基于估计方法的CMOS图像传感器列固定模式噪声校正方法

Column fixed pattern noise correction of the CMOS image sensor based on estimation method

CMOS图像传感器的列固定模式噪声对图像质量的影响非常严重。在分析CMOS图像传感器固定模式噪声产生机理、噪声特性以及其在输出图像中的表现的基础上,提出了一种针对CMOS图像传感器中列固定模式噪声的校正方法。该方法利用CMOS图像采集系统对积分球发出的均匀平行光束进行多次采样并建模来对列固定模式噪声进行估计,然后将估计结果应用于CMOS图像硬件采集系统进行列固定模式噪声的校正,固定模式噪声的校正在FPGA中使用查找表方法实现。实验结果表明该方法可以有效消除列固定模式噪声,改善图像质量。

The column fixed pattern noise （CFPN） of the CMOS image sensors have severe influence on image quality. A column fixed pattern noise correction method for CMOS image sensors was proposed based on the analysis of emerge mechanism, noise characteristic and the behavior in the output image of the fixed pattern noise. It sampled the uniform and parallel light source which radiated from a integrating sphere more times use a CMOS image acquiring system and then estimated the column fixed pattern noise using these images. Then, the estimation result was used to correct the column fixed pattern noise in the CMOS image acquisition system. Experimental results show that with this method, the fixed pattern noise can be effectively reduced and the quality of the image can be increased.