The research on image compression arithmetic is a hotspot, there are many mature algorithms have been applied to practice, however, each of them has its own applicability and limitations.
图像压缩的算法研究是一个热点，有许多成熟的算法已经运用于实践中，但每一种算法都有其适用性和局限性。
The popular lossy-JPEG image compression arithmetic and phase-shifting technology are introduced.
简介了当今流行的JPEG有损压缩技术和相移技术。
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