Correction of pixel response non-uniformity in TDICCD mosaic camera
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摘要:为了解决光学TDICCD成像系统在拼接模式下的像元响应非均匀性问题,研究了TDICCD像元校正的原理和实现方法。提出了视频处理器在不同增益、不同偏置和TDICCD在不同积分时间下进行像元校正的方法,设计了在现场可编程门阵列(FPGA)平台下进行了程序实现和验证的方法。实验数据分析表明:成像系统单片TDICCD的非均匀性由4.72%降低到0.27%,恶劣环境下TDICCD成像系统的图像非均匀性可以降低2.55%。该像元级校正算法简单,可靠性高,能够满足星上成像的要求;在不同的增益、偏置和积分时间下能够很好地解决TDICCD成像系统的像元响应非均匀性问题。Abstract:To improve the Pixel Response Non-uniformity(PRNU) in a TDICCD mosaic camera, an algorithm was proposed to correct the PRNU between the channels and among the pixels in channels at different gains, deviations and integrated time. Then, a design method was given to implement the algorithm on a Field Programmable Gate Array(FPGA) platform. The experimental results indicate that the problems of PRNU could be solved at different gains, deviations and integrated time in the TDICCD mosaic camera. The PRNU of a single TDICCD could be decreased from 4.72% to 0.27%. In bad circumstance, the PRNU of the single TDICCD could be decreased from 4.68% to 2.13%. The actual image also proves that the pixel correction algorithm has high real time performance, high reliability and stability, and a satisfied result to the requirements of space-projects. It solves the real-time pixel correction problem of the PRNU in TDICCD mosaic cameras.
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