Paper Information

Journal:   JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TEHRAN)   May 2003 , Volume 37 , Number 1 (79); Page(s) 75 To 84.
 
Paper: 

AUTOMATIC GENERATION OF A DIGITAL TERRAIN MODEL FROM A SINGLE PERSPECTIVE IMAGE USING THE SHAPE FROM SHADING TECHNIQUE

 
 
Author(s):  HASHEMI BANI L., AZIZI A., SAMADZADEGAN F., HASHEMI BANI M.H.
 
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Abstract: 

In this research work a shape from shading (SFS) technique which incorporates a Lambertian model is implemented for the automatic generation of a digital terrain model (DTM) using a single view aerial image. The developed algorithm is tested on both simulated and real data. The estimated accuracy of the generated DTM from the simulated data, which has a bilinear surface, is about ±3 cm. The real data is a scanned aerial photograph taken over a low texture hilly terrain. The generated DTM by the SFS technique is compared with a DTM acquired by the manual measurement of the stereo image of the same area using a photogram metric plotter. The estimated rimes of the discrepancies between the grid nodes of the measured and the automatically generated DTM is about ±4 meters. The unsuccessful reconstruction of the terrain surface for the real data is due to the fact that a simple Lambertian model does not take into account, in a perfect way, different nondeterministic influential factors such as the terrain alb Edo variations and the random noise. The influence of the latter case was reduced by a low pass filter applied as a preprocessing stage.

 
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