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首页> 外文会议>2007 international conference on electronic materials and packaging >Accuracy Improvement of Full-field Displacement Measurement Using Digital Image Correlation for Images Obtained with a Laser Scanning Confocal Microscope
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Accuracy Improvement of Full-field Displacement Measurement Using Digital Image Correlation for Images Obtained with a Laser Scanning Confocal Microscope

机译：使用数字图像相关技术对激光扫描共聚焦显微镜获得的图像进行全视场位移测量的精度提高

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摘要

A method for image correction is proposed for digital image correlation in conjunction with a laser scanning confocal microscope (LSCM). The scan lines of an LSCM have sub-pixel error in their position in the scanning direction (drift distortion). Drift distortion decreases the accuracy of the displacement measured using the DIC method. The correction method proposed here removes both drift distortion and spatial distortion. Drift distortion is removed using a pair of images, each of which has a different scanning direction. Spatial distortion removal is performed using a methodology that employs a series of in-plane rigid body motions and a generated distortion map. Numerical simulations demonstrated that these correction procedures can successfully detect drift distortion. The standard deviation (SD) of the obtained detection error for artificial noise with sub-pixel line-shift was 0.004 pixels. Experimental results involving rigid body motion indicate that, after the correction of drift and spatial distortions, (ⅰ) the standard deviation of the measured displacements was 0.03 pixels, and (ⅱ) the measured displacement fields are unbiased and agree closely with those obtained using an optical microscope. The proposed correction method effectively removes the distortions of obtained images and improves the accuracy of the digital image correlation method using an LSCM.
机译：提出了一种用于图像校正的方法，用于与激光扫描共聚焦显微镜（LSCM）结合使用的数字图像相关性。 LSCM的扫描线在扫描方向上的位置（漂移失真）具有子像素误差。漂移失真降低了使用DIC方法测量的位移的准确性。这里提出的校正方法消除了漂移失真和空间失真。使用一对图像去除漂移失真，每个图像具有不同的扫描方向。使用采用一系列面内刚体运动和产生的失真图的方法进行空间变形去除。数值模拟表明，这些校正程序可以成功地检测漂移失真。所获得的检测误差的标准偏差（SD）用于子像素线路偏移的人工噪声为0.004像素。涉及刚体运动的实验结果表明，在漂移和空间扭曲校正之后，（Ⅰ）测量位移的标准偏差为0.03像素，并且（Ⅱ）测量的位移场与使用的测量的位移场无偏见并与之完全同意光学显微镜。所提出的校正方法有效地去除所获得的图像的扭曲，并使用LSCM提高数字图像相关方法的精度。

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