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in a slightly dif- 
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ant. This differ- 
um difference. 
a two similarity 
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ultiplied by its 
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th, midpoint co- 
shown in Figure 
tic system for 
es edge based 
test the feasi- 
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raight lines 
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ving and points 
function is cal- 
nd points coor- 
ure between the 
ter vision, prin- 
al image pro- 
. Experiments 
g. Eng. and Re- 
Matchinstraight 
processing 
; Feature Extrac- 
lage proc. 
ig John wiely 
996 
- Sahoo P., saftani S., Wong A. and chen y., 1988. Asur- 
vey of thresholding techniques Computer Vision. graph 
and image processing, Vol 44 PP.233-260. 
-Toth C. and schenk T.,1992 Fedurebased matching for 
outomaticreyistrat ITC journal PP.40-46. 
of 
EN 
  
Figure (4) edge map : 
a) Using Roberts operator 
b) Using Sobel 
c) Using Prewitt operator 
d) Using Wallis operator 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B3. Vienna 1996