### Abstract

This paper describes an approach to reconstructing a shape from it's shaded image in the case where a point light source is at the projection center. This condition well approximates the imaging system of an endoscope. In this case, the image gray level depends on not only the gradient of the object surface but also the distance from the light source to each point on the surface. To deal with this difficulty, we introduce the evolution equation for equal-range contours on the surface. Propagating this contour by solving the equation, we can reconstruct a shape. Experimental results for real medical endoscope images of a human stomach inner wall show feasibility of this method, and present a promising technique for morphological analysis of tumors on human inner organs.

Original language | English |
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Pages | 290-298 |

Number of pages | 9 |

Publication status | Published - 1996 Jan 1 |

Externally published | Yes |

Event | Proceedings of the 1996 Workshop on Mathematical Methods in Biomedical Image Analysis - San Francisco, CA, USA Duration: 1996 Jun 21 → 1996 Jun 22 |

### Other

Other | Proceedings of the 1996 Workshop on Mathematical Methods in Biomedical Image Analysis |
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City | San Francisco, CA, USA |

Period | 96/6/21 → 96/6/22 |

### ASJC Scopus subject areas

- Engineering(all)

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## Cite this

*Shape reconstruction from an endoscope image by shape-from-shading technique for a point light source at the projection center*. 290-298. Paper presented at Proceedings of the 1996 Workshop on Mathematical Methods in Biomedical Image Analysis, San Francisco, CA, USA, .