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15 March 2019 Practical testing of irradiance-independent camera color calibration
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Proceedings Volume 11041, Eleventh International Conference on Machine Vision (ICMV 2018); 110411B (2019) https://doi.org/10.1117/12.2522907
Event: Eleventh International Conference on Machine Vision (ICMV 2018), 2018, Munich, Germany
Abstract
The procedure of camera color calibration ensures accurate and repeatable acquisition of scene colors. The main process of calibration procedure is the color transformation from camera RGB color space to device independent color space, such as CIEXYZ or CIELAB. Typical calibration procedure assumes the uniformity of irradiance across the whole scene, but such assumption is difficult to achieve. Spatial changes in irradiance are typical for indoor and outdoor light conditions. The problem of color calibration under non-uniform lighting was researched by, e.g., B. Funt and P. Bastani. In the present article, their calibration procedure was tested together with the classic approach to camera calibration. Based on these experiments a modification was proposed, in which RGB image values are scaled accordingly to the results of additional measurements. This modification allows to obtain, in conditions of spatially nonuniform scene illumination, lower values of color differences ΔE * ab and ΔE00 than in cases of classic method and FuntBastani method.
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Andrzej Kordecki "Practical testing of irradiance-independent camera color calibration", Proc. SPIE 11041, Eleventh International Conference on Machine Vision (ICMV 2018), 110411B (15 March 2019); https://doi.org/10.1117/12.2522907
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