联合光度立体视觉和图像校正的磨粒三维形貌重建  

Three-dimensional Reconstruction of Wear Particle Surfaces Based on Photometric Stereo Vision and Image Correction

作　　者：周俊丽 孙乐雨 ZHOU Junli;SUN Leyu(China Energy Group Shendong Coal Group Quality and Technology Testing Center,Ordos Inner Mongolia 017209,China;China Energy Group Shendong Ordos New Energy Technology Development Co.,Ltd.,Ordos Inner Mongolia 017209,China)

机构地区：[1]国家能源集团神东煤炭集团质量技术检测检验中心,内蒙古鄂尔多斯017209 [2]国能神东鄂尔多斯市新能源科技开发有限责任公司,内蒙古鄂尔多斯017209

出　　处：《润滑与密封》2024年第5期177-182,共6页Lubrication Engineering

基　　金：中国神华能源股份有限公司神东煤炭分公司项目(201391548017,201491548044)。

摘　　要：分析铁谱技术在机械装备磨损状态检测中发挥了重要作用,但其仅能提供磨粒二维图像,导致磨粒形貌信息不足。为实现磨粒三维形貌的精确重建,联合光度立体视觉和图像校正,为精确重建磨粒的三维形貌,联合光度立体视觉和图像。该方法首先采用大津阈值法由全光源图像识别磨粒与背景区域;然后为消除LED发光强度差异对磨粒形貌重建的影响,结合平面形状和朗伯反射模型确定背景区域的理想成像亮度,并校正各光度图像序列的亮度;最后根据光度立体视觉方法,由校正后光度图像序列重建磨粒的三维形貌。以不同类型的磨粒为测试样本,将所提出的方法的重建结果与激光共聚焦显微镜的测量结果进行对比。结果表明:重建磨粒的形貌参数误差小于15%,表明提出的方法能够精确重建磨粒的三维形貌。Ferrograph analysis technology has been adopted for determining the wear status of mechanical equipment,but it can only provide two-dimensional image of wear particles,resulting in incomplete characterization of wear particles.To accurately reconstruct the three-dimensional(3D)morphology of wear particles,a 3D reconstruction method by introdu-cing photometric stereo vision into the ferrography analysis process was proposed.The wear particle regions are firstly seg-mented from the image background using the the maximal variance between clusters method based on the illumination spa-tial variation of the full-light images.Then,in order to eliminate the reconstruction error of wear particle morphology caused by the illumination intensity differences of different LEDs,the ideal imaging brightness of background regions is defined by the plane shape and Lambertian reflection model,and then the brightness distribution of each photometric image sequence is corrected.Finally,3D wear particle surfaces are reconstructed based on the principle of photometric stereo vision from the corrected photometric image sequences.With different types of wear particles,the proposed method is compared with the confocal laser scanning microscope.The reconstruction results of the proposed method were compared with the measurement results of confocal laser scanning microscope using different types of wear particles as test samples.The result shows that the parameter error of the reconstructed wear particle morphology is less than 15%,indicating that the proposed method can accurately reconstruct the3D morphology of the wear particles.

关 键 词：磨粒分析 铁谱技术 光度立体视觉 图像校正 

分 类 号：TH117[机械工程—机械设计及理论]