PC Software Development For Paper Surface Defect Detection System

The paper surface defect detection is an important part in the paper productionprocess, which will directly affect the quality of the paper products. However, thereis no effective paper defect detection device in the present paper production line. Inview of this situation, a complete set of high precision paper defect detection systemhave been developed, which can provide a reference for paper production processimprovements and improve the production quality of the paper.The system is divided into two parts, PC and lower computer. Digital signalprocessor TMS320F8212is adopted as the core of the lower computer, by which thecontrol circuit and drive circuit are designed. These circuits contain speed detectioncirtult, camera drive circuit, ligth rack circuit and communication circuit four parts.Image acquisition software uses VC++6.0as the development environment. Themain achievements of this software system are image acquisition, image processing,saving images and network communication functions.PC software system uses Borland C++Builder6.0as the developmentenvironment, and achieves the function of the plurality of functional modules.This system mainly includes the following functions. Its main task is to make keydish to finish software encryption to ensure the developer’s legitimate rights;establish a personnel management system to prevent illegal operations from otherunrelated persons; establish communication mechanisms to achieve communicationcapability between PC and lower computer; map network drives and get collectedpictures from lower computer; use grayscale compensation, binarization, edgeextraction, image capture and other image processing methods to process image, andfinally get the parameters of paper surface defect; determine the type of the papersurface defect accroding to these parameters and rules; build web inspecton threadsto get paper pictures, process images, determine the type of paper surface defect andother functions; complete the data retention and query capabilities; use custommessage to complete the communication between paper defect detection thread andmain thread; control the lower computer to complete different alarm types accordingto the severity of paper surface defect; provided friendly man-machine interface anddisplay the paper production process in real time; design a good testing mechanismto ensure the PC software system reliability, stability and accuracy.Finally, this paper introduces the commissioning and operation of the papersurface defect detection system. And this paper analysises the problems encounteredin the detection process in detail, gives the solutions for these problems. This systemdetects the surface defects of the paper eventually. After a long time locale experiments and debugging, it is demonstrated that thesystem can detect the paper surface defects in real time and have a high precision.This system is confirmed to be able to meet the functional and performancerequirements, and play a guiding role on the production. More importantly, it canreplace the manual visual inspection, and has a high application value in theindustrial production line.