by Peter Sobot (psobot.com) on August 26, 2012. Licensed under MIT.
SmartCrop is a smart JPEG thumbnailing algorithm based on entropy measurements of a sliding window. Based off an algorithm by Michael Macias, SmartCrop was first implemented in Ruby back in April 2012. This solution, however, was dog-slow. (On the order of ~2 seconds per image processed!)
This repo contains three versions of the same basic program:
smartcrop.rb, the original Ruby script using RMagick
fastcrop, using libJPEG, literally 50 times faster than the Ruby version.
smartcrop, using Magick++, which is roughly 6x faster than the Ruby.
Check out the blog post on comparing the three methods.
make, then run
SmartCrop by Peter Sobot ------------------------ Usage: ./smartcrop [-o output_dir] [-d date_from] input_file input_file ... Default output directory is the current directory. Default date from is forever ago.