Quick three-dimensional human head measurement method based on digital speckle correlation

A digital speckle correlation and measurement method technology, applied in the field of optical measurement, can solve problems affecting the measurement accuracy and efficiency of digital images

Active Publication Date: 2020-11-27
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

However, in digital image correlation technology, digital speckle correlation algorithm will directly affect the measurement accuracy and measurement efficiency of digital image correlation
At present, there is still a lack of a 3D measurement method that can achieve high efficiency and high precision with only a single measurement

Method used

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  • Quick three-dimensional human head measurement method based on digital speckle correlation
  • Quick three-dimensional human head measurement method based on digital speckle correlation
  • Quick three-dimensional human head measurement method based on digital speckle correlation

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Experimental program
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Embodiment

[0049] In order to verify the effectiveness of the present invention, two cameras (model acA2440-75um, Basler) and a computer were used to construct a set of three-dimensional measurement device based on digital speckle correlation fast three-dimensional head measurement method. The shooting speed of this set of devices is 25 frames per second when performing three-dimensional measurement of objects.

[0050] Using the description in step 1, first put the speckled headgear on the head model, and place the two cameras relatively vertically to obtain a two-dimensional image of the human head model with speckles.

[0051] Using the method described in step 2, manually mark the speckle area to be measured in the image through human-computer interaction, set the center point of the speckle area as the seed point, and obtain the initial estimated displacement of the seed point through SIFT and RANSAC;

[0052] As described in step 3, the head parallax data between two camera views c...

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Abstract

The invention discloses a quick three-dimensional human head measurement method based on digital speckle correlation. The method comprises the steps: enabling a human head model to be sleeved with a silk head sleeve with speckles, and enabling two cameras to be placed oppositely and vertically, so as to obtain a human head model two-dimensional image with speckles; marking a speckle area to be measured in the image, setting the central point of the speckle area as a seed point, and obtaining the initial estimated displacement of the seed point through SIFT and RANSAC; head parallax data between two camera visual angles can be obtained by using a digital image correlation algorithm (DIC), and the parallax data is converted into three-dimensional information by using calibration parameters of the cameras. According to the invention, single-frame and high-precision three-dimensional human head measurement can be realized.

Description

technical field [0001] The invention belongs to the technical field of optical measurement, in particular to a fast three-dimensional head measurement method based on digital speckle correlation. Background technique [0002] In recent decades, 3D contour measurement technology has been widely used in various fields, such as online industrial inspection, reverse modeling and 3D face measurement. Among the many three-dimensional profile measurement methods, the digital image correlation technology based on speckle correlation and triangulation principles is one of the most efficient and practical technologies, because it has the advantages of non-contact, full-field, high precision and high efficiency. However, in the digital image correlation technology, the digital speckle correlation algorithm will directly affect the measurement accuracy and measurement efficiency of the digital image correlation. At present, there is still a lack of a three-dimensional measurement metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/80G06T17/00G06T3/00G06K9/46
CPCG06T7/85G06T3/0006G06T17/00G06V10/462
Inventor 左超尹维陈钱冯世杰孙佳嵩胡岩尚昱昊陶天阳
Owner NANJING UNIV OF SCI & TECH
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