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首页> 外文期刊>Measurement Science & Technology >Calibrating mirror-assisted multi-view digital image correlation system using a speckled planar object
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Calibrating mirror-assisted multi-view digital image correlation system using a speckled planar object

机译：使用斑点平面对象校准镜面辅助的多视图数字图像相关系统

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摘要

Recently, a novel low-cost and easy-to-implement mirror-assisted multi-view digital image correlation (MV-DIC) technique that uses only a vertically arranged binocular stereo-digital image correlation (stereo-DIC) system and two planar mirrors was proposed for panoramic/dual-surface kinematic field measurements. The mirror-assisted MV-DIC, which is equivalent to a regular MV-DIC system comprising three/two identical stereo-DIC systems, can simultaneously measure three/two different regions of a test sample. To perform panoramic/dual-surface kinematic field measurements with this technique, one of the most important procedures is accurately calibrating the reflection transformation of each mirror to transform all measured regions to a common world coordinate system. Previous works calibrate the reflection transformation by decorating speckle patterns on the mirrors or adjusting the mirrors to various poses, which either occupies precious spatial resolution of the sensor or is complicated in implementation. In this work, an easy-to-implement and practical method that employs only a speckled planar object is proposed to calibrate the reflection transformation of the planar mirrors. The effectiveness and accuracy of the proposed method are well evaluated and validated. Compared with existing methods, the proposed method holds the advantage of being efficient in sensor utilization and simple in implementation and is therefore highly recommended for the practical use of the mirror-assisted MV-DIC technique.
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