An Image Digitization Method Based on Curve Fitting and Computer Aid Technique

It is difficult to apply automatic vectorization to digitization of engineering curve image because of the shortages of existing theoretic and method.It is also of lower efficiency even if semiautomatic vectorization method is used.A digitization method based on spline curve fitting and computer aided technique is established.It is very easy to apply it,that is,a curve image is loaded to computer by scan and the fitting curve nodes are chosen directly by mouse.The fitting curve nodes can be chosen exactly by means of observing if the fitting spline curve between a mouse moving point and its front twice chosen nodes is approximately consistent with the original curve.Not only is it quick,exact,operation conveniences but mathematics expressions of the curves are given.It can be widely used to engineering.