基于B-样条插入图形显示算法的图象仿射变换

Image Affine Transform with B-spline Interpolatory Graphical Display Algorithm

图象进行放大、缩小和旋转是图象处理的一项基本任务 ,一般采用B -样条插值来实现。应用B -样条插入图形显示算法于一般的图象仿射变换。提出的算法不用计算B -样条函数的显式值 ,而是利用B -样条的尺度关系计算采样点的值 ,具有一致且简单的编码。通过对误差限的调节 ,可以得到不同精度的变换图象 。

Affine transform of image is a basic task in image processing.The B-spline interpolatory function is generally adopted in the algorithms of image affine transform. In this paper we applied B-spline interpolatory graphical display algorithm to image affine transform. New algorithm need not directly compute values of B-spline interpolatory function, the values were computed using B-spline scaling relation on sampling points, which had simple and uniform coding.Various degrees of accuracy of image affine transform can be achieved and the time of computing can be controlled by setting different error bound.