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ON THE USE OF DEPTHFROMFOCUS IN 3D OBJECT MODELLING FROM MULTIPLE Ning Xu and Narendra Ahuja
 

Summary: ON THE USE OF DEPTH­FROM­FOCUS IN 3D OBJECT MODELLING FROM MULTIPLE
VIEWS
Ning Xu and Narendra Ahuja
Department of Electrical and Computer Engineering and Beckman Institute
University of Illinois at Urbana­Champaign, Urbana, IL61801, USA
ABSTRACT
This paper is concerned with depth estimation from focus
for acquiring 3D models of objects from multiple views.
Depth­from­focus usually involves a single viewpoint but
many different focus settings. Our approach uses multi­
ple viewpoints, but for each viewpoint only two different­
aperture settings, one small, showing the entire visible sur­
face in focus, and the other large, showing only a narrow
depth slice of the object in focus. Since only the aperture
value is changed, the camera needs to be calibrated only
once for each viewpoint. Depth estimate follows directly
for those parts of the image that are in focus in both images
for the same viewpoint. The depth estimates from differ­
ent viewpoints are merged to obtain a complete surface esti­
mate. This estimate serves as the initial estimate for the next

  

Source: Ahuja, Narendra - Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign

 

Collections: Computer Technologies and Information Sciences; Engineering