Re: A "slanted edge" analysis program


"Lorenzo J. Lucchini" <ljlbox@xxxxxxxxxx> wrote in message news:nim_e.699$133.298@xxxxxxxxxxxxxxxxxxxxxxxx
SNIP 
The new archive at
  http://ljl.741.com/slantededge-alpha2.tar.gz
or
  http://ljl.150m.com/slantededge-alpha2.tar.gz
now includes a Windows executable, as well as a test image.

Thanks. Unfortunately I get an error box with:
"This application has failed to start because cygwin1.dll was not found".

SNIP
At
http://ljl.741.com/comparison.gif
there is a a graph showing the MTF calculated both by my program and SFRWin, from the test image included in the archive.

The test image looks a bit odd. It seems like the edge was resized vertically with a nearest neighbor interpolation. The edge pixels look like they are 2 pixels high and 1 pixel wide. The noise in the image is single pixel noise (and has a bit of hardware calibration striping).

It looks strange, and thus produces strange sharpening artifacts if pushed to the limits (deconvolution sharpening with a derived PSF, and a Richardson-Lucy restoration with the same PSF). Nevertheless, the Imatest SFR analysis looks identical to the SFRWin result.

Bart 

.

Relevant Pages

  • Re: A "slanted edge" analysis program
    ... Bart van der Wolf wrote: ... there is a a graph showing the MTF calculated both by my program and SFRWin, from the test image included in the archive. ... The edge pixels look like they are 2 pixels high and 1 pixel wide. ...
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  • Re: ImageMagick Newbie
    ... pixels, 4000/inch to 1200x1800 pixels, 300/inch, ... I got good results with my test image, ... else I should include in the command line? ... You don't really need the "-format JPEG" option, ...
    (rec.photo.digital.slr-systems)