Partial reconstruction based template matching for motion vector derivation

A device for decoding video data, the device comprising:

• a memory configured to store the video data;
• and
• processing circuitry configured to:
• determine a neighboring block in a current frame is inter coded;
• generate a partial reconstruction of the neighboring block before an application of overlapped block motion compensation (OBMC) to samples for the neighboring block;
• in response to the determination that the neighboring block is inter coded, determine a template for a current block in the current frame based on the partial reconstruction of the neighboring block;
• after the determination of the template for the current block, apply OBMC to the samples for the neighboring block;
• determine a reference block in a reference frame corresponding to the template for the current block, wherein the reference frame is different from the current frame;
• determine motion vector information for the current frame based on the reference block and the template;
• generate a predictive block for the current block of video data based on the motion vector information;
• and
• decode the current block of video data based on the predictive block.

A method of encoding video data, the method comprising:

• determining, by a video encoder implemented in processing circuitry, a neighboring block in a current frame is inter coded;
• generating, by the video encoder, a partial reconstruction of the neighboring block before applying overlapped block motion compensation (OBMC) to samples for the neighboring block;
• in response to determining the neighboring block is inter coded, determining, by the video encoder, a template for a current block in the current frame based on the partial reconstruction of the neighboring block;
• after determining the template for the current block, applying, by the video encoder, OBMC to the samples for the neighboring block;
• determining, by the video encoder, a reference block in a reference frame corresponding to the template for the current block, wherein the reference frame is different from the current frame;
• determining, by the video encoder, motion vector information for the current frame based on the reference block and the template;
• generating, by the video encoder, a predictive block for the current block of video data based on the motion vector information;
• and
• generating, by the video encoder, residual sample values for the current block of video data based on the predictive block.

A device for encoding video data, the device comprising:

• a memory configured to store the video data;
• and
• processing circuitry configured to:
• determine a neighboring block in a current frame is inter coded;
• generate a partial reconstruction of the neighboring block before an application of overlapped block motion compensation (OBMC) to samples for the neighboring block;
• in response to the determination that the neighboring block is inter coded, determine a template for a current block in the current frame based on the partial reconstruction of the neighboring block;
• after the determination of the template for the current block, apply OBMC to the samples for the neighboring block;
• determine a reference block in a reference frame corresponding to the template for the current block, wherein the reference frame is different from the current frame;
• determine motion vector information for the current frame based on the reference block and the template;
• generate a predictive block for the current block of video data based on the motion vector information;
• and
• generate residual sample values for the current block of video data based on the predictive block.