Study on correlation between deterioration perception threshold and degradation factor/degree of images

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Human beings often cannot feel the same quality images which have same PSNR depend on the kind of images and the kind of deterioration factors. We first define the perceptible degradation limit PSNR which is called Deterioration Perception Threshold (DPT). And we show the Amount of Edge (AOE) which is a simple image feature is correlated with DPT. Next, we investigate the DPT of the same images which are reduced two times from its original size by using ideal half-band filter. The negative linear relation between DPT and AOE of reduced size images is exactly the same as that of original size images. Further, the quality of images can be evaluated by latency and peak height of P300 of the event related potentials (ERP)