...仿射坐标； 求逆； NAF [gap=1157]Key words：elliptic curves cryptography(ECC); scalar multiplication; affine coordinates; field inversion; nonadjacent form ..
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给出仿射坐标系下场景中平面与像平面的单应关系、绝对二次曲线及其图像的表示。
This paper first presents the homography between a plane in the scene and a plane of the image, and the absolute conic in space under an affine coordinates.
在提取特征的时侯，引入仿射坐标参数，使得新特征能很好的应对目标旋转的情况。
Introducing affine transformation parameters in future extraction, makes the new features can take a good deal of the situation of target rotation.
其基本思想是仿射坐标架中的原点坐标带有两个可以在一定误差范围内变化的调整参数。
The basic idea is. the origin which has two adjustable parameters on the affine coordinate frame and the affine coordinate frame are both active.
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