单幅图像估计离焦量的航空摄像机自动调焦系统

发布时间：2018-06-27 23:37

本文选题：航空相机 + 自动调焦　；参考：《液晶与显示》2016年05期

【摘要】：为了改进航空相机自动调焦的方法,解决传统对焦深度法自身不可避免的多峰值问题和实时性问题。本文提出一种新型自动调焦方法,建立了调焦模型,并通过实验装置验证了该方法,调焦时间相比传统方法短,实现了一次定位的调焦方法。首先,通过采集大量不同离焦程度的自然图像作为分析样本的总体,对总体中分类采样出小块样本进行运算分析,经过迭代运算获得所需模板;然后,在凸轮机构完成粗调焦以后采集当前图像,通过对当前图像采样,把采集的样本小块放入建立好的模板中计算,得到当前镜头的离焦量。最后,根据离焦量的结果,换算为调焦执行机构的位移量,驱动调焦电机移动相应位移完成调焦。实验结果表明:在目前实验条件下离焦量计算时间为0.4s,较传统方法的4~8s调焦时间有了大幅度提高。在保证调焦精度的前提下,实现了一种具有实时性的自动调焦方法。
[Abstract]:In order to improve the automatic focusing method of aerial camera, the traditional focusing depth method can solve the inevitable multi-peak value problem and real-time problem. In this paper, a new automatic focusing method is proposed, and the focusing model is established. The method is verified by the experimental device. The focusing time is shorter than that of the traditional method, and the primary positioning focusing method is realized. First of all, by collecting a large number of natural images with different degrees of defocus as the whole of the analysis samples, the small samples are sampled and analyzed, and the required templates are obtained by iterative operation. The current image is collected after the cam mechanism has finished coarse focusing. By sampling the current image, the sample block is put into the established template to calculate the defocus of the current lens. Finally, according to the results of the defocus, the displacement of the focusing actuator is converted, and the corresponding displacement of the focusing motor is driven to complete the focusing. The experimental results show that the calculation time of defocus is 0.4s under the present experimental conditions, which is much higher than that of the traditional method (4s / 8s). In order to ensure the accuracy of focusing, a real-time automatic focusing method is realized.
【作者单位】：中国科学院长春光学精密机械与物理研究所;中国科学院大学;陆军航空兵学院;
【基金】：国家重点基础研究发展计划项目(973计划)(No.2009CB72400603B)~~
【分类号】：V245.6;TP391.41

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