Abstract:the image with LCD screen taken by camera is easy to be affected by the illumination or the display problem of the screen itself. The image quality is low and it is difficult to distinguish the information in the screen. When using the traditional Retinex algorithm for image enhancement, there will be halo phenomenon due to uneven illumination. In order to solve this problem, this paper proposes to use homomorphic filtering to correct the illumination, and then use Retinex algorithm to enhance the image after the illumination correction, which can avoid the halo phenomenon. The experimental results show that this method can effectively improve the visual effect of low illumination LCD screen image, which is better than the traditional retinex algorithm