无损和有损图像压缩算法？ [英] Lossless and lossy image compression algorithm?

问题描述

我正在学习图像处理。我想知道无损和有损图像压缩算法。有人可以给我任何建议吗？非常感谢！

I'm learning about image processing. I want to know about lossless and lossy image compression algorithm. Anybody can give me any suggestions ? Thanks so much!

推荐答案

有损压缩算法在解码时不能提供完美的逐位复制，但它们通常都是实现更小的文件大小。典型的有损格式是JPEG，典型的无损格式是PNG 24位或TIFF。一种更现代的有损格式是JPEG-2000，但它并不常见。

Lossy compression algorithms don't provide a perfect bit-for-bit copy when decoded, but they usually achieve a smaller file size. A typical lossy format is JPEG, and a typical lossless format is PNG 24 bit or TIFF. A more modern lossy format is JPEG-2000, but it is not very common.

有损格式的工作原理是将图像转换为另一个域（用于JPEG的DCT，用于JPEG的小波） 2000）可以限制信息带，对图像的可见性造成的损害最小。

Lossy formats work by transforming the image into another domain (DCT for JPEG, Wavelet for JPEG 2000) where bands of information can be limited with minimal damage to the visibility of the image.

无损格式可能会执行压缩。如果他们压缩，他们使用 LZW 等方法，它们可以提供准确的比特流作为输出作为输入，类似于zip压缩。

Lossless formats may perform compression or not. If they compress they use a method such as LZW which can provide the exact bit stream as output as they were given as input, similar to zip compression.

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