Digital speckle correlation rapid implementation method for extracting seed points based on grids

A technology of digital speckle correlation and realization method, applied in the field of optical measurement, can solve the problem of not being able to obtain high enough computational efficiency, and achieve the effect of high-precision, high-speed single-frame three-dimensional object measurement and high computational efficiency

Active Publication Date: 2021-07-09
NANJING UNIV OF SCI & TECH
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Problems solved by technology

At present, DIC mainly uses the IC-GN algorithm, but this

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  • Digital speckle correlation rapid implementation method for extracting seed points based on grids
  • Digital speckle correlation rapid implementation method for extracting seed points based on grids
  • Digital speckle correlation rapid implementation method for extracting seed points based on grids

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[0023] Such as figure 1 As shown, a fast digital speckle correlation method based on grid extraction of seed points is first used to project a speckle image with an infrared laser projector, and then a binocular camera is placed and photographed relatively vertically to obtain a two-dimensional speckle image of the object. Use the mouse callback function of the OpenCV library to manually select the speckle area that needs to be matched, use the grid to divide the area to be tested into several blocks, and take seed points for each block, and use multi-threaded operations to find the reference image in the target image For the points corresponding to each point in , calculate the disparity value of the target image relative to the reference image. Using the internal and external parameters calibrated by the camera, the parallax value is converted into three-dimensional data for 3D reconstruction. The specific steps are:

[0024] Step 1: Use an infrared laser projector to proj...

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Abstract

The invention discloses a digital speckle correlation rapid implementation method for extracting seed points based on grids, which comprises the following steps of projecting a speckle image to an object to be measured by using an infrared laser projector, and shooting the image by using a binocular camera, calibrating the cameras, acquiring internal and external parameters of the cameras, enabling the two cameras to shoot two-dimensional speckle images of an object respectively, enabling one image to serve as a reference image, and the other image to serve as a target image, using a mouse callback function of the OpenCV library to frame out a speckle region to be measured in the reference image, dividing the speckle area to be measured into eight blocks with the same size by using grids, and setting the central point of each block as a seed point, solving the parallax value of each point in the speckle areas to be measured of the reference image and the target image by using a digital image correlation algorithm, and converting the parallax value into three-dimensional data by using internal and external parameters calibrated by a camera, and performing 3D reconstruction. According to the method, the calculation efficiency is remarkably improved while the high measurement precision is ensured.

Description

technical field [0001] The invention belongs to the technical field of optical measurement, in particular to a method for fast realization of digital speckle correlation based on grid-based extraction of seed points. Background technique [0002] Digital Image Correlation (DIC) is an easy-to-implement, non-contact, general-purpose optical technology that has many applications in fields such as full-field motion, deformation, and shape measurement. At present, DIC mainly adopts the IC-GN algorithm, but this method cannot obtain high enough computational efficiency. Contents of the invention [0003] The invention proposes a method for quickly implementing digital speckle correlation based on grid extraction seed points. [0004] The technical solution for realizing the present invention is: a method for quickly implementing digital speckle correlation based on grid extraction seed points, and the specific steps are: [0005] Step 1: Use an infrared laser projector to proj...

Claims

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Application Information

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IPC IPC(8): G01B11/00G01B11/24G01B11/16G06K9/62G06T7/80
CPCG01B11/002G01B11/24G01B11/16G06T7/85G06T2207/10028G06F18/22Y02T90/00
Inventor 陈俊彤左超陈钱尹维冯世杰孙佳嵩胡岩
Owner NANJING UNIV OF SCI & TECH
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