success. Problems remain, mainly in patch 
identification. We will need to revise the definition of 
what makes up a patch in order to pick only those areas 
that clearly are features of the image, and not include 
areas where colour is slowly changing. 
The point matching part of the procedure can be 
improved by first trying only significant points along 
the patch boundary. Then, we expect that limiting the 
search to epipolar lines will remove most of the 
remaining errors in point searching. 
The method will be most useful in cases where camera 
position is known and manual location of ground control 
points in the images is not required. The method is 
intended to eliminate the need for seed points, and with 
further work, this goal seems feasible. 
The work described in this paper has already been 
presented in more detail in a thesis by M. 
Abbasi-Dezfouli, submitted in mid-1995, which led to 
his being awarded a PhD (Abassi, 1995). 
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106 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B2. Vienna 1996 
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