本文選題：航空相機 + 自動調(diào)焦��； 參考：《液晶與顯示》2016年05期

【摘要】：為了改進航空相機自動調(diào)焦的方法,解決傳統(tǒng)對焦深度法自身不可避免的多峰值問題和實時性問題。本文提出一種新型自動調(diào)焦方法,建立了調(diào)焦模型,并通過實驗裝置驗證了該方法,調(diào)焦時間相比傳統(tǒng)方法短,實現(xiàn)了一次定位的調(diào)焦方法。首先,通過采集大量不同離焦程度的自然圖像作為分析樣本的總體,對總體中分類采樣出小塊樣本進行運算分析,經(jīng)過迭代運算獲得所需模板;然后,在凸輪機構(gòu)完成粗調(diào)焦以后采集當前圖像,通過對當前圖像采樣,把采集的樣本小塊放入建立好的模板中計算,得到當前鏡頭的離焦量。最后,根據(jù)離焦量的結(jié)果,換算為調(diào)焦執(zhí)行機構(gòu)的位移量,驅(qū)動調(diào)焦電機移動相應(yīng)位移完成調(diào)焦。實驗結(jié)果表明:在目前實驗條件下離焦量計算時間為0.4s,較傳統(tǒng)方法的4~8s調(diào)焦時間有了大幅度提高。在保證調(diào)焦精度的前提下,實現(xiàn)了一種具有實時性的自動調(diào)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.
【作者單位】： 中國科學院長春光學精密機械與物理研究所;中國科學院大學;陸軍航空兵學院;
【基金】：國家重點基礎(chǔ)研究發(fā)展計劃項目(973計劃)(No.2009CB72400603B)~~
【分類號】：V245.6;TP391.41

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