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This work deals with the fusion of SAR and optical data for land cover monitoring. We first propose to use co-registered optical data as a guide for nonlocal SAR image despeckling. Then, we fuse filtered Sentinel-1 SAR data with optical Sentinel-2 data for land-use classification. Experiments show that using optical-driven despeckled SAR data largely improves classification accuracy w.r.t using the...
There is growing interest of the successful application of double random phase encoding in optical encryption techniques. Nevertheless, this method has some weaknesses such as the problem of optical axis alignment. A few modified schemes have been proposed in order to improve the misalignment but not for the DRPE. This paper addresses a simulated solution of DRPE scheme based on 4f optically system...
We present two optical arrangements for the implementation of polarimeters based on the conical refraction phenomenon, occurring on biaxial crystals (BC). The proposed set-ups keep all the benefits related to BC based polarimeters, but decrease costs and complexity when compared with existing alternatives. Whereas one of the proposals allows us to perform linear polarization metrology, the second...
This work is the presentation of a new imaging technique which enables near real time multispectral acquisition of the so called "Degree Of Polarization" (DOP) in polarimetry with particular attention to biomedical applications. The scientific case for this kind of technique is the study of light propagation in turbid medium, which is the generically representation of a biological medium...
Image encryption is distinct from text encryption. This difference can be attributed to the fact that an image consists of a large amount of data, thereby resulting in low efficiency of real-time image encryption. In this paper, we propose a novel scheme for secure real-time image transmission. A method for image encryption is applied using optical computing technologies which inherently deal with...
We present the use of swept wavelength interferometry for distributed fiber-optic temperature measurements in a nuclear reactor. The sensors consisted of 2-m segments of commercially available, single mode optical fibers. The interrogation technique is based on measuring the spectral shift of the intrinsic Rayleigh backscatter signal along the optical fiber and converting the spectral shift to temperature.
Based on the three-fiber-optic grid interferogram technique, a shape sensing approach has been proposed and demonstrated in this paper. The square and hexagon grid interferometric fringe pattern formed by the fiber-optic interferometric grid generator has been designed and performed. The designing and realizing methods of the fiber-optic interferometric grid pattern by using three PM fibers are discussed...
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