Video quality assessment (VQA) is the academic name for the field that studies how to quantify perceived video quality, spanning both subjective methods, where humans rate clips, and objective methods, where an algorithm computes a score. In practice the two are tightly linked: subjective testing produces the ground-truth Mean Opinion Score, and objective metrics are built and graded by how closely their output tracks that score, using statistics such as the Pearson and Spearman correlations and RMSE defined in ITU-T P.1401. The catch is that the term covers a broad research program, not a single tool, and quality is multidimensional, so no one method answers every case. VQA is the umbrella under which the reference setups, the objective metrics PSNR, SSIM, and VMAF, and the subjective standards P.910 and BT.500 all sit, and it is essentially synonymous with the engineering term video quality measurement.
