Diffraction Effect in Compressive Sensing Ghost Imaging

Abstract

Compressive sensing ghost imaging has made great progress in recent years because it can reconstruct high-grade object image with less number of samples. In adition, using digital micromirror device (DMD) to set up light field has greatly promoted the development of practical application of ghost imaging, but many problems remained, such as ignoring the changes of light field in propagation. To do this, first of all, analyze the influencing factors of light propagation. The size of the lens makes the diffraction effect more obvious. The actual light field deviates from the preset value which is the result of bright floding. Calculate the intensity spread function of the diffraction limited system and modify the preset light field. However, the modified light field acting as observation matrix can still be reconstructed under the condition of mutual coherence. Experimental results indicate that the modified light field is similar to actual light field and observation matrix can reconstruct high-grade picture. So it is significant to modifify light field by intensity spread function.