Sparse geometric image representations with bandelets
IEEE Transactions on Image Processing
The contourlet transform: an efficient directional multiresolution image representation
IEEE Transactions on Image Processing
Convolution-based interpolation for fast, high-quality rotation of images
IEEE Transactions on Image Processing
Context-based adaptive binary arithmetic coding in the H.264/AVC video compression standard
IEEE Transactions on Circuits and Systems for Video Technology
Rate-constrained coder control and comparison of video coding standards
IEEE Transactions on Circuits and Systems for Video Technology
Satellite image compression by post-transforms in the wavelet domain
Signal Processing
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This paper describes a pre-processing for DCT-based coders and more generally for block-based image or video coders taking advantage of the orientation of the blocks. Contrary to most solutions proposed so far, it is not the transform that adapts to the signal but the signal that is pre-processed to fit the transform. The blocks are oriented using circular shifts at the pixel level. Before applying these shifts, the orientation of each block is evaluated with the help of a selection based on a rate-distortion criterion. We show that the insertion of this pre-processing stage in an H.264 coder and applied on residual intra frames can improve its rate-distortion performance.