British Broadcasting Corporation

Nikola Sprljan

Marta Mrak

David Flynn

Andrea Gabriellini

In the encoding of video data, a list of references pictures is constructed to be used in decoding. Prediction (direction) modes are defined by n-tuples (x, x, . . . , x), where xspecifies prediction option of the m-th component of the motion vector field, m=0, . . . , M-1, where M components to the motion fields exist; where a coding option xis an element from a set composed of all defined combinations of motion prediction modes and reference picture indices, with the addition of an option '/', x&#x3b5;{'/', 0, 1, . . . , r&#x2212;1}; where option &#x201c;/&#x201d; specifies that the component is not used, and other options 0, 1, . . . , r&#x2212;1 specify one of rcombinations. A subset of all possible n-tuples is provided and a prediction mode used for predicting an inter-coded block is defined by reference to that subset.

Video encoding and decoding using reference pictures

Video encoding or decoding utilizing a spatial transform operating on rows and columns of a block, with a set of transform skip modes including: transform on rows and columns; transform on rows only; transform on columns only; no transform. An indication of the selected mode is provided to the decoder. Coefficients are scaled by a factor dependent upon the norm of the transform vector of the skipped transform to bring the untransformed image values to the same level as transformed coefficients.

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Nikola Sprljan