Patent ID: 7894000

Claim:
A method for dominant color extraction from video content encoded in a rendered color space (RGB) to produce, using perceptual rules, a dominant color (DC) for emulation by an ambient light source ( 88 ), comprising: [1] Performing dominant color extraction from pixel chromaticities (Cp) from said video content in said rendered color space to produce a dominant color by extracting any of: [a] a mode of said pixel chromaticities; [b] a median of said pixel chromaticities; [c] a weighted average by chromaticity of said pixel chromaticities; [d] a weighted average of said pixel chromaticities using a pixel weighting function (W) that is a function of any of pixel position (i, j), chromaticity (x, y, R), and luminance (L); [2] Further deriving the chromaticity of said dominant color in accordance with a perceptual rule, said perceptual rule chosen from any of: [a] a simple chromaticity transform (SCT); [b] a weighted average using said pixel weighting function (PF 8 ) so further formulated as to exhibit an influence from scene content that is obtained by assessing any of chromaticity and luminance for a plurality of pixels in said video content; [c] an extended dominant color extraction (EE 8 ) using a weighted average where said pixel weighting function is formulated as a function of scene content that is obtained by assessing any of chromaticity and luminance for a plurality of pixels in said video content, with said pixel weighting function further formulated such that weighting is at least reduced for majority pixels (MP); and [3] Transforming said dominant color from said rendered color space to a second rendered color space (R′G′B′) so formed as to allow driving said ambient light source.