ES 
-————————Ü 
mage 
e either 
  
iny image 
Threshold, 
Tigh 
these 
. image of a 
c range. The 
ement. 
isplay styles 
Ir or 
structures, to 
Table 2: 
Summary of the Operator-Machine Interface Features incorporated into ROICATS 
  
   
  
    
OPERATOR-MACHINE 
INTERFACE 
FEATURE 
Ey 
Multi-Windowed 
Computer Screen 
DESCRIPTION OF FEATURE 
  
The computer monitor screen consists of separate display and message 
areas or windows. The display area allows one or more SAR images, 
ship structures and digitized photos to be viewed at one time. The 
message area provides a listing of the available tools, system status data, 
and information on the displayed images. The presence of multiple 
windows increases the readily available information and thereby improves 
image classification and analysis. 
  
Mouse /Trackball 
Interaction Device 
A computer screen cursor can be moved around using either a mouse or 
trackball and placed at certain strategic locations on the screen for 
selecting tools, and accessing or entering information. This alleviates the 
Operator from the tedious job of typing all information. 
  
Multi-Colour Display 
Use of more than one colour to display the images and alphanumeric 
information can help to highlight or emphasize to the Operator various 
pieces of information. However, the number of colours is limited so as 
not to make the computer screen appear too busy or confusing. 
  
  
hip by 
ed SAR 
ler to 
:cted image, 
| ship in its 
SAR ship 
  
it is either 
set of 
a moving 
than one set 
1ilated 
iired for 
Online Guidance 
An online guidance or HELP feature is useful for describing certain 
attributes of ROICATS (e.g. how to use a tool) and providing guidance 
on what step(s) should be taken to continue with the classification or 
analysis process (e.g. suggest what image feature to search for). 
  
Miscellaneous Features 
  
  
M ———MÀ— —— 
  
  
  
For every Operator input, there is a perceptible response output from the 
computer. Error handling is essential especially in the case of incorrect 
key sequence usage. There should be a consistency of control action, and 
a reduced number of possible control actions. 
  
  
  
STATIC 
MENU 
E  ] 
DISPLAY 
DYNAMIC 
MENU AREA 
— 
SOFTKEYS 
MENU 
  
  
OPERATOR CAN 
DIVIDE DISPLAY INTO 
—————————— = 
  
  
  
  
  
Figure 3 Various computer screen display options. 
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