Solar Cell Matrix Crack Detection Based On Image Processing

The application of machine vision technology to the online industrial detection has become one of the research focuses in recent years. Machine vision technology is widely used in the field of industrial detection and control because it can effectively reduce the detection cost, ensure products quality and raise the productivity effect. However, the application of machine vision in high speed on-line detection is still a difficult problem because of the huge quantity of visual information data and the complicated operation. Furthermore human and animal visual mechanism has not figured out completely so far, as a result, the development of the computer vision theory and the machine vision detection technology is restricted to a certain extent. The machine vision detection technology is not mature or perfect at all, which still needs massive research work. As a result of the limitation of the machine vision technology, we need to design different system structures and develop the corresponding algorithms to meet concrete demands in the actual industrial detection, according to various detection systems.In modern automation production process, the people widely use in the machine vision system domains and so on; operating mode surveillance, test of products and quality control. For the past many years along with new aspects and so on material, new craft, new equipment makes the huge progress, many tradition's examination technologies already could not satisfy the modern production the need, displays prominently in: Needs to examine the product type increases rapidly, but many new product not corresponding online examination method; Many quality monitoring situation emphasis real-time, online and non-contact inspection, can guarantee that realizes the positive control to the industrial production process, raises production efficiency and the product qualified rate, but this is the traditional examination method is unable to provide; In addition the modern product's manufacture precision enhances greatly, also requests the corresponding high accuracy examination method. But examines the technology to take one of modern industry foundation technologies, is the quality assurance key, the modern industry progress needs to study the new product examination technology, the machine vision has the broad development opportunities in this domain.The automatic visual examination technology which develops by the machine vision foundation in is an emerging examination technology, face has the explicit project application background in the industry examination's automatic visual examination system, is a high speed development comprehensive discipline, is also synthesizes application technical and so on imagery processing and analysis, pattern recognition, artificial intelligence, precision instrument non-contact examination methods. This method not only needs rationales and so on digital image processing, computer vision, pattern recognition, artificial intelligence, meanwhile involves the machinery, the electricity, the control, the illumination, technologies and so on optics, sensor, man-machine connection. These theories and the technology in the automatic visual examination system are the equal standings; the Interco ordination can constitute a successful industry vision application system.The solar cell array is the satellite energy only origin, its electric power facility for the solar cell piece, the solar cell piece is the brittle product, the solar cell piece breakage immediate influence to the battery output, side the space solar cell related standard, to the solar cell piece's crack, collapses and so on battery piece breakages rate to have the strict request. In develops in the satellite process, the solar cell array after the transportation, mechanics experiment, the hot circulation test and so on, possibly causes the solar cell piece the breakage, therefore, needs to carry on the examination to solar cell, guaranteed that its breakage rate meets the specification. Side therefore, develops one kind precisely, to examine the solar cell array crack, to collapse and a so on damage condition automated examination system is very essential.The traditional solar cell piece crack's recognition is mainly depending on the ocular estimate, by spot investigation personnel survey and record crack's position, length, width and area. then carries on the data the statistics and the classification, and carries on the archive, supplies the judgment. This method's first shortcoming is the labor is big, and examines personnel's vision, the subjective consciousness, the bodily condition, the fatigue and so on, all of above these will be influence to the test result. Second the measuring technique, the reading personal error is big, thus brings the big changeability for the measurement result, causes the measuring accuracy to be bad, moreover this method time-consuming hard sledding, the efficiency is very low.Along with the computer technology and video technology development, real-time capture, storage and inspection of the cracks in solar cells is possible. Domestic and foreign had already studied the path road surface crack and the concretes crack examination. actually rarely has based on solar cell piece crack examination, this word will fill this blank to the solar cell piece crack's examination, the solar cell piece crack examination's research will have a profounder significance. Not only this work will provide a good solution manual examination, the efficiency will be low and the precision will be high, but may also reduce the manpower cost, has the important practical application value and the practical significance.In the article mainly elaborated based on the machine vision and the image processing solar cell array crack examination system's essential algorithm research. First, introduced related knowledge as well as system's background, included project related basic theory knowledge, system's needs analysis, system design, function and structure; Then closely regarding the solar cell piece crack high speed online examination's request, has carried on the detailed elaboration to the related image processing algorithm's research.Considered of photographs of the solar cell piece was important, designs and realizes has been opposite can retain the valid data information in the ordinary threshold value binaryzation algorithm the peak value binaryzation algorithm, has served the purpose which in the primitive image the valid data did not lose as far as possible.In view in the solar cell piece which photographs will have the boundary, has used the unique boundary elimination algorithm, has realized to the empirical datum effective extraction. At the same time, in the solar cell piece has the grid polar line, the influence of the existence of grid polar line to the entire test result is biggest, for this reason, also designed and realizes the effective grid polar line elimination algorithm, the test result had indicated that the algorithm carried out the effect to be quite ideal, has the enough usability and highly effective. In the better elimination picture has affected the crack extraction the information.Will appear in view of the algorithm implementation in causes the crack break the influence, the union actual algorithm to carry out the effect, designed and has realized the crack outline examination and the crack connection algorithm.In the engineering aspect, has completed from the image gathering module, the imagery processing module to the test result data management system a series of procedure design development as well as the test.The simulation run experiment proved that this system plan as well as studies the essential algorithm may real-time examine in the solar cell array the crack outline, has achieved the item design goal initially. In the examination speed, the precision, the stable aspect obtain the good results, this is also the present paper key is.Realizes real-time regarding fills the domestic and foreign imagery processing domain to the solar cell array crack examination to this research direction blank is very meaningful, introduces this research area the machine vision, will give the solar cell array the crack examination work to bring the enormous convenience, raised the examination speed, the examination precision, also reduced the manpower cost, simultaneously will also bring the bigger development opportunities and the opportunity for the machine vision technology.