High speed three dimensional imaging method

Details High speed three dimensional imaging method High speed three dimensional imaging method

1996-09-30

2000-02-22

Evans, F. L.

Optics: measuring and testing

By polarized light examination

With light attenuation

250237G, G01B 1124

Patent

active

060286725

ABSTRACT:
The target of the present invention is to provide a high speed, low-cost, multi-mode three-dimensional (3D) surface profile measurement method. The proposed Rainbow Stereo 3D Camera exploits the projected color light with a spatially distributed wavelength spectrum on the surface of objects in the scene. Multiple color imaging sensors separated by a baseline distance are used to capture stereo pair images of the scene at camera's frame rate. The 3D depth values are calculated using triangulation principle by finding pixels corresponding to a common color feature in both images. Unlike conventional stereo correspondence matching algorithms, which requires the feature extraction from a group of pixels, the proposed method utilizes a projected rainbow color pattern as unique landmarks of each pixel for correspondence registration. Essentially, the colors of pixels in a pair of stereo images are used as a "token" to perform the stereo match. Searching corresponding point in a pair of stereo images becomes a straightforward pixel-to-pixel color matching. A simple and efficient 3D triangulation algorithm can be formulated to generate full frames of 3D images in high speed.

REFERENCES:
patent: 5018854 (1991-05-01), Rioux
patent: 5135309 (1992-08-01), Kuchel et al.
patent: 5237404 (1993-08-01), Tanaka et al.
patent: 5381235 (1995-01-01), Inoue et al.

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