1. A method, comprising: partitioning a current input frame and a current degraded frame according to a tile grid, giving rise to a plurality of tile pairs; calculating a quality score for each tile pair giving rise to a plurality of intra-tile quality scores; and applying perceptual weighting to the plurality of intra-tile quality scores, giving rise to perceptually weighted intra-tile quality scores; and pooling the perceptually weighted intra-tile quality scores to compute a quality score for the frame.