The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. Vol. XXXVII. Part Bl. Beijing 2008 
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4. CONCLUSION 
In this paper an integrated feature based method for sub-pixel 
image matching has been proposed. During feature extraction 
Harris operator was used to detect the point features, then the 
Forstner operator and the surface fitting method were used for 
sub-pixel orientation. The template matching and conformal 
transform techniques were used for feature matching, and the 
thought of matching principle based on bridge mode method on 
initiate matching points was introduced, to eliminate the low 
precision effect on the following matching points. It shows 
that the method is robust, effective, and suitable for realization 
of automatic image matching from the experiment. 
ACKNOWLEDGEMENTS 
The research has been supported by the National High 
Technology Research and Development Program of China (863 
Program) under grant number 2006AA12Z118. 
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