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Integer wavelet transform (IWT) and IWT-based image coding offer many advantages over traditional wavelet. But coefficient magnitudes of the IWT-image have smaller dynamic change value and worse energy compaction than the first generation wavelet. Those reduce efficiency of IWT-based coding. In this paper, we present a new still image coder based on multiple subbands decomposition and IWT (integer...
Region of Interest (ROI) coding belong to the efficient region-based image compression method and is an important feature of JPEG2000 standard. In this paper, a new ROI coding method is proposed. In the method, we utilize the improved SPECK algorithm instead of EBCOT coding recommended by JPEG2000 to encode all scaled coefficients of ROI and BG. Because coefficient clustering and single quadtree partitioning...
The region of interest (ROI) coding is an important application of region-based still image coding and can encode these significant regions with higher quality than others (background). In this paper, we present a new region-based image coding method called partial subbands maximum bitplanes shift (PSMBShift). The new method applies different scaling strategies for the different frequency subbands...
Using the reversible biorthogonal integer wavelet transform (RB-IWT) for compression of image has many advantages. For example, through the use of appropriate techniques, a lossless decoding image can be reconstructed. This point is very significant for medical and remote sensing image processing. However, the RB-IWT has low lossy image compression efficiency. The main reason is the image coefficients...
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