图像融合的配准精度是关系到图像融合质量的一个重要性能指标。本文所述的红外与可见光图像融合物镜系统采取平行光路布局、光学被动热补偿的方式提高图像融合的配准精度。本文首先分析对比了机械热补偿方式与光学热补偿方式对提高图像配准精度的贡献；其次根据图像融合物镜系统的性能指标对红外物镜和可见光物镜进行光学被动热补偿的优化设计，并分析了对可见光物镜进行光学被动热补偿设计的必要性；第三从光学布局型式及畸变变化来分析图像融合物镜系统的图像配准精度；最后根据图像融合物镜系统的成像质量和图像配准效果，可得出融合图像质量好、能满足指标要求的结论。

The registration accuracy of image fusion is an important performance index that is related to the quality of image fusion. The infrared and visible image fusion objective optical system in this study adopts a parallel optical path layout and an optical passive thermal compensation method to improve the registration accuracy of image fusion. First, the contributions of mechanical thermal compensation and optical thermal compensation are analyzed and compared to improve the image registration accuracy. Second, according to the performance index of the image fusion objective system, the optical passive thermal compensation designs of the infrared objective and visible objective are optimized. Moreover, the necessity of optical passive thermal compensation design of the visible objective is analyzed. Finally, according to the imaging quality and image registration effect of the image fusion objective system, it is concluded that the quality of the fused image is high and that the requirements of the index can be achieved.