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. Author manuscript; available in PMC: 2016 Mar 21.
Published in final edited form as: Vision Res. 2015 Feb 19;114:135–141. doi: 10.1016/j.visres.2015.02.003

Figure 1.

Figure 1

CSF Parameterization. The spatial contrast sensitivity function, which describes reciprocal contrast threshold as a function of spatial frequency, can be described by four parameters: (1) the peak gain, max g (2) the peak frequency, max f (3) the bandwidth (fullwidth at half-maximum),b , and (4) the truncated fall-off on the low-frequency side. The qCSF method rapidly estimates the CSF by directly estimating these four parameters.