Figure 5.

Variance in the image from Figure 1 at varying spatial resolutions. A, Represents the original image, (B) illustrates a reduction in high-frequency noise without significant loss in resolution. The minimum variance across the image occurs at point (C) at a pixel size that averages the high-frequency noise component without being dominated by low-frequency noise. Point (D) has increased variance due to averaging of low frequency noise components and in point (E), this low-frequency noise is the only feature visible.