Patent ID: 6912307
Filing Date: 2005-06-28
Classification: G06T,H04N

Abstract:
1. A method for correcting the color contrast of a scene, the scene including an intensity spectrum at each of a plurality of pixels, the method comprising the steps of: a) providing a red image, a green image, and a blue image, each image having a pixel value at each of the plurality of pixels; b) computing a center red response, a center green response and a center blue response based on said images; c) computing a surround red response, a surround green response and a surround yellow response based on said images; d) computing a red, a green and a blue on-center opponent and filtered opponent response, based on said center and surround responses; e) computing a red, a green and a yellow off-center opponent and filtered opponent response based on said center and surround responses; f) computing a red, a green and a blue double-opponent response (do-response) and a corresponding filtered double-opponent response based on said on-center and off-center filtered opponent responses; g) computing a red, a green and a blue do-remote response based on a set of responses selected from the group consisting of said on-center filtered opponent responses and said filtered double-opponent responses; and h) for each pixel: correcting each of said red, green, and blue double-opponent responses for color contrast using respectively said red, green and blue do-remote response, thereby producing corrected red, green and blue double-opponent responses.