Multiresolution neural network for the fusion of stereo and shape from shading in machine vision

Richard Lepage; Denis Poussart

doi:10.1117/12.131604

1 November 1992 Multiresolution neural network for the fusion of stereo and shape from shading in machine vision

Richard Lepage, Denis Poussart

Proceedings Volume 1826, Intelligent Robots and Computer Vision XI: Biological, Neural Net, and 3D Methods; (1992) https://doi.org/10.1117/12.131604
Event: Applications in Optical Science and Engineering, 1992, Boston, MA, United States

Abstract

A goal of computer vision is the construction of scene descriptions based on information extracted from one or more 2D images. A reconstruction strategy based on a three-level representational framework is proposed. The first representational level, the Primal Sketch, makes explicit important information about the two-dimensional image, primarily the intensity changes and their geometrical distribution and organization. The intensity changes appear at several spatial scales and image analysis performed at multiple resolutions is therefore required. We propose a compact pyramidal neural network implementation of the multiresolution representation of the input images. Features of the scene are detected at each resolution level and feedback interaction is built between pyramid levels in order to reinforce edges which correspond to physical features of the observed scene. The second representational level, the raw 2.5 D Sketch, makes explicit the orientation and rough depth at the edge location of the visible surfaces. A multiresolution neural network stereo algorithm is designed to compute the disparity at each pixel location and at all the resolution levels. Matching is facilitated by a hierarchical focussing mechanism. The third representational level, the full 2.5 D Sketch, makes explicit the orientation and depth estimate at all the visible surface coordinates. Depth information between the edges is computed with a local shape- from-shading algorithm.

Citation Download Citation

Richard Lepage and Denis Poussart "Multiresolution neural network for the fusion of stereo and shape from shading in machine vision", Proc. SPIE 1826, Intelligent Robots and Computer Vision XI: Biological, Neural Net, and 3D Methods, (1 November 1992); https://doi.org/10.1117/12.131604

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