Methods and systems of video coding using reference regions
A decoder includes circuitry configured to receive a bitstream, identify a first frame, locate a first independent reference region within the first frame, extract the first independent reference region from the first frame, decode a second frame using the first independent reference region as a reference for the second frame.
1. A decoder, the decoder configured to:
receive a bitstream including a signaling information, and a first coded picture, at least a portion of the signaling information being associated with the first coded picture;
detect in the signaling information associated with the first coded picture, that an independent sub-picture is present in the first coded picture and a location of the coded sub-picture in the first coded picture;
extract from the first coded picture, and decode, the coded sub-picture to form a rectangular reference picture having a first resolution;
determine a predictor in the reference picture using a scaling constant obtained from information in the bitstream; and
use the predictor to decode a subsequent picture having a second resolution.
2. The decoder of claim 1 , wherein the predictor is formed using an interpolation filter.
3. The decoder of claim 1 , wherein the predictor is determined using a motion vector candidate list.
4. The decoder of claim 1 , wherein the first predictor is used to decode a first subsequent picture.
5. The decoder of claim 4 , further configured to determine a second predictor in the second reference picture using a second scaling constant determined from information in the bitstream.
6. The decoder of claim 5 , wherein the second predictor is used to decode a second subsequent picture.
7. The decoder of claim 6 , wherein the first and second subsequent pictures are sub-pictures extracted from the same picture.
8. The decoder of claim 1 , wherein the first resolution is larger than the second resolution.
9. The decoder of claim 1 , wherein the first resolution is smaller than the second resolution.
10. The decoder of claim 1 , wherein the first resolution is the same as the second resolution.
11. An encoder for encoding a bitstream to be decoded by a compliant decoder, the bitstream comprising a sequence parameter set, a first coded picture, and a subsequent coded picture, the decoder being configured to:
receive the bitstream;
detect in the sequence parameter set associated with the first coded picture, that an independent sub-picture is present in the first coded picture and a location of the coded sub-picture in the first coded picture;
extract from the first coded picture, and decode, the coded sub-picture to form a reference picture;
determine a predictor in the reference picture using a scaling constant obtained from information in the bitstream, the information including an index; and
use the predictor to decode a subsequent picture.