Abstract:Aiming at the problem of severe degradation of fog weather image and low contrast

an improved algorithm is proposed . From the point of view of time frequency analysis

the Fourier transform in the homomorphic filtering algorithm is replaced by the fast wavelet transform

and then the wavelet coefficients are processed by the improved filter in the transform domain to achieve the enhanced fog image purpose. The experimental results show that the improved algorithm can effectively correct the fog image illumination

keep the original information of the image is not lost

enhance the contrast of the image

and make the processed image more visible