Histogram segmentation based local adaptive filter for video encoding and decoding

A method comprising:

• using multiple histogram bin segmentation including first and second bins in an adaptive filter with offset;
• separately adaptively filtering pixel values in a first bin, the filter offset for the first bin adapted to the first bin;
• setting an offset for said first bin based on a sum of differences between filtered values output from the adaptive filter and original input pixel values input to the adaptive filter divided by the number of pixels in the first bin;
• separately adaptively filtering pixel values in a second bin, the filter offset for the second bin adapted to said second bin;
• and
• setting an offset for the second bin based on a sum of differences between filtered values output from the adaptive filter and original input pixel values input to the adaptive filter divided by the number of pixels in the second bin.

One or more non-transitory computer readable media storing instructions to perform a sequence comprising:

• using multiple histogram bin segmentation including first and second bins in an adaptive filter with offset;
• separately adaptively filtering pixel values in a first bin, the filter offset for the first bin adapted to the first bin;
• setting an offset for said first bin based on a sum of differences between filtered values output from the adaptive filter and original input pixel values input to the adaptive filter divided by the number of pixels in the first bin;
• separately adaptively filtering pixel values in a second bin, the filter offset for the second bin adapted to said second bin;
• and
• setting an offset for the second bin based on a sum of differences between filtered values output from the adaptive filter and original input pixel values input to the adaptive filter divided by the number of pixels in the second bin.

An apparatus comprising:

• means for using multiple histogram bin segmentation including first and second bins in an adaptive filter with offset;
• means for separately adaptively filtering pixel values in a first bin, the filter offset for the first bin adapted to the first bin;
• means for setting an offset for said first bin based on a sum of differences between filtered values output from the adaptive filter and original input pixel values input to the adaptive filter divided by the number of pixels in the first bin;
• means for separately adaptively filtering pixel values in a second bin, the filter offset for the second bin adapted to said second bin;
• and
• means for setting an offset for the second bin based on a sum of differences between filtered values output from the adaptive filter and original input pixel values input to the adaptive filter divided by the number of pixels in the second bin.