Exposure and Contrast Enhancement for Low Light Images

Abstract

We describe a method for contrast and exposure improvement in low light images taken indoor as well as outdoor. The terms “exposure enhancement” and “contrast enhancement” are usually used interchangeably for image enhancement in low light acquisitions. While exposure can be inferred from low frequency or background of an image, contrast by definition refers to the ratio of the foreground with the background. A fast multiresolution low light enhancement scheme is proposed which is based on Laplacian pyramid, and show how foreground and background at different levels contribute to contrast and exposure enhancement. The proposed method outperforms other method in terms of contrast and exposure enhancement for low light images.