Structural crack change is a common disease in building structures.In view of the shortcomings of the existing two-dimensional crack detection technology under macro photography,this paper designs a target that can adapt to macro photography according to the equivalent physical model of crack change,and develops a two-dimensional crack change detection algorithm.The algorithm consists of target target location,distortion parameter correction,crack parameter calculation and other parts.A micro-range image acquisition device is designed by combining raspberry pie and camera.Based on the indoor test verification,the measurement accuracy of the crack width change under the micro-distance photography is within 0.1 mm.
维普
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