For the first time, the inversion-free explicit formulae are derived for genus 3 HECC in projectivecoordinatesystem.
首次在射影坐标系下对亏格为3的超椭圆曲线密码体制推导了无需求逆的明确公式。
2
It is shown that the 2_dimensional projectivecoordinatesystem can be constructed by homogeneous vector on the basis of the Descartes homogeneous coordinates.
在笛氏齐次坐标的基础上，采用齐次向量的方法，建立二维射影坐标系。
3
Using projective and perspective transformations, the mathematical model of 3d vision inspection for grid structured light is established in homogeneous coordinatesystem in this paper.