This paper proposes a digital image processing-based detection algorithm for cross joint traces of coal roadway heading face.Initially,the acquired images were preprocessed,i.e.,adaptive correction was con-ducted for non-uniform illumination images based on the 2D gamma function.The edge detection algo-rithm was then applied to extract the edges of the structural plane,followed by the filtration of the non-structural plane noises.Moreover,the Hough transform algorithm was applied to extract the linear edges;finally,the edges were locally connected in accordance with the angle and distance criteria.The experimental results show that this algorithm can be used to reduce the noise caused by non-uniform illumination and avoid the mutual interference of multi-scale edges,so as to effectively extract the traces of the cross joint.Furthermore,Q-system and rock mass rating(RMR),were applied to conduct a quan-titative evaluation on the stand-up time of unsupported roof in the four test images.The Q-system qual-ity scores are 26.7,43.3,3.1,and 6.7,and the RMR quality scores are 56.84,58.73,48.42,and 51.42,respectively.The stand-up time of unsupported roofs with a span of 4.6 m are 30,36,7.7 and 14 d,respectively.

Yuxin Yuan;Nong Zhang;Changliang Han;Sen Yang;Zhengzheng Xie;Jin Wang

State Key Laboratory of Coal Resources and Safe Mining,School of Mines,China University of Mining and Technology,Xuzhou 221116,China;School of Civil Engineering,Xuzhou University of Technology,Xuzhou 221000,China;School of Energy Science and Engineering,Xi'an University of Science and Technology,Xi'an 710054,China

矿业科学技术学报（英文版）

[1]Yuxin Yuan;Nong Zhang;Changliang Han;Sen Yang;Zhengzheng Xie;Jin Wang-.Digital image processing-based automatic detection algorithm of cross joint trace and its application in mining roadway excavation practice)[J].矿业科学技术学报（英文版）,2022(06):1219-1231

Digital,processing,automatic,detection,algorithm,cross,joint,its,application,mining,roadway,excavation,practice,This,paper,proposes,digital,traces,coal,heading,face,Initially,acquired,images,were,preprocessed,adaptive,correction,was,ducted,uniform,illumination,2D,gamma,function,then,applied,extract,edges,structural,plane,followed,by,filtration,noises,Moreover,Hough,transform,linear,finally,locally,connected,accordance,angle,distance,criteria,experimental,results,show,that,this,can,be,reduce,caused,avoid,mutual,interference,multi,scale,so,effectively,Furthermore,system,rock,mass,rating,RMR,conduct,quan,titative,evaluation,stand,unsupported,four,test,scores,are,quality,respectively,roofs,span

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