ABSTRACT
As we have shown in Chapter 3 and Chapter 4, many techniques have been proposed for tone mapping and luminance expansion. With such a large number of techniques, it is useful to understand the relative merits of each. As a consequence, several methodologies have now been put forward that evaluate and compare the variety of approaches. Evaluation of the techniques provides a better understanding of the relationship between an operator and the image attributes. This can help in the development of operators more suited to a particular application-for example, an improved method for highlighting those parts of an image that are perceptually important to the HVS of a colorblind viewer. Evaluation methods may be classified as:
• Psychophysical experiments. In this case (large) user studies are performed to visually compare images. This typically involves comparing a ground truth image with the output result of a particular technique.
