Subjectively-rated image databases have become increasingly popular in the evaluation of image quality measurement
algorithms. Several groups recently have improved their metrics' performance in matching these databases, using
particular HVS (human visual system) properties or image statistical models. However, it is difficult to know whether
these improvements are due to progress towards mimicking the perceptual properties, or are due to matching some
characteristics of the databases. This paper demonstrates an inherent limitation in using such databases, showing that our
very simple metric, built on the contrast masking effect, is able to perform as good as many state-of-the-art metrics. It is
also argued that existent databases neither contain enough images with particularly biased distortions to test the
significance of single HVS property, nor cover diverse distortion types to reflect the requirement of emerging
applications.
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