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Extended Block-Lifting-Based Lapped Transforms
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DOI：10.1109/LSP.2015.2422837.png)
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摘要
En 中文
We extend an original lapped transform (LT) and use block-lifting factorization to get an extended block-lifting-based LT (XBL-LT). The block-lifting structure maps integer input signals to integer output signals and results in a reversible transform that reduces rounding errors by merging many rounding operations. Although other such block-lifting-based LTs (BL-LTs) have been proposed, they are forcibly constrained by the use of discrete cosine transform (DCT) matrices. In contrast, XBL-LT is DCT-unconstrained and hence also embodies the DCT-constrained form. Furthermore, it has fewer rounding operations by merging the scaling factor with block-lifting coefficients. The both DCT-constrained and unconstrained XBL-LTs perform well at lossy-to-lossless image coding which has scalability from lossless data to lossy data.
Keyword:
Block-lifting structure
lapped transform (LT)
lossy-to-lossless image coding
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9.6
论文数:
1.1W
被引数:
1.7W
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