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- W2007079126 abstract "The JPEG XR image compression standard, originally developed under the name HD-Photo by Microsoft, offers the feature of spatial variably quantization; its codestream syntax allows to select one out of a limited set of possible quantizers per macro block and per frequency band. In this paper, an algorithm is presented that finds the rate-distortion optimal set of quantizers, and the optimal quantizer choice for each macro block. Even though it seems plausible that this feature may provide a huge improvement for images whose statistics is non-stationary, e.g. compound images, it is demonstrated that the PSNR improvement is not larger than 0.3 dB for a two-step heuristics of feasible complexity, but improvements of up to 0.8 dB for compound images are possible by a much more complex optimization strategy." @default.
- W2007079126 created "2016-06-24" @default.
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- W2007079126 date "2010-01-01" @default.
- W2007079126 modified "2023-10-01" @default.
- W2007079126 title "Spatial Constant Quantization in JPEG XR is Nearly Optimal" @default.
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- W2007079126 doi "https://doi.org/10.1109/dcc.2010.14" @default.
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