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Author Grace, A. E. ♦ Pycock, D.
Source CiteSeerX
Content type Text
File Format PDF
Language English
Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science
Subject Keyword Multiresolution Active Contour Model ♦ Surface Texture ♦ Edge Strength ♦ Stereoscopic Road Surface View ♦ Conventional Technique ♦ Smoothness Functional ♦ Traditional Approach ♦ External Constraint ♦ Sparse Range Data ♦ Stereoscopic Image ♦ Place Initial Edge Point ♦ Textured Stereo Image ♦ Internal Constraint ♦ Maximum Likelihood Estimate ♦ Open Active Contour Model ♦ Low Resolution Version ♦ Inherent Texture ♦ 3-d Road Defect ♦ Light Stripe ♦ Intensity Image ♦ Textured Surface
Description In British Machine Vision Conference
This paper presents a method for generating sparse range data from textured surfaces which have structured light projected onto them. The work is motivated by the need to measure 3-D road defects rapidly and reliably. Traditional approaches to computing range from stereoscopic images have replied on either smooth or finely textured surfaces when using structured light. Conventional techniques that take advantage of the inherent texture in the images are not applicable. This is because corresponding stereoscopic road surface views are dissimilar due to the geometry of the cameras and the surface texture. The method described places initial edge points in a low resolution version of the intensity image. These points are used to initialise open active contour models or snakes which are propagated via a pyramid to a higher resolution. At this higher resolution, internal and external constraints are applied to the snake; the internal constraint being a smoothness functional and the external one being based on a maximum likelihood estimate of the edge strength across each light stripe. Computation is spatially localised at each stage and thus this algorithm could easily be parallelised. 1.
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research
Education Level UG and PG ♦ Career/Technical Study
Learning Resource Type Article
Publisher Date 1996-01-01