[SOLVED] How to compare two images?

[Leon]

I want to compare 2 images to find out if they are the same pixel by pixel..

so 1st thought was to compare them pixel by pixel with "QImage::pixel":http://doc.qt.digia.com/stable/qimage.html#pixel-2
2nd to use the "scanLine":http://doc.qt.digia.com/stable/qimage.html#scanLine

is there any other way?

[sidewinder]

What about "QImage::operator==":http://doc.qt.digia.com/stable/qimage.html#operator-eq-eq ?

[Code_ReaQtor]

There is another way I heard of... "Perceptual Hash":http://phash.org/ , but never tried it. In any way, pixel by pixel or scanline might be problematic if the size of the 2 images are not the same or the color was modified in any way (e.g. losses).

[andre]

Or you just do a memcmp on the data representing each image.

[Leon]

[quote author="sidewinder" date="1360841983"]What about "QImage::operator==":http://doc.qt.digia.com/stable/qimage.html#operator-eq-eq ?[/quote]

Works perfectly and takes only 4 milleseconds to compare 2 images of 300 kb :)
Thank u!