imreg_dft is your first-choice Python image registration utility. In plain language, it implements means of guessing translation, rotation and scale variation between two images. The name comes from the fact that it doesn’t work with those images directly, but it works with their spectrum (DFT using FFT), and its log-polar transformation, hence the _dft after imreg. You can use the functionality in a form of a command-line tool or as a Python module.
Paperwork is a GUI to make papers easily searchable using OCR. The basic idea behind Paperwork is "scan & forget" : You should be able to just scan a new document and forget about it until the day you need it again.
BAUM is a software library for drawing and recognizing new circular barcodes that are designed to be relatively tolerant of linear motion blur. With this library, those circular barcodes can be recognized from video in real time from Full HD videos utilizing a desktop GPU. With BAUM library, all recognition task is executed by an OpenCL device, and thus CPU load is very low if a GPU is used as the OpenCL device.
facedetect is a simple face detector for batch processing. It answers the basic question: "Is there a face in this image?" and gives back either an exit code or the coordinates of each detected face in the standard output. The aim is to provide a basic command-line interface that's consistent and easy to use with software such as ImageMagick, while progressively improving the detection algorithm over time.