Improving precision of objective image/video quality meters

Although subjective test is the most accurate image/video quality assessment tool, it is extremely time demanding. In the past two decades, a variety of objective quality measuring tools, such as SSIM, IW-SSIM, SPSIM, FSIM, etc., have been devised, that well correlate with the subjective tests results. However, the main problem with these methods is that they do not discriminate the measured quality well enough, especially at high quality range. In this article we show how the accuracy/precision of these Image Quality Assessment (IQA) meters can be increased by mapping them into a Logistic Function (LF). The precisions are tested over a variety of image/video databases. Our experimental tests indicate while the used high-quality images can be discriminated by 23% resolution on the MOS subjective scores, discrimination resolution by the widely used IQAs are only 2%, but their mapped IQAs to Logistic Function at this quality range can be improved to 9 − 17%, depending on the characteristics of the LF function. Moreover, their precision at low to mid quality range can also be improved. At this quality range, while the discrimination resolution of MOS of the tested images is 23.2%, those of raw IQAs is nearly 8.9%, but discrimination of their adapted logistic functions can be very close to that of MOS. Moreover, with the used image databases the Pearson Linear Correlation Coefficient (PLCC) of MOS with the logistic function can be improved by 2 − 20% as well.