Methods, systems and encoded bitstream for combined lossless and lossy coding
An encoder includes circuitry configured to receive an input video, select a current frame identify a first sub-picture of the current frame to be encoded using a lossless encoding protocol, and encode the current frame, wherein encoding the current frame includes encoding the first sub-picture using the lossless encoding protocol. An encoded bitstream provided by an encoder is also provided.
1. A non-transitory computer-readable recording medium storing an encoded bitstream which is decodable by decoder configured to:
receive the 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 non-transitory computer-readable recording medium of claim 1 wherein the first sub-picture is an independently coded sub-picture.
3. The non-transitory computer-readable recording medium of claim 1 wherein the second sub-picture is an independently coded sub-picture.
4. The non-transitory computer-readable recording medium of claim 1 wherein the coded picture includes a region coded using transform skip residual coding.
5. The non-transitory computer-readable recording medium of claim 4 wherein the region coded using transform skip residual coding is the first sub-picture.
6. A non-transitory computer-readable recording medium storing an encoded bitstream comprising:
a coded picture, the coded picture including a first coded sub-picture and a second coded sub-picture, wherein the first sub-picture is encoded using lossless encoding protocol and the second sub-picture is encoded using a lossy encoding protocol;
a first sub-picture header and a second sub-picture header;
the first sub-picture header signaling that the first sub-picture is coded using a lossless encoding protocol; and
the second sub-picture header signaling that the second sub-picture is coded using a lossy encoding protocol.
7. The non-transitory computer-readable recording medium of claim 6 wherein the first sub-picture is an independently coded sub-picture.
8. The non-transitory computer-readable recording medium of claim 6 wherein the second sub-picture is an independently coded sub-picture.
9. The non-transitory computer-readable recording medium of claim 6 wherein the picture includes a region coded using transform skip residual coding.
10. The non-transitory computer-readable recording medium of claim 6 wherein the region coded using transform skip residual coding is the first sub-picture.
11. A method of transmitting an encoded bitstream which is decodable by decoder receiving the bitstream comprising:
receiving an input video;
generating an encoded bitstream from the input video, the encoded 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;
transmit the encoded bitstream to a decoder, wherein the decoder is configured to:
receive the encoded bitstream;
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.
12. The method claim 11 , wherein the first sub-picture is an independently coded sub-picture.
13. The method claim 11 , wherein the second sub-picture is an independently coded sub-picture.
14. The method of claim 11 , wherein the coded picture includes a region coded using transform skip residual coding.
15. The method claim 14 , wherein the region coded using transform skip residual coding is the first sub-picture.