The Generalized Gabor Scheme of Image Representation in Biological and Machine Vision
IEEE Transactions on Pattern Analysis and Machine Intelligence
Requantization for transcoding of MPEG-2 intraframes
IEEE Transactions on Image Processing
Recompression of JPEG images by requantization
IEEE Transactions on Image Processing
Quantizer offset selection for improved requantization transcoding
Image Communication
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Real-time multimedia applications often require efficient bit-rate reduction. This is mainly done by requantization, usually in the DCT domain. This work introduces theoretical rate-distortion analysis that allows for straightforward selection of the quantization step needed to achieve a given bit-rate. The analysis is based on the Laplace-like distribution of DCT coefficients in the transform domain and on the structure of the quantizers commonly used in image coding. We show that the proposed transcoding design achieves efficient compression at relatively low distortion, while keeping the computational complexity very low, allowing for real-time implementation.