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在大多数情况中,误差运动值等于正好包容相应的误差运动极图象的两个同心圆的半径差,而所得数值的大小则取决于两圆公共圆心的位置。此标准中确定极图象中心位置有四种方法:
In most cases, the error motion value is equal to the difference in radius of two concentric circles that exactly accommodate the corresponding error motion pole image, and the magnitude of the resulting value depends on the position of the common center of two circles. There are four ways to determine the center of polar image in this standard: