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渐晕瞳的计算通常采用King的方法。本文提出一种快速算法,用|(H_(p-)H_p~*)/H_p*|i,min<ε作为判别式,以检验光线是否通过某一表面通光孔径的边缘。此方法能方便地求出过渐晕光瞳任意方位边缘点光线的初始座标。对其作光线追迹求得的|(H_(p-)H_p*)/H_p*|i值可达0.1。作一次修正后,渐晕瞳的计算精度可达0.01～0.001。对比计算的结果表明,本文所提方法要比King的算法快2—6倍。
The calculation of vignetting pupil usually adopts King’s method. In this paper, we propose a fast algorithm that uses | (H_ (p-) H_p ~ *) / H_p * | i, min <ε as the discriminant to check whether light passes through the edge of a clear aperture of a surface. This method can easily calculate the initial coordinates of the light of the edge of the arbitrary vignetting pupil. The value of | (H_ (p-) H_p *) / H_p * | i can be up to 0.1. For a correction, the calculation of vignetting pupil up to 0.01 ~ 0.001. The comparison results show that the proposed method is 2-6 times faster than King’s algorithm.