基于贝塞尔曲线法线的太阳圆心求取方法

Method to Calculate the Center of the Sun Based on the Normal Lines of the Bézier Curve

针对测日定向中获取的残缺不完整太阳图像难以确定其圆心的问题,本文提出了一种新的基于贝塞尔曲线法线的太阳圆心求取方法。该方法通过将图像上太阳的轮廓信息还原成贝塞尔曲线,利用轮廓点筛选由贝塞尔曲线的多个法线交点计算得来的圆心和半径,来确定太阳圆心的精确位置。实验结果表明该方法在太阳完整或残缺的情况下,均能精确可靠地求取太阳圆心。

To solve the problem that it is difficult to determine the center of the fragmentary sun image obtained in the heliographic orientation,a new method for calculating the center of the solar circle based on the normal of Bézier curve is proposed.In this method,the precise position of the sun′s center is determined by using contour points to filter the center and radius calculated from the intersection of multiple normal line of Bézier curve,which is restored from the solar contour information in the image.The experimental results show that this method can accurately and reliably calculate the center of the sun under the condition of complete or incomplete sun.