本毕业设计主要是对点图的旋转方式进行渐进式的研究,并将该研究结果应用到具体的图像的旋转中。研究内容涉及到坐标变换原理、图像的边缘检测和计算机几何的一些内容。点图的旋转在图像配准这一领域具有相当重要的意义。
点图的旋转方式包括原点旋转、中心旋转和任意点的旋转。点图的原点旋转使用坐标变换的原理:首先得到旋转矩阵,再将点图上的每一个点的坐标乘以该矩阵就能得到旋转后的点的坐标。点图的中心旋转的过程是先将原图像上所有的点减去中心点的坐标再进行坐标变换,最后将得到所有的点的坐标加上中心点的坐标。点图的任意点的旋转的方法与中心旋转的方法相同,只是将中心点的坐标换任意点的坐标。
在具体图像的旋转中,旋转后图像会有一些形变,其原因说简单点就是像素值取整而产生了一些空白的点。要提高图像旋转的质量就在旋转过程中进行插值计算从而对空白的点进行填充。
关键词:图像配准;坐标变换;旋转矩阵;插值计算
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