Apple Inc.
Adaptive chroma downsampling and color space conversion techniques

Abstract:

Techniques for selecting a luminance value for color space conversion are disclosed. Techniques include determining values for Cb and Cr from values for R', G', and B'; producing a reconstructed Cb* value and a reconstructed Cr* value by processing the Cb and Cr values; and determining a plurality of Y' value options from the values for Cb* and Cr*. A Y' output value may be selected based on the plurality of Y' value options.