Gray image-based exposure estimation method

Aiming at the inadequate or excessive exposure problem existed in the imaging system in the wide-range lighting scene,this paper presents a gray image-based exposure estimation method.On the basis of gray image histogram,this method calculates the average gray,estimates if the effect of exposure is correct by judging the peak gray and if there's zero pixel region on both sides of the gray image.The relation between gray image distribution and exposure effect in the gray image histogram is researched,and the experimental results of exposure images are given by the estimation method,showing that this algorithm can calculate the exposure effect without the support of database,and it has low complexity and is easy to implement.