该文提出了一种计算扫描图象细化后象点点位中误差的方法.通过实验,得出的主要结论是:扫描图象细化后的点位精度由固定误差和比例误差两部分组成;不同细化算法对点位精度影响不大,但扫描仪可能存在系统误差,其大小有待进一步研究.图象细化是扫描图象矢量化的基础,研究扫描图象细化后的精度对某些应用领域(如图象转换为GIS数据库的数据)有着重要的意义.

An algorithm for estimating mean square error of the pixel position of scanned and thinned image is put forward in this paper. Based on some experiments, the conclusion is obtained that mean square error of pixel position is generally composed of both constant error and ratio error, the effect of different thinning approach on the accuracy is too small and the scanner may exist regular error etc. Thinned and scanned image is the basis of tracing vectorization and its accuracy is important in such areas as translating it into datum used by GIS. So it is necessary to study pixel accuracy of scanned and thinned image.