Patent ID: 9497471
Filing Date: 2016-11-15
CPC Classification: G06T,H04N

Claim Text:
1. A computer-implemented method for a decoder, the computer-implemented method comprising: receiving, at the decoder, at least a luminance QP (quantization parameter) value and a first chroma QP bias value for a bi-directionally interpolated macroblock, wherein the first chroma QP bias value was determined at an encoder and signaled from the encoder to the decoder, wherein the decoder comprises a luminance channel, a first chroma channel and a second chroma channel, and wherein the encoder comprises a chroma channel having one-half of a horizontal resolution of the luminance channel of the decoder; utilizing, with the decoder, the luminance QP value and the first chroma QP bias value to determine a first chroma QP value for the bi-directionally interpolated macroblock by adding the first chroma QP bias value to the luminance QP value; and decompressing an image region of a video image using the luminance QP value and the determined first chroma QP value, wherein the determined first chroma QP value is less than a predetermined maximum value and greater than a predetermined minimum value, and wherein the determined first chroma QP value is determined for the first chroma channel.