Figure 1
From: An image processing approach to computing distances between RNA secondary structures dot plots
Dot plot subtraction. The test case demonstrating the effect of image subtraction for measuring the distance between two dot plots shows a non-desirable result. Although containing a similar secondary structure, the subtraction of the right dot plot from the left dot plot yields a high number of pixels in the resultant image, which translates to a large distance instead of the desired zero distance. At best, when a cut-off for the intensity of one of the secondary structures is used when subtracted from the other, we remain with the pixels belonging to the other structure that appears intact.