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Random access to high quality regions of interest (ROI) from compressed bit streams of large images is becoming a necessary feature in many applications, particularly in viewing important areas within larger images. We have developed a completely new multi-rate image subband coding scheme using backward coding of wavelet trees (BCWT), which is fast, memory-efficient and resolution-scalable, while...
A new multirate image subband coding scheme for backward coding of wavelet trees (BCWT) is presented. Fully utilizing the multirate characteristic of wavelet subband decomposition, BCWT inherently provides resolution-scalability for resolution-progressive decoding. With the proposed coding scheme, BCWT can also be adjusted to provide rate-scalability for quality-progressive decoding. More importantly,...
A new video codec based on three-dimensional wavelet subband coding with 3-D BCWT (backward coding of wavelet trees) is presented. This new video codec has identical PSNR performance to the well-known 3-D SPIHT video codec. However, it is computationally more efficient and uses significantly less internal memory than 3-D SPIHT. Implementation results of 3-D BCWT show that it can achieve real time...
Backward coding of wavelet trees (BCWT) is a new approach for encoding images in the wavelet domain. This new approach starts coding from the lowest level and goes backward by building a map of maximum quantization levels of descendants. BCWT eliminates several major bottlenecks of existing wavelet-tree-based codecs, namely tree-scanning, bitplane coding and dynamic lists management. It also encodes...
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