Divide-and-conquer strategy in shape from shading problem

Seong Ik Cho, Hideo Saito, Shinji Ozawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

13 Citations (Scopus)

Abstract

A divide-and-conquer strategy in shape from shading problem under fully perspective condition is proposed for the information recovery of book surfaces. The whole recovery process is composed of three sequential steps : preprocessing, apparent shape recovery, and ortho-image generation. Pure shade images are extracted at preprocessing step by introducing phenomenological model of interreflection and by removing pigment parts from observed images. Using existing invariances, equations of slope and that of ortho-image being explicit are derived from equation of shading and that of observation being implicit. Recurrence relation is derived from definition of mean slope in discrete image. Theoretically, it become possible to recover unique shape without iteration using derived equations in case of Lambertian cylinder. However, a feed-back shape recovery process is implemented as practical algorithm in order to overcome self-shadows. Results of simulations and real experiments show the properness and acceptability of the proposed strategy and implemented algorithms.

Original languageEnglish
Title of host publicationProceedings of the IEEE Computer Society Conference on Computer Vision and Pattern Recognition
Editors Anon
PublisherIEEE
Pages413-419
Number of pages7
Publication statusPublished - 1997
EventProceedings of the 1997 IEEE Computer Society Conference on Computer Vision and Pattern Recognition - San Juan, PR, USA
Duration: 1997 Jun 171997 Jun 19

Other

OtherProceedings of the 1997 IEEE Computer Society Conference on Computer Vision and Pattern Recognition
CitySan Juan, PR, USA
Period97/6/1797/6/19

Fingerprint

Recovery
Invariance
Pigments
Feedback
Experiments

ASJC Scopus subject areas

  • Computer Vision and Pattern Recognition
  • Software
  • Control and Systems Engineering
  • Electrical and Electronic Engineering

Cite this

Cho, S. I., Saito, H., & Ozawa, S. (1997). Divide-and-conquer strategy in shape from shading problem. In Anon (Ed.), Proceedings of the IEEE Computer Society Conference on Computer Vision and Pattern Recognition (pp. 413-419). IEEE.

Divide-and-conquer strategy in shape from shading problem. / Cho, Seong Ik; Saito, Hideo; Ozawa, Shinji.

Proceedings of the IEEE Computer Society Conference on Computer Vision and Pattern Recognition. ed. / Anon. IEEE, 1997. p. 413-419.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Cho, SI, Saito, H & Ozawa, S 1997, Divide-and-conquer strategy in shape from shading problem. in Anon (ed.), Proceedings of the IEEE Computer Society Conference on Computer Vision and Pattern Recognition. IEEE, pp. 413-419, Proceedings of the 1997 IEEE Computer Society Conference on Computer Vision and Pattern Recognition, San Juan, PR, USA, 97/6/17.
Cho SI, Saito H, Ozawa S. Divide-and-conquer strategy in shape from shading problem. In Anon, editor, Proceedings of the IEEE Computer Society Conference on Computer Vision and Pattern Recognition. IEEE. 1997. p. 413-419
Cho, Seong Ik ; Saito, Hideo ; Ozawa, Shinji. / Divide-and-conquer strategy in shape from shading problem. Proceedings of the IEEE Computer Society Conference on Computer Vision and Pattern Recognition. editor / Anon. IEEE, 1997. pp. 413-419
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