Method and apparatus for encoding and/or decoding video data using enhancement layer residual prediction for bit depth scalability

Method for encoding video data having a base layer and an enhancement layer, wherein the base layer has lower bit-depth resolution and lower spatial, temporal and/or SNR resolution than the enhancement layer, the method comprising the steps of

• encoding base layer data on slice level, wherein first base layer slices are intra-coded and second base layer slices are inter-coded;
• reconstructing the encoded base layer slices;
• upsampling reconstructed base layer slices, wherein first predicted versions of the corresponding enhancement layer slices are obtained that have higher spatial, temporal or SNR resolution than the base layer slices;
• generating for a first, intra-coded base layer slice a tone mapping table defining an individual mapping between an upsampled reconstructed first base layer slice and the corresponding original enhancement layer slice, wherein both slices are compared to each other and wherein no tone mapping tables are generated for second, inter-coded base layer slices;
• bit-depth upsampling the first predicted version of the enhancement layer slice based on said tone mapping, wherein a second predicted version of the corresponding enhancement layer slice is obtained that has higher bit-depth resolution than the first predicted version of the enhancement layer slice;
• generating an enhancement layer residual being the difference between the original enhancement layer slice and the corresponding second predicted version of the enhancement layer slice;
• and
• encoding the enhancement layer residual into an enhancement layer slice, wherein the enhancement layer slice includes in its slice header its corresponding tone mapping table.

Method for decoding video data having a base layer and an enhancement layer and being encoded on slice level, the method comprising the steps of

• receiving enhancement layer information and base layer information;
• extracting from the enhancement layer information tone mapping data from slice headers of intra-coded enhancement layer slices;
• performing inverse quantization and inverse transformation on the received information, wherein inverse quantized and inverse transformed enhancement layer information comprises residual information;
• reconstructing intra-coded base layer slices;
• upsampling base layer information, wherein the number of pixels is increased and for the increased number of pixels the value depth per pixel is increased, wherein for intra-coded slices the reconstructed base layer slices and the extracted tone mapping data are used, and wherein predicted enhancement layer information is obtained;
• and
• reconstructing from the predicted enhancement layer information and the inverse quantized and inverse transformed enhancement layer information reconstructed enhancement layer video information.

Apparatus for encoding video data having a base layer and an enhancement layer, wherein the base layer has lower bit-depth resolution and lower spatial, temporal and/or SNR resolution than the enhancement layer, comprising

• means for encoding base layer data on slice level, wherein first base layer slices are intra-coded and second base layer slices are inter-coded;
• means for reconstructing the encoded base layer slices;
• means for upsampling reconstructed base layer slices, wherein first predicted versions of the corresponding enhancement layer slices are obtained that have higher spatial, temporal or SNR resolution than the base layer slices;
• means for generating for a first, intra-coded base layer slice a tone mapping table defining an individual mapping between an upsampled reconstructed first base layer slice and the corresponding original enhancement layer slice, wherein both slices are compared to each other and wherein no tone mapping tables are generated for second, inter-coded base layer slices;
• means for bit-depth upsampling the first predicted version of the enhancement layer slice based on said tone mapping, wherein a second predicted version of the corresponding enhancement layer slice is obtained that has higher bit-depth resolution than the first predicted version of the enhancement layer slice;
• means for generating an enhancement layer residual being the difference between the original enhancement layer slice and the corresponding second predicted version of the enhancement layer slice;
• and
• means for encoding the enhancement layer residual into an enhancement layer slice, wherein the enhancement layer slice includes in its slice header its corresponding tone mapping table.

Apparatus for decoding video data having a base layer and an enhancement layer and being encoded on slice level, comprising

• means for receiving enhancement layer information and means for receiving base layer information;
• means for extracting from the enhancement layer information tone mapping data from slice headers of intra-coded enhancement layer slices;
• means for performing inverse quantization and inverse transformation on the received information, wherein inverse quantized and inverse transformed enhancement layer information comprises residual information;
• means for reconstructing intra-coded base layer slices;
• means for upsampling base layer information, wherein the number of pixels is increased and for the increased number of pixels the value depth per pixel is increased, wherein for intra-coded slices the reconstructed base layer slices and the extracted tone mapping data are used, and wherein predicted enhancement layer information is obtained;
• and
• means for reconstructing from the predicted enhancement layer information and the inverse quantized and inverse transformed enhancement layer information reconstructed enhancement layer video information.