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SHAPE FROM SHADING AND PHOTOMETRIC STEREO ALGORITHMIC MODIFICATION AND EXPERIMENTS

PRASAD, PARIKSHIT
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1077651032

Abstract Details

2004, MS, University of Cincinnati, Engineering : Electrical Engineering.
Shape from Shading (SFS) is an ill-posed problem as it tries to solve an under-determined system. As a result it is difficult to obtain an accurate and unique solution. It is tough to result in a good estimate using just one input image. Moreover, the image has to be taken with proper placement of light source so as to illuminate most part of the object. Photometric stereo eases this problem by using more than one image taken from different illuminant directions but viewed from the same camera. In this thesis, we analyze Tsai’s linear SFS and Zhang’s Photometric stereo algorithms and modify Zhang’s algorithm to use with two input images having a large angular separation between the illuminants. Zhang’s algorithm is an extension of Tsai’s SFS algorithm to handle several images. It is a form continuous photometric stereo involving cascading SFS. The angular separation between the illuminants of consecutive images is small and the estimated shape is refined with every new image. We modify this algorithm and use it on just two input images with a large angular separation between the illuminants. The test of the modified algorithm on synthetic images have shown improvements and test on real data have also been conducted with acceptable results.
Dr. William Wee (Advisor)
64 p.
Shape from Shading; Photometric Stereo; Shape Reconstruction

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Citations

  • PRASAD, P. (2004). SHAPE FROM SHADING AND PHOTOMETRIC STEREO ALGORITHMIC MODIFICATION AND EXPERIMENTS [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1077651032

    APA Style (7th edition)

  • PRASAD, PARIKSHIT. SHAPE FROM SHADING AND PHOTOMETRIC STEREO ALGORITHMIC MODIFICATION AND EXPERIMENTS. 2004. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1077651032.

    MLA Style (8th edition)

  • PRASAD, PARIKSHIT. "SHAPE FROM SHADING AND PHOTOMETRIC STEREO ALGORITHMIC MODIFICATION AND EXPERIMENTS." Master's thesis, University of Cincinnati, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1077651032

    Chicago Manual of Style (17th edition)

ucin1077651032
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© 2004, all rights reserved.
This open access ETD is published by University of Cincinnati and OhioLINK.