Although the phase diversity method is an effective way to detect wave-front and restore image, it is difficult to be achieve its real time application on DSP or FPGA. The main of disadvantage of method is a great computation when it is used to estimate the wave-front phase aberration and restore the degraded images. In this paper, a parallel phase diversity method is deeply researched and the expression of the evaluation function is further clarified according the theory of Nijboer-Zernike polynomial. An outdoor image restoration verification system is established. The structure of an ordinary telescope is modified, so that it can acquire two images on the focal plane and the out-of-focus plane of the imaging system. The image objects are a chessboard at a distance of 1.1km and a worker in a construction site at a distance 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 of chessboard improved 1.478 times, and the LS value improved 2.178 times. The FI value of restoration image of worker improved 4.227 times, and the LS value improved 1.623 times.
With the development of laser technology, higher requirement is presented on measurement technology of laser beam. The measurement technology of laser beam develops from the original Knife-edge method, Slit scanning method into the latter Shack-Hartmann method. The test index of laser beam also develops from originally testing power, wavelength into putting much value on the testing of wavefront, and characteristic value of a laser beam. In this paper, we go deep into study the method of measurement of laser beam and present a laser beam measurement method which is takes photos on focal plane to calculate the wavefront and the laser characterization. The difference between Shack-Hartmann method and this method is analyzed. The results of experiment show that, this method is simple apparatus, and high precision, and it will be a development tendency on the laser beam measurement field, in the future.
In this paper includes the superiority of analyzing of laser beam based on wavefront sensing in focal plane. It is introduced that two mainly basic principles of the technology of wavefront sensing. The correctness of this method is shown by the results of experiment. And the arrangement of experiment is simple. Experiment error is reduced easily. Application prospects and feasibility are proved sufficiently.