ANALYTICAL OVERVIEW OF METRICS USED
TO ASSESS THE QUALITY OF MULTIMEDIA INFORMATION
Nina D. Kerentseva
Student, Department of Telecommunications Systems,
Volgograd State University
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Prosp. Universitetsky, 100, 400062 Volgograd, Russian Federation
Aleksandr I. Trofimov
Student, Department of Telecommunications Systems,
Volgograd State University
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Prosp. Universitetsky, 100, 400062 Volgograd, Russian Federation
Abstract. Data quality is an indicator that characterizes any transmitted information
that can be measured. The very word “measure” suggests the evaluation of these data, the
quality of which can be described and quantified. The metric, in turn, is essentially an objective
assessment during testing, which makes it possible to determine data distortions that occur
during transmission, encoding, digitization, compression, and decoding of video data. The article
considers such metrics as PSNR and VQM, and analyzes the ITU-R-BT.500-8.11 standard.
A brief overview of the MSU Video Quality Measurement Tool is presented, as well as a
simulated video conferencing image acquisition using one of the most popular H264 codecs.
The formulas for calculating the PSNR metric, defined through the mean square error (MSE),
estimating the loss of image quality by comparing the received video with the downloaded
(reference video) are presented. The VQM (Video Quality Metric) metric is considered,
which evaluates the distortion in the transmitted video caused by the passage of network
packets through the cable line of the transmission system (decoding errors or coding errors),
as well as methods for subjective and objective evaluation of images in video conferencing.
The advantages and disadvantages of each of the evaluation methods are considered.
Key words: video quality rating, comparison of metrics, video codec comparison,
PSNR, VQM.
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