Research on Iterative Method of Wavefront Reconstruction for Imaging through Turbid Medium

摘要

The problem of the imaging through turbid medium such as fog, haze and human tissue has always been the focus ofattention. The turbid medium destroys the wavefront of the incident beam, so the key to the recovery of the image isthe reconstruction process of the wavefront. The spatial light modulator (SLM) is employed to reconstructs thewavefront digitally. In order to realize imaging through the turbid medium, a prior image is restored at the targetlocation in the simulation, and the phase modulation of the SLM is obtained by the advanced genetic algorithm. Thenthe priori image is replaced with the new image to be restored. According to the optical memory effect, the newimage can be imaging at the target location. The optical memory effect was tested using a series of circular spots ofdifferent sizes, and the results showed that the recovery ability gradually decreased with the increased image size.Finally, the curve of the cost function with the number of iterations in 7 different population is analyzed. The resultsshow that the convergence value increases first and then stops with the increase of the group, and the convergencerate is not positively correlated with the group size. So choosing the right group size makes a lot of sense for imagerestoration.