Exposure Correction

The problem of the proper exposure settings for image acquisition is of course strictly related with the dynamic range of the real scene. In many cases some useful insights can be achieved by implementing ad-hoc metering strategies. Alternatively, it is possible to apply some tone correction methods that enhance the overall contrast of the most salient regions of the picture. The limited dynamic range of the imaging sensors doesn’t allow to recover the dynamic of the real world. In this Chapter we present a brief review of automatic digital exposure correction methods trying to report the specific peculiarities of each solution. Starting from exposure metering techniques, which are used to establish the correct exposition settings, we describe automatic methods to extract relevant features and perform corrections.