工业线阵CCD相机系统测试与噪声评估

发布时间：2018-05-09 20:28

本文选题：CCD相机 + CCD成像系统　；参考：《光学精密工程》2016年10期

【摘要】：为了快速评价工业线阵CCD相机质量,本文选择信噪比为评价因子,建立了测试系统,研究了基于相机输出图像测试相机噪声的方法。分析了线阵CCD相机的噪声,建立了一个基于固定模式和随机噪声的信噪比计算模型,并分析了相关双采样(CDS)过程对电源噪声的影响。设计了一套适于工业场所的相机快速信噪比测试系统,结合理论分析数据和实际测试图像数据,提出了仅通过输出的8bit图片计算各噪声参数的方案。最后,对测试系统引入的光源不均匀性噪声进行了讨论,并证明该实验平台光源符合工业标准EVM1288要求。实验结果表明:当相机模数(AD)转化设置为8.7dB时,输出信噪比可达44dB;若排除光源干扰,输出信噪比可达46dB。该方案简便快捷,满足工业现场对相机信噪比评估的要求。
[Abstract]:In order to quickly evaluate the quality of industrial linear CCD camera, this paper selects SNR as the evaluation factor, establishes a test system, and studies the method of measuring camera noise based on camera output image. This paper analyzes the noise of linear CCD camera, establishes a signal to noise ratio (SNR) calculation model based on fixed mode and random noise, and analyzes the influence of correlation dual sampling (CCD) process on power noise. A set of camera fast signal-to-noise ratio (SNR) measurement system suitable for industrial location is designed. Combining the theoretical analysis data and the actual test image data, the scheme of calculating the noise parameters by only outputting the 8bit pictures is presented. Finally, the non-uniformity noise of the light source introduced in the test system is discussed, and it is proved that the light source of the experimental platform meets the requirements of the industrial standard EVM1288. The experimental results show that the output signal-to-noise ratio (SNR) can reach 44 dB when the camera A / D conversion is set to 8.7dB, and the output SNR can reach 46 dB if the light source interference is excluded. This scheme is simple and fast and meets the requirement of camera SNR evaluation in industrial field.
【作者单位】：武汉大学电子信息学院;武汉大学国际软件学院;武汉大学遥感信息工程学院;武汉大学计算机学院;
【基金】：国家自然科学基金青年科学基金资助项目(No.61501334)
【分类号】：TB852.1

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