NDLI: Direct shape reconstruction of 3-D object from monocular shading image

Content Provider	IEEE Xplore Digital Library
Author	Deng Yanping Li Jiegu Lin Sheng Ji
Copyright Year	1993
Description	Author affiliation: Inst. of Image Processing & Pattern Recog., Shanghai Jiaotong Univ., China (Deng Yanping; Li Jiegu; Lin Sheng Ji)
Abstract	The method described in this paper for reconstructing the shape of Lambertain surfaces from the shading information inherent in a monocular image can deal with a surface whose image (a smooth and non-self-occluding one) is produced by orthographic projection with a parallel light source from a known direction. By dividing the image area into serial triangles, the intensity function I(x,y) on each triangle can be linearized. With the help of a support function and a transformation, it is proved that each triangle represents a cylinder in new X-Y coordinates with (s,t) as its surface gradient components. So, the ill-posed image brightness constraint equation in Cartesian coordinates can be solved in X-Y coordinates with only one variable (either s or t). It is necessary to find out, firstly, the pixel which has the maximal intensity, and then assign its depth leads for the direct recovery of the shape at each point, without the necessity of integration.
Starting Page	952
Ending Page	955
File Size	298590
Page Count	4
File Format	PDF
ISBN	0780312333
DOI	10.1109/TENCON.1993.320171
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1993-10-19
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Shape Image reconstruction Brightness Equations Surface reconstruction Light sources Reflectivity Iterative algorithms Image processing Image recognition
Content Type	Text
Resource Type	Article

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