Fast and high-quality regional histogram equalization

In this paper, we propose a novel adaptive histogram equalization method. In our proposed method, an image is divided into several blocks and histogram equalization (HE) is performed for each block. We utilize dynamic range separate histogram equalization (DRSHE) for each block and realize quasi-regional histogram equalization. Experimental results indicate that the performance of our proposed method is very similar to that of the Retinex method, whereas the computation time is much smaller than that of the Retinex method.