Image Fidelity Metrics: Future Directions

All multimedia signal processing algorithms need suitable fidelity metrics for validating the results. Audio, image, and video are the major signals associated with multimedia, and the researchers rely upon objective metrics rather than subjective metrics due to pragmatic and uneconomic aspects of the latter. This paper analyses the available human visual system (HVS)-based objective fidelity metrics for the image processing, and highlights the inadequacy of the metrics for a special set of images known as region-of-interest (ROI) images and discusses a few research directions in this area.