This site contains ground truth data for biomedical images to help develop algorithms to automatically extract information from the printed page. There is also a visual tool and analysis tool called Rover to aid researchers with their algorithms. http://marg.nlm.nih.gov/index2.asp
Survey of non-photorealistic rendering (NPR) for computer graphics and animation: painterly rendering, toon shading, painterly image processing, and simulation of traditional artistic media. http://www.red3d.com/cwr/npr/
Algorithm allows accurate encoding and decoding of 1786 levels of grey within a 24-bit image; text overview, sample images, and a Java test program can be found at this site. http://r0k.us/graphics/pseudoGrey.html
Contains sources for graphical algorithms to draw lines. Included are the popular Bresenham algorithm, the Wu's Symmetric Double-Step, and the fastest non-cpu dependent algorithm, the Extremely Fast Line Algorithm (EFLA). http://www.edepot.com/algorithm.html