探测器噪声对波前编码成像系统图像复原过程影响的理论研究

Detector Noise in the Wavefront Coding Imaging System Recovery Process

波前编码光学系统其成像过程由光学成像和图像复原两部分组成,光学成像过程探测器上所成的编码图像含有噪声,该噪声在图像复原过程将被放大,为了分析探测器噪声对波前编码系统在图像复原过程中产生的影响,通过添加高斯随机噪声来模拟探测器噪声,使用直接逆滤波、维纳滤波和Lucy-Richardson滤波算法,对波前编码成像系统焦点位置和离焦位置的中间模糊图像进行图像复原,并对复原图像评价分析。实验结果表明探测器噪声对波前编码系统的图像复原有较大的影响,验证了波前编码系统对离焦不敏感,并给出含噪声情况下复原滤波器性能的变化。

The imaging process of wavefront coding optical system involves optical imaging and image restoration. The enco- ding image formed on the detector in optical imaging process includes a noise, which will be amplified in the image restora- tion process. In order to analyze the effect of detector noise on the performance of wavefront coding system in the image res- toration process, this paper simulates the detector noise by adding Gaussian random noise, uses direct inverse filtering, Wie- ner filtering and Lucy-Richardson filter algorithms to restore the middle blurred image of the wavefront coding system at the focus position and the defocus position, then evaluates the restored image. Experiment results show that the detector noise has a greater impact on the wavefront coding system in image restoration process, confirm that the wavefront coding system is insensitive to defocus. The changes of performance of recovery filter with noise are obtained.