BSSE processing of synthetic caliber patterns. (a) Left to right, simulated raw image (left, IRaw), intermediate background-suppressed image (middle, IBF), and the final BSSE-processed image (right, IBSSE). (b) Intensity profiles of the images IRaw, IBF and IBSSE along the corresponding line in (a). The solid red lines in (b) denote the ground truth of the line positions of the pattern. The intervals between the two nearby lines start at 1 pixel and are constantly increased by 1 pixel from left to right. The two lines separated by 3 pixels were resolved in the image IBSSE but not in the images IRaw and IBF.