Large amounts of binary or nominally binary images are handled by humans and computers. Thus it is important with effective interaction as well as processing and storage of binary images.

The thesis contains four separate parts. Automatic input of handdrawn electrical schematics. A method for storage of binary images.The data structure is suitable for applications with large images, where the access to data and storage efficiency are important An algorithm for segmentation of chain-coded objects. The segmentation is accomplished by a parallel, iterative computation of the curvature. A method for generation of straight lines on a square grid. The method is based on structural properties of the discrete straightline.