compress image file是什么意思

应该是选择压缩比例。下面还有NO，FAST，HIGH。NO是为不压缩，FAST为基本压缩，HIGH为高压缩。我们一般选择FAST基本压缩。

The concise Fourier transformation& DCT ( discrete cosine transformation) is a common tool to compress image and video.

图像和视频压缩中最常使用的工具是一种简化了的Fourier变换&DCT变换。

It uses wavelet and fractal to compress image and compare its compression result. Then sum-up what is fit for wavelet and fractal compression.

本课题就是针对上述问题，通过小波变换和分形这两种方法来进行图像压缩，对比起压缩效果，总结出分别适合于小波和分形压缩的图像。

Use the GHM Multiwavelets as an example to compress image after it through Prefilter, compare its result with wavelet\'s.

以GHM多小波为例，将多小波通过前滤波后用于图像压缩，并将其结果与单小波相比较，获得较好的结果。