Dynamic selection of field/frame-based mpeg video encoding

Details Dynamic selection of field/frame-based mpeg video encoding Dynamic selection of field/frame-based mpeg video encoding

H - Electricity

04

N

H04N 7/50 (2006.01)

Patent

CA 2415636

A discrete cosine transform (DCT) level enhancement to Motion Picture Experts Group (MPEG) video encoding is described that results in a more concise bitstream than MPEG encoding without the enhancement. One degree of freedom provided by the MPEG encoding specifications is whether a frame- or field- based DCT operation will be used. In the field-based DCT operations, luminance sub- blocks are built from even or odd rows of the original image, which correspond to the top and bottom fields in field-based video. This allows the encoder to take advantage of the higher correlation between rows for the same field, especially in field-based video with a high level of motion. In one embodiment, both field- and frame-based DCT operations are performed and the results are quantized. On a macroblock-by-macroblock basis, the option that results in the fewest non-zero coefficients is selected and those coefficients ire used for run-time encoding.

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