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| From: | Journeaux, Ian |
| Subject: | Differences between imrotate on Octave and in MatLab |
| Date: | Fri, 12 Mar 2010 12:49:42 -0600 |
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I am trying to move some analysis originally performed in
MatLab to Octave. We are using the image processing toolkit. I thought
everything was working correctly but close inspection of the processed images
produced a some differences that I am going to have to deal with. I have an original image. We use imrotate to rotate the
image slightly (1-3deg). The unrotated image has some small distinct white spots
on it that are about 3-5 pixel in size. The white intensity of the several pixels
at the center of the spots are 255 (grayscale images). After processing with
imrotate in Matlab, the shape of the spot is relatively unchanged and the number
of pixels with a grayscale intensity of 255 is slightly smaller. I expected the
image rotation would cause this so I wasn’t surprised. Unfortunately when I do the same operation in Octave, there
are no pixels at 255 and the white spot is significantly smeared and the max
grayscale intensity is only 220-230 range. My analysis procedure is base on the
pixels having a gray scale intensity of 250+ I have some sample images that that illustrate the problem
if that would be helpful. Are the imrotate defaults for Octave the same as for
MatLab? Appreciate any thoughts. Ian Journeaux Manager – Process Technology Phone:
(715)
422-2203
Fax:
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