Computation of Color Constant Descriptors

Random recognition rate Full range per band White patch retinex Gray world assumption Simplified hom Gamut constraint 3D Gamut constraint 2D Color cluster rotation Comprehensive normalization Risson (2003) 

Horn (1974)/Blake (1985) Moore et al. (1991) Retinex Moore et al. (1991) Extended Rahman et al. (1999) Homomorphic filtering Homomorphic filtering (HVS) Intrinsic (min. entropy) 

Local space average color (1) Local space average color (2) Local space average color (3) Local space average color (4) Local space average color (5) Local space average color (6) Local space average color (7) Anisotropic L.S.A. color (1) Anisotropic L.S.A. color (2) Anisotropic L.S.A. color (3) Anisotropic L.S.A. color (4) Anisotropic L.S.A. color (5) Anisotropic L.S.A. color (6) Anisotropic L.S.A. color (7) Combined WP/L.S.A. color Comprehensive L.S.A. color 

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Land (1983, 1986b) Land et al. (1983) also showed that the visual cortex is involved in color perception. Originally, it was not known whether the computation of color constant descriptors is carried out inside the retina or the visual cortex. Marr (1974) suggested in 1974 that lightness computations are carried out inside the retina. He gave a detailed... 

Figure 11.10 Computation of color constant descriptors using normalized color shifts. The first layer is the input layer. The second layer computes local space average color. The output is computed in the third layer. The measured red, green, and blue components are stored in cells c, with i e r, g, b. The average of these three components is stored in cell c. Space average color is stored in cells a,, the average of these three components in stored in a. Output cells are denoted by n, (from Ebner 2003c).

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