Research On Key Technologies Of Machine Vision Based Embroidery

In this paper, research of embroidery machine based on machine vision has been carried out．Based on the principle of machine vision systems，the platform for edge extraction was selected．To remove the effect caused by picture distortion，and to obtain accurate measurements of object，the camera was calibrated. The edge extraction algorithm was proposed，which was based on region morphology and differential gradient operator．In order to changing data between embroidery machine and outside drawing software，a operator was proposed to translate the graphic data into the sewing data．Research on the craft of sewing and the requirement functions of software，building block design for a HMI of this control system was completed．Firstly，the platform has been built consist of camera，camera lens and light source，according to the requirement of visual analyzing and edge-extracting for small sheets of leather substance．To remove the effect caused by picture distortion，which common exists in machine vision，the camera system has been calibrated by forming a camera model．And through the camera calibrate，the accurate measurements of object was obtained．Secondly，having studied the basic relationship between pixels，a special method of edge-extracting of leather was proposed based on region morphology and differential gradient operator．The result of the extraction was segmented into line, arc and curve with the Ramer algorithm．An edge-extracting operator combines least square fitting method and B-spline curve approximating method was developed，and the analysis results will be stored in a DXF file．Then, In order to obtain the edge information of visual analyzing and enable the data-exchange between embroidery machine and outside drawing software，program in the control system was developed to fetch the DXF file．The operator was proposed to translate the graphic data into the sewing data．Finally，having studied the craft of sewing and the requirement functions of software，building block design for a HMI of this control system was completed．After debugging and processing，The embroidery machine control system achieve the processing requirements. The work efficiency of embroidery machine was enhanced by the proposing of the edge extraction algorithm and the support of DXF file．...