METHODS, SYSTEMS AND DECODER FOR COMBINED LOSSLESS AND LOSSY CODING
A decoder includes circuitry configured to receive an encoded bitstream, select a current frame, identify a first sub-picture of the current frame encoded using a lossless encoding protocol, and decode the current frame, wherein decoding the current frame includes decoding the first sub-picture using the lossless encoding protocol.
1 . A decoder configured to:
receive a bitstream, the bitstream including a coded picture, the coded picture including a first coded sub-picture and a second coded sub-picture, the bitstream also including a first sub-picture header and a second sub-picture header;
detect in the first sub-picture header that the first sub-picture is coded using a lossless encoding protocol;
detect in the second sub-picture header that the second sub-picture is coded using a lossy encoding protocol;
decode the first sub-picture using a protocol for lossless decoding corresponding to the detected lossless encoding protocol; and
decode the second sub-picture using a protocol corresponding to the detected lossy encoding protocol.
2 . The decoder of claim 1 wherein the first sub-picture is an independently coded sub-picture.
3 . The decoder of claim 2 wherein the second sub-picture is an independently coded sub-picture.
4 . The decoder of claim 1 wherein the coded picture includes a region coded using transform skip residual coding.
5 . The decoder of claim 4 wherein the region coded using transform skip residual coding is the first sub-picture.
6 . The decoder of claim 1 wherein the coded picture further includes a region coded using BDPCM.
7 . The decoder of claim 1 wherein the picture includes an intra-coded region.