The method of extracting images recorded in the medium that bleaches under exposure to incoherent reading light has been studied theoretically. It is shown that layer-by-layer reading the information may be realized when temporal filtration of the light field with low-frequency cut-off is applied. The most fruitful application of the technique is reconstructing time sequences of images.
A neural network for contour pattern classification using the projective data compression technique is considered. By way of test, the method was applied to the recognition of handwritten characters. Capabilities of the method are demonstrated. A prospect of implementation is discussed.
The possibility of layer-by-layer reading of information in photoreversible medium based on bacteriorhodopsin is considered. We propose to use for information reading the light with wavelength in the absorption spectrum of K- intermediate, which is shifted relative to the absorption spectra of B- and M-intermediates into the long wavelength region. For layer marking, the high concentration of the K- form bacteriorhodopsin molecules is produced by means of two light waves with the wavelength in the absorption spectra of B- and M-intermediates, propagating in opposite directions. The condition of high quality of marking is the sufficiently high clarification of the medium caused by light waves. The stationary as well as nonstationary regimes of marking are considered. The possibility of reproducing the temporal sequences of layer-by-layer written images in nonstationary regime of marking is demonstrated.
A closed multilayer dynamic neural network, unlike a nonclosed one, can form infinite pattern sequences, both periodic and aperiodic. The closing enhances interactions between time pattern sequences and formation of new sequences. Methods of recording time sequences are considered; prospects of use are discussed.
In the paper, issues of using combined holographic media with recording static and dynamic hologram for high-capacity storage are discussed. Some peculiarities of reconstructing holograms by two or more reconstructing light waves in combined medium based on bacteriorhodopsin are considered. The interaction between two plane waves and volume grating that is the sum of static and dynamic ones is studied. It is shown that the multibeam scheme of reading allows us to achieve considerable amplification of diffracted waves, improvement of hologram reconstruction selectivity, and increase of the capacity of the holographic information carrier.
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