"Pahup Bilala" on wrote...
| I have got two screenshots on Linux.
| One was taken when screen resolution was 1280x1024, and other was taken when
| screen resolution was 800x600.
| Now how do I make sure that when I compare these two png images, it shouldnt
| report any difference in the images.
|
Resize the larger image to the smaller, then compare.
The error should be reasonably low.
Usally basic comparisions are done with very small thumbnail images.
However it is sensitive to the additions of frames, and or cropping
of one of the images.
It is also difficult to locate images which are at the same scale but
just in different positions within the image. The only solution I can
see for this is to compare an images fourier transform. A fourier
transform comparision is position independant, but not size nor rotation
dependant.
In fact fouier transforms allow you to detect small copies of images
within larger images.
Fourier Transforms are a current work in development, though I have no
idea on what stage it is at, or if it is availabel for general use as
yet.
Anthony Thyssen ( System Programmer ) <[EMAIL PROTECTED]>
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Most Gods throw dice, but Fate plays chess, and you don't find out
until too late that he's been using two queens along!
-- Terry Pratchett, "Interesting Times"
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Anthony's Home is his Castle http://www.cit.gu.edu.au/~anthony/
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