Encoder, decoder, computer program and computer program product for processing a frame of a video sequence
An encoder is provided that comprises a partitioner and an entropy coder. The partitioner is configured to receive a current block of the frame and obtain a list of candidate geometric partitioning (GP) lines. Each of the candidate GP lines is generated based on information of one or more candidate neighbor blocks of the current block. The partitioner is further configured to determine a final GP line that partitions the current block into two segments, select a GP line from the list of GP lines to obtain a selected GP line, and generate a GP parameter for the current block. The GP parameter includes an offset information indicating an offset between the final GP line and the selected GP line. The entropy coder is configured to encode the GP parameter.
1. An encoder for encoding a frame of a video sequence, comprising:
an entropy coder configured to encode a geometric partitioning (GP) parameter; and
a partitioner configured to:
obtain a list of one or more candidate GP lines, wherein each of the one or more candidate GP lines is the same as a GP line of each of one or more neighbor blocks of a current block, and
select, based on the GP parameter and from the list of one or more candidate GP lines, a final GP line;
wherein the final GP line partitions the current block into two segments, and
wherein the GP parameter includes offset information indicating an offset between the final GP line and a predetermined GP line.
2. The encoder according to claim 1 , wherein the list of one or more candidate GP lines comprises, for each respective candidate GP line of the one or more candidate GP lines, respective candidate GP line specific line information,
wherein the respective candidate GP line specific line information comprises:
a coordinate (x,y) indicating a start point and a coordinate indicating an end point of the respective candidate GP line, or
a distance between the respective candidate GP line and a center of the current block, and an angle of the respective candidate GP line.
3. The encoder according to claim 2 , wherein the offset between the final GP line and the predetermined GP line comprises an offset between the start point of the predetermined GP line and a start point of the final GP line, and an offset between the end point of the predetermined GP line and an end point of the final GP line.
4. A decoder for decoding a frame in a video sequence, comprising:
an entropy decoder configured to decode an encoded geometric partitioning (GP) parameter for a current block, wherein the encoded GP parameter includes offset information indicating an offset between a final GP line and a predetermined GP line, and
a partitioner configured to:
obtain a list of one or more candidate GP lines, wherein each of the one or more candidate GP lines is the same as a GP line of each of one or more neighbor blocks of the current block, and
select a final GP line, based on the decoded GP parameter, from the list of the one or more candidate GP lines;
wherein the final GP line partitions the current block into two segments.
5. The decoder according to claim 4 , wherein the list of one or more candidate GP lines comprises, for each respective candidate GP line of the one or more candidate GP lines, respective candidate GP line specific line information,
wherein the respective candidate GP line specific line information comprises:
a coordinate (x,y) indicating a start point and a coordinate indicating an end point of the respective candidate GP line; or
a distance between the respective candidate GP line and a center of the current block, and an angle of the respective candidate GP line.
6. The decoder according to claim 5 , wherein the offset between the final GP line and the predetermined GP line comprises an offset between the start point of the predetermined GP line and a start point of the final GP line, and an offset between the end point of the predetermined GP line and an end point of the final GP line.