A method of image restoration technology based on parallel phase diversity algorithm

摘要

Although the phase diversity method is an effective way to detect wave-front and restore image, it is difficult to beachieve its real time application on DSP or FPGA. The main of disadvantage of method is a great computation when it isused to estimate the wave-front phase aberration and restore the degraded images. In this paper, a parallel phasediversity method is deeply researched and the expression of the evaluation function is further clarified according thetheory of Nijboer-Zernike polynomial. An outdoor image restoration verification system is established. The structure ofan ordinary telescope is modified, so that it can acquire two images on the focal plane and the out-of-focus plane of theimaging system. The image objects are a chessboard at a distance of 1.1km and a worker in a construction site at adistance of 4.5km outside the laboratory window. The results indicate that the restoration image has a higher resolution.No-reference assessment methods are adopted to evaluate the quality of images. The FI value of restoration image ofchessboard improved 1.478 times, and the LS value improved 2.178 times. The FI value of restoration image of workerimproved 4.227 times, and the LS value improved 1.623 times.