Fast intra mode prediction for a video encoder
AssigneeThomson Licensing
InventorsXiaoan Lu, Peng Lin, Jill MacDonald Boyce
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Abstract
There are provided video encoders and corresponding methods for encoding video data for an image that is divisible into macroblocks. A video encoder includes an encoder for performing into mode selection when encoding a current macroblock by testing a first subset of intra modes to compute a rate distortion cost, and utilizing the rate distortion cost to determine whether to terminate the intra mode selection and which additional intra modes, if any, are to be examined with respect to the current macroblock.
Claims10
An apparatus for encoding video data for an image that is divisible into macroblocks, comprising:
- an encoder for performing intra 4×4 mode selection by:
- selecting an intra 16×16 mode;
- if the rate distortion cost of the selected intra 16×16 mode is less than a pre-defined threshold, selecting an intra 4×4 mode from only a first subset of intra 4×4 modes, wherein a second subset of remaining intra 4×4 modes is selected for testing, based upon which of the intra 4×4 modes of the first subset of intra 4×4 modes had a lowest cost.
A method for encoding video data for an image that is divisible into macroblocks, comprising the step of:
- performing intra 4×4 mode selection when encoding a current macroblock, wherein said performing step comprises the steps of:
- selecting an intra 16×16 mode;
- if the rate distortion cost of the selected intra 16×16 mode is less than a pre-defined threshold, selecting an intra 4×4 mode from only a first subset of intra 4×4 modes, and selecting a second subset of intra 4×4 modes for testing, based on which of the intra 4×4 modes of the first subset had a lowest cost.
Dependencies are inferred from the claim text.