Introduction - If you have any usage issues, please Google them yourself
Homomorphic filtering noise, the frequency filter and the gradation conversion processing method combining an image, which relies on image intensity/reflectance model as the basis for the frequency domain, using the luminance range compression to improve the quality and increase the contrast of the image . With this image processing method can make the luminance response of the human eye is found in the nonlinear characteristic, avoid the direct Fourier transform processing on the image distortion.