VXL, the Vision-something-Library,' is a collection of open source

Open source

The term open source describes practices in production and development that promote access to the end product's source materials. Some consider open source a philosophy, others consider it a pragmatic methodology...

 C++ libraries for Computer Vision

Computer vision

Computer vision is a field that includes methods for acquiring, processing, analysing, and understanding images and, in general, high-dimensional data from the real world in order to produce numerical or symbolic information, e.g., in the forms of decisions...

. The idea is to replace X with one of many letters, ie. G (VGL) is a geometry library, N (VNL) is a numerics library, I (VIL) is an image processing library, etc. These libraries can be used for general scientific computing as well as computer vision. Some examples of usage can be found at http://apps.sourceforge.net/trac/vxl/wiki/Q%26A