Image analysis – Image compression or coding – Interframe coding
Patent
1996-11-21
2000-10-31
Couso, Jose L.
Image analysis
Image compression or coding
Interframe coding
G06K 936
Patent
active
061414476
ABSTRACT:
Compressed video transcoding apparatus and methods are disclosed. One embodiment eliminates the need for reorder buffers by utilizing an encode order video decoder which decodes a first compressed video bit stream to provide a sequence of frames in an encode order suitable for direct encoding without further reordering. An encode order video encoder receives the sequence of frames in encode order and directly encodes the frames without further reordering to provide a second compressed video bit stream. Another embodiment utilizes a frame reorder device to reorder compressed frames of a first compressed video bit stream into an encode order such that a subsequent encoding operation after decoding the first compressed video bit stream can be performed without further reordering of the frames. The reordered compressed frames are decoded and applied in the encode order to an encoder which encodes the frames to provide a second compressed video bit stream. Another embodiment includes a decoder which decodes a first compressed video bit stream to provide a sequence of decoded frames. The sequence of decoded frames is applied to an encoder along with auxiliary information regarding the first compressed video bit stream. The encoder utilizes the auxiliary information to simplify encoding of the decoded frame sequence. The auxiliary information may include motion vectors, quantization scale, number of bits used, motion compensation mode and repeat field indications for the first compressed video bit stream.
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Linzer Elliot N.
Wells Aaron
C-Cube Microsystems Inc.
Couso Jose L.
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