🚀 go-pugleaf

Hi,
I am looking at responses of Gabor filters to ramp edges, something like this:

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Sorry if your font gives something weird, I mean of course an edge defined by a plateau
meeting a ramp.
Quite interesting, but also very complicated analytically. Might give a new explanation of
the Mach band effect. For this I need references to papers about the EXACT POSITION of
incremental and decremental bands, not about increm/decrem thresholds etc.
I found a few papers by Lowry and DePalma, Fiorentini, and also McCollough, but all way
back in the 50- and 60-ties. 
Does someone know whether there exist more recent and perhaps more precise data on
the exact positions of the perceived extrema relative to the edge position? Whether the
extrema are located at the edge or systematically shifted towards the plateau or ramp
side?  And the influence of edge blur (when the ideal ramp edge is blurred by a Gaussian
lowpass filter. This is very important.
Thanks,
Hans