Reduced-quality resolution digital video encoder/decoder

Details Reduced-quality resolution digital video encoder/decoder Reduced-quality resolution digital video encoder/decoder

1997-03-28

1999-02-09

Lee, Richard

Television

Bandwidth reduction system

Data rate reduction

348408, 348400, H04N 732

Patent

active

058701443

ABSTRACT:
A DV codec process for reduced-quality size decoding of DV encoded video data receives a DV encoded bit stream. Compressed macroblock information and DCT information, including a DC coefficient value, is read for a current DCT block. It is determined whether the current DCT block is a still DCT block. If the current DCT block is a still DCT block, run length decoding is performed to obtain a number of low frequency AC coefficient values for the current still DCT block and a reduced coefficient inverse discrete cosine transform is performed on the low frequency AC coefficient values to yield decoded pixel values for the current still DCT block. If the current DCT block is a motion DCT block, run length decoding is performed to obtain a number of low frequency AC coefficient values for the current motion DCT block and a reduced coefficient inverse discrete cosine transform is performed on the low frequency AC coefficient values to yield decoded pixel values for the current motion DCT block. The codec produces one-quarter size or full-size images.

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patent: 5543845 (1996-08-01), Asamura et al.
patent: 5748795 (1998-05-01), Ohnishi et al.

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