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Mean squared error (mse) and peak signal-tonoise-ratio (PSNR) are the most common methods for measuring the quality of compressed images, despite the fact that their inadequacies have long been recognized. Quality for compressed still images is sometimes evaluated using human observers who provide subjective ratings of the images. Both SNR and subjective quality judgments, however, may be inappropriate for evaluating progressive compression methods which are to be used for fast browsingdoi:10.1109/tmm.2002.802844 fatcat:whonklxbynbnvhu4mpc57p3ada