Each window allows the full range of algorithms to be applied and the can select areas or points of interest to guide the algorithms. Extract maintains a history of the operations that result in the image in each window. This figure shows a typical extract digitising session.
Here are some features of extract...
The image processing core of extract is provided by the imagelib library of image processing routines. From this point of view, extract can be seen as a graphical user interface to the routines in imagelib. Extract provides an Open Look user interface, although it is currently being enhanced to give a Motif interface and there is some support for a Microsoft Windows interface.
Extract is currently being used and extended by a number of projects so that new areas such as interactive segmentation and texture analysis can be explored. Extract is also being converted into an advanced viewer for the Microcosm distributed multimedia information system.