Region-based dichromatic estimation method for illumination color estimation

Harumi Kawamura; Sadayuki Hongo; Isamu Yoroizawa

doi:10.1117/12.157881

22 October 1993 Region-based dichromatic estimation method for illumination color estimation

Harumi Kawamura, Sadayuki Hongo, Isamu Yoroizawa

Proceedings Volume 2094, Visual Communications and Image Processing '93; (1993) https://doi.org/10.1117/12.157881
Event: Visual Communications and Image Processing '93, 1993, Cambridge, MA, United States

Abstract

We propose the region-based dichromatic (RBD) estimation method for illumination color estimation. The method realizes illumination color estimation and, at the same time, illumination independent color object segmentation, even if the highlights in the image are generated by several objects of different color. The dichromatic reflection theory, which was proposed by S. A. Shafer and T. Kanade, yields a method that sometimes outputs incorrect illumination color when the color of high luminance matte region is similar to the illumination color. The proposed method solves this problem by extracting highlights as bicomponent regions. The RBD estimation method proceeds as follows: (1) extraction of high luminance regions, (2) grouping of similar color regions based on color difference in the L^*u^*v^* uniform color space, (3) extraction of highlight regions which contain two reflection components, (4) illumination color estimation by finding the point that minimizes the summation of the distance to all highlight lines in each highlight region. The experimental results for real images show that the RBD estimation method estimates the illumination color more correctly than the conventional method.

Citation Download Citation

Harumi Kawamura, Sadayuki Hongo, and Isamu Yoroizawa "Region-based dichromatic estimation method for illumination color estimation", Proc. SPIE 2094, Visual Communications and Image Processing '93, (22 October 1993); https://doi.org/10.1117/12.157881

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