JPEG 2000: Image Compression Fundamentals, Standards and Practice
JPEG 2000: Image Compression Fundamentals, Standards and Practice
Requantization for transcoding of MPEG-2 intraframes
IEEE Transactions on Image Processing
Recompression of JPEG images by requantization
IEEE Transactions on Image Processing
Mixed architectures for H.264/AVC digital video transrating
Multimedia Tools and Applications
Leveraging the quantization offset for improved requantization transcoding of H.264/AVC video
PCS'09 Proceedings of the 27th conference on Picture Coding Symposium
Requantization transcoding for H.264/AVC video coding
Image Communication
Quantizer offset selection for improved requantization transcoding
Image Communication
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Bit rate adaptation is one of the most important types of video transcoding. In this paper, we investigate certain critical points in the spectrum of rate shaping requests. We show that the selection of quantization step sizes may not have monotonic effects on rate-distortion characteristics in the transcoding sense. In other words, rate-distortion tradeoff for transcoding which operates on an already-compressed source can be different than that for regular encoding which operates on an original source. We show in a generic form that careful selections of the step size can lead to much improved performance for transcoding, especially when comparing to what would have been produced through a direct encoding. We demonstrate this unique rate-distortion characteristic through simulations as well as real transcoding scenario with H.264 sequences.