Method, apparatus and system for encoding and decoding video data using a block dictionary

A computer-implemented method of encoding a coding unit into a video bitstream, comprising:

• determining, using a processor, reconstructed samples for a first prediction unit in a first coding unit of a frame, from video frame data;
• establishing, using the processor, a dictionary store flag for indicating that reconstructed samples for the first prediction unit are stored if the first prediction unit has a predetermined size, the dictionary store flag being based on a partition mode for the first prediction unit;
• and
• where the dictionary store flag indicates that reconstructed samples for the first prediction unit are stored:
• storing reconstructed samples for the first prediction unit of the frame in a dictionary block memory buffer;
• determining, using the processor, reconstructed samples for a second prediction unit in a second coding unit of the frame, the reconstructed samples for the second prediction unit being copied from reconstructed samples for the first prediction unit from the dictionary block memory buffer;
• and
• outputting, using the processor, the reconstructed samples for the second prediction unit in the bitstream.

A non-transitory computer readable storage medium having a program recorded thereon, the program being executable by a processor to decode a coding unit from a video bitstream, the program comprising:

• code for determining reconstructed samples for a first prediction unit in a first coding unit of a frame, from the video bitstream;
• code for decoding a dictionary store flag from the video bitstream based on a partition mode for the first prediction unit;
• and
• code, operative where the dictionary store flag indicates that reconstructed samples for the first prediction unit be stored if the first prediction unit has a predetermined size, to:
• store the reconstructed samples for the first prediction unit of the frame into a memory buffer;
• determine reconstructed samples for a second prediction unit in a second coding unit of the frame, the reconstructed samples for the second prediction unit being copied from reconstructed samples for the first prediction unit from the memory buffer;
• and
• output the reconstructed samples for the second prediction unit in the frame.

A non-transitory computer readable storage medium having a program recorded thereon, the program being executable by a processor to encode a coding unit into a video bitstream, the program comprising:

• code for determining reconstructed samples for a first prediction unit in a first coding unit of a frame, from video frame data;
• code for establishing a dictionary store flag for indicating that reconstructed samples for the first prediction unit are stored if the first prediction unit has a predetermined size, the dictionary store flag being based on a partition mode for the first prediction unit;
• and
• code, operative where the dictionary store flag indicates that reconstructed samples for the first prediction unit are stored, to:
• store reconstructed samples for the first prediction unit of the frame in a dictionary block memory buffer;
• determine reconstructed samples for a second prediction unit in a second coding unit of the frame, the reconstructed samples for the second prediction unit being copied from reconstructed samples for the first prediction unit from the dictionary block memory buffer;
• and
• output the reconstructed samples for the second prediction unit in the bitstream.

A video decoder adapted to decode a coding unit from a video bitstream, the decoder comprising:

• reconstruction apparatus adapted to use a processor to determine reconstructed samples and decode a dictionary store flag for a first prediction unit in a first coding unit of a frame, from the video bitstream;
• and
• a dictionary block copy module adapted, where the dictionary store flag indicates that reconstructed samples for the first prediction unit be stored if the first prediction unit has a predetermined size, the dictionary store flag being based on a partition mode for the first prediction unit, to:
• store the reconstructed samples for the first prediction unit of the frame into a processor-accessible memory buffer;
• determine, using the processor, reconstructed samples for a second prediction unit in a second coding unit of the frame, the reconstructed samples for the second prediction unit being copied from reconstructed samples for the first prediction unit from the memory buffer;
• and
• output, using the processor, the reconstructed samples for the second prediction unit in the frame.

A video encoder for encoding a coding unit into a video bitstream, the video encoder comprising:

• reconstruction apparatus adapted to use a processor to determine reconstructed samples for a first prediction unit in a first coding unit of a frame from video frame data;
• a dictionary block selector adapted to establish a dictionary store flag for indicating that reconstructed samples for the first prediction unit are stored if the first prediction unit has a predetermined size, the dictionary store flag being based on a partition mode for the first prediction unit;
• and
• a dictionary block copy module adapted, where the dictionary store flag indicates that reconstructed samples for the first prediction unit are stored, to:
• store reconstructed samples for the first prediction unit of the frame in a dictionary block memory buffer;
• determine, using the processor, reconstructed samples for a second prediction unit in a second coding unit of the frame, the reconstructed samples for the second prediction unit being copied from reconstructed samples for the first prediction unit from the dictionary block memory buffer;
• and
• output, using the processor, the reconstructed samples for the second prediction unit in the bitstream.