Patent ID: 6937253

Claim:
A method for determining whether an input image is defined in accordance with a luminance-chrominance color space, comprising: receiving an input image in three dimensional color space, S 1 , S 2 and S 3 , where S 1 is an image value in the first dimension, S 2 is an image value in the second dimension and S 3 is an image value in the third dimension; extracting low and high extrema of S 1 values in the image; obtaining deviation of S 2 and S 3 from a predefined neutral axis for all pixels in the image whose S 1 value is either the low or the high extremum; testing a condition that certain of the deviations are within predetermined thresholds; and determining, if the condition holds true, that the image is in a luminance-chrominance color space.