Temporally consistent region-based video exposure correction

We analyze the problem of temporally consistent video exposure correction. Existing methods usually either fail to evaluate optimal exposure for every region or cannot get temporally consistent correction results. In addition, the contrast is often lost when the detail is not preserved properly during correction. In this paper, we use the block-based energy minimization to evaluate the temporally consistent exposure, which considers 1) the maximization of the visibility of all contents, 2) keeping the relative difference between neighboring regions, and 3) temporally consistent exposure of corresponding contents in different frames. Then, based on Weber contrast definition, we propose a contrast preserving exposure correction method. Experimental results show that our method enables better temporally consistent exposure evaluation and produces contrast preserving outputs.