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http://dx.doi.org/10.5909/JEB.2012.17.2.305

Method of Measuring Color Difference Between Images using Corresponding Points and Histograms  

Hwang, Young-Bae (Korea Electronics Technology Institute(KETI))
Kim, Je-Woo (Korea Electronics Technology Institute(KETI))
Choi, Byeong-Ho (Korea Electronics Technology Institute(KETI))
Publication Information
Journal of Broadcast Engineering / v.17, no.2, 2012 , pp. 305-315 More about this Journal
Abstract
Color correction between two or multiple images is very crucial for the development of subsequent algorithms and stereoscopic 3D camera system. Even though various color correction methods are proposed recently, there are few methods for measuring the performance of these methods. In addition, when two images have view variation by camera positions, previous methods for the performance measurement may not be appropriate. In this paper, we propose a method of measuring color difference between corresponding images for color correction. This method finds matching points that have the same colors between two scenes to consider the view variation by correspondence searches. Then, we calculate statistics from neighbor regions of these matching points to measure color difference. From this approach, we can consider misalignment of corresponding points contrary to conventional geometric transformation by a single homography. To handle the case that matching points cannot cover the whole regions, we calculate statistics of color difference from the whole image regions. Finally, the color difference is computed by the weighted summation between correspondence based and the whole region based approaches. This weight is determined by calculating the ratio of occupying regions by correspondence based color comparison.
Keywords
Color difference; Color correction; Stereoscopic 3D camera; Stereo matching;
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