Also, this article outlines a nice idea of finding "similar" images "simply" by comparing the colour histograms of five areas of the image. This doesn't necessarily find images with the same motives, but it finds images with the same colour composition ("blue sky", "yellow sand"). The linked code is more in Python, but I think the general concepts translate to Perl too, potentially using PDL.

In reply to Re: Comparing images to find similar images in a database by Corion
in thread Comparing images to find similar images in a database by walkingthecow

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