Perceptual image comparison
A simple tool that compares images using image hashing techniques
You need just a C compiler with the default libraries, and make
$ aspect compute image.jpg image2.jpg62424443423f3f40444241403f3e3f40 image.jpg68403f40403f40403f40413f3f404040 image2.jpg
$ aspect compare 62424443423f3f40444241403f3e3f40 68403f40403f40403f40413f3f4040400.640625 68403f40403f40403f40413f3f404040
Using the image loader stb_image.h from stb