Automation of Local Visibility Improvement for Color Digital Image

Abstract

When acquired image is outputted, information on the original image is often lost because of narrower dynamic range of output device such as printer or CRT display than input device such as digital camera. Accordingly, we proposed a method which corrects local contrast and brightness of the input color image automatically and dosen't make the image information lose. In this method, the input image is divided into some region by LOG filter. After that, optimal conversion curve of each region is constructed toward the intensity ingredient based on Adaptive Histogram Equalization, and then too bright or dark regions are improved automatically. As a result of applying this method to the multiple image, remarkable effect was confirmed for visibility enhancement.