000 fps camera was successfully synchronized with a 3000 fps single-projector and a 1500 fps dual-projector system. It was confirmed that the synchronization algorithm can also be applied to VLC systems, autonomous vehicles, and surveillance applications.

2

Nicolas, Christophe, Jean-Baptiste Leprince, and Jean-Pierre Huignard. "Stereoscopic LCD video projector." Journal of the Society for Information Display 2, no. 4 (1994): 165. http://dx.doi.org/10.1889/1.1984927.

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3

Ymauchi, K., H. Kanayama, T. Miwa, K. Takeuchi, N. Nakatani, and Y. Marusita. "High resolution LC video projector." IEEE Transactions on Consumer Electronics 36, no. 3 (1990): 430–36. http://dx.doi.org/10.1109/30.103156.

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4

von Jungenfeld, Rocio. "Portable Projections: Analyzing Cocreated Site-Specific Video Walks." Leonardo 53, no. 5 (October 2020): 492–97. http://dx.doi.org/10.1162/leon_a_01794.

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The author discusses key findings of a series of video walks developed as part of her practice-based PhD research (2011–2014). Four video walks were produced for handheld projectors and tested in four different public spaces. The first video walks ( The Surface Inside, 2011; I-Walk, 2012) were guided, and only one handheld projector was available. The latter ( Walk-itch, 2013; (wh)ere land, 2014) were created for multiple handheld projectors, offering participants a cocreative role. Onsite observations revealed a shift in participant engagement between earlier and later video walks. A threefold method for analyzing audiovisual documentation also emerged during the research.

5

Kalisperakis, Ilias, Lazaros Grammatikopoulos, Elli Petsa, and George Karras. "A Structured-Light Approach for the Reconstruction of Complex Objects." Geoinformatics FCE CTU 6 (December 21, 2011): 259–66. http://dx.doi.org/10.14311/gi.6.32.

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Recently, one of the central issues in the fields of Photogrammetry, Computer Vision, Computer Graphics and Image Processing is the development of tools for the automatic reconstruction of complex 3D objects. Among various approaches, one of the most promising is Structured Light 3D scanning (SL) which combines automation and high accuracy with low cost, given the steady decrease in price of cameras and projectors. SL relies on the projection of different light patterns, by means of a video projector, on 3D object sur faces, which are recorded by one or more digital cameras. Automatic pattern identification on images allows reconstructing the shape of recorded 3D objects via triangulation of the optical rays corresponding to projector and camera pixels. Models draped with realistic phototexture may be thus also generated, reproducing both geometry and appearance of the 3D world. In this context, subject of our research is a synthesis of state-of-the-art as well as the development of novel algorithms, in order to implement a 3D scanning system consisting, at this stage, of one consumer digital camera (DSLR) and a video projector. In the following, the main principles of structured light scanning and the algorithms implemented in our system are presented, and results are given to demonstrate the potential of such a system. Since this work is part of an ongoing research project, future tasks are also discussed.

6

Sharma, Atul, Sushil Raut, Kohei Shimasaki, Taku Senoo, and Idaku Ishii. "HFR Projector Camera Based Visible Light Communication System for Real-Time Video Streaming." Sensors 20, no. 18 (September 19, 2020): 5368. http://dx.doi.org/10.3390/s20185368.

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This study develops a projector–camera-based visible light communication (VLC) system for real-time broadband video streaming, in which a high frame rate (HFR) projector can encode and project a color input video sequence into binary image patterns modulated at thousands of frames per second and an HFR vision system can capture and decode these binary patterns into the input color video sequence with real-time video processing. For maximum utilization of the high-throughput transmission ability of the HFR projector, we introduce a projector–camera VLC protocol, wherein a multi-level color video sequence is binary-modulated with a gray code for encoding and decoding instead of pure-code-based binary modulation. Gray code encoding is introduced to address the ambiguity with mismatched pixel alignments along the gradients between the projector and vision system. Our proposed VLC system consists of an HFR projector, which can project 590 × 1060 binary images at 1041 fps via HDMI streaming and a monochrome HFR camera system, which can capture and process 12-bit 512 × 512 images in real time at 3125 fps; it can simultaneously decode and reconstruct 24-bit RGB video sequences at 31 fps, including an error correction process. The effectiveness of the proposed VLC system was verified via several experiments by streaming offline and live video sequences.

7

Draréni, Jamil, Sébastien Roy, and Peter Sturm. "Methods for geometrical video projector calibration." Machine Vision and Applications 23, no. 1 (March 12, 2011): 79–89. http://dx.doi.org/10.1007/s00138-011-0322-3.

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8

Drouin, Marc-Antoine, Pierre-Marc Jodoin, and Julien Prémont. "Camera–projector matching using unstructured video." Machine Vision and Applications 23, no. 5 (July 31, 2011): 887–902. http://dx.doi.org/10.1007/s00138-011-0358-4.

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9

Dussan Molinos, Laura, Cord Huchzermeyer, Robert Lämmer, Jan Kremers, and Folkert K. Horn. "Blue–Yellow VEP with Projector-Stimulation in Glaucoma." Graefe's Archive for Clinical and Experimental Ophthalmology 260, no. 4 (November 25, 2021): 1171–81. http://dx.doi.org/10.1007/s00417-021-05473-w.

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Abstract Background and aim In the past, increased latencies of the blue-on-yellow pattern visually evoked potentials (BY-VEP), which predominantly originate in the koniocellular pathway, have proven to be a sensitive biomarker for early glaucoma. However, a complex experimental setup based on an optical bench was necessary to obtain these measurements because computer screens lack sufficient temporal, spatial, spectral, and luminance resolution. Here, we evaluated the diagnostic value of a novel setup based on a commercially available video projector. Methods BY-VEPs were recorded in 126 participants (42 healthy control participants, 12 patients with ocular hypertension, 17 with “preperimetric” glaucoma, and 55 with perimetric glaucoma). Stimuli were created with a video projector (DLP technology) by rear projection of a blue checkerboard pattern (460 nm) for 200 ms (onset) superimposed on a bright yellow background (574 nm), followed by an offset interval where only the background was active. Thus, predominantly S-cones were stimulated while L- and M-cone responses were suppressed by light adaptation. Times of stimulus onset to VEP onset-trough (N-peak time) and offset-peak (P-peak time) were analyzed after age-correction based on linear regression in the normal participants. Results The resulting BY-VEPs were quite similar to those obtained in the past with the optical bench: pattern-onset generated a negative deflection of the VEP, whereas the offset-response was dominated by a positive component. N-peak times were significantly increased in glaucoma patients (preperimetric 136.1 ± 10 ms, p < 0.05; perimetric 153.1 ± 17.8 ms, p < 0.001) compared with normal participants (123.6 ± 7.7 ms). Furthermore, they were significantly correlated with disease severity as determined by visual field losses retinal nerve fiber thinning (Spearman R = –0.7, p < 0.001). Conclusions Video projectors can be used to create optical stimuli with high temporal and spatial resolution, thus potentially enabling sophisticated electrophysiological measurements in clinical practice. BY-VEPs based on such a projector had a high diagnostic value for detection of early glaucoma. Registration of study Registration site: www.clinicaltrials.gov Trial registration number: NCT00494923.

10

Jing, Chang Long, Qi Bin Feng, Ying Song Zhang, Guang Lei Yang, Zhi Gang Song, Zhi Qi Pei, and Guo Qiang Lv. "LED-Based 3-DMD Volumetric 3D Display." Applied Mechanics and Materials 596 (July 2014): 442–45. http://dx.doi.org/10.4028/www.scientific.net/amm.596.442.

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A solid-state volumetric true 3D display developed by Hefei University of Technology consists of two main components: a high-speed video projector and a stack of liquid crystal shutters. The shutters are based on polymer stabilized cholesteric texture material, presenting different states that can be switched by different voltage. The high-speed video projector includes LED-based light source and tree-chip digital micro-mirror devices modulating RGB lights. A sequence of slices of three-dimensional images are projected into the liquid crystal shutters locating at the proper depth, forming a true 3D image depending on the human vision persistence. The prototype is developed. The measurement results show that the screen brightness can reach 149 nit and no flickers can be perceived.

11

He, Wan Tao, Xiang Lin Meng, and Can Zhao. "Phase Error Immunity Optical Measurement System." Advanced Materials Research 142 (October 2010): 194–98. http://dx.doi.org/10.4028/www.scientific.net/amr.142.194.

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In this paper, a 3D shape measurement system based on a digital fringe projection and phase-shifting technique was described. The fringe generated by a computer was projected onto the object by utilizing a digital video projector. Four steps phase shifting algorithm was used to calculate the 2π wrapping phase, and a heterodyne principle was used to unwrap the phase to obtain the real phase. Then the 3D coordinates object was calculated base on stereo vision algorithm by using the real phase as a constraint. Experiments demonstrated that the system was not sensitive to the phase error caused by the DVP’s nonlinearity.

12

Rashidizad, Hossein, and Abdolreza Rahimi. "Effect of Scanning Depth of Field on the Measurement Noises of Developed Fringe Projection 3D Scanning System." Applied Mechanics and Materials 624 (August 2014): 322–26. http://dx.doi.org/10.4028/www.scientific.net/amm.624.322.

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In this paper, some tests was performed to evaluate the effect of scanning depth of field on the measurement error and the density of the point cloud obtained from the developed non-contact 3D scanner by measurement error of about ±0.05mm, which was taken from a single digital camera and a 3LCD video projector as a source projecting the structured light pattern. To perform this analysis, the scanning depth changes occurred in steps. However, due to the effect that the video projector focus has on the sharpness of the projected image pattern and consequently the measurement noise created, the tests were repeated again with the change in focus at every step. The experimental results suggest the need to define the optimum scanning depth (less than 60cm), to provide a stable and acceptable precision, and shows the great effect of scanning depth of field and sharpness of the projected pattern on the amount of measurement noise and density of the points cloud.

13

Papazoglou, D. G., M. Loulakis, G. Siganakis, and N. A. Vainos. "Holographic read - write projector of video images." Optics Express 10, no. 6 (March 25, 2002): 280. http://dx.doi.org/10.1364/oe.10.000280.

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14

Blystone, Robert V. "Presentation of the Microscopy Image." Microscopy Today 6, no. 6 (August 1998): 28–29. http://dx.doi.org/10.1017/s1551929500068206.

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Microscopists have special challenges when presenting image data to audiences, Issues such as image size, resolution, and labeling are related to the format of the presented image. Contact prints, transparencies, 35 mm film, and projected video of digital images are some of the output options possible for microscopy presentation. This brings us to a question which Jonathan Krupp of the University of California, Santa Cruz, recently posed to the Microscopy listserver;“In this age of digital imaging, is a film recorder still useful? The last presentation I went to was all PowerPoint ‘slides’, but shown directly from a computer to a video projector, no film to be seen.”

15

Murano, Kanji, Masami Himuro, Yoshihisa Watanabe, and Minehiro Tonosaki. "A Video Projector Using a PLZT Light Shutter Array." Japanese Journal of Applied Physics 24, S2 (January 1, 1985): 139. http://dx.doi.org/10.7567/jjaps.24s2.139.

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16

NAKATSU, MASASHI. "Presentation system by personal computer connecting with video projector." Journal of the Japan Society of Precision Engineering 51, no. 10 (1985): 1870–73. http://dx.doi.org/10.2493/jjspe1933.51.1870.

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17

INOUE, Tomoyuki, Shingo KAGAMI, and Koichi HASHIMOTO. "2P2-E15 Video Projection with Reduced Motion Blur Using a High-Speed DMD Projector." Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2008 (2008): _2P2—E15_1—_2P2—E15_4. http://dx.doi.org/10.1299/jsmermd.2008._2p2-e15_1.

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18

Pongrácz, Péter, András Péter, and Ádám Miklósi. "Familiarity with images affects how dogs (Canis familiaris) process life-size video projections of humans." Quarterly Journal of Experimental Psychology 71, no. 6 (January 1, 2018): 1457–68. http://dx.doi.org/10.1080/17470218.2017.1333623.

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A central problem of behavioural studies providing artificial visual stimuli for non-human animals is to determine how subjects perceive and process these stimuli. Especially in the case of videos, it is important to ascertain that animals perceive the actual content of the images and are not just reacting to the motion cues in the presentation. In this study, we set out to investigate how dogs process life-sized videos. We aimed to find out whether dogs perceive the actual content of video images or whether they only react to the videos as a set of dynamic visual elements. For this purpose, dogs were presented with an object search task where a life-sized projected human was hiding a target object. The videos were either normally oriented or displayed upside down, and we analysed dogs’ reactions towards the projector screen after the video presentations, and their performance in the search task. Results indicated that in the case of the normally oriented videos, dogs spontaneously perceived the actual content of the images. However, the ‘Inverted’ videos were first processed as a set of unrelated visual elements, and only after some exposure to these videos did the dogs show signs of perceiving the unusual configuration of the depicted scene. Our most important conclusion was that dogs process the same type of artificial visual stimuli in different ways, depending on the familiarity of the depicted scene, and that the processing mode can change with exposure to unfamiliar stimuli.

19

Szpygiel, Jędrzej, Maksymilian Chlipała, Rafał Kukołowicz, Moncy Idicula, and Tomasz Kozacki. "Distortion correction for wide angle holographic projector." Photonics Letters of Poland 13, no. 4 (December 30, 2021): 79. http://dx.doi.org/10.4302/plp.v13i4.1125.

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This letter presents distortion correction method enabling distortion minimized, large size image in wide angle holographic projector. The technique applies numerical predistortion of an input image used for hologram generation. It is based on estimation of distortion coefficients by comparing optically reconstructed point test chart with the original one. Obtained experimental results prove that the technique allows reconstruction of high-quality image. Full Text: PDF ReferencesM. Makowski, Experimental Aspects of Holographic Projection with a Liquid-Crystal-on-Silicon Spatial Light Modulator, in Holographic Materials and Optical Systems, M. Kumar, ed. (IntechOpen, 2019). CrossRef H. Pang, A. Cao, W. Liu, L. Shi, and Q. Deng, "Effective method for further magnifying the image in holographic projection under divergent light illumination", Appl. Opt. 58, 8713 (2019). CrossRef Y. Qi, C. Chang, and J. Xia, "Speckleless holographic display by complex modulation based on double-phase method", Opt. Express 24, 30368 (2016). CrossRef E. Buckley, "Holographic Laser Projection", J. Display Technol. 99, 1 (2010). DirectLink M. Chlipała, T. Kozacki, H. Yeom, J. Martinez-Carranza, R. Kukołowicz, J. Kim, J. Yang, J. Choi, J. Pi, and C. Hwang, "Wide angle holographic video projection display", Opt. Lett. 46, 4956 (2021). CrossRef Z. He, X. Sui, L. Cao and G. Jin, "Image-Distortion Correction Algorithm for Computer-Generated Holographic Display," 2018 IEEE 27th International Symposium on Industrial Electronics (ISIE), 1331 (2018). CrossRef A. Kaczorowski, G.S. Gordon, A. Palani, S. Czerniawski and T.D. Wilkinson, "Optimization-Based Adaptive Optical Correction for Holographic Projectors", J. Display Technol. 11(7), 596 (2015). CrossRef Z. He, X. Sui, G. Jin, L. Cao, "Distortion-Correction Method Based on Angular Spectrum Algorithm for Holographic Display", IEEE Trans. Industr. Inform. 15, 6162 (2019). CrossRef O. Mendoza-Yero, G. Mínguez-Vega, and J. Lancis, "Encoding complex fields by using a phase-only optical element", Opt. Lett. 39, 1740 (2014). CrossRef T. Kozacki, K. Falaggis, "Angular spectrum method with compact space–bandwidth: generalization and full-field accuracy", Appl. Opt. 55, 5014 (2016). CrossRef

20

Kurumada, Akira, Noriyoshi Asakura, Hiroki Suzuki, Chihiro Masuda, and Hideo Takahashi. "Investigation of 3D display using moving screens and video projector." JOURNAL OF THE ILLUMINATING ENGINEERING INSTITUTE OF JAPAN 78, Appendix (1994): 174. http://dx.doi.org/10.2150/jieij1980.78.appendix_174.

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21

Banks, Lewis, Martin Birch, Daniel Krueerke, Edward Buckley, Adrian Cable, Nic Lawrence, and Peter Mash. "73.4: Real-time Diffractive Video Projector Employing Ferroelectric LCOS SLM." SID Symposium Digest of Technical Papers 37, no. 1 (2006): 2018. http://dx.doi.org/10.1889/1.2433453.

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22

Tsuruta, Masahiko, and Neil Neubert. "An Advanced High-Resolution, High-Brightness LCD Color Video Projector." SMPTE Journal 101, no. 6 (June 1992): 399–403. http://dx.doi.org/10.5594/j02261.

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23

von Leupoldt, Andreas, Bettina Hartle-Bremerich, and Bernhard Dahme. "Application of video glasses for sustained affective picture presentations: A comparison with video projector presentations." Behavior Research Methods 37, no. 4 (November 2005): 602–7. http://dx.doi.org/10.3758/bf03192730.

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24

Sholikhudin, Anang. "IMPLEMENTASI MEDIA VIDEO INTERAKTIF DALAM MATA PELAJARAN Al-QUR’AN DAN Al-HADITS DI MI DARUT TAQWA SENGONAGUNG PURWOSARI PASURUAN." Jurnal Mu’allim 2, no. 1 (October 20, 2020): 127–38. http://dx.doi.org/10.35891/muallim.v2i1.2326.

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Interactive Video Media in learning is a living image which is a picture in a frame where frame by frame is mechanically projected through the projector lens so that the screen looks alive. As with films, videos can depict an object moving together with natural sounds or sounds that are appropriate in learning. The formulation of the problems in this study are: 1. How is the implementation of interactive video media in the subject of al-Qur'an and al-Hadith at MI Darut Taqwa Sengonagung Purwosari Pasuruan? 2. What factors support and hinder the implementation of interactive video media in the subject of al-Qur'an and al-Hadith at MI Darut Taqwa Sengonagung Purwosari Pasuruan ?. The purpose of this study was to determine the implementation of interactive video media in the subject of al-Qur'an and al-Hadith and to determine the supporting and inhibiting factors for implementing interactive video media in the subjects of al-Qur'an and al-Hadith at MI Darut Taqwa Sengonagung Purwosari Pasuruan. . Data collection was carried out through observation, interviews, and documentation to get a complete picture and understanding of the two selected research focuses. The results showed (1) the implementation of interactive video learning at MI Darut Taqwa shows that learning using learning methods and media is quite flexible. This means that it is adjusted to the conditions of students. The learning method developed in the Interactive Video media learning is the question and answer method, the discussion method, and the demonstration method. (2) Supporting Factors for the Implementation of Interactive Video Media in Al-Qur'an and Al-Hadith Subjects at MI Darut Taqwa Sengonagung Purwosari Pasuruan Is: interactive video media makes it easy for students to understand lessons, using interactive video media of students' attention and interest very effective. While the inhibiting factor is that in implementing interactive video media the teacher requires time and careful preparation, so it requires a lot of time, too much media if you maximize learning interactive video media in the classroom.

25

Lund, Mark W. "Through a Cracked Lens: Alternate Views of Light Microscopy Part 3: Illuminating Illumination." Microscopy Today 4, no. 1 (February 1996): 10–11. http://dx.doi.org/10.1017/s1551929500066967.

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Did I ever tell you about my first optical enginsering project? It was a video projector which used many innovative ideas, including one of the first liquid crystal video displays. It was dssigned to be the brightest projector ever made and was used in a helmet mounted display prototype. My first job out of college was to gather the parts, put it together, and measure its characteristics. To make a long story short, I had to turn the room lights out to see the image! What made a 20,000-footlambert design into a 20- footlambert display? Illumination! I learned a lot about illumination in those few short weeks, and everything I learned is directly applicable to microscopes. In fact the whole science of illumination was developed by microscapists. Electron microscopes deal with exactly the same concepts.

26

Kuz’min, M. S., and S. A. Rogov. "Binary Phase SLMs Based on the LC Matrix of Video Projector." Technical Physics 63, no. 1 (January 2018): 83–85. http://dx.doi.org/10.1134/s1063784218010176.

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27

Huang, H. C., P. W. Cheng, H. S. Kwok, and S. K. Kwok. "A compact and high-resolution video projector based on silicon light valves." IEEE Transactions on Consumer Electronics 45, no. 4 (1999): 1144–49. http://dx.doi.org/10.1109/30.809195.

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28

HIROOKA, S. "Calibration Free Virtual Display System Using Video Projector onto Real Object Surface." IEICE Transactions on Information and Systems E89-D, no. 1 (January 1, 2006): 88–97. http://dx.doi.org/10.1093/ietisy/e89-d.1.88.

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29

Besharati Tabrizi, Leila, and Mehran Mahvash. "Augmented reality–guided neurosurgery: accuracy and intraoperative application of an image projection technique." Journal of Neurosurgery 123, no. 1 (July 2015): 206–11. http://dx.doi.org/10.3171/2014.9.jns141001.

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OBJECT An augmented reality system has been developed for image-guided neurosurgery to project images with regions of interest onto the patient's head, skull, or brain surface in real time. The aim of this study was to evaluate system accuracy and to perform the first intraoperative application. METHODS Images of segmented brain tumors in different localizations and sizes were created in 10 cases and were projected to a head phantom using a video projector. Registration was performed using 5 fiducial markers. After each registration, the distance of the 5 fiducial markers from the visualized tumor borders was measured on the virtual image and on the phantom. The difference was considered a projection error. Moreover, the image projection technique was intraoperatively applied in 5 patients and was compared with a standard navigation system. RESULTS Augmented reality visualization of the tumors succeeded in all cases. The mean time for registration was 3.8 minutes (range 2–7 minutes). The mean projection error was 0.8 ± 0.25 mm. There were no significant differences in accuracy according to the localization and size of the tumor. Clinical feasibility and reliability of the augmented reality system could be proved intraoperatively in 5 patients (projection error 1.2 ± 0.54 mm). CONCLUSIONS The augmented reality system is accurate and reliable for the intraoperative projection of images to the head, skull, and brain surface. The ergonomic advantage of this technique improves the planning of neurosurgical procedures and enables the surgeon to use direct visualization for image-guided neurosurgery.

30

Dzakhmisheva, I. S. "Innovative technologies in merchandising." Proceedings of the Voronezh State University of Engineering Technologies 82, no. 4 (January 20, 2021): 272–76. http://dx.doi.org/10.20914/2310-1202-2020-4-272-276.

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The article summarizes and systematizes modern high-tech digital tools that allow modeling the behavior of a modern consumer and ensuring the efficiency of the functioning of trade enterprises by increasing sales. It has been established that merchandising has an impressive arsenal of high-tech tools, which include: projection showcase, interactive showcase, virtual shelf, 3D showcase, Aislelabs and Prism Skylabs devices, mobile applications, Fetch Robotics and Lowe's robots, ERP system, Amazon Prime Air system, etc. A projection showcase is a showcase glass (screen) covered with a special film (opaque, translucent or completely transparent) of rear projection. A projector is installed behind the screen, which transmits an image to the screen, which is clearly visible from the outside. An interactive showcase (interactive wall, touch showcase) is a video screen that interacts with a person; most often, they use multitouch technology (touch showcases) and contactless sensor technology (Kinect showcases). A virtual shelf is an LCD panel or video wall, with a Kinect system attached to the back, which “reads” human movements and allows you to control the system from a distance. The 3D showcase is an electronic counter with technology that allows 3D images to be literally projected in the air, combined with motion sensors. The motion sensor allows the showcase to react to the trajectory of passers-by, that is, the showcase is static as long as no one walks past it, and as soon as the sensors detect the movement of a person in the reach, the showcase comes to life, the colors, lighting, picture change. Digital technologies in retail are a new interactive advertising tool for attracting and retaining customer attention. Due to the effect of surprise inherent in all interactive solutions in advertising, virtual showcases (interactive walls) attract attention, keep the visitor for a long time, stimulate to make a purchase or receive information.

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Lehmann, Jannis, Christian Tzschaschel, Manfred Fiebig, and Thomas Weber. "Microdisplays as a versatile tool for the optical simulation of crystal diffraction in the classroom." Journal of Applied Crystallography 52, no. 2 (March 26, 2019): 457–62. http://dx.doi.org/10.1107/s1600576719001948.

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Presented here is a flexible and low-cost setup for demonstrating X-ray, electron or neutron diffraction methods in the classroom. Using programmable spatial light modulators extracted from a commercial video projector, physical diffraction patterns are generated, in real time, of any two-dimensional structure which can be displayed on a computer screen. This concept enables hands-on experience beyond simplest-case scenarios of scattering phenomena, and for the students, the transfer to the regime of visible light greatly enhances intuitive understanding of diffraction in real and reciprocal space. The idea and working principle of the modified video projector are explained, technical advice is given for its choice and successful modification, and a Python-based open-source program code is provided. Program features include the design and interactive manipulation of two-dimensional crystal structures to allow a straightforward demonstration of concepts such as reciprocal space, structure factors, selection rules, symmetry and symmetry violation, as well as structural disorder. This approach has already proved helpful in teaching crystal diffraction to undergraduate students in materials science.

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He, Xing Zheng, Jing Lan Ma, and Wei Wang. "A Grating Generator for 3D Scanner Using CPLD." Applied Mechanics and Materials 462-463 (November 2013): 89–92. http://dx.doi.org/10.4028/www.scientific.net/amm.462-463.89.

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In the three-dimensional scanners (3D scanners), the grating generator is a key hardware. The commercial video projector is always used to act as the electronic grating generator normally. But there are some defects existed. Such as, the size is too large to setup in the case, it is not easy to be controlled by a single chip microcomputer, etc. To solve these problems, in this paper, a new type of grating generator was designed. A complex programmable logic device (CPLD) chip is used to control a liquid crystal on silicon (LCOS) video chip directly, and it works well.

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Al Smadi, Takialddin. "Modern Technology for Image processing and Computer vision -A Review." Journal of advanced Sciences and Engineering Technologies 1, no. 2 (May 21, 2018): 17–23. http://dx.doi.org/10.32441/jaset.v1i2.178.

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This survey outlines the use of computer vision in Image and video processing in multidisciplinary applications; either in academia or industry, which are active in this field.The scope of this paper covers the theoretical and practical aspects in image and video processing in addition of computer vision, from essential research to evolution of application.In this paper a various subjects of image processing and computer vision will be demonstrated ,these subjects are spanned from the evolution of mobile augmented reality (MAR) applications, to augmented reality under 3D modeling and real time depth imaging, video processing algorithms will be discussed to get higher depth video compression, beside that in the field of mobile platform an automatic computer vision system for citrus fruit has been implemented ,where the Bayesian classification with Boundary Growing to detect the text in the video scene. Also the paper illustrates the usability of the handed interactive method to the portable projector based on augmented reality. © 2018 JASET, International Scholars and Researchers Association

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Lewis, L., J. Jones, and E. Haynes. "Low-cost video-films in the teaching of undergraduate and postgraduate medical students." Journal of Telemedicine and Telecare 6, no. 2_suppl (August 2000): 45–47. http://dx.doi.org/10.1258/1357633001935545.

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The high cost of producing good-quality video-films for teaching has hindered the use of this method, which has been shown to improve significantly the efficiency of teaching and the retention of knowledge. During the last five years, a series of short video-films has been produced using inexpensive video-cameras and home video-recording and editing equipment. A variety of techniques were developed to allow recording of lecture presentations, while using the equipment as a teaching aid, without the need for technical staff. The positioning of the camera, the monitor, the slide projector and lighting were critical to the productions. Similar productions at low cost were obtained from recordings of operating theatre sessions, tutorials and clinical ward rounds. A survey of students exposed to teaching with video-film as part of a lecture presentation confirmed that the subject matter being taught was more easily understood and enjoyable and generated more discussions on than other forms of teaching.

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Isono, Haruo, Minoru Yasuda, Koji Miwa, Hideyuki Kanayama, and Chihiko Yamada. "40-inch Stereoscopic TV Display without Special Glasses Using Liquid Crystal Video Projector." Journal of the Institute of Television Engineers of Japan 46, no. 4 (1992): 518–25. http://dx.doi.org/10.3169/itej1978.46.518.

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Dong, Huan. "The Measurement of 3D Object Shape Based on Fourier Transform Profilometry." Advanced Materials Research 756-759 (September 2013): 678–81. http://dx.doi.org/10.4028/www.scientific.net/amr.756-759.678.

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In this paper, we present an optical profilometric technique for 3D shape measurement--Fourier Transform Profilometry (FTP). In contrast to other optical techniques, the grating pattern will in its spatial frequency fields as well as in its space-signal fields which projected onto the object surface and was Fourier-transformed and processed. This technique only requires a single fringe pattern up to no more than two to reproduce 3D object shape. FTP has a much higher sensitivity to the fringe quality than other techniques. We design a system which has a high-resolution system composed of a video projector and a digital camera. A fringe pattern of programming by computer is projected onto the free surface and its diagram is recorded by the camera. The deformed fringe pattern arising from the surface deformations is later compared to the unreformed (reference) one, leading to a phase map from which the free surface can be reconstructed after some series of processes.

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Bleier, M., and A. Nüchter. "TOWARDS ROBUST SELF-CALIBRATION FOR HANDHELD 3D LINE LASER SCANNING." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-2/W8 (November 13, 2017): 31–36. http://dx.doi.org/10.5194/isprs-archives-xlii-2-w8-31-2017.

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This paper studies self-calibration of a structured light system, which reconstructs 3D information using video from a static consumer camera and a handheld cross line laser projector. Intersections between the individual laser curves and geometric constraints on the relative position of the laser planes are exploited to achieve dense 3D reconstruction. This is possible without any prior knowledge of the movement of the projector. However, inaccurrately extracted laser lines introduce noise in the detected intersection positions and therefore distort the reconstruction result. Furthermore, when scanning objects with specular reflections, such as glossy painted or metalic surfaces, the reflections are often extracted from the camera image as erroneous laser curves. In this paper we investiagte how robust estimates of the parameters of the laser planes can be obtained despite of noisy detections.

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Kuzmin, M. S., and S. A. Rogov. "Spatial light modulator based on liquid-crystal video projector matrix for information processing systems." Optical Memory and Neural Networks 22, no. 4 (October 2013): 261–66. http://dx.doi.org/10.3103/s1060992x13040103.

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Gurney, Jud W. "DICOM to Print, 35-mm Slides, Web, and Video Projector: Tutorial Using Adobe Photoshop." Journal of Thoracic Imaging 17, no. 4 (October 2002): 285–90. http://dx.doi.org/10.1097/00005382-200210000-00005.

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Zhang, Song, and Shing-Tung Yau. "Generic nonsinusoidal phase error correction for three-dimensional shape measurement using a digital video projector." Applied Optics 46, no. 1 (January 1, 2007): 36. http://dx.doi.org/10.1364/ao.46.000036.

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Hardianto, Roki, Sean Marta Efastri, and Eddissyah Putra Pane. "Pelatihan Pembuatan Media Pembelajaran Berbasis Teknologi Untuk Pendidik PAUD Di Kec Bukit Raya Kota Pekanbaru." J-COSCIS : Journal of Computer Science Community Service 2, no. 1 (January 3, 2022): 25–38. http://dx.doi.org/10.31849/jcoscis.v2i1.8026.

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Kegiatan Pengabdian Kepada Masyarakat dilaksanakan kepada Pendidik PAUD di Kecamatan Bukit Raya Kota Pekanbaru. Materi pelatihan yang diberikan pengetahuan teknologi dibidang Pendidikan Anak Usia Dini (PAUD). Apalagi dibanyak temuan dilapangan banyak guru / tenaga pendidik PAUD yang masih belum pendidikan sarjana, jika sudah pendidikan sarjana tetapi bukan dari lulusan sarjana PAUD. Teknologi disini bisa dimanfaatkan pada saat proses pembelajaran kepada peserta didik seperti dalam membuat media pembelajaran menggunakan media digital yang ditampilkan menggunakan projector, membuat video animasi pembelajaran atau video pembelajaran kreatif dan inovatif. Pendidik dikenalkan cara membuat slide presentasi yang dapat meningkatkan kemauan belajar anak. Luaran dari kegiatan ini adalah jurnal ilmiah yang dipublikasi, berita kegiatan yang dimuat / publikasi pada media massa online, modul ajar sebagai pegangan bagi tenaga pendidik. Dimasa pandemic, kegiatan dilaksanakan secara daring atau luring dengan menerapkan protokol kesehatan yang berlaku.

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Andriolo, Umberto, Elena Sánchez-García, and Rui Taborda. "Operational Use of Surfcam Online Streaming Images for Coastal Morphodynamic Studies." Remote Sensing 11, no. 1 (January 4, 2019): 78. http://dx.doi.org/10.3390/rs11010078.

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Coastal video monitoring has been proven to be a valuable shore-based remote-sensing technique to study coastal processes, as it offers the possibility of high-frequency, continuous and autonomous observations of the coastal area. However, the installation of a video systems infrastructure requires economical and technical efforts, along with being often limited by logistical constraints. This study presents methodological approaches to exploit “surfcam” internet streamed images for quantitative scientific studies. Two different methodologies to collect the required ground control points (GCPs), both during fieldwork and using web tools freely available are presented, in order to establish a rigorous geometric connection between terrestrial and image spaces. The application of an image projector tool allowed the estimation of the unknown camera parameters necessary to georectify the online streamed images. Three photogrammetric procedures are shown, distinct both in the design of the computational steps and in number of GCPs available to solve the spatial resection system. Results showed the feasibility of the methodologies to generate accurate rectified planar images, with the best horizontal projection accuracy of 1.3 m compatible with that required for a quantitative analysis of coastal processes. The presented methodologies can turn “surfcam” infrastructures and any online streaming beach cam, into fully remote shore-based observational systems, fostering the use of these freely available images for the study of nearshore morphodynamics.

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Shu, Guangqiang, and Tao Lin. "The Finger-Based Interactive Projection using a Monocular Camera." International Journal of Pattern Recognition and Artificial Intelligence 33, no. 14 (May 8, 2019): 1954034. http://dx.doi.org/10.1142/s021800141954034x.

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Ordinary projection screen is not sensitive to interaction, it cannot meet the demands of teaching, virtual reality, and other applications. Due to the fact that people always use hands to complete a variety of human–computer interaction, the finger-based interactive projection technology is worth being researched. In this paper, an ordinary monocular camera is used to acquire video frame on projection screen, and the touch signal of finger in frame is used as the input of interactive projection system. Because the differences between spatial frequency of common digital camera and the projection screen is small, the frame obtained from camera will contain moire fringe, which needs to be filtered in image frequency domain. Then the difference between current frame edge and previous frame edge is calculated to obtain moving object edge clues. According to these clues, the most possible contour curve is searched in current frame edge, and the curve is fitted by polynomial approximation method. Its curvature integration is used to match with the curvature integration of finger template curve. After that the fingers in the curve are recognized. Because color information is not needed, this method can be used to recognize gloved fingers. Finally, finger shadow is used to judge whether the finger touches projection screen to complete interactive process. The experiments of writing and collaboratively rotating picture on projector screen show that this method can effectively complete interactive operation with the projection screen and can realize the multi-user operation.

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Teipen, Brian T., and Duncan L. MacFarlane. "Liquid-crystal-display projector-based modulation transfer function measurements of charge-coupled-device video camera systems." Applied Optics 39, no. 4 (February 1, 2000): 515. http://dx.doi.org/10.1364/ao.39.000515.

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Bauer, F., and R. Hörmanseder. "Connecting an IBM enhanced graphics adapter (EGA) to a video projector (Sony VPH-722QM/VPH-1020QM)." Journal of Microcomputer Applications 11, no. 1 (January 1988): 47–56. http://dx.doi.org/10.1016/0745-7138(88)90023-1.

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46

Amirullah, Mohammad Yaqin, Nuzul Hikmah, and Ary Analisa Rahma. "Rancang Bangun Aplikasi Media Pembelajaran Perakitan dan Perawatan pada Sistem Komputer Berbasis Android." JTIM : Jurnal Teknologi Informasi dan Multimedia 2, no. 2 (August 24, 2020): 116–24. http://dx.doi.org/10.35746/jtim.v2i2.90.

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Teaching and learning is basically a process of educational interaction between teacher and student. Learning media become a very important part of the learning process. Therefore it is necessary to find an attractive learning media for students one of them is interactive learning media. Computer learning is one of the basic competency standards taught to students in vocational high schools. Based on observations at the Vocational High School Zainul Hasan Genggong Genggong with the speaker Mr. Mohammad Saleh, S.Kom as a teacher in the Vocational Basic Computer and Network Engineering, he said that the teacher still uses the delivery of material by whiteboard and also uses projector presentation aids using the projector power point slides especially the Vocational Basic Computer and Network Engineering lessons. Therefore it is necessary to find an attractive learning media for students one of them is interactive learning media. Interactive learning media has several elements such as text, audio, video and images, so that it is more interesting to students and students feel happy in learning compared to the way that is still very conventional. The research method used is research development with the stages of study of literature, observation, data collection, system analysis, system design, application implementation, application testing. For the implementation stage, an application has been made as a learning medium that can be accessed using an Android smartphone with a user friendly display, including pictures and videos. Based on the results of testing using blackbox testing and testing in various android platforms learning applications run well in accordance with the results expected by the user.

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Ricke, J., L. Kleinholz, N. Hosten, W. Zendel, A. Lemke, W. Wielgus, K. H. Vöge, E. Fleck, R. Marciniak, and R. Felix. "Telemedicine in Rural Areas. Experience with Medical Desktop-Conferencing via Satellite." Journal of Telemedicine and Telecare 1, no. 4 (December 1995): 224–28. http://dx.doi.org/10.1177/1357633x9500100406.

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Cooperation between physicians in hospitals in rural areas can be assisted by desktop-conferencing using a satellite link. For six weeks, medical desktop-conferencing was tested during daily clinical conferences between the Virchow-Klinikum, Berlin, and the Medical Academy, Wroclaw. The communications link was provided by the German Telekom satellite system MCS, which allowed temporary connections to be established on demand by manual dialling. Standard hardware and software were used for videoconferencing, as well as software for medical communication developed in the BERMED project. Digital data, such as computed tomography or magnetic resonance images, were transmitted by a digital data channel in parallel to the transmission of analogue video and audio signals. For conferences involving large groups of people, hardware modifications were required. These included the installation of a video projector, adaptation of the audio system with improved echo cancellation, and installation of extra microphones. Learning to use an unfamiliar communication medium proved to be uncomplicated for the participating physicians.

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Briant, C. L., and Bernard P. Bewlay. "The Coolidge Process for Making Tungsten Ductile: The Foundation of Incandescent Lighting." MRS Bulletin 20, no. 8 (August 1995): 67–73. http://dx.doi.org/10.1557/s0883769400045164.

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Try to imagine a world without incandescent lamps. We light our homes with 20-200-watt lamps, which are routinely purchased in local stores. These lamps are made at the rate of millions per week and their manufacture represents a large global industry. The consumer expects them to last approximately 1,000 hours and to be energy efficient and inexpensive.Many types of incandescent lamps exist. Figure 1 shows several examples. The most common types are A-line (the general household lamp), automotive lamps, and reflector lamps for floodlight or projector applications. We also have many thousands of specialty lamps, which have a broad range of applications, such as audio-visual projectors, fiberoptic systems, video-camera lights, airport-runway markers, photoprinters, medical/scientific instruments, and stage/studio systems. They can have power ratings from a few watts to several thousand watts, but they all have at least one feature in common. They contain a filament made of tungsten wire. The diameter of the wire will vary, depending on the power rating and application of the lamp, but for most common household lamps it is less than 100 μm.

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Fakhruddin, Kausar Sadia, El Batawi Hisham, and Mehmet Omer Gorduysus. "Effectiveness of audiovisual distraction eyewear and computerized delivery of anesthesia during pulp therapy of primary molars in phobic child patients." European Journal of Dentistry 09, no. 04 (October 2015): 470–75. http://dx.doi.org/10.4103/1305-7456.172637.

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ABSTRACT Objectives: The aim of this study is to assess the effectiveness of audiovisual distraction technique with video eyewear and computerized delivery system-intrasulcular (CDS-IS) during the application of local anesthetic in phobic pediatric patients undergoing pulp therapy of primary molars. Materials and Methods: This randomized, crossover clinical study includes 60 children, aged between 4 and 7-year-old (31 boys and 29 girls). Children were randomly distributed equally into two groups as A and B. This study involved two treatment sessions of pulp therapy, 1-week apart. During treatment session I, group A had an audiovisual distraction with video eyewear, whereas group B had audiovisual distraction using projector display only without video eyewear. During treatment session II, group A had undergone pulp therapy without video eyewear distraction, whereas group B had the pulp treatment using video eyewear distraction. Each session involved the pulp therapy of equivalent teeth in the opposite sides of the mouth. At each visit scores on the Modified Child Dental Anxiety Scale (MCDAS) (f) were used to evaluate the level of anxiety before treatment. After the procedure, children were instructed to rate their pain during treatment on the Wong Bakers’ faces pain scale. Changes in pulse oximeter and heart rate were recorded in every 10 min. Results: From preoperative treatment session I (with video eyewear) to preoperative treatment session II (without video eyewear) for the MCDAS (f), a significant (P > 0.03) change in the mean anxiety score was observed for group A. Self-reported mean pain score decreases dramatically after treatment sessions’ with video eyewear for both groups. Conclusion: The use of audiovisual distraction with video eyewear and the use of CDS-IS system for anesthetic delivery was demonstrated to be effective in improving children's cooperation, than routine psychological interventions and is, therefore, highly recommended as an effective behavior management technique for long invasive procedures of pulp therapy in young children.

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Sharma, Prateek, V. Ramesh, and Khalid Al Aboud. "PowerPoint presentations (PPP): From A to Z." Our Dermatology Online 13, no. 2 (April 1, 2022): 233–36. http://dx.doi.org/10.7241/ourd.20222.34.

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In the last several decades of the twentieth century, an overhead projector was a great option for giving presentations. One could write the main points on a transparent sheet and project it onto a screen, including drawings and graphs. Alternatively, slides incorporating such information could be projected on a screen with a carousel. The limitations included carrying these and the inability to share or make changes later. The 1990s heralded the era of PowerPoint presentations (PPPs), which have relegated these to history. Toward the end of the second millennium, when the digital mode took over numerous tasks, PPPs became the sine qua non in almost every form of activity. PPPs refer to presentations made with a PowerPoint slideshow projected from a computer. It allows for the systematic presentation of a clinical subject followed by structured feedback from the audience. PPPs carry numerous advantages as it is a condensation of the source material by which the reader may assimilate information in a short time and record it through screenshots and video recording.Some obstacles, however, may limit the delivery of an effective presentation, for instance: Lack of clarity; Not knowing the supervisor’s expectations [1]; Limited data outlining the established standards for effective presentations [2]. This article outlines key points constituting an effective PPP as an efficient mode of skills assessment to promote competency-based medical education.