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TITLE:UQI (Universal Quality Index) [[ImageQualityAssessment]] > [[UQI]] > [[SSIM]] Wang–Bovik Index * SSIM [#y676e357] - https://www.cns.nyu.edu/pub/eero/wang03-reprint.pdf > The “universal quality index” (UQI) defined in [6] and [7] corresponds to the special case that , which produces unstable results when either or is very close to zero. The “universal quality index” (UQI) defined in [6] and [7] corresponds to the special case that C_1=C_2=0 , which produces unstable results when either (μ_x^2+μ_y^2) or (σ_x^2+σ_y^2) is very close to zero. |