Patent ID: 8798149
Filing Date: 2014-08-05
Classification: H04N

Abstract:
1. A method for encoding video data having a base layer and an enhancement layer, wherein pixels of the base layer have less color bit depth than pixels of the enhancement layer, the method comprising: encoding base layer data on a first granularity level, wherein the base layer data are intra-coded; reconstructing the encoded base layer data; generating for the intra-coded base layer data a first tone mapping table defining a tone mapping between original enhancement layer data and corresponding reconstructed base layer data; generating for a fraction of the intra-coded base layer data a different second tone mapping table defining a tone mapping between said fraction of the original enhancement layer data and the corresponding fraction of the reconstructed base layer data; generating a difference table representing the difference between the first tone mapping table and the second tone mapping table; bit-depth upsampling the reconstructed base layer data based on said first and second tone mapping tables, wherein the second tone mapping table is used only for said fraction of the reconstructed base layer and the first tone mapping table is used for the remainder of the reconstructed base layer, and wherein a predicted version of the corresponding enhancement layer data is obtained that has higher bit-depth resolution than the base layer data; generating an enhancement layer residual being the difference between the original enhancement layer data and the corresponding predicted version of the enhancement layer data; and encoding the enhancement layer residual, the first tone mapping table and said difference table, wherein the encoded first tone mapping table is associated with the encoded base layer or enhancement layer data and the difference table is associated with said fraction of the encoded base layer data or enhancement layer data.