A new MSR(Multi-Scale Retinex)enhancement algorithm is proposed which is based on frequency-domain to divide scale, in view of halo phenomenon over enhancement and losing the details of the image in the traditional MSR algorithm. The image is converted to frequency domain and three images are obtained via low-pass, band-pass, high-pass filter respectively of the improved algorithm, then the image characteristics are combined with the influence. Finally, in order to reserve image details and solving the prob...