41 research outputs found
Photoinduced anisotropy in pyrrylfulgide and its application in optical image processing and polarization holography
No full textTwo-photon absorption photochromic optical image storage in indoly-benzylfulgimidePMMA film
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Real-time non-destructive testing of dynamic holograms in doubly-doped LiNbO3 crystals using phase-conjugate technique
No full textApplication of HS-LMBP Hybrid Neural Network Algorithm in Image Denoising
No full textIn order to overcome the problems such as poor global search ability, slow convergence rate, and easy to fall into local minimum values in the image denoising process of traditional BP neural networks, the HS-LMBP hybrid neural network image denoising algorithm is proposed which combines the harmony search algorithm and the LMBP algorithm. The HS-LMBP hybrid neural network algorithm combines the high speed of the LMBP algorithm and the global nature of the HS algorithm, which can be a good improvement to the existing problems of the BP algorithm model. Compared with the Wiener filtering, BP, LMBP and PSO-LMBP model image denoising effects, the denoising model using HS-LMBP neural network algorithm has a better denoising effect
Application of HS-LMBP Hybrid Neural Network Algorithm in Image Denoising
No full textIn order to overcome the problems such as poor global search ability, slow convergence rate, and easy to fall into local minimum values in the image denoising process of traditional BP neural networks, the HS-LMBP hybrid neural network image denoising algorithm is proposed which combines the harmony search algorithm and the LMBP algorithm. The HS-LMBP hybrid neural network algorithm combines the high speed of the LMBP algorithm and the global nature of the HS algorithm, which can be a good improvement to the existing problems of the BP algorithm model. Compared with the Wiener filtering, BP, LMBP and PSO-LMBP model image denoising effects, the denoising model using HS-LMBP neural network algorithm has a better denoising effect
Application of Adaptive Genetic BP Model in Classification of Speech Characteristic Signal
No full textPhotoreaction constants of fulgide films at different wavelengths
No full textTwo kinds of synthesized photochromic fulgide - pyrrylfulgide (F1) and 3-indoly-benzylfulgimide (F2) - are prepared as thin films doped in a polymethyl methacrylate (PMMA) matrix. Under irradiation by 405nm laser, the films convert from the colorless E-form (bleached state) into the C-form (colored state). When the C-forms are irradiated by 488nm, 514nm, 633nm or 650nm laser, the films returns to the E-forms. The photochromic kinetics of them under the irradiation of different wavelength lights (405nm, 488nm, 514nm, 633nm and 650nm) and the two-beam complementary suppression curve of F2 film under the irradiation of 633nm and 405nm lights are experimentally measured, which are simulated by using the first order kinetics and numerical calculation methods and the best simulating values of the photoreaction constants are obtained and compared. Under the irradiation of 633nm light, the photoreaction constants of the bleaching progress in F1 and F2 films (γC&rarrE 633nm) are 1.4×103 cm2/mJ and 2.89×103 cm2/mJ respectively. Under the irradiation of 488nm, 514nm and 650nm lights, the relative values of photoreaction constant γ c&rarr/γC&rarrE633nm are same with the theoretical values getting from the absorption spectra and γE&rarrcF2,40fm =5.5×104cm 2/m. The two-beam complementary suppression curves proved that γ C &rarrEF2,633 and γ E&rarrcF2,405nm getting from the single beam irradiation curves are correct. And it is found that non-uniformity distribution of exciting light intensity has great affection to the deviation of the transmission curve from the first order dynamic curve
