Video and graphics system with video scaling
AssigneeBroadcom Corporation
InventorsAlexander MacInnis, Chengfuh Jeffrey Tang, Xiaodong Xie, Vivian Hsiun
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Abstract
A video and graphics system has a reduced memory mode in which video images are reduced in half in horizontal direction during decoding. The video and graphics system includes a video decoder for decoding MPEG-2 video data. The video images may not be downscaled in the horizontal direction when no bi-directionally predicted pictures are used. The video and graphics system may output an HDTV video while converting the HDTV video and providing as another output having an SDTV format or another HDTV format. The output having an SDTV format may be recorded using a video cassette recorder (VCR) while the HDTV video is being displayed.
Claims20
A video decoding system for decoding MPEG-2 video data, comprising:
- means for reconstructing the video data to generate a plurality of pictures;
- and
- means for downscaling one or more of the plurality of pictures horizontally, wherein the one or more of the plurality of pictures are downscaled horizontally when the system detects a bi-directionally predicted picture.
A video decoding system for decoding MPEG-2 video data comprising:
- a reconstruction stage that reconstructs the video data to generate a plurality of pictures;
- and
- a downscale filter that downscales one or more of the plurality of pictures horizontally, wherein the one or more of the plurality of pictures are downscaled horizontally when the system detects a bi-directionally predicted picture.
A method of decoding MPEG-2 video data, comprising:
- decoding, at least one electronic circuit, the video data to generate a plurality of pictures;
- and
- downscaling, using the at least one electronic circuit, one or more of the plurality of pictures horizontally, wherein the one or more of the plurality of pictures are downscaled horizontally when detecting a bi-directionally predicted picture.
Dependencies are inferred from the claim text.