Papanikolaou Athanasia, Garbat Piotr, Kujawinska Malgorzata
Faculty of Mechatronics, Warsaw University of Technology, 08-525 Warsaw, Poland.
Faculty of Electronics and Information Technology, Warsaw University of Technology, 00-665 Warsaw, Poland.
Sensors (Basel). 2022 Sep 28;22(19):7359. doi: 10.3390/s22197359.
A modified 3D colour digital image correlation method (3D cDIC) is proposed for efficient displacement measurements of colour objects with natural texture. The method is using a separate analysis of correlation coefficient (sigma) value in the RGB channels of CCD cameras by utilising local information from the channel with the minimum sigma. In this way, merged U, V and W displacement maps are generated based on the local correlation quality. As the proposed method applies to colour filter array cameras, the images in RGB channels have to undergo a demosaicking procedure which directly influences the accuracy of displacement measurements. In the paper, the best performing demosaicking methods are selected. The metrological analysis of their influence on the results of canvas paintings investigations obtained by unmodified and modified 3D cDIC processing is presented.
提出了一种改进的三维彩色数字图像相关方法（3D cDIC），用于对具有自然纹理的彩色物体进行高效位移测量。该方法通过利用具有最小相关系数（sigma）的通道中的局部信息，对CCD相机的RGB通道中的相关系数（sigma）值进行单独分析。通过这种方式，基于局部相关质量生成合并的U、V和W位移图。由于所提出的方法适用于彩色滤光片阵列相机，RGB通道中的图像必须经过去马赛克处理，这直接影响位移测量的准确性。本文选择了性能最佳的去马赛克方法。给出了它们对未经修改和修改后的3D cDIC处理所获得的帆布画调查结果影响的计量分析。
