针对光学拼接焦平面的图像漏缝问题，本文提出了一种基于误差分析的CCD 拼接像元数计算方法。首先，基于相机成像原理建立了焦面光学拼接的模型。结合像方远心和非远心光路系统的特点，对导致漏缝的因素进行分析。对反射镜导致渐晕区的传函下降问题，给出了拼接像元数的计算公式?最后，将该方法应用于焦平面实例，结果表明，CCD 拼接不存在漏缝现象?

In order to eliminate the imaging gap of focal plane based on optical butting, an error analysis-based algorithm of overlapping pixels was proposed. Firstly, an imaging model for focal plane based on optical butting is established according to the imaging principle of camera. Then, the reason causing imaging gaps is analyzed which combined with telecentric and non-telecentric optical system. Combined with the decrease of MTF in the vignetting distortion caused by the reflector, the formula for computing the numbers of overlapping pixels between adjacent CCDs is obtained. Finally, an example is given. Experimental results show that the proposed algorithm can eliminate the imaging gap.