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A newSmethod ofSmeasurement about the width of the workpieceSbased on the computer vision was introduced. Under the support of the open source computer vision library OpenCV, designing and implementing a dynamic real-time measurement system on the width of the workpiece. In order to reduce the effects of other light, a red filter was fixed under the CCD camera,by grabing the photo of the workpiece with the structured light that the red line laser projected,the system takes measures to deal with the image binarization、the interception ofSregion of interest、Contour extraction and so on,and finally realizes the automatic measurement. In the automatic measurement experiment on the different size of workpieces,The experimental results show that the measureing method used in this paper is available in the actual workpiece measuremen, the entire measurement process takes about 100 milliseconds the maximum relative error does not exceed 1.5% .