11 Facts About Video quality

Video quality is a characteristic of a video passed through a video transmission or processing system that describes perceived video degradation.

For many stakeholders in video production and distribution, assurance of video quality is an important task.

Video quality evaluation is performed to describe the quality of a set of video sequences under study.

Objective video quality models are mathematical models that approximate results from subjective quality assessment, in which human observers are asked to rate the quality of a video.

The term “objective” relates to the fact that, in general, Video quality models are based on criteria that can be measured objectively – that is, free from human interpretation.

Objective Video quality models are sometimes referred to as instrumental models, in order to emphasize their application as measurement instruments.

Some models that are used for video quality assessment are simply image quality models, whose output is calculated for every frame of a video sequence.

An overview of recent no-reference image Video quality models has been given in a journal paper by Shahid et al.

Since objective video quality models are expected to predict results given by human observers, they are developed with the aid of subjective test results.

Main goal of many-objective video quality metrics is to automatically estimate the average user's opinion on the quality of a video processed by a system.

Procedures for subjective video quality measurements are described in ITU-R recommendation BT.