翻译了！！！谢谢了

Digital image processing is called the computer imagery processing, it is refers the image signal transforms the digital signal and carries on using the computer to it processing the process.Now already was widespread applies in the remote sensing, the universe observation, the image medicine, the correspondence, the pattern recognition and so on many kinds of industry domain. The image filter are in the image pretreatment an application quite widespread technology, its function is in order to enhance image the signal-to-noise ratio, prominent image expectation region.This article based on the MATLAB platform, the use image toolbox function, has carried on a more thorough analysis to the image air zone and the frequency range each filter method. This article main research work includes: (1) uses filter methods and so on value filter, average value filter, Fourier transformation, separate cosine transformation carries on processing to the image.(2) pair of image air zone and the fr