Figure C. Reduced-resolution HiRISE

Figure C. Reduced-resolution HiRISE
Figure C. Reduced-resolution HiRISE Comparing resolution of original (middle) image degraded 5x (left) and 2x (right); portion of HiRISE image ESP_016875_2265. Most individual boulders remain detectable at 2x reduction but disappear at 5x (or clusters of boulders appear to be single larger objects). Resolution reduction was produced by first binning images 2x or 5x (summing 2x2 or 5x5 pixel areas), then resampling back to the original pixel scale. The original image was acquired with 2x2 binning so most of the PSF is captured in single pixels. To the degree that the original PSF exceeds 1 pixel width, this method underestimates true 2x and 5x reduction in resolution. NASA / JPL-Caltech / UA