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. Author manuscript; available in PMC: 2013 Apr 1.
Published in final edited form as: J Vis. 2009 Sep 4;9(10):1.1–119. doi: 10.1167/9.10.1

Figure 6.

Figure 6

Illustration of local contrast estimation. (a) A typical frame from one of our movies. A Gaussian weighted function was used to compute the local mean luminance and local standard deviation that were used to estimate local rms contrast. (b) Local rms contrast computed this way for (a). The gray level of each pixel corresponds to the local contrast at that point, see scale bar. (c) The distribution of rms contrast in 75,000 movie frames. The standard deviation of the Gaussian was 720 pixels (1 cycle/image, filled diamonds), 360 (filled triangles), 180 (filled circles), 90 (filled squares), 45 (open diamonds), 22.5 (open triangles), 11.25 (open circles), or 5.125 (open squares).