Gong Chunyuan, Qian Boxing, Lu Qianhai
State Key Laboratory for Manufacturing Systems Engineering, School of Mechanical Engineering, Xi'an Jiao Tong University, Xi'an 710049, China.
School of Mechanical and Precision Instrument Engineering, Xi'an University of Technology, Xi'an 710048, China.
Sensors (Basel). 2025 Jun 25;25(13):3957. doi: 10.3390/s25133957.
In deformation measurements, processing overexposed images poses challenges due to the welding process or metal reflection. To track the deformation surface, an Adaptive Brightness Global Digital Image Correlation method is proposed. First, the effective range is determined based on the extent of image overexposure. Second, an improved Dark Channel Prior method is employed to adjust the brightness of overexposed images. Third, by calculating the parameter results of Finite Element Partitioning, Adaptive Brightness Global Digital Image Correlation can be utilized to conduct deformation measurements. The proposed method can adjust both the image brightness and Finite Element Partitioning for Global Digital Image Correlation. The experimental results demonstrate that the improved dark channel method modifies the image brightness without altering its brightness distribution. The modified image can significantly increase the Mean Intensity Gradient within different partitions. This method overcomes the difficulty in measuring the weld deformation during the welding process and can achieve dynamic deformation measurement using overexposed images. Finally, the evolution processes of unstable deformation and angular deformation in the whole welding field are obtained, which can assist in optimizing the welding process.
在变形测量中，由于焊接过程或金属反射，处理过度曝光的图像具有挑战性。为了跟踪变形表面，提出了一种自适应亮度全局数字图像相关方法。首先，根据图像过度曝光的程度确定有效范围。其次，采用改进的暗通道先验方法来调整过度曝光图像的亮度。第三，通过计算有限元分区的参数结果，自适应亮度全局数字图像相关可用于进行变形测量。所提出的方法可以为全局数字图像相关调整图像亮度和有限元分区。实验结果表明，改进的暗通道方法在不改变其亮度分布的情况下修改了图像亮度。修改后的图像可以显著增加不同分区内的平均强度梯度。该方法克服了焊接过程中测量焊缝变形的困难，并且可以使用过度曝光的图像实现动态变形测量。最后，获得了整个焊接区域中不稳定变形和角变形的演变过程，这有助于优化焊接过程。
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