... Up: Science Data Pipelines . ... For this purpose, the ADS has developed Dexter, a Java applet that supports the user in this process. Dexter's basic functionality is to let the user manually digitize a plot by marking points and defining the coordinate transformation from the logical to the physical coordinate system. ... The Recogniser interface, derived from Java's Thread class, defines how classes that try to do automatic feature extraction interact with both DExtractor and ImageWithPoints. ...