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International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B2. Istanbul 2004 
5. Conclusion 
According to the results obtained from various tests done on 
different photos in different pixel size, our suggested method is 
GVC for rough localization and LSM for precise positioning. 
One major problem can occur if older cameras have been used 
for the acquisition of the analogue film images: the fiducial 
center is not as bright as expected. In newer cameras, the 
fiducials are often illuminated by light emitting diods (LEDs). 
Dust and scratches in the images around the fiducials and 
scanning with out proper parameter settings can further 
decrease the quality of the fiducials in the digital image and that 
may lead the algorithm to fail. We use Wiener and constrained 
least square filter as pre-processing techniques to improve the 
accuracy and reliability of the algorithms but we observed no 
affect on accuracy, however, they improve the quality of the 
patches and make them sharper. 
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