Control System Design Of Leather Spraying Machine Based On Machine Vision

Based on machine vision technology, leather spraying machine wasreformed in our work. And a kind of intelligent control system whichincludes image acquisition, image processing and automatic controlspraying gun, was designed.The leather spraying control system based on machinery visionmainly includes computer, camera, image acquisition card, light source,DI/DO card of digital signal and leather transmission institutions. Theproposed execution process was developed as follows: we installed acamera before transmission system collected the image information ofleather. The image collected through image gathering card wastransmitted to a computer and then be analyzed. After the analysis, thetreatment was produced automatically by computer and transmitted toDI/DO card. The condition of the spraying gun was controlled byDI/DO card.The interface was designed and the function was realized by usingMicrosoft VC++6.0in leather spraying measurement system. Thesoft-wares of leather spraying system based on Machine vision wereimage acquisition module, image processing module, regional rapididentification module, spraying data generating module and sprayingcontrol module. To meet with system image processing requirements forreal-time, a multi-threading was used at the basis of system programwhen designing soft-wares. Multi-threading included GrabThread imagecollection line, image processing and display thread and PCI2320threadinterrupt.The common image processing algorithms was compared in thesimulation experiment. And the design method was finally determinedbased on the reality of this subject. The final design method was that: The collected image was firstly denoised using Gauss de-noising, andthen divided using empirical threshold for image segmentation. At last,the image was dealt with gray closing operation method for postprocessing part.Detection precision machine vision system was used to realize theaccurate detection of leather shape in our work. And, each gun wascontrolled fast and conveniently by using DI/DO card according to theshape detection results, to achieve the synchronous operation of imageacquisition and paint spraying real-time.