VQMs are intended to provide calculated values that are strongly correlated with viewer subjective assessments. This Recommendation provides: Methods for curve fitting VQM objective values to subjective data in order to facilitate the accuracy calculation and to produce a normalized objective value scale that can be used for cross correlation between different VQMs. An algorithm (based on statistical analysis relative to subjective data) to quantify the accuracy of a given VQM. A simplified root mean square error calculation to quantify the accuracy of a VQM when the subjective data has roughly equal variance across the VQM scale. A method to plot classification errors to determine the relative frequencies of "false tie", "false differentiation", "false ranking", and "correct decision" for a given VQM.
ITU-R BT.1676 FRENCH-2004 history
2004ITU-R BT.1676 FRENCH-2004 Methodological framework for specifying accuracy and cross-calibration of video quality metrics