G'evening Monks!

Alright, so my title is a bit misleading, my apologies. I've been reading the article here on comparing images for similarities, deconstructing it, etc. Now, this script actually works pretty well for comparing images on my local filesystem. However, I'd like to grab the data from an image (whatever that data may be, a hash, etc), and find similar images in a database.

Now, from reading the article on Stonehenge, I would need to store the 48 vectors for each image. Then, when I want to compare an image to images stored in the database, I would need to loop over the 48 vectors of the image from I am comparing, against 48 vectors for each image in my database (i.e., $val += abs($image_to_compare1 .. 48 - $image_from_db1 .. 48). Obviously that is not an efficient way of doing this. I thought about just summing all the values for the vectors for each image, and storing that value in the database; However, the issue is that it's not the sum total of vectors from image A - the sum total of vectors from image B. Rather, it's the absolute value difference of each corresponding vectors in the two images.

Wow, so a long road to my question: What is the best way, using Perl, to take an image and find similar images in a database given a threshold. I'd like to store some sort of value in the database, calculate the value from the image to be compared, and then search for any value in the database that matches within a certain threshold.

P.S., Sorry if I was incoherent. My eyes are trying closing on me as I type this. Must get sleep! :)

In reply to Comparing images to find similar images in a database by walkingthecow

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