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Proceedings of the Symposium on Progress in Data Processing and Analysis

Dirigo Design
The first assignment for the students was to decide on the essential components of an
image processing system. Based on their remote sensing experience, they were to
describe the software components for a digital image processing system designed to
process remotely sensed data. These components should be structured into (a)
absolutely essential; (b) necessary; (c) useful; and (d) "nice to have". The answers were
discussed in class and modified based on these discussions (Table 1).
Table 1: Components of an Image Processing System in Remote Sensing
Absolutely Essential
Display (CRT)
Image File Management
Geometric Correction
* Registration
* Rectification
* Resampling
* Point Operations (LUT)
* Filtering (Spatial)
* Density Slicing
* Supervised
* Unsupervised
* Fast Fourier Transform
* Principle Component Transform
* Intensity-Hue-Saturation Transform
* Linear Combination
* Band Ratio
"Nice To Have"
All The Rest
Teams were assigned to work on the components that were rated as essential and
necessary (Figure 1). One of the most important design considerations was that all
application software was to be accessible through a common user interface that should
strictly adhere to Apple's Macintosh interface guideline. The interface should provide
state-of-the-art interaction based on pull-down menus and use of the mouse wherever
User Interface
Complaints about user interfaces for image processing software packages have ranged
from needlessly cumbersome to non-intuitive to downright cryptic. In the early stage of
image processing, it was assumed that only the experienced user w&able to work with
image processing software, especially with packages originating from the academic