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为了将基于图像处理的智能调焦方法引入到空间遥感相机中,从而提高其在轨调焦能力,提出了采用辅助CCD的遥感相机智能调焦方法。该方法解决了推扫式遥感相机由于图像动态变化导致的比较基准不确定问题,为智能调焦方法在遥感相机中的应用开创了途径。在阐述基本调焦原理的基础上,给出了实际应用中多片CCD级联时评价区域选择依据和算法,并以Variance函数为评价函数对调焦过程进行了仿真模拟,实验结果表明:该方法能够可靠、自动地搜索到最佳聚焦位置,获取清晰图像,适用于遥感相机使用。
In order to introduce the intelligent focusing method based on image processing into the space remote sensing camera to improve its in-orbit focusing ability, a smart focusing method of the remote sensing camera using the auxiliary CCD is proposed. The method solves the problem of the uncertainty of the reference of the push-push remote sensing camera due to the dynamic change of the image, and opens up a way for the application of the smart focusing method in the remote sensing camera. Based on the principle of basic focusing, the selection criteria and algorithm of evaluation region in multi-chip CCD cascade are given in practical application. The focusing process is simulated by using Variance function as evaluation function. The experimental results show that: The method reliably and automatically searches for the best focus for clear images for remote sensing cameras.