Relevant bibliographies by topics / Digitale camera's

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Digitale camera's'

Author: Grafiati
Published: 12 December 2022
Last updated: 26 January 2023

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Journal articles on the topic "Digitale camera's"

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Liu, Ziwei, Feng Lin, Chao Wang, et al. "CamRadar." Proceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies 6, no. 4 (2022): 1–25. http://dx.doi.org/10.1145/3569505.

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Hidden cameras in sensitive locations have become an increasing threat to personal privacy all over the world. Because the camera is small and camouflaged, it is difficult to detect the presence of the camera with naked eyes. Existing works on this subject have either only covered using wireless transmission to detect cameras, or using other methods which are cumbersome in practical use. In this paper, we introduce a new direction that leverages the unintentional electromagnetic (EM) emanations of the camera to detect it. We first find that the digital output of the camera's image sensor will be amplitude-modulated to the EM emanations of the camera's clock. Thus, changes in the scope of the camera will directly cause changes in the camera's EM emanations, which constitutes a unique characteristic for a hidden camera. Based on this, we propose a novel camera detection system named CamRadar, which can filter out potential camera EM emanations from numerous EM signals quickly and achieve accurate hidden camera detection. Benefitting from the camera's EM emanations, CamRadar will not be limited by the camera transmission types or the detection angle. Our extensive real-world experiments using CamRadar and 19 hidden cameras show that CamRadar achieves a fast detection (in 16.75s) with a detection rate of 93.23% as well as a low false positive rate of 3.95%.
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Liu, Chun Feng, Shan Shan Kong, and Hai Ming Wu. "Research on a Single Camera Location Model and its Application." Applied Mechanics and Materials 50-51 (February 2011): 468–72. http://dx.doi.org/10.4028/www.scientific.net/amm.50-51.468.

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Digital cameras have been widely used in the areas of road transportation, railway transportation as well as security system. To address the position of digital camera in these fields this paper proposed a geometry calibration method based on feature point extraction of arbitrary target. Under the meaning of the questions, this paper first defines four kinds of coordinate system, that is the world coordinate system. The camera's optical center of the coordinate system is the camera coordinate system, using the same point in different coordinate system of the coordinate transformation to determine the relationship between world coordinate system and camera coordinate. And thus determine the camera's internal parameters and external parameters, available transformation matrix and translation vector indicated by the camera's internal parameters of the external parameters and the establishment of a single camera location model. According to the model, using the camera's external parameters to be on the target circle center point in the image plane coordinates.
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Zhou, Shichao, Haibin Zhu, Qinwei Ma, and Shaopeng Ma. "Heat Transfer and Temperature Characteristics of a Working Digital Camera." Sensors 20, no. 9 (2020): 2561. http://dx.doi.org/10.3390/s20092561.

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Digital cameras represented by industrial cameras are widely used as image acquisition sensors in the field of image-based mechanics measurement, and their thermal effect inevitably induces thermal-induced errors of the mechanics measurement. To deeply understand the errors, the research for digital camera’s thermal effect is necessary. This study systematically investigated the heat transfer processes and temperature characteristics of a working digital camera. Concretely, based on the temperature distribution of a typical working digital camera, the heat transfer of the working digital camera was investigated, and a model describing the temperature variation and distribution was presented and verified experimentally. With this model, the thermal equilibrium time and thermal equilibrium temperature of the camera system were calculated. Then, the influences of thermal parameters of digital camera and environmental temperature on the temperature characteristics of working digital camera were simulated and experimentally investigated. The theory analysis and experimental results demonstrate that the presented model can accurately describe the temperature characteristics and further calculate the thermal equilibrium state of working digital camera, all of which contribute to guiding mechanics measurement and thermal design based on such camera sensors.
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Bernacki, Jaroslaw. "Digital camera identification based on analysis of optical defects." Multimedia Tools and Applications 79, no. 3-4 (2019): 2945–63. http://dx.doi.org/10.1007/s11042-019-08182-z.

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AbstractIn this paper we deal with the problem of digital camera identification by photographs. Identifying camera is possible by analyzing camera’s sensor artifacts that occur during the process of photo processing. The problem of digital camera identification has been popular for a long time. Recently many effective and robust algorithms for solving this problem have been proposed. However, almost all solutions are based on state-of-the-art algorithm, proposed by Lukás et al. in 2006. Core of this algorithm is to calculate the so-called sensor pattern noise based on denoising images with wavelet-based denoising filter. Such technique is very efficient, but very time consuming. In this paper we consider tracing cameras by analyzing defects of their optical systems, like vignetting and lens distortion. We show that analysis of vignetting defect allows for recognizing brand of the camera. Lens distortion can be used to distinguish images from different cameras. Experimental evaluation was carried out on 60 devices (compact cameras and smartphones) for a total number of 12 051 images, with support of the Dresden Image Database. Proposed methods do not require denoising images with wavelet-based denoising filter what has a significant influence for speed of image processing, compared with state-of-the-art algorithm.
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Burnett, Bryan, and Steven Blaauw. "Macro Imaging with Digital Cameras." Microscopy Today 11, no. 4 (2003): 32–35. http://dx.doi.org/10.1017/s1551929500053050.

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Advances in charged couple device (CCD) design, low cast processor power, cheap memory and dropping prices of digital cameras over the last few years have made the CCD digital camera art attractive alternative to the film camera for many imaging applications. This is especially true in macro imaging where it appears likely that digital cameras will replace film cameras (curiously, Long (2001), says otherwise). As will be described here, a digital camera equipped with a quality macro-zoom lens, generates images with a depth of field (e.g., Fig. 1) that greatly surpass images produced by a film camera with a comparable lens system.
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Ruzgienė, Birutė. "PERFORMANCE EVALUATION OF NON-METRIC DIGITAL CAMERA FOR PHOTOGRAMMETRIC APPLICATION." Geodesy and cartography 31, no. 1 (2012): 23–27. http://dx.doi.org/10.3846/13921541.2005.9636660.

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During the last year amateur low‐cost digital cameras are increasingly expected to contribute to the digital photogrammetry. An important aspect of the suitability of these cameras is determination of their geometrical instability. In order to evaluate amateur digital camera performance, small format, low resolution and low-cost CCD camera have been investigated in two considerations: determining inner orientation parameters at different time and estimating accuracy in test field experiments. The calibration results demonstrate the poor stability of such a digital camera. As a result of the instability, amateur cameras have limited possibilities in close-range photogrammetry. However, the investigated camera under certain limited accuracy requirements can be used for low-accuracy photogrammetric application.
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Evtikhiev, Nickolay N., Alexander V. Kozlov, Vitaly V. Krasnov, Vladislav G. Rodin, Rostislav S. Starikov, and Pavel A. Cheremkhin. "Estimation of efficiency of measurement of digital camera photosensor noise by automatic segmentation of non-uniform target method and the standard EMVA 1288." Izmeritel`naya Tekhnika, no. 4 (2021): 28–35. http://dx.doi.org/10.32446/0368-1025it.2021-4-28-35.

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In this paper important task of estimation of digital camera’s noise parameters is considered. Relation of accuracy of data obtained with digital camera and photosensor noise is discussed. Both standard European machine vision association EMVA 1288 and fast automatic segmentation of non-uniform target (ASNT) noise estimation methods are compared. Noise characteristics of machine vision PixeLink PL-B781F, scientific Retiga R6 and amateur mirrorless Canon EOS M100 cameras have been investigated. Accuracy of measurements, speed of calculation and experimental realization has been analyzed. Accuracy of temporal noise estimation by modified ASNT method is no less than that one for standard EMVA 1288. But the ASNT method can be implemented much faster than the standard EMVA 1288 even with additional frames for accuracy improvement.
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Matus, Vicente, Elizabeth Eso, Shivani Rajendra Teli, Rafael Perez-Jimenez, and Stanislav Zvanovec. "Experimentally Derived Feasibility of Optical Camera Communications under Turbulence and Fog Conditions." Sensors 20, no. 3 (2020): 757. http://dx.doi.org/10.3390/s20030757.

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Optical camera communications (OCC) research field has grown recently, aided by ubiquitous digital cameras; however, atmospheric conditions can restrict their feasibility in outdoor scenarios. In this work, we studied an experimental OCC system under environmental phenomena emulated in a laboratory chamber. We found that the heat-induced turbulence does not affect our system significantly, while the attenuation caused by fog does decrease the signal quality. For this reason, a novel strategy is proposed, using the camera’s built-in amplifier to overcome the optical power loss and to decrease the quantization noise induced by the analog-digital converter of the camera. The signal quality has been evaluated using the Pearson’s correlation coefficient with respect to a reference template signal, along with the signal-to-noise ratio that has been empirically evaluated. The amplification mechanism introduced allows our system to receive the OCC signal under heavy fog by gradually increasing the camera gain up to 16 dB, for meteorological visibility values down to 10 m, with a correlation coefficient of 0.9 with respect to clear conditions.
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Dedei Tagoe, Naa, and S. Mantey. "Determination of the Interior Orientation Parameters of a Non-metric Digital Camera for Terrestrial Photogrammetric Applications." Ghana Mining Journal 19, no. 2 (2019): 1–9. http://dx.doi.org/10.4314/gm.v19i2.1.

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AbstractHigh cost of metric photogrammetric cameras has given rise to the utilisation of non-metric digital cameras to generate photogrammetric products in traditional close range or terrestrial photogrammetric applications. For precision photogrammetric applications, the internal metric characteristics of the camera, customarily known as the Interior Orientation Parameters, need to be determined and analysed. The derivation of these parameters is usually achieved by implementing a bundle adjustment with self-calibration procedure. The stability of the Interior Orientation Parameters is an issue in terms of accuracy in digital cameras since they are not built with photogrammetric applications in mind. This study utilised two photogrammetric software (i.e. Photo Modeler and Australis) to calibrate a non-metric digital camera to determine its Interior Orientation Parameters. The camera parameters were obtained using the two software and the Root Mean Square Errors (RMSE) calculated. It was observed that Australis gave a RMSE of 0.2435 and Photo Modeler gave 0.2335, implying that, the calibrated non-metric digital camera is suitable for high precision terrestrial photogrammetric projects. Keywords: Camera Calibration, Interior Orientation Parameters, Non-Metric Digital Camera
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AL-Baghdadi, Jasim Ahmed Ali, Hassan Ali Alizze, and Kasim Abed AL-Hussein. "Accuracy Assessment of Various Resolutions Digital Cameras For Close Range Photogrammetry Applications." Journal of Engineering 24, no. 9 (2018): 78. http://dx.doi.org/10.31026/j.eng.2018.09.06.

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Due to the great evolution in digital commercial cameras, several studies have addressed the using of such cameras in different civil and close-range applications such as 3D models generation. However, previous studies have not discussed a precise relationship between a camera resolution and the accuracy of the models generated based on images of this camera. Therefore the current study aims to evaluate the accuracy of the derived 3D buildings models captured by different resolution cameras. The digital photogrammetric methods were devoted to derive 3D models using the data of various resolution cameras and analyze their accuracies. This investigation involves selecting three different resolution cameras (low, medium and high) and evaluating their calibration accuracies. Assessing the accuracy of the three selected cameras in capturing indoor and outdoor objects; and analyzing the accuracy and the quality of the produced models. The study revealed that:1) It is recommended to use the photos of a high-resolution camera for producing precise 3D models of objects in the outdoor environment especially when the camera/object distance is more than 40 m because the accuracy of the produced models can be precise (RMSE ±10.36mm) with excellent quality; 2) The Low-resolution camera can be utilised to produce adequate 3D models of object in the indoor environment (RMSE ±6.32mm) especially when the camera/object distance is less than 40 m.
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Dissertations / Theses on the topic "Digitale camera's"

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Chichagov, Alexander. "Digital elevation modeling using digital frame cameras." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0021/MQ48381.pdf.

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Chichagov, Alexander Carleton University Dissertation Geography. "Digital elevation modeling using digital frame cameras." Ottawa, 1999.

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Solli, Martin. "Filter characterization in digital cameras." Thesis, Linköping University, Department of Science and Technology, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2667.

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The use of spectrophotometers for color measurements on printed substrates is widely spread among paper producers as well as within the printing industry. Spectrophotometer measurements are precise, but time-consuming procedures and faster methods are desirable. Previously presented work on color calibration of flatbed scanners has shown that they can be used for fast color measurements with acceptable results. Furthermore, the rapid development of digital cameras has made it possible to transfer the methods to a camera-based system, and in this work a moderately priced consumer digital camera is used for color measurements.

Earlier presented methods for color calibration have been implemented in the camera-based system and new modifications that can improve their performance are proposed. Moreover, if the spectral sensitivities of the color filters in the camera sensor can be characterized, this can further improve the performance of the color measurements. Two methods for characterization of the color filters are presented in this work together with methods that use the camera characteristics for color measurements.

The findings of this work show that a consumer digital camera can be used as a fast and inexpensive alternative to spectrophotometers for color measurements on printed substrates.

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Marlow, Gregory. "Week 03, Video 03: Camera." Digital Commons @ East Tennessee State University, 2020. https://dc.etsu.edu/digital-animation-videos-oer/26.

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Chou, Ti-Fan. "Obtaining reflectance functions using digital cameras." Thesis, University of Leeds, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.634750.

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Spectral reflectance is the 'finger print' of the colour of an object. This study investigated a number of the methods to obtain spectral reflectance functions of colours, and to compare their performance. Spectrophotometers are traditionally colour measurement instruments. However, they can only measure one spot of flat uniform colour patches with direct contact. Using digital cameras as a means of colour measurement device to predict spectral reflectance can overcome this limitation, but system performance in terms of accuracy and precision is expected to be lower than using spectrophotometers. In the present work, the metrology and prediction of measuring colours were studied. The former included the evaluation of spectrophotometer performance. The latter considered characterisation models using digital cameras to predict spectral reflectance from camera responses. Large efforts were spent to develop camera based technology. The characterisation model which was typically applied to transform the camera primary responses to device independent primaries (XYZ or CIELAB) requires a characterisation target. To make a successful model depends upon the selection of effective colours in the characterisation target. In the present research, a method for developing the characterisation target and the importance of colour regions for colour selection were proposed.
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Van, der Merwe Willem Johannes. "Rapid 3D measurement using digital video cameras." Thesis, Link to the online version, 2008. http://hdl.handle.net/10019/915.

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Wackrow, Rene. "Spatial measurement with consumer grade digital cameras." Thesis, Loughborough University, 2008. https://dspace.lboro.ac.uk/2134/3827.

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Nagdev, Alok. "Georeferencing digital camera images using internal camera model." [Tampa, Fla.] : University of South Florida, 2004. http://purl.fcla.edu/fcla/etd/SFE0000343.

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Smith, Jeffrey Statler. "Multi-camera: interactive rendering of abstract digital images." Thesis, Texas A&M University, 2003. http://hdl.handle.net/1969.1/341.

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The purpose of this thesis is the development of an interactive computer-generated rendering system that provides artists with the ability to create abstract paintings simply and intuitively. This system allows the user to distort a computer-generated environment using image manipulation techniques that are derived from fundamentals of expressionistic art. The primary method by which these images will be abstracted stems from the idea of several small images assembled into a collage that represents multiple viewing points rendered simultaneously. This idea has its roots in the multiple-perspective and collage techniques used by many cubist and futurist artists of the early twentieth century.
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Scraggs, David Peter Thomas. "Digital signal processing techniques for semiconductor Compton cameras." Thesis, University of Liverpool, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.491364.

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The work presented in this thesis has focused on the development of a low dose Compton camera for nuclear medicine. A Compton camera composed of two high-purity planar germanium orthogonal-strip detectors has been constructed. Fast digital data acquisition has been utilised for the application of pulse shape analysis techniques. A simple back projection imaging code has been developed and validated with a Geant4 radiation transport simulation of the Compton camera configuration. L A 137CS isotropic source and a 22Na anisotropic source have been experimentally reconstructed. Parametric pulse shape analysis was applied to both data sets and has been shown to increase the detector spatial resolution from a raw granularity of 5x5x20mm to a spatial resolution that can be represented by a Gaussian distribution with a standard deviation of 1.5mm < u < 2mm in all dimensions; this result was in-part derived from Geant4 simulations. Qualitatively poor images have been shown to result - based wholly on simulation - from Gaussian spatial-resolution distributions that have a standard deviation of greater than 4mm. A partial experimental basis-data-set has been developed and proved capable of providing 1.9mm FWHM average spatial resolution through the depth axis of a single detector crystal. A novel technique to identify gamma ray scattering within single detector c1osed-face-pixels - hitherto unrecognised - has also been introduced in this thesis. This technique, henceforth known as Digital Compton Suppression (DieS), is based on spectral analysis and has demonstrated the ability of identifying events in which the Compton scattering and photoelectric absorption sites are separated by 13mm in the direction ofthe electric field. Supplied by The British Library - 'The world's knowledge'
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Books on the topic "Digitale camera's"

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Ron, Bezemer, ed. Fotograferen met je mobieltje. Elmar, 2006.

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Sheppard, Rob. Canon EOS Digital Rebel, EOS 300D Digital. Lark Books, 2004.

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Sheppard, Rob. Canon EOS Digital Rebel, EOS 300D Digital. Lark Books, 2004.

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Stephen, Gregory. Learn the Canon EOS digital Rebel camera for 5 bucks! Fair Shake Press, 2005.

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Doug, Sahlin, ed. Nikon D5000 for dummies. Wiley Publishing, 2009.

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Revell, Jeff. Nikon D5000: From snapshots to great shots. Peachpit, 2010.

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Magic lantern guides: Canon EOS Digital Rebel XS EOS 1000D. Lark Books, 2008.

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Magic lantern guides: Pentax K200D. Lark Books, 2008.

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Guncheon, Michael A. Magic lantern guides: Canon EOS Rebel XSi, EOS 450D. Lark Books, 2008.

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Christopher, Adam. Canon EOS-1D Mark II, EOS-1Ds Mark II. Lark Books, 2005.

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Book chapters on the topic "Digitale camera's"

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Wolf, Marilyn. "Digital Photography." In Smart Camera Design. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-69523-5_1.

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Wilson, Kevin. "Uploading from Digital Cameras." In Everyday Computing with Windows 8.1. Apress, 2014. http://dx.doi.org/10.1007/978-1-4842-0805-2_18.

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Moody, James L., and Jeff Ravitz. "Digital Cameras and Projectors." In Lighting for Televised Live Events. Routledge, 2021. http://dx.doi.org/10.4324/9780429288982-15.

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Stump, David. "Camera Issues." In Digital Cinematography, 2nd ed. Routledge, 2021. http://dx.doi.org/10.4324/9780429468858-8.

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Stump, David. "High Resolution Digital Motion Picture Cameras." In Digital Cinematography, 2nd ed. Routledge, 2021. http://dx.doi.org/10.4324/9780429468858-9.

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Sandau, Rainer. "Introduction." In Digital Airborne Camera. Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-1-4020-8878-0_1.

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Sandau, Rainer. "Foundations and Definitions." In Digital Airborne Camera. Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-1-4020-8878-0_2.

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Sandau, Rainer. "The Imaged Object and the Atmosphere." In Digital Airborne Camera. Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-1-4020-8878-0_3.

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Sandau, Rainer. "Structure of a Digital Airborne Camera." In Digital Airborne Camera. Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-1-4020-8878-0_4.

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Sandau, Rainer. "Calibration." In Digital Airborne Camera. Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-1-4020-8878-0_5.

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Conference papers on the topic "Digitale camera's"

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Yellowhair, Julius, and Clifford K. Ho. "On-Sun Evaluation of the PHLUX Method for Heliostat Beam Characterization." In ASME 2016 10th International Conference on Energy Sustainability collocated with the ASME 2016 Power Conference and the ASME 2016 14th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/es2016-59409.

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Flux distributions from solar field collectors are typically evaluated using a beam characterization system, which consists of a digital camera with neutral density filters, flux gauge or calorimeter, and water-cooled Lambertian target panel. The pixels in camera image of the flux distribution are scaled by the flux peak value measured with the flux gauge or the total power value measured with the calorimeter. An alternative method, called PHLUX developed at Sandia National Laboratories, can serve the same purpose using a digital camera but without auxiliary instrumentation. The only additional information required besides the digital images recorded from the camera are the direct normal irradiance, an image of the sun using the same camera, and the reflectivity of the receiver or target panel surface. The PHLUX method was evaluated using two digital cameras (Nikon D90 and D3300) at different flux levels on a target panel. The performances of the two cameras were compared to each other and to measurements from a Kendall radiometer. For consistency in comparison of the two cameras, the same focal length lenses and same number of neutral density filters were used. Other camera settings (e.g., shutter speed, f-stop, etc.) were set based on the aperture size and performance of the cameras. The Nikon D3300 has twice the number of pixels as the D90. D3300 provided higher resolution, however, due to the smaller pixel sizes the images were noisier, and the D90 with larger pixels had better response to low light levels. The noise in the D3300, if not corrected, could result in gross overestimation of the irradiance calculations. After corrections to the D3300 flux images, the PHLUX results from the two cameras showed they agreed to within 8% for a peak flux level of 1000 suns on the target, and less than 10% error in the peak flux when compared to the Kendall radiometer.
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McAdam, Christopher, Craig Pinkerton, and Stephen A. Brewster. "Novel interfaces for digital cameras and camera phones." In the 12th international conference. ACM Press, 2010. http://dx.doi.org/10.1145/1851600.1851625.

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Souza, Marcos Roberto, and Helio Pedrini. "Digital Video Stabilization: Algorithms and Evaluation." In XXXII Conference on Graphics, Patterns and Images. Sociedade Brasileira de Computação - SBC, 2019. http://dx.doi.org/10.5753/sibgrapi.est.2019.8299.

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Several devices have allowed the acquisition and editing of videos in various circumstances, such as digital cameras, smartphones and other mobile devices. However, the use of cameras under adverse conditions usually results in non-precise motion and occurrence of shaking, which may compromise the stability of the obtained videos. To overcome such problem, digital stabilization aims to correct camera motion oscillations that occur in the acquisition process, particularly when the cameras are mobile and handled in adverse conditions, through software techniques - without the use of specific hardware - to enhance visual quality either with the intention of enhancing human perception or improving final applications, such as detection and tracking of objects. This is important in order to avoid hardware cost and indispensable for videos already recorded. This work proposed three methods to perform digital video stabilization and two other techniques to evaluate video stabilization quality.
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Hau Wah LAI, Terry. "Calibration of the Frame Rate of High Speed Digital Video Recorders by Stationary Counting Method: Application of the Stroboscopic Effect." In NCSL International Workshop & Symposium. NCSL International, 2017. http://dx.doi.org/10.51843/wsproceedings.2017.46.

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By applying the characteristic of stroboscopic effect, a new method named Stationary Counting Method for the calibration of the frame rate of digital video recorder has been developed at the Hong Kong Standards and Calibration Laboratory(SCL). The proposed method can determine the frame rate of digital video recorders with the use of a special synchronous counter designed by the SCL. The frequency signal input to the counter is traceable to the Cesium Beam Frequency Standard kept in SCL, as well as traceable to the SI unit. The target devices include high speed digital cameras, smartphones, closed circuit televisions (CCTV) and car cameras. It is common for vehicles to install car cameras to capture the moment when unexpected incidents occur. The recorded videos can be used as court evidences for accident investigation. Therefore, the accuracy of the frame rate is extremely important. The proposed method can be used to find the time duration of the video recorded by a digital camera, as well as the occurrence of skipped or extra frames of the captured video.
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Molada Tebar, Adolfo, José Luis Lerma, and Ángel Marqués-Mateu. "SOFTWARE DEVELOPMENT FOR COLOURIMETRIC AND SPECTRAL DATA PROCESSING: PYCOLOURIMETRY." In 1st Congress in Geomatics Engineering. Universitat Politècnica València, 2017. http://dx.doi.org/10.4995/cigeo2017.2017.6568.

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Archaeological documentation is a complex process where the technical measurement and specification of colour is a key aspect. In the last years heritage documentation processes have largely benefited from the application of digital recording methods, imagery analysis software and technologies that offers great advantages over the traditional methods. The rigorous processing of colourimetric data requires software packages with specific colourimetric technical characteristics. In this paper we report on our in-house pyColourimetry software that was developed and tested taking into account the recommendations of the Commission Internationale de l'Éclairage (CIE). The objective is to apply a rigorous procedure for the characterisation of cameras based a priori on polynomial models. Most of the digital cameras capture colour information in the well-known RGB format, but the signals generated by the digital camera are device dependent. By means of the characterisation we establish the relationship between device dependent RGB values and the tristimulus coordinates defined by the CIE standard colourimetric observer. Once the camera is characterised, users have the potential to obtain output images in the sRGB space that is independent of the sensor of the camera. pyColourimetry software allows users to control the entire digital image processing and the colourimetric data workflow proposed. We applied the methodology on a set of pictures targeting Levantine rock art motifs in Cova dels Cavalls (Castellón, Spain) which is considered part of a UNESCO World Heritage Site. The outcomes obtained are satisfactory and very promising for proper colour documentation in cultural heritage estudies.http://dx.doi.org/10.4995/CIGeo2017.2017.6568
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Souza, Marcos Roberto e., and Helio Pedrini. "Digital Video Stabilization: Algorithms and Evaluation." In XXXII Concurso de Teses e Dissertações da SBC. Sociedade Brasileira de Computação - SBC, 2019. http://dx.doi.org/10.5753/ctd.2019.6338.

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Several devices have allowed the acquisition and editing ofvideos in various circumstances, such as digital cameras, smartphones and other mobile devices. However, the use ofcameras under adverse conditions usually results in non-precise motion and occurrence of shaking, which may compromise the stability of the obtained videos. To overcome such problem, digital stabiliza- tion aims to correct camera motion oscillations that occur in the acquisition process, particularly when the cameras are mobile and handled in adverse con- ditions, through software techniques, without the use of specific hardware, to enhance visual quality either with the intention of enhancing human percep- tion or improving final applications, such as detection and tracking of objects. This is important in order to avoid hardware cost and indispensable for videos already recorded. This work proposed three methods to perform digital video stabilization and two other techniques to evaluate video stabilization quality. 1.
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Wada, Yoshitaka, and Tomonari Furukawa. "Noise Reduction Technique for Digital Image Based Full Field Strain Measurement." In ASME 2012 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/detc2012-70704.

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In recent years several techniques of full-field measurement have been studied by digital image correlation method, moiré interference method and holographic interferometry method and so on. Image based method can be easily applied to large deformation problem and moving specimen at slow speed. Because digital camera capabilities, which are high resolution, low noise and faster data transfer speed, have been improved, very small strain measurement can be achieved by those improvements. The improvement will widen those applications, for example, moving object at high speed and less 0.1% strain measurement which is almost the same accuracy with a precise strain gauge. In order to apply the advanced application, noise reduction for a digital image and lens distortion correction for an optical system should be developed. In this paper we propose noise reduction technique using statistical camera model to be applied to any kinds of digital cameras.
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Lazar, Mihael, and Aleš Hladnik. "Improved reconstruction of the reflectance spectra from RGB readings using two instead of one digital camera." In 11th International Symposium on Graphic Engineering and Design. University of Novi Sad, Faculty of technical sciences, Department of graphic engineering and design, 2022. http://dx.doi.org/10.24867/grid-2022-p96.

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The colour of an observed object can be described in many different manners, and the description by its reflectance provides the unambiguous colour representation. The reflectance description can be acquired by expensive multispectral cameras or, e.g., with time-sequential multispectral illumination. In our experiment, we propose that under the condition of constant and uniform illumination, the reflectance can be deduced from the object's RGB camera readouts, captured alongside the set of colour patches with known spectral characteristics. Translation from a colour description in RGB space into reflectance spectra, independent of illuminant and camera sensor characteristics, was performed with the help of an artificial neural network (ANN). In our study, the hypothesis was proposed that the ANN's performance of reflectance reconstruction can be enhanced by employing richer learning datasets using RGB input sets of two cameras instead of just one. Additional second camera information would be adequate only if the equivalent channels of cameras used are linearly independent. A quantitative measure of nonlinearity (QMoN), which is the metric primarily developed for use in chemistry, was employed to estimate the degree of nonlinearity. Additional attention was paid to ANN training, structure and learning set sizes. Two ANN training algorithms have been utilised, a faster GPU executed standard backpropagation and an order of magnitude slower CPU based, but with significantly better convergence Levenberg-Marquardt training algorithm. The number of neurons in the hidden ANN layer varied from the size of the input layer to a number greater than the number in the output layer. The complete set of colour samples was divided into five learning sets of different sizes, with the smaller sets being subsets of the larger ones. To assess performances of the resulting ANNs, mean squared error, the goodness of fit and colour differences calculated from original and reconstructed reflectances assuming several standard illuminations have been compared. A noticeable reflectance performance improvement has been found by using two cameras, even though the cameras' equivalent channels exerted only small degrees of nonlinearity.
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Wueller, Dietmar. "Evaluating digital cameras." In Electronic Imaging 2006, edited by Nitin Sampat, Jeffrey M. DiCarlo, and Russel A. Martin. SPIE, 2006. http://dx.doi.org/10.1117/12.643727.

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Nunes, Marcelo D., and Ildemar P. Nunes. "Using CCTV to Support Remote Operation." In 2006 International Pipeline Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/ipc2006-10568.

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In 2005, TBG deployed a CCTV system at its compressor stations to support the pipeline operators in their daily duties, specifically compressor’s start and stop when the station is unmanned. Fixed cameras are installed inside the compressors building and a pan/tilt/zoom dome camera is installed at a high location that allows an overall view of the facility and its surroundings. The system also improves operational safety by enabling faster fire detection. The cameras connect to a digital video recorder that stores all motion detection events in a hard disk. Live video and recordings are available to any authorized user in TBG’s corporate network.
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Reports on the topic "Digitale camera's"

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Nicholas, Andrew. Digital Imaging Star Camera. Defense Technical Information Center, 2009. http://dx.doi.org/10.21236/ada531850.

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Marcot, Bruce, M. Jorgenson, Thomas Douglas, and Patricia Nelsen. Photographic aerial transects of Fort Wainwright, Alaska. Engineer Research and Development Center (U.S.), 2022. http://dx.doi.org/10.21079/11681/45283.

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This report presents the results of low-altitude photographic transects conducted over the training areas of US Army Garrison Fort Wainwright, in the boreal biome of central Alaska, to document baseline land-cover conditions. Flights were conducted via a Cessna™ 180 on two flight paths over portions of the Tanana Flats, Yukon, and Donnelly Training Areas and covered 486 mi (782 km) while documenting GPS waypoints. Nadir photographs were made with two GoPro™ cameras operating at 5 sec time-lapse intervals and with a handheld digital camera for oblique imagery. This yielded 6,063 GoPro photos and 706 oblique photos. Each image was intersected with a land-cover-classification map, collectively representing 38 of the 44 cover categories.
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Rubinfeld, Mike, and Charles Wilson. Gray calibration of digital cameras to meet NIST mugshot best practice. National Institute of Standards and Technology, 1999. http://dx.doi.org/10.6028/nist.ir.6322.

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Gardner, David W. A Fast-Framing, High Resolution Digital Camera. Phase I. Defense Technical Information Center, 1997. http://dx.doi.org/10.21236/ada328962.

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Komerath, N. M., O. D. Wong, and R. Mahalingam. Tunable Solid-State Laser and High Resolution Digital Cameras for Lagrangian Vortex Imaging. Defense Technical Information Center, 2000. http://dx.doi.org/10.21236/ada391255.

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Bhatt, Parth, Curtis Edson, and Ann MacLean. Image Processing in Dense Forest Areas using Unmanned Aerial System (UAS). Michigan Technological University, 2022. http://dx.doi.org/10.37099/mtu.dc.michigantech-p/16366.

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Imagery collected via Unmanned Aerial System (UAS) platforms has become popular in recent years due to improvements in a Digital Single-Lens Reflex (DSLR) camera (centimeter and sub-centimeter), lower operation costs as compared to human piloted aircraft, and the ability to collect data over areas with limited ground access. Many different application (e.g., forestry, agriculture, geology, archaeology) are already using and utilizing the advantages of UAS data. Although, there are numerous UAS image processing workflows, for each application the approach can be different. In this study, we developed a processing workflow of UAS imagery collected in a dense forest (e.g., coniferous/deciduous forest and contiguous wetlands) area allowing users to process large datasets with acceptable mosaicking and georeferencing errors. Imagery was acquired with near-infrared (NIR) and red, green, blue (RGB) cameras with no ground control points. Image quality of two different UAS collection platforms were observed. Agisoft Metashape, a photogrammetric suite, which uses SfM (Structure from Motion) techniques, was used to process the imagery. The results showed that an UAS having a consumer grade Global Navigation Satellite System (GNSS) onboard had better image alignment than an UAS with lower quality GNSS.
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Benfield, Mark C., Richard F. Shaw, and Christopher J. Schwehm. Development of a Vertically Profiling, High-Resolution, Digital Still Camera System. Defense Technical Information Center, 2000. http://dx.doi.org/10.21236/ada609777.

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Benfield, Mark C., Richard F. Shaw, and Christopher J. Schwehm. Development of a Vertically Profiling, High-Resolution, Digital Still Camera System. Defense Technical Information Center, 2001. http://dx.doi.org/10.21236/ada627807.

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Benfield, Mark C., Richard F. Shaw, and Christopher J. Schwehm. Development of a Vertically Profiling, High-Resolution, Digital Still Camera System. Defense Technical Information Center, 1999. http://dx.doi.org/10.21236/ada630177.

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Latz, Michael I. DURIP: A Low-Light Photon-Calibrated High-Resolution Digital Camera Imaging System. Defense Technical Information Center, 2006. http://dx.doi.org/10.21236/ada612146.

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