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. Author manuscript; available in PMC: 2010 Aug 20.
Published in final edited form as: J Vis. 2010 Feb 24;10(2):23.1–2315. doi: 10.1167/10.2.23

Figure 4.

Figure 4

Illustration of band-pass filtering and spatial distortion. Distortions introduced into the lower left quadrant of (a,b) two typical natural images are easily noticed, but could not be detected in band-pass filtered versions of the distorted image (d,e) at any spatial frequency or distortion frequency tested. However, distortions that are introduced (upper left quadrant) after band-pass filtering (c,f) are easily detected from the presence of spatial frequency artifacts outside the pass-band of the band-pass filtered image.