| 摘要 |
This image compression applies a lossless compression algorithm and a lossy compression algorithm to code the differential value of the adjacent pixels. If lossy algorithm is selected, it codes the differential value of the present pixel and the reconstructed previous pixel. In quantizing the differential value of adjacent pixel components, a variable range of interval of value is predetermined with smaller interval range in values closer to "0" and larger interval range farer from "0". The region with less mean variance, less quantization error will be allowed and the region with larger mean variance, more quantization error is allowed
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