This book provides a detailed description of much of the recent work of the Image Processing Group at University College London -- the group which pioneered the successful construction of fully parallel processor arrays. The genesis of the current system, CLIP4, is covered in an introduction which is followed by sections describing the development of parallel algorithms for image processing and the software required for such development. The application of the system to a variety of specific problems in image processing is described, as is further work on hardware and software systems of enhanced capability. The results of this research and development program hold considerable interest for computer scientists, image analysts, artificial intelligence experts, and electronic engineers worldwide.