environment. In some instances, the user was required to learn a new operating system 
and manuals with thousand and more pages had to be used frequently to gain some 
understanding in the structure of the software. Today, however, users want to be 
quickly familiar with the system, especially when they are used to work with 
Macintoshes or operating windows. The Dirigo user interface adheres strictly to the 
Macintosh interface guidelines and all but limits typing to only a few occasions (e.g., 
class names or coordinates). The Dirigo interface makes use of pull-down menus and 
dialog boxes (Figure 2). 
dirigo 
The Image Processing System 
For the Rest of Us 
Project Supervision: 
Project Coordination: 
Manfred Ehlers 
Jeffrey Jackson 
User Interface Design: 
£ 
Data Structures: 
File Transfer: 
Jeffrey Jackson 
Jeffrey Jackson 
R. Michael White 
Paul Haggerty 
Gayle Surrette 
R. Michael White 
J. Chris Winne 
File I/O: 
Jeffrey Jackson 
David Pullar 
Geometric Correction: 
Erik Lange 
David Steiner 
Mike Zhao 
Department of S urveying 
Engineering 
University of Maine 
Classification: 
Image Enhancement: 
Paul Haggerty 
Gayle Surrette 
J. Chris Winne 
Jeffrey Jackson 
David Pullar 
©1989 by University of Maine 
Department of Surveying Engineering 
all rights reserved. 
Hardcopy Output: 
Flying Dutchman: 
R. Michael White 
Malcolm Fuller 
Figure 1: Dirigo components and design teams 
Figure 2: The Dirigo menu for Gaussian histogram fitting