Applied optics
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Using computer simulations, we investigate the performance of a minimum-mean-square-error filter for input-scene noise that is spatially nonoverlapping (disjoint) with a target for a limited set of images. Different input-scene-noise statistics are used to test the filter performance. ⋯ We show that, for the images tested here, the performance of the minimum-mean-square-error filter is not sensitive to errors in noise statistics and the filter can detect the target even if a considerable error exists. The discrimination capability and the illumination sensitivity of the minimum-mean-square-error filter are also tested.
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Optoelectronic wavelet-processor implementations based on Smartt interferometry are described for both one-dimensional (1-D) and two-dimensional (2-D) wavelet transforms. The 1-D processor study focuses on the processor's capability to perform the wavelet transform when the wavelets are defined in the time domain. The experimental results indicate that the system preserves all the phase information of the selected mother wavelets and thus delivers the true wavelet transform. ⋯ A pair of prototype processors that incorporates.the 1-D and the 2-D systems has been built and tested to mechanical vibrations. High-quality reconstructed images were also obtained from the experimental data. The proposed systems have great potential for many practical applications.
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Conical ring emission from a short-cavity dye laser has been observed and modeled as Kastler rings, that is, the high-angle emission modes of a plano-plano (Fabry-Perot) laser cavity in agreement with the predictions made 31 years ago by Kastler [Appl. Opt. 1, 17 (1962)]. The excitation of the discrete rings is due to a transfer of energy from the axial modes rather than to spontaneous emission. The mechanism for energy transfer is argued to be scattering of light from imperfections on the mirror surfaces.
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Third-order aberrations of holograms recorded on the quadrics of revolution for small fields of view have been investigated. The possibilities of compensating some aberrations for lenses recorded on the quadrics of revolution have been studied in more detail. This paper shows that the most simple aberration coefficients for holograms recorded on quadrics of revolution are for spherical holograms.
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This errata Letter enumerates two problems in the original paper.