Techniques of multi-hypothesis motion compensation

Coded video data, stored in a computer readable medium, representing frame content, the coded video data comprising:

• coded video data of a plurality of pixel blocks, each represented by a plurality of coding hypotheses, each coding hypothesis representing prediction data for the pixel block according to a respective prediction search,
• a parameter identifying an element from a list of prediction references identifying a reference frame, the parameter applying to hypotheses of multiple coded pixel blocks.

A video decoding method, comprising:

• responsive to data provided from a channel identifying a number of the coding hypotheses applied to a pixel block to be decoded, developing a prediction block for the pixel block from coding data representing the hypotheses, each coding hypothesis identifying a respective prediction source, and
• decoding the pixel block with reference to the prediction block.

A video coding method, comprising:

• developing a first coding hypothesis for an input pixel block of frame content, the first coding hypothesis including prediction data selected using a first partition size,
• developing a second coding hypothesis for the input pixel block, the second coding hypothesis including prediction data selected using a second partition size different from the first partition size,
• coding the input pixel block with reference to a prediction block formed from the prediction data of the first coding hypothesis and the prediction data of the second coding hypothesis.

A video decoding method, comprising:

• developing first prediction data from coded video data representing a first coding hypothesis of a pixel block to be decoded, the coded video data identifying a first partition size associated with the first prediction data,
• developing second prediction data from coded video data representing a second coding hypothesis of a pixel block to be decoded, the coded video data identifying a second partition size associated with the second prediction data, the second partition size different from the first partition size
• decoding coded video data of the pixel block to be decoded with reference to a prediction block formed from the first prediction data and the second prediction data.

Coded video data, stored in a computer readable medium, representing a pixel block of frame content having been predictively coded, the coded video data comprising:

• data representing a first coding hypothesis for the pixel block of frame content, the first coding hypothesis identifying a first partition size of the first coding hypothesis,
• data representing a second coding hypothesis for the pixel block of frame content, the second coding hypothesis identifying a second partition size for the second coding hypothesis, the second partition size different from the first partition size;
• data representing content of the pixel block having been coded with reference to a prediction block formed from the prediction data of the first coding hypothesis and the prediction data of the second coding hypothesis.