Luminance based coding tools for video compression
AssigneeDolby Laboratories Licensing Corporation
InventorsPeng Yin, Guan-Ming Su, Taoran Lu, Tao Chen, Walter J. Husak
Life of this patent
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Abstract
Sample data and metadata related to spatial regions in images may be received from a coded video signal. It is determined whether specific spatial regions in the images correspond to a specific region of luminance levels. In response to determining the specific spatial regions correspond to the specific region of luminance levels, signal processing and video compression operations are performed on sets of samples in the specific spatial regions. The signal processing and video compression operations are at least partially dependent on the specific region of luminance levels.
Claims7
An apparatus for processing a spatial region of a video image represented in a video signal, the apparatus comprising:
- an input for receiving an input image in a video bitstream comprising luminance and chroma pixel values;
- and
- a processor, wherein the processor:
- determines a luminance indicator of a spatial image region in the input image based on a plurality of luminance pixel values in the spatial image region, wherein the luminance indicator indicates that a specific partition corresponds to a specific range of luminance levels within two or more ranges of luminance levels in the spatial image region;
- determines one or more filtering parameters for a deblocking filter, wherein the filtering parameters depend on the luminance indicator in the spatial image region;
- and
- applies the deblocking filter to the spatial image region to generate a filtered image region, wherein the deblocking filter with the one or more filtering parameters is applied to filter the plurality of luminance pixel values in the spatial image region to generate a plurality of filtered luminance pixel values in the filtered image region.
Dependencies are inferred from the claim text.