DocumentCode :
1124822
Title :
Computation of Surface Orientation and Structure of Objects Using Grid Coding
Author :
Wang, Y.F. ; Mitiche, A. ; Aggarwal, J.K.
Author_Institution :
Laboratory for Image and Signal Analysis, University of Texas at Austin, Austin, TX 78712.
Issue :
1
fYear :
1987
Firstpage :
129
Lastpage :
137
Abstract :
In this correspondence, algorithms are introduced to infer surface orientation and structure of visible object surfaces using grid coding. We adopt the active lighting technique to spatially ``encode´´ the scene for analysis. The observed objects, which can have surfaces of arbitrary shape, are assumed to rest on a plane (base plane) in a scene which is ``encoded´´ with light cast through a grid plane. Two orthogonal grid patterns are used, where each pattern is obtained with a set of equally spaced stripes marked on a glass pane. The scene is observed through a camera and the object surface orientation is determined using the projected patterns on the object surface. If the surfaces under consideration obey certain smoothness constraints, a dense orientation map can be obtained through proper interpolation. The surface structure can then be recovered given this dense orientation map. Both planar and curved surfaces can be handled in a uniform manner. The algorithms we propose yield reasonably accurate results and are relatively tolerant to noise, especially when compared to shape-from-shading techniques. In contrast to other grid coding techniques reported which match the grid junctions for depth reconstruction under the stereopsis principle, our techniques use the direction of the projected stripes to infer local surface orientation and do not require any correspondence relationship between either the grid lines or the grid junctions to be specified. The algorithm has the ability to register images and can therefore be embedded in a system which integrates knowledge from multiple views.
Keywords :
Cameras; Glass; Grid computing; Image reconstruction; Interpolation; Layout; Noise shaping; Shape; Surface reconstruction; Surface structures; Active sensing; grid coding; image registration; scene representation; surface interpolation; surface orientation; surface reconstruction;
fLanguage :
English
Journal_Title :
Pattern Analysis and Machine Intelligence, IEEE Transactions on
Publisher :
ieee
ISSN :
0162-8828
Type :
jour
DOI :
10.1109/TPAMI.1987.4767878
Filename :
4767878
Link To Document :
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