Low-light-level image enhancement based on fusion and Retinex

Image enhancement, which aims at improving the contrast of low-light-level image and shows the details in the dark, is a widely used technology. When traditional multi-scale retinex (MSR) is used for low-light-level image enhancement, enhancement result will be over-enhanced and the so-called halo will occur. In order to overcome this shortcoming, the result of MSR needs to be further processed. First, MSR result and low-light-level image are fused with weight related to the grey value of the pixels. The result shows that the halo is significantly suppressed, but the brightness of the image is low. Thus, we fuse the image again and take the fusion image which fuses the first step result with the MSR result as the final result. Experimental results show that the proposed algorithm can suppress the halo and preserve the details.