Figure 5
From: Determining optimal medical image compression: psychometric and image distortion analysis
Normalized average pixel error across the range of JPEG Q values. Total difference pixel gray values were determined for the range of JPEG Q values from 1 to 99 by subtracting away the original JPEG Q = 100 image and measuring the total value of all difference pixels for each subtracted image. Measurements were averaged after normalization to the maximum difference value for a given difference image stack. The mean normalized pixel difference is shown as a solid black curve flanked by the +/− standard deviation of the mean in solid gray curves.