论文部分内容阅读
目前采用高分辨率全帧面阵CCD FTF5066M作图像传感器的航拍相机帧频一般不超过1 fps,为了满足高帧频应用,文中首先介绍了全帧型面阵CCDFTF5066M的基本驱动电路,并对其进行了改进,利用CCD 4个输出放大器进行同时输出,使最高帧频达到了3.4 fps,介绍了4路输出时CCD驱动时序、前端处理电路、直流偏置电路、接口电路等的设计,改进后的驱动电路能满足多种航拍相机的应用要求。然后对全帧型面阵CCDFTF5066M的非均匀性进行了分析,并建立了一种响应非均匀性检测系统。利用该系统分别对面阵CCD5066M的4个象限之间的非均匀性和每个像元之间的非均匀性进行了检测。在CCD响应度为线性的基础上,提出了两点校正算法并对非均匀性进行校正。通过校正4个象限响应灵敏度的标准偏差降低到原来的1/13。通过对鉴别率板的重新拍摄,可以看出面阵CCD的非均匀性得到了明显的改善。
At present, the frame rate of the aerial camera using the high resolution full-frame CCD CCD FTF5066M as the image sensor generally does not exceed 1 fps. In order to meet the application of high frame rate, the basic driving circuit of the full-frame CCD FTF5066M is introduced firstly, The four output amplifiers are used to output at the same time. The maximum frame rate is 3.4 fps. The design of CCD drive timing, front-end processing circuit, DC bias circuit, interface circuit and so on are introduced. After the improvement, The driver circuit can meet a variety of aerial camera application requirements. Then, the non-uniformity of the full-frame CCD FTF5066M is analyzed, and a response non-uniformity detection system is established. The system was used to detect the non-uniformity of the four quadrants of the CCD 5066M and the nonuniformity of each pixel. Based on the linear CCD response, a two-point correction algorithm is proposed and the non-uniformity is corrected. The standard deviation of the response sensitivity of the four quadrants is reduced to 1/13 of the original by correcting. By re-photographing the discriminating board, it can be seen that the nonuniformity of the area CCD has been significantly improved.