Patent ID: 8411206
Filing Date: 2013-04-02
Classification: H04N

Abstract:
1. A method for decoding an input signal, comprising: receiving image data signals in a digitized gamma-corrected YCbCr format encoded in an extended YCC color space; normalizing the received image data signals to recover normalized luminance and chrominance Y′C scaling and offsetting the normalized Y′C performing a conversion operation on the normalized, scaled and offset Y′C scaling and offsetting the extended R′G′B′ formatted data signals, the scaling and offsetting for each extended R′G′B′ component determined by an amount of negative offsetting needed so the extended R′G′B′ components will be substantially non-negative for any potential input YCbCr format value and fall within a given positive range of integer values; and performing a degamma operation on the extended R′G′B′ formatted data to obtain RGB formatted data without gamma correction; wherein the normalizing comprises recovering normalized luminance and chrominance data Y′C with coefficients determined to substantially invert the digitizing process performed to transform gamma-corrected RGB data into YCbCr format.