光场衍射在压缩感知鬼成像中的研究

基于压缩感知的鬼成像由于采样次数少,在近些年取得重大的发展。利用数字微反射镜器件(DMD)预置光场实现单臂成像,大大推进鬼成像向实际应用发展,但也存在不少问题,比如传播过程中的光场分布变化。为了解决这个问题,首先分析光场的传播过程,透镜尺寸的限制使得光场衍射影响较大,光斑的叠加导致实际光场变得模糊偏离了预置值。计算衍射受限系统的光强度扩散函数,修正预置光场,修正光场作为观测矩阵仍然满足准确重构的互相干性条件。实验结果表明,修正的光场较好地模拟实际光场,其构成的观测矩阵用于成像,重建图像的质量更高。同样,在实际应用领域,利用光强扩散函数修正预置光场意义重大。

Research of diffraction effect in compressive sensing ghost imaging

Compressive sensing ghost imaging has made great progress in recent years because it has the characteristics of less number of samples.Aiming at optical field distribution change in ghost imaging,the propagation process of light field was analyzed.The size of the lens makes the diffraction effect more obvious.The facula superposition makes actual light field become fuzzy and deviate from the preset value.The light intensity spread function of the diffraction limited system was calculated and the preset light field was revised.However,the revised light field acting as observation matrix can still be reconstructed under the condition of mutual coherence.Experimental results indicate that the revised light field is similar to actual light field and observation matrix can reconstruct high-grade picture.So it is significant to revise preset light field by using light intensity spread function.