Exposure Evaluation Method Based on Histogram Statistics

Aiming at the inadequate or excessive exposure problem existed in the imaging system in a scene where there is no specific background or foreground, this paper presents a histogram-based exposure evaluation method.With analysis of statistics features of histograms in different exposure type images, the third moment about middle gray is used to evaluate the exposure effect.For color images, the histogram is calculated only in the component which holds the largest mean brightness considering of efficiency.Experimental result shows that the proposed method can evaluate the exposure effect without the support of database, and it has low complexity and is easy to implement.