Abstract

With the non-periodicity and discrete nature, and unnecessary of phase unwrapping process, digital speckle correlation method shows its significant advantages in three-dimensional (3D) shape measurement. Combining with the spatial correlation and temporal correlation method in the digital speckle correlation, a spatio-temporal digital speckle correlation was developed in this paper, which can improve the accuracy of 3D shape measurement and effectively reduce the number of the recorded speckle images for restoring the corresponding 3D shape at the same time. In the experiment, only 5 frames of the required speckle images was needed to reconstruct the 3D shape of a complex object with spatio-temporal digital speckle correlation method, and its accuracy was same as the result when 20 frames speckle images were used in temporal correlation method.

Highlights

  • Digital Speckle Correlation Method (DSCM) is an optical three-dimensional (3D) measurement method

  • Digital speckle spatio-temporal correlation, only 5 frame speckle patterns need to reconstruct the 3D shape of the petal model, and the parallax information on the edge of the flower is significantly more detailed compared with the result of the digital speckle spatial correlation operation

  • On the basis of two existing methods, spatial correlation and temporal correlation method of digital speckle correlation measurement, a new method is proposed in this paper

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Summary

Introduction

Digital Speckle Correlation Method (DSCM) is an optical three-dimensional (3D) measurement method. In 2015, Junpeng Xue adopted the digital speckle correlation method based on color speckle pattern projection to realize the high speed 3D measurement of the human face [11]. Most of these scholars’ research on DSCM can be divided into spatial correlation or temporal correlation. The digital speckle spatial correlation method based on stereo vision has low accuracy, but this method only needs one pair of images synchronously shot by the left and right camera to complete the measurement process, which is suitable for the measurement of dynamic objects.

Principle of Three Methods of Digital Speckle Correlation
Principle of Digital Speckle Spatial Correlation
Principle of Digital Speckle Temporal Correlation
Principle of Digital Speckle Spatio-Temporal Correlation
Experimental Results
Conclusions
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