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Systems and methods for performing machine vision using diffuse structured light

A machine vision, diffuser technology, applied in the direction of using optical devices, instruments, measuring devices, etc., can solve the problem of not receiving collimated light and so on

Inactive Publication Date: 2014-06-11
THE TRUSTEES OF COLUMBIA UNIV IN THE CITY OF NEW YORK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The same problem occurs on the right side 114 of the cube 104, this side is completely visible to the image sensor, but the image sensor does not receive any collimated light

Method used

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  • Systems and methods for performing machine vision using diffuse structured light
  • Systems and methods for performing machine vision using diffuse structured light
  • Systems and methods for performing machine vision using diffuse structured light

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Embodiment Construction

[0034] Systems and methods for machine vision using diffuse structured light are provided.

[0035] According to some embodiments, specular reflections and shadowing in machine vision systems may be reduced by using a two-dimensional light pattern that diffuses in one of two dimensions. One way to achieve this lighting pattern is to place an optical diffuser 202 in the projected lighting path, such as Figure 2a shown. In some embodiments, the diffuser can be rectilinear such that, essentially, the diffuser scatters incident light along only one of its two spatial dimensions (eg, dimension X206 and dimension Y208 ), such as dimension X206 . Such as Figure 2a As shown, a single ray 204 incident on the top of the diffuser 202 is transformed into a one-dimensional fan-shaped ray 210 that exits the bottom of the diffuser 202 . The shape of the sector 210 is determined by the scattering function D(θ) of the diffuser 202 and can be selected according to the needs of use. In som...

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Abstract

Systems for performing machine vision using diffuse structured light comprise: a linear diffuser having an axis of diffusion; a light source that projects an illumination pattern through the linear diffuser and onto a scene, wherein the illumination pattern has translational symmetry in a direction of translation that is aligned with the axis of diffusion; and an image sensor that detects tight reflecting from the scene and that outputs signals corresponding to the detected light. Methods for performing machine vision using diffuse structured light comprise: projecting an illumination pattern from a light source through a linear diffuser and onto a scene, wherein the linear diffuser has an axis of diffusion and the illumination pattern has translational symmetry in a direction of translation that is aligned with the axis of diffusion; and detecting light reflecting from, the scene using an image sensor that outputs signals corresponding to the detected light.

Description

[0001] Cross References to Related Applications [0002] This patent application is an international application filed on August 15, 2012 and published on February 21, 2013 (the international application number is PCT / US2012 / 051004, and the international publication number is WO2013 / 025842A1) in the national phase of China. The International Application claims the benefit of the following United States Provisional Patent Application: Provisional Application No. 61 / 523,755, filed August 15, 2011, which is hereby incorporated in its entirety. Background technique [0003] Vision systems based on structured light have a wide range of uses, such as factory automation and visual inspection for robotic assembly. Illumination techniques in such structured light-based vision systems have been developed to detect surface defects, separate reflective components, evaluate material properties, and recover 3D structures, among others. Such structured light-based vision systems are often p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/30
CPCG01B11/25
Inventor 叙理·K·纳亚尔
Owner THE TRUSTEES OF COLUMBIA UNIV IN THE CITY OF NEW YORK