Video encoding and decoding

A method of decoding a bitstream comprising an encoded sequence of digital images, at least one block having been encoded by inter prediction, the method comprising:

• generating a set of motion vector predictor candidates for a block to decode of a current frame, the set of motion vector predictor candidates being permitted to include, if available, at least one spatial motion vector predictor candidate and no more than one temporal motion vector predictor candidate, the generating comprising, if available, selecting as said temporal motion vector predictor candidate a motion vector at a predetermined position in a block of a reference frame, the reference frame being different from the current frame, wherein the block of the reference frame is located in vicinity of a bottom right position of an area, wherein the block of the reference frame is neighboring the area, and wherein the area has the same position and the same size as the block to decode;
• selecting, based on information decoded from the bitstream capable of identifying one of the motion vector predictor candidates of the generated set, a motion vector predictor candidate as a motion vector predictor for the block to decode;
• and
• determining a motion vector for the block to decode based on the motion vector predictor.

An apparatus for encoding a sequence of digital images into a bitstream, at least one block being encoded by inter prediction, the apparatus comprising:

• a generating unit configured to generate a set of motion vector predictor candidates for a block to encode of a current frame, the set of motion vector predictor candidates being permitted to include, if available, at least one spatial motion vector predictor candidate and no more than one temporal motion vector predictor candidate, wherein, if available, the generating unit selects as said temporal motion vector predictor candidate a motion vector at a predetermined position in a block of a reference frame, the reference frame being different from the current frame, wherein the block of the reference frame is located in vicinity of a bottom right position of an area, wherein the block of the reference frame is neighboring the area, and wherein the area has the same position and the same size as the block to encode;
• a selecting unit configured to select a motion vector predictor candidate as a motion vector predictor for encoding a motion vector associated with the block to encode using the motion vector predictor candidates of the generated set;
• and
• an encoding unit configured to encode in the bitstream information identifying the selected motion vector predictor candidate.

An apparatus for decoding a bitstream comprising an encoded sequence of digital images, at least one block having been encoded by inter prediction, the apparatus comprising:

• a generating unit configured to generate a set of motion vector predictor candidates for a block to decode of a current frame, the set of motion vector predictor candidates being permitted to include, if available, at least one spatial motion vector predictor candidate and no more than one temporal motion vector predictor candidate, wherein, if available, the generating unit selects as said temporal motion vector predictor candidate a motion vector at a predetermined position in a block of a reference frame, the reference frame being different from the current frame, wherein the block of the reference frame is located in vicinity of a bottom right position of an area, wherein the block of the reference frame is neighboring the area, and wherein the area has the same position and the same size as the block to decode;
• a selecting unit configured to select, based on information decoded from the bitstream capable of identifying one of the motion vector predictor candidates of the generated set, a motion vector predictor candidate as a motion vector predictor for the block to decode;
• and
• a determining unit configured to determine a motion vector for the block to decode based on the motion vector predictor.

A non-transitory computer-readable medium storing a program which, when executed, causes a computer to execute a process of encoding a sequence of digital images into a bitstream, at least one block being encoded by inter prediction, the process comprising:

• generating a set of motion vector predictor candidates for a block to encode of a current frame, the set of motion vector predictor candidates being permitted to include, if available, at least one spatial motion vector predictor candidate and no more than one temporal motion vector predictor candidate, the generating comprising, if available, selecting as said temporal motion vector predictor candidate a motion vector at a predetermined position in a block of a reference frame, the reference frame being different from the current frame, wherein the block of the reference frame is located in vicinity of a bottom right position of an area, wherein the block of the reference frame is neighboring the area, and wherein the area has the same position and the same size as the block to encode;
• selecting a motion vector predictor candidate as a motion vector predictor for encoding a motion vector associated with the block to encode using the motion vector predictor candidates of the generated set;
• and
• encoding in the bitstream information identifying the selected motion vector predictor candidate.

A non-transitory computer-readable medium storing a program which, when executed, causes a computer to execute a process of decoding a bitstream comprising an encoded sequence of digital images, at least one block having been encoded by inter prediction, the process comprising:

• generating a set of motion vector predictor candidates for a block to decode of a current frame, the set of motion vector predictor candidates being permitted to include, if available, at least one spatial motion vector predictor candidate and no more than one temporal motion vector predictor candidate, the generating comprising, if available, selecting as said temporal motion vector predictor candidate a motion vector at a predetermined position in a block of a reference frame, the reference frame being different from the current frame, wherein the block of the reference frame is located in vicinity of a bottom right position of an area, wherein the block of the reference frame is neighboring the area, and wherein the area has the same position and the same size as the block to decode;
• selecting, based on information decoded from the bitstream capable of identifying one of the motion vector predictor candidates of the generated set, a motion vector predictor candidate as a motion vector predictor for the block to decode;
• and
• determining a motion vector for the block to decode based on the motion vector predictor.