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ITU Journal: ICT Discoveries

The ITU Journal: ICT Discoveries publishes original research on ICT technical developments and their policy and regulatory, economic, social and legal dimensions. It builds bridges between disciplines, connects theory with application, and stimulates international dialogue. This interdisciplinary approach reflects ITU’s comprehensive field of interest and explores the convergence of ICT with other disciplines. It also features review articles, best practice implementation tutorials and case studies. The ITU Journal welcomes submissions at any time, on any topic within its scope.

English

A Study of the Extended Perceptually Weighted Peak Signal-to-noise Ratio

Abstract – Fast and accurate estimation of the visual quality of compressed video content, particularly for quality-of-experience (QoE) monitoring in video broadcasting and streaming, has become important. Given the relatively poor performance of the well-known peak signal-to-noise ratio (PSNR) for such tasks, several video quality assessment (VQA) methods have been developed. In this study, the authors’ own recent work on an extension of the perceptually weighted PSNR, termed XPSNR, is analyzed in terms of its suitability for objectively predicting the subjective quality of videos with different resolutions (up to UHD) and bit depths (up to 10 bits/sample). Performance evaluations on various subjective-MOS annotated video databases and investigations of the computational complexity in comparison with state-of-the-art VQA solutions like VMAF and (MS-)SSIM confirm the merit of the XPSNR approach. The use of XPSNR as a reference model for visually motivated control of the bit allocation in modern video encoders for, e. g., HEVC and VVC is outlined as well.

English

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