A New Method For Digitizing Paper-Based Testing Curves

In this paper, a new method to digitalize testing curves recorded on paper, is proposed to resolve the existing problems with processing the manual paper-based curves. A scanner is used to gain the image of paper-based testing curves. A special computer program-an image-processed program is developed, which used to recognizeand segment the curves and the lines of calibration in its background. A algorithm of Ostu method with maximum variance between two classes based on three primary-color is introduced to gel the threshold of curves image segmentation. And a fast thinning algorithm based on double edge detection and the character of the curves is also introduced, which could extract the curves reliably and effectively as the same time as image thinning. This method is proved efficient by practical application.