Low-complexity spatial downscaling video transcoder and method thereof
First Claim
1. A low-complexity spatial downscaling video transcoder, comprising:
- a decoder having a reduced discrete cosine transform motion compensation (DCT-MC) unit, said decoder receiving incoming bit-streams, using said reduced DCT-MC unit to integrate DCT-domain motion compensation and downscaling operations into a reduced-resolution DCT-MC for B or P frames in MPEG standard, performing reduced-resolution decoding, generating an estimated motion vector, and performing full-resolution decoding for I-frames in MPEG standard;
a DCT-domain downscaling unit outputting downscaling results of the decoded I-frames for encoding; and
an encoder receiving said estimated motion vector and the downscaling results from said DCT-domain downscaling unit, determining encoding modes and outputting encoded bit-streams.
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Abstract
A low-complexity spatial downscaling video transcoder and method thereof are disclosed. The transcoder comprises a decoder having a reduced DCT-MC unit, a DCT-domain downscaling unit, and an encoder. The decoder performs the DCT-MC operation at a reduced-resolution for P-/B-frames in an MPEG coded bit-stream. The DCT-domain downscaling unit is used for spatial downscaling in the DCT-domain. After the downscaling and the motion vectors re-sampling, the encoder determines the encoding modes and outputs the encoded bit-stream. Compared with the original CDDT, this invention can achieve significant computation reduction and speeds up the transcoder without any quality degradation.
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Citations
17 Claims
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1. A low-complexity spatial downscaling video transcoder, comprising:
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a decoder having a reduced discrete cosine transform motion compensation (DCT-MC) unit, said decoder receiving incoming bit-streams, using said reduced DCT-MC unit to integrate DCT-domain motion compensation and downscaling operations into a reduced-resolution DCT-MC for B or P frames in MPEG standard, performing reduced-resolution decoding, generating an estimated motion vector, and performing full-resolution decoding for I-frames in MPEG standard; a DCT-domain downscaling unit outputting downscaling results of the decoded I-frames for encoding; and an encoder receiving said estimated motion vector and the downscaling results from said DCT-domain downscaling unit, determining encoding modes and outputting encoded bit-streams. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A low-complexity spatial downscaling video transcoding method, comprises the following steps:
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(a) receiving incoming bit-streams, using a reduced discrete cosine transform motion compensation (DCT-MC) unit to integrate DCT-domain motion compensation and downscaling operations into a reduced-resolution DCT-MC for B or P frames in MPEG standard, performing reduced-resolution decoding, generating an estimated motion vector, and performing full-resolution decoding for I-frames in MPEG standard; (b) outputting downscaling results of the decoded I-frames for encoding; and (c) receiving said estimated motion vector and the downscaling results from said DCT-domain downscaling unit, determining encoding modes and outputting encoded bit-streams. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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Specification