High-resolution large area CCD camera frame rate design and its non-uniformity correction
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摘要: 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。
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关键词:
- 全帧型面阵CCDFTF5066M /
- 高频帧 /
- 驱动时序 /
- 非均匀性校正 /
- 两点校正法
Abstract: Using high-resolution full frame area array CCD FTF5066M as aerial image sensor of the camera, its frame rate is generally not more than 1 fps, which can not meet the high frame rate applications. Firstly, the full frame area array CCDFTF5066M drive circuit was introduced in this paper, and it was also been improved. Using CCD four output amplifiers to output at the same time, the highest frame rate reached 3.4 fps. Secondly, the timing of the CCD driver, front-end processing circuit, DC bias circuit, interface circuit of the four outputs were designed. The improved driver circuit could meet the application requirements of various aerial camera. Then the full frame area array CCDFTF5066M non-uniformity was analyzed, and a non-uniform response detection system was established. Using this system, the array CCD5066M's non-uniformity between the four quadrants and each pixel was tested separately. On the basis of CCD linear responsivity, two correction algorithm was proposed to correct the non-uniformity. At last, by correcting, the four quadrants's standard deviation of response sensitivity was reduced to the original's 1/13. Through the re-shoting of the identify rate board, it can seen that the array CCD's non-uniformity has been improved obviously. -
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