We propose a new method of blind deconvolution (BD) suitable for the recovery of truncated blurred images. In practical cases we often encounter truncated images, but they are difficult to treat properly with conventional BD algorithms, since nontruncated blurred images are assumed. The proposed method is based on simulated annealing (SA), to which we introduce an adaptive masking process. After a truncated segment is cut out from the blurred image, the sharp edges surrounding the segment are removed by multiplying the initial window, whose shape is determined with the initial estimate of the point spread function (PSF). A more appropriate estimate for the PSF is obtained from the masked segment based on the SA algorithm, and according to the new estimate of the PSF, the shape of the window is varied. These procedures are iterated until we finally obtain the best possible estimate of the PSF. In the last step, the entire blurred image is deconvolved with the final estimate of the PSF to obtain the recovered image. The effectiveness of the proposed method is confirmed by computer simulation.
A method to measure the phase distribution of a light wave by compensating its wavefront distortion with a liquid crystal spatial light phase modulator (LC-SLPM) is improved by utilizing the double path mode of LC-SLPM. The characteristics of the double path LC-SLPM is examined experimentally, and it is verified that this device is effective for adaptive optics use because it is able to modulate the light phase over 2(pi) rad without causing significant amount of intensity modulation.
Previously we developed the filter bank method that enables to extract from a defocused image the information on the amount of defocus. In this paper, we apply this method to a defocused image with extremely low intensity detectable only with a photon counting camera. Experimental results show that the information of the defocus amount can be extracted from such a blurred photon image and simultaneously the original object is successfully restored.
We experimentally examined the crosstalk of the switching device using BaTiO3 and interconnection mask. BaTiO3 is used to compensate the light loss by two wave mixing.
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