Video Distortion Method for VMAF Quality Values Increasing.

Video quality measurement takes an important role in many applications. Full-reference quality metrics which are usually used in video codecs comparisons are expected to reflect any changes in videos. In this article, we consider different colour corrections of compressed videos which increase the values of full-reference metric VMAF and almost don't decrease other widely-used metric SSIM. The proposed video contrast enhancement approach shows the metric inapplicability for video codecs comparisons, as it may be used for cheating in the comparisons via tuning to improve this metric values.