Seven Challenges in Image Quality Assessment: Past, Present, and Future Research

Figure 7

Relative threshold elevations for each of the 14 masks used in [64]. All masks were matched in RMS contrast (values of 0.32 and 0.64 were tested). The data points denote relative threshold elevations averaged over all subjects; error bars denote standard deviations of the means over subjects. The dashed lines denote average relative threshold elevations for each of the three image types. The images depicted on the horizontal axis have been ordered by eye to represent a general transition from simplistic edge to complex texture (from left to right). Indeed, notice that the data generally demonstrate a corresponding left-to-right increase in relative threshold elevation.