lorenzo del caldo

Hi Frans, we found ourselves coming back to this issue once again. We are now using rectangular and square slits in front of a light source to generate strong edges (four edges) in the acquisition for MTF computation. Please in the attached images two screenshots of typical acquisition for MTF measurement using these two targes. With the rectangular slit, horizontal and vertical edges can be discriminated by their length, but this is no longer possible with the square target. For this reason, we...

Hi Franz, we really missed the additional data on the edge corner in the edge_mtf file. it's straight forward this way. thanks a lot, Lorenzo.

p.s. we are aware that your code is able to discriminate between sagittal and meridional edges, but also on that we could not understand how it is done. but it could be added to the discussion since honestly, it could possibly be even more useful than horizontal and vertical discrimination. we're providing here one of our test images on which we're trying to compute the mtf. to explain the problem we found that our optical system has some different astigmatism in the two directions. we then use a...

hello, we're using the software for mtf measurement on an SFRplus chart provided by IMATEST. we would need to be able to discriminate between horizontal and vertical edges but we are having a hard time in understanding how to do it from the output data and if it is even possible. Basically we're looking at the "slanted edge orientation" angle and the "edge orientation relative to radial line to centre" angle, as they are called in the output file "edge_sfr_values.txt". about the first one: as far...