A great introduction to the concept of computer vision and how it can be applied to robotics, I would recommend this for computer vision beginner beginners.
- OpenCV (open Computer Vision) tutorial (An understanding of the C programming language is essential)
An open source computer vision library originally developed by Intel, with a wide variety of applications,
Application areas include (and many more):2D and 3D feature toolkits
Stereopsis Stereo vision: depth perception from 2 cameras
more information? go to OpenCV Wiki
Great book on OpenCV