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Journal articles on the topic 'Multiple light sources'

Author: Grafiati

Published: 4 June 2021

Last updated: 16 February 2022

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1

Kenjo, Yusuke, Ryosuke Suzue, and Shiyuan Yang. "Proposal of Light Curtain System Using a Hemisphere Mirror with Multiple Frequency-modulated Light Sources." Journal of the Institute of Industrial Applications Engineers 2, no. 2 (2014): 74–79. http://dx.doi.org/10.12792/jiiae.2.74.

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2

Gijsenij, A., Rui Lu, and T. Gevers. "Color Constancy for Multiple Light Sources." IEEE Transactions on Image Processing 21, no. 2 (2012): 697–707. http://dx.doi.org/10.1109/tip.2011.2165219.

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3

Han, Jaeduk, Soonyoung Hong, and Moon Gi Kang. "Computational Color Constancy under Multiple Light Sources." Electronic Imaging 2020, no. 10 (2020): 135–1. http://dx.doi.org/10.2352/issn.2470-1173.2020.10.ipas-135.

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Without sunlight, imaging devices typically depend on various artificial light sources. However, scenes captured with the artificial light sources often violate the assumptions employed in color constancy algorithms. These violations of the scenes, such as non-uniformity or multiple light sources, could disturb the computer vision algorithms. In this paper, complex illumination of multiple artificial light sources is decomposed into each illumination by considering the sensor responses and the spectrum of the artificial light sources, and the fundamental color constancy algorithms (e.g., gray-world, gray-edge, etc.) are improved by employing the estimated illumination energy. The proposed method effectively improves the conventional methods, and the results of the proposed algorithms are demonstrated using the images captured under laboratory settings for measuring the accuracy of the color representation.

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4

Dávila, A. "Wavelength scanning interferometry using multiple light sources." Optics Express 24, no. 5 (2016): 5311. http://dx.doi.org/10.1364/oe.24.005311.

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5

Tian, Ying-li, H. T. Tsui, S. Y. Yeung, and Songde Ma. "Shape from shading for multiple light sources." Journal of the Optical Society of America A 16, no. 1 (1999): 36. http://dx.doi.org/10.1364/josaa.16.000036.

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6

Penna, Michael A., and Su-Shing Chen. "Shape-from-shading using multiple light sources." International Journal of Intelligent Systems 1, no. 4 (1986): 263–91. http://dx.doi.org/10.1002/int.4550010404.

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7

Tominaga, Shoji, Keita Hirai, and Takahiko Horiuchi. "Spectral Estimation of Multiple Light Sources based on Highlight Detection." Journal of Imaging Science and Technology 64, no. 5 (2020): 50408–1. http://dx.doi.org/10.2352/j.imagingsci.technol.2020.64.5.050408.

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Abstract The authors discuss the spectral estimation of multiple light sources from image data in a complex illumination environment. An approach is proposed to effectively estimate illuminant spectra and the corresponding light sources based on highlight areas that appear on dielectric object surfaces. First, the authors develop a highlight detection method using two types of convolution filters with Gaussian distributions, center-surround and low-pass filters. This method is available even for white surfaces, and it is independent of object color and of viewing and incidence angles. Second, they present an algorithm for estimating the illuminant spectra from extracted highlight areas. Each specular highlight area has a spectral composition corresponding to only one light source among multiple light sources. The spectral image data are projected onto a two-dimensional subspace, where a linear cluster in pixel distribution is detected for each highlight area. Third, the relative positional relationship between highlight areas among different object surfaces is used to identify the light sources on each surface. The authors develop an algorithm based on probabilistic relaxation labeling. The light source for each highlight and the corresponding spectral-power distribution are determined from the iterative labeling process. Finally, the feasibility of the proposed approach is examined in an experiment using a real complex environment, where dielectric objects are illuminated by multiple light sources of light-emitting diode, fluorescence, and incandescence.

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8

Zhang, Ling, Qingan Yan, Zheng Liu, Hua Zou, and Chunxia Xiao. "Illumination Decomposition for Photograph With Multiple Light Sources." IEEE Transactions on Image Processing 26, no. 9 (2017): 4114–27. http://dx.doi.org/10.1109/tip.2017.2712283.

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9

Morimoto, C. H., D. Koons, A. Amir, and M. Flickner. "Pupil detection and tracking using multiple light sources." Image and Vision Computing 18, no. 4 (2000): 331–35. http://dx.doi.org/10.1016/s0262-8856(99)00053-0.

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10

TAKATO, Keiichiro. "Improvement of the Sheet-light Generation Device Using Rotating Multiple Light Sources." Proceedings of the Fluids engineering conference 2016 (2016): GS22. http://dx.doi.org/10.1299/jsmefed.2016.gs22.

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11

Alexeev, Anton, Grigory Onushkin, Jean-Paul Linnartz, and Genevieve Martin. "Multiple Heat Source Thermal Modeling and Transient Analysis of LEDs." Energies 12, no. 10 (2019): 1860. http://dx.doi.org/10.3390/en12101860.

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Thermal transient testing is widely used for LED characterization, derivation of compact models, and calibration of 3D finite element models. The traditional analysis of transient thermal measurements yields a thermal model for a single heat source. However, it appears that secondary heat sources are typically present in LED packages and significantly limit the model’s precision. In this paper, we reveal inaccuracies of thermal transient measurements interpretation associated with the secondary heat sources related to the light trapped in an optical encapsulant and phosphor light conversion losses. We show that both have a significant impact on the transient response for mid-power LED packages. We present a novel methodology of a derivation and calibration of thermal models for LEDs with multiple heat sources. It can be applied not only to monochromatic LEDs but particularly also to LEDs with phosphor light conversion. The methodology enables a separate characterization of the primary pn junction thermal power source and the secondary heat sources in an LED package.

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12

Irikura, Takashi, Tetsuo Taniguchi, and Yoshiro Aoki. "Legibility of Light Signals Composed of Multiple Point Sources." JOURNAL OF THE ILLUMINATING ENGINEERING INSTITUTE OF JAPAN 79, no. 2 (1995): 66–70. http://dx.doi.org/10.2150/jieij1980.79.2_66.

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13

Wu, Xiaofei, Guofan Jin, and Jun Zhu. "Freeform illumination design model for multiple light sources simultaneously." Applied Optics 56, no. 9 (2017): 2405. http://dx.doi.org/10.1364/ao.56.002405.

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14

Kumar, Manoj, Sangeet Srivastava, and Nafees Uddin. "Forgery detection using multiple light sources for synthetic images." Australian Journal of Forensic Sciences 51, no. 3 (2017): 243–50. http://dx.doi.org/10.1080/00450618.2017.1356871.

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15

Batbayar, Densmaa, Nomin-Erdene Dalkhaa, Munkh-Uchral Erdenebat, Nam Kim, and Ganbat Baasantseren. "Point light source display with a large viewing angle using multiple illumination sources." Optical Engineering 56, no. 05 (2017): 1. http://dx.doi.org/10.1117/1.oe.56.5.053113.

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16

Dang, Jian, Jiajun Gao, Zaichen Zhang, et al. "Performance of Optical Mobile Communications with User Mobility and Multiple Light Sources." Wireless Communications and Mobile Computing 2021 (September 13, 2021): 1–14. http://dx.doi.org/10.1155/2021/5573946.

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Optical mobile communication (OMC) is a recently proposed optical wireless communication concept aiming to provide very high-speed data rate optical wireless links for multiple and, in general, distributed mobile users. Previous work analyzed the rate performance of a two-user OMC system without user mobility. This paper extends the rate analysis to multiple users with mobility. The scenario of employing multiple light sources with possible user grouping is also considered. User mobility and multiple light sources lead to new challenges on the system design which are addressed for broadcast downlink communication in this work. Simulations show that user mobility decreases the rate, and the way of how to utilize multiple light sources has great impact on the performance. In particular, simultaneous power division usage of multiple light sources through user grouping and power allocation brings almost no gain as compared with the case of single light source. On the other hand, time division usage of multiple light sources is capable of compensating for the hardware deficiency and thus increasing the rate greatly. It is found that OMC is not only superior to the conventional scheme with nonadjustable channel gains but also outperforms free space optical scheme at high signal-to-noise ratio region.

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17

Carvajal, Joan J. "Light-Emitting Nanofibers Operate as Subwavelength and Multiple Point Sources." MRS Bulletin 32, no. 4 (2007): 303. http://dx.doi.org/10.1557/mrs2007.223.

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18

Maik, Vivek, Joonki Paik, Dohee Cho, and Dongwhan Har. "Color Correction for Multiple Light Sources Using Profile Correction System." Journal of Imaging Science and Technology 53, no. 5 (2009): 050501. http://dx.doi.org/10.2352/j.imagingsci.technol.2009.53.5.050501.

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19

Fang, Fang, Kaushik Dutta, and Anindya Datta. "Domain Adaptation for Sentiment Classification in Light of Multiple Sources." INFORMS Journal on Computing 26, no. 3 (2014): 586–98. http://dx.doi.org/10.1287/ijoc.2013.0585.

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20

Ikeda, Hiroaki, and Yasuhiko Higaki. "Color Scanners with Multiple Light Sources and Optimum Color Design." Journal of the Institute of Television Engineers of Japan 47, no. 6 (1993): 876–80. http://dx.doi.org/10.3169/itej1978.47.876.

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21

Yahya, M. F., and M. R. Arshad. "Tracking of Multiple Light Sources Using Computer Vision for Underwater Docking." Procedia Computer Science 76 (2015): 192–97. http://dx.doi.org/10.1016/j.procs.2015.12.339.

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22

Zhou, Zhiyuan, Zhuang Feng, Jilong Liu, and Shijie Hao. "Single-image low-light enhancement via generating and fusing multiple sources." Neural Computing and Applications 32, no. 11 (2018): 6455–65. http://dx.doi.org/10.1007/s00521-018-3893-3.

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23

Xu, Chao, Hua Li, and Cheng Han. "Estimation of Position and Intensity of Multi-Light Sources Based on Specular Sphere." Journal of Advanced Computational Intelligence and Intelligent Informatics 22, no. 4 (2018): 491–97. http://dx.doi.org/10.20965/jaciii.2018.p0491.

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Illumination estimation is an important research content in mixed reality technology. This paper presents a novel method for locating multiple point light sources and estimating their intensities from the images of a pair of reference spheres. In our approach, no prior knowledge of the location of the sphere is necessary, and the center of the sphere can be uniquely identified with the known radius. The sphere surface is assumed to have both Lambertian and specular properties instead of being a pure Lambertian or specular surface, which guarantees a higher accuracy than the existing approaches. The position estimations of multiple light sources are based on the fact that the specular reflection is highly dependent on highlights. One sphere is utilized to determine the directions of the light sources, and two spheres are used to locate the positions. The images of reference spheres are sampled and partitioned with multiple light sources in different positions. An illumination model is used to calculate the intensities of the ambient light and multiple light sources. Experiments on both simulation and synthetic images show that this method is feasible and accurate for estimating the positions and intensities of the multiple light sources.

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24

Irtel, H. "Surface Colour Matching under Conditions of Multiple Illuminants." Perception 26, no. 1_suppl (1997): 190. http://dx.doi.org/10.1068/v970327.

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Most theories of colour constancy assume a flat coloured surface and a single homogenous light source. Natural situations, however, are 3-dimensional (3-D), are hardly ever restricted to a single light source, and object illumination is never homogenous. Here, two special cases of secondary light sources with sharp boundaries were simulated on a computer screen: a house-like 3-D object with colour patches in sunlight and shadow, and a Mondrian-type pattern with a coloured transparency covering some of the colour patches. Subjects made ‘paper’-matches between colour patches in light and shadow and between patches under the transparency and without the transparency. Matching did not depend on whether the simulated lighting condition was natural (yellow light, blue shadow) or artificial (green light, magenta shadow). Patches under a coloured transparency produced lightness constancy but subjects could not discount chromaticity shifts induced by the transparency. The number of context patches (2 vs 6) made no difference, and it made no difference whether the transparency covered the Mondrian completely or only partially. These results indicate that subjects were not able to use local contrast cues at sharp illumination boundaries to discount for the illuminant.

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25

Kao, Sheng-Liang, and Chiou-Shann Fuh. "Near Point Light Sources for Shape from Shading." International Journal of Pattern Recognition and Artificial Intelligence 12, no. 07 (1998): 951–68. http://dx.doi.org/10.1142/s021800149800052x.

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In this paper, a linear algorithm3,4 is proposed to recover shape information from multiple images, each of them is taken under the environment that all of the object surfaces are illuminated by a known near point light source. In this method, an approximate range of the distance for the objects to the viewer (e.g. camera) is previously defined. Using this predefined value, the absolute depth map of the objects can be found out.

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26

Dai, Pang Da, Yu Jun Zhang, Jing Li Wang, Chang Hua Lu, Yi Zhou, and Jing Liu. "Research on Algorithm of Vision-Based Night Visibility Estimation." Applied Mechanics and Materials 394 (September 2013): 566–70. http://dx.doi.org/10.4028/www.scientific.net/amm.394.566.

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Accurately achieve the luminance of light sources at night images is significantly important to vision-based night visibility estimation. In this paper, we propose a practical night visibility algorithm. This algorithm contains two main parts, light sources recognition and edge extraction. Firstly, we give the model of vision-based visibility estimation, and propose the framework of algorithm. Secondly, we give the method to extract light sources from multiple potential targets by the prior knowledge of space information. Then, we analysis the features of light source image, and explain the expanded temple to cut sub-image of light source, and induce in PS level set to segment the edge. Experiments show that, the light source average recognition precision is approach to 0.95 at the condition of moderate breeze, and compared with the manual segment, the precision of light source segment is approach to 0.99 at the condition of real visibility larger than 500m.

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27

Van Giel, Bart. "Using a fly’s eye integrator in efficient illumination engines with multiple light-emitting diode light sources." Optical Engineering 46, no. 4 (2007): 043001. http://dx.doi.org/10.1117/1.2727313.

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28

Wang, Yang, and Dimitris Samaras. "Estimation of multiple directional light sources for synthesis of augmented reality images." Graphical Models 65, no. 4 (2003): 185–205. http://dx.doi.org/10.1016/s1524-0703(03)00043-2.

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29

Wu, Zi-Yang, Yu-Liang Gao, Ze-Kun Wang, et al. "Optimized DFT-spread OFDM based visible light communications with multiple lighting sources." Optics Express 25, no. 22 (2017): 26468. http://dx.doi.org/10.1364/oe.25.026468.

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30

Dickey, Dwayne J., Kevin Partridge, Ronald B. Moore, and John Tulip. "Light dosimetry for multiple cylindrical diffusing sources for use in photodynamic therapy." Physics in Medicine and Biology 49, no. 14 (2004): 3197–208. http://dx.doi.org/10.1088/0031-9155/49/14/013.

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31

Teipel, J�rn, Diana T�rke, Harald Giessen, Andreas Zintl, and Bernd Braun. "Compact multi-Watt picosecond coherent white light sources using multiple-taper fibers." Optics Express 13, no. 5 (2005): 1734. http://dx.doi.org/10.1364/opex.13.001734.

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32

KORETSUNE, Hiroshi, and Hiroyuki UKIDA. "1215 Shape Reconstruction Method Using Image Scanner with Multiple White Light Sources." Proceedings of Conference of Chugoku-Shikoku Branch 2007.45 (2007): 475–76. http://dx.doi.org/10.1299/jsmecs.2007.45.475.

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33

Schowengerdt, Brian T., and Eric J. Seibel. "True 3-D scanned voxel displays using single or multiple light sources." Journal of the Society for Information Display 14, no. 2 (2006): 135. http://dx.doi.org/10.1889/1.2176115.

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34

Friedmann, Daniel P., Mitchel P. Goldman, Sabrina G. Fabi, and Isabella Guiha. "Multiple sequential light and laser sources to activate aminolevulinic acid for rosacea." Journal of Cosmetic Dermatology 15, no. 4 (2016): 407–12. http://dx.doi.org/10.1111/jocd.12231.

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35

Lagger, Pascal, and Pascal Fua. "Retrieving multiple light sources in the presence of specular reflections and texture." Computer Vision and Image Understanding 111, no. 2 (2008): 207–18. http://dx.doi.org/10.1016/j.cviu.2007.11.002.

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36

Valencia-Estrada, Juan Camilo, Bastien Bechadergue, and Jorge Garcia-Marquez. "Full Field Radiant Flux Distribution of Multiple Tilted Flat Lambertian Light Sources." IEEE Open Journal of the Communications Society 1 (2020): 927–42. http://dx.doi.org/10.1109/ojcoms.2020.3008989.

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37

Nahm, Walter K., Lisa K. Chipps, David A. Wrone, et al. "Comparison of Patients' Assessments on Overall Facial Rejuvenation and Procedural Pain Seen with a Fluorescent Pulsed-Light Source and Those Seen with a Traditional Intense Pulsed-Light Source." American Journal of Cosmetic Surgery 22, no. 2 (2005): 119–22. http://dx.doi.org/10.1177/074880680502200206.

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Introduction: Intense pulsed-light (IPL) treatments are effective alternatives to ablative procedures for improving the appearance of photodamaged skin. Currently, there are multiple IPL sources to modulate photoaged skin, but there are no studies comparing the efficacy of or pain associated with 2 different PL sources. Therefore, we chose to compare patients' assessments of overall cutaneous rejuvenation and pain associated with a fluorescent PL source and a traditional IPL source. Materials and Methods: We performed a retrospective analysis of 24 patients who were treated with both a fluorescent PL source and a traditional IPL source. These patients completed questionnaire surveys that assessed (by a graded scale) pain during the procedure and overall satisfaction with each IPL source. The Wilcoxon signed-rank test for paired data as well as McNemar's test were used to compare overall facial rejuvenation and procedural pain between the 2 light sources. Results: For both light sources, most patients reported “fair” or better improvement in skin appearance. The patients did not report a significant difference in overall skin improvement between the treatments with each light source. In addition, most patients did not report having pain during recovery after procedures by either light source. However, patients did report significantly less pain during treatments with the fluorescent device compared with the traditional IPL source. Discussion: IPL sources provide safe and effective nonablative treatment for facial photorejuvenation. Patients are equally satisfied with the effects seen with both traditional and fluorescent PL source, but reported less pain with the fluorescent PL procedure during treatments.

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38

OHARA, Joji, Takashi HARADA, and Hiroyuki UKIDA. "711 3D Object Shape, Color and Specular Component Reconstruction and Optimal Light Source Positions Estimation Using Image Scanner with Multiple Light Sources." Proceedings of Conference of Chugoku-Shikoku Branch 2012.50 (2012): 71101–2. http://dx.doi.org/10.1299/jsmecs.2012.50.71101.

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39

Ye, Zhi Ting, Yuan Heng Cheng, Ku Huan Liu, and Kai Shiang Yang. "Mini-LEDs with Diffuse Reflection Cavity Arrays and Quantum Dot Film for Thin, Large-Area, High-Luminance Flat Light Source." Nanomaterials 11, no. 9 (2021): 2395. http://dx.doi.org/10.3390/nano11092395.

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Mini-light-emitting diodes (mini-LEDs) were combined with multiple three-dimensional (3D) diffuse reflection cavity arrays (DRCAs) to produce thin, large-area, high-brightness, flat light source modules. The curvature of the 3D free-form DRCA was optimized to control its light path; this increased the distance between light sources and reduced the number of light sources used. Experiments with a 12.3-inch prototype indicated that 216 mini-LEDs were required for a 6 mm optical mixing distance to achieve a thin, large-area surface with high brightness, uniformity, and color saturation of 23,044 cd/m2, 90.13%, and 119.2, respectively. This module can serve as the local dimming backlight in next generation automotive displays.

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40

Tikhonov, E., Vasil P. Yashchuk, O. Prygodjuk, and V. Bezrodny. "Multiple Scattering Active Media as Small-Size Frequency Tunable Sources of Stimulated Emission." Solid State Phenomena 99-100 (July 2004): 77–82. http://dx.doi.org/10.4028/www.scientific.net/ssp.99-100.77.

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We investigated the lasing spectra of multiple scattering active media based on solid polymer solutions of rhodamin 6G with embedded scattering silica particles of mean diameter 500nm. Lasing in these samples appears without any cavity and arises even in rather small active volume 0.05*0.5*0.5mm3. In a thick sample positive feedback for lasing is provided mainly by multiple scattering of light. In a thin sample the feedback is provided both by multiple scattering of light on the particles and light reflection from the sample surface. It is found that the lasing spectra peak wavelength can be varied within 13nm by varying sample thickness in a range 0.1 -1.65mm. A method of continuos laser tuning by wedge-like sample shift with respect to the pump beam is proposed. The presented results are aimed at the development of a new type of microlaser.

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41

Ma, Boqin, Baoqin Chen, Rongjuan Liu, and Zhiyuan Li. "Multiple shape light sources generated in LiNbO3nonlinear photonic crystals with Sierpinski fractal superlattices." Journal of Optics 17, no. 8 (2015): 085503. http://dx.doi.org/10.1088/2040-8978/17/8/085503.

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42

Morgand, Alexandre, Mohamed Tamaazousti, and Adrien Bartoli. "A Geometric Model for Specularity Prediction on Planar Surfaces with Multiple Light Sources." IEEE Transactions on Visualization and Computer Graphics 24, no. 5 (2018): 1691–704. http://dx.doi.org/10.1109/tvcg.2017.2677445.

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43

Kudo, K., T. Morimoto, K. Yashiki, et al. "Wavelength-selectable microarray light sources of multiple ranges simultaneously fabricated on single wafer." Electronics Letters 36, no. 8 (2000): 745. http://dx.doi.org/10.1049/el:20000565.

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44

Farley, Joseph, Joel Cavallo, Brent Hallahan, and Jeff Johnson. "Multiple Sources of Light-Evoked Intracellular Calcium Increases in Hermissenda Type B Photoreceptors." Biophysical Journal 96, no. 3 (2009): 119a. http://dx.doi.org/10.1016/j.bpj.2008.12.528.

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45

Kim, HyungTae, KyeongYong Cho, SeungTaek Kim, Jongseok Kim, and KyungChan Jin. "Quick light mixing of multiple color sources for image acquisition using pattern search." International Journal of Precision Engineering and Manufacturing 16, no. 11 (2015): 2353–58. http://dx.doi.org/10.1007/s12541-015-0303-y.

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46

Morimoto, Carlos H., Flávio L. Coutinho, and Dan W. Hansen. "Screen-Light Decomposition Framework for Point-of-Gaze Estimation Using a Single Uncalibrated Camera and Multiple Light Sources." Journal of Mathematical Imaging and Vision 62, no. 4 (2020): 585–605. http://dx.doi.org/10.1007/s10851-020-00947-8.

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47

Stuurman, Nico, Nenad Amdodaj та Ron Vale. "μManager: Open Source Software for Light Microscope Imaging". Microscopy Today 15, № 3 (2007): 42–43. http://dx.doi.org/10.1017/s1551929500055541.

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No longer are biologists content to peer through the oculars of a microscope. Eyes have been replaced by digital cameras. Instead of manual control of microscope stages, filters and light sources, modern microscopes have become fully robotic. Image acquisition and robotic movements require computer control. With such equipment it is possible to automatically record images at multiple wavelengths, carry out time-lapse recordings of living cells using very short exposure times and low light doses, and even to record images at multiple positions (e.g. from a multi-well plate) without operator intervention. Clearly, computer control of light microscope image acquisition is making many new experimental imaging strategies possible in the biological sciences.

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48

Fernández-Guarino, M., A. Harto, and P. Jaén. "Pulsed Dye Laser Does Not Seem as Effective as Red Light in Basal Cell Carcinoma Mal-Pdt: A Small Pilot Study." Journal of Skin Cancer 2012 (2012): 1–3. http://dx.doi.org/10.1155/2012/396481.

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Multiple light sources can be used for photodynamic therapy (PDT) with good results, but there are few comparative studies. This study compares the efficacy of treatment of basal cell carcinoma with PDT and two light sources, the non-coherent red light and pulsed dye laser 595 nm. In this small pilot study red light is more effective, but many more studies are needed to draw definitive conclusions.

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49

Cheveau, Arnold. "3D Scanning Solution for Textured Object using Photometric Stereo with Multiple Known Light Sources." Archiving Conference 2018, no. 1 (2018): 6–9. http://dx.doi.org/10.2352/issn.2168-3204.2018.1.0.3.

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50

LIU, Kuan, and Hiroyuki UKIDA. "1203 3D Shape Reconstruction under Specular Reflection Using Image Scanner with Multiple Light Sources." Proceedings of Conference of Chugoku-Shikoku Branch 2010.48 (2010): 363–64. http://dx.doi.org/10.1299/jsmecs.2010.48.363.

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