ABSTRACT
The early visual processes that encode local contrast in the image are critical components of lightness and color constancy (see Whittle, Gilchrist chapters, this volume). In the Arend-Blake model (Arend & Goldstein, 1987a; Blake, 1985a), a model of brightness perception in complex fields, brightness fields are computed by spatial integration of local contrasts. However, contrast encoding is not in itself sufficient to produce lightness and color constancy in natural scenes.
