Does PHP have enough low-layer methods in order to implement an image comparison metric such as SSIM (structural similarity)?
Do you have an SSIM function for PHP? I've been searching but I can't find it. I will try to make it on my own, by converting code from C.
Thank you!
With GD it is theoretically possible to do any image processing that you would do in C (albeit probably rather more slowly). But what I have done in the past is to just write a simple C program to do the processing, and call it from PHP. This usually requires you to save the image to a temporary file, if it exists only in a database, but it allows you to use your existing C code without porting.