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Imaging apparatus and method for detecting object surface micro deformation through machine vision

A technology of machine vision detection and object surface, applied in the direction of measuring devices, optical devices, instruments, etc., can solve problems such as inability to image, and achieve the effect of simple and easy technical means

Inactive Publication Date: 2016-06-01
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Effectively solve the problem that the micro-deformation defect on the surface of the detected object is too small and cannot be imaged due to the same color as the target, so that the defect information of the micro-deformation on the surface of the object can be characterized and identified

Method used

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  • Imaging apparatus and method for detecting object surface micro deformation through machine vision
  • Imaging apparatus and method for detecting object surface micro deformation through machine vision
  • Imaging apparatus and method for detecting object surface micro deformation through machine vision

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Embodiment

[0024] Such as figure 1 , 2 shown. The invention discloses an imaging device for machine vision detection of micro-deformation on the surface of an object, comprising a display 1, a camera 2 and a computer 3; the display 1 is used to modulate the grating stripe light 5 (such as black and white vertical stripes) that produces a sinusoidal phase shift The camera 2 and the display 1 are arranged above the surface of the detected object 4; the grating stripe light 5 of the display 1 is irradiated to the entire upper surface of the detected object 4, and a fringe image is formed on the entire upper surface of the detected object 4, The camera 2 is used to collect the fringe image reflected on the surface of the detected object 4 and transmit it to the image analysis system of the computer 3 . The display 1 is a liquid crystal display display. The camera 2 is an industrial camera.

[0025] The camera 2 and the display 1 are installed above the detected object 4 in a V shape.

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Abstract

The invention discloses an imaging apparatus and method for detecting object surface micro deformation through machine vision. The apparatus comprises a display, a camera and a computer. The display is used for modulating grating stripe light generating a sine phase shift; the camera and the display are arranged above the surface of a detected object to enable the grating stripe light of the display to be irradiated on the whole upper surface of the detected object and form a stripe image on the whole upper surface of the detected object, and the camera is used for acquiring the stripe image reflected by the surface of the detected object. When the surface of the detected object has such micro defects as projections or recesses and the like, light reflectivity is changed and deflected as a result, grating stripes are locally distorted and deformed, and the distortion deformation portion is just the micro deformation of the surface of the detected object. The imaging apparatus and method provided by the invention solve the problem of incapability of imaging due to too small micro deformation defect on the surface of an object and the same color with a target and enable defect information of the object surface micro deformation to be represented and identified.

Description

technical field [0001] The invention relates to the field of machine vision optical imaging and image processing, in particular to an imaging device and method for machine vision to detect micro-deformation on the surface of an object. Background technique [0002] After decades of development, machine vision has brought a new solution to industrial automation and is widely used in product quality inspection in industrial manufacturing processes. The combination of machine vision technology and industrial automation has resulted in visual inspection technology. The key to visual inspection is to design the correct optical imaging scheme and image processing method. Therefore, targeted light source illumination and imaging methods and image processing methods become extremely important. [0003] Due to the uncertain factors of quality control during the production of industrial products, various defects often occur on the product surface, most of which have effective avoida...

Claims

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Application Information

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IPC IPC(8): G01B11/16
CPCG01B11/167
Inventor 文生平刘云明
Owner SOUTH CHINA UNIV OF TECH
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