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Complexity-quality analysis of transcoding architectures for reduced spatial resolution

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5 Author(s)
Vetro, A. ; Mitsubishi Electr. Res. Labs., Murray Hill, NJ, USA ; Hata, T. ; Kuwahara, N. ; Kalva, H.
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This paper presents a detailed complexity-quality analysis of various video transcoding architectures that perform spatial resolution reduction. In addition to a reference architecture, two additional architectures are considered. The reference architecture is a cascaded approach that decodes, down-samples and re-encodes the video. The first additional proposal, intra refresh architecture, compensates for various errors by converting select macroblocks to intra-coded blocks. The second proposal, partial encoder architecture, is similar to the reference, but simplifies the re-encoding process by not compensating for re-quantization errors. The optimization of several processing components, including the down-sampling operation, is presented. We have found that the two additional architectures provide a good trade-off in terms of complexity and quality compared to the reference.

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Consumer Electronics, IEEE Transactions on  (Volume:48 ,  Issue: 3 )