Patent ID: 9332278
Filing Date: 2016-05-03
CPC Classification: H04N

Claim Text:
1. A method comprising: obtaining video information at a video decoder apparatus, the video information including largest coding units of video data, each of the largest coding units having a common size; obtaining, at the video decoder apparatus, an adaptive loop filter on/off indicator for each of the largest coding units having the common size, wherein each of the largest coding units includes a respective adaptive loop filter on/off indicator; obtaining, in response to the on/off indicator being on, a plurality of quantized filter coefficients corresponding to a set of filter coefficients except for one filter coefficient, for a given largest coding unit, wherein the plurality of quantized filter coefficients are filter coefficients quantized by multiplication with a number 2 deriving values for the set of filter coefficients, except for one filter coefficient, from the plurality of quantized coefficients; deriving a value for the one filter coefficient based on a priori knowledge of a sum of all filter coefficients for the given largest coding unit; and performing, by the video decoder apparatus, adaptive loop filtering to the given largest coding unit using values for all the filter coefficients in the set of filter coefficients.