A joint global and local tone mapping algorithm for displaying wide dynamic range images

In this paper, we introduce an efficient improved tone mapping algorithm that can be used for displaying wide dynamic range (WDR) images on conventional display devices that are mainly of low dynamic range (LDR). That algorithm, which enhances the exponent-based tone mapping algorithm of Ofili et al., uses both local and global image information for improving the contrast and increasing the brightness of images. It also directly operates on the Bayer domain instead of the luminance/chrominance domain that is used by the vast majority of tone mapping algorithms. Experimental results performed on different WDR images show that we are able to get images that are more pleasant visually when compared to nine other tone mapping algorithms. These observations are also confirmed numerically through the use of the TMQI, an objective image quality measure.