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检索条件"任意字段=Conference on Optical Pattern Recognition XXIV"

共 28 条记录，以下是1-10 订阅

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optical image processing and pattern recognition algorithms for optimal optical data retrieval

Optical image processing and pattern recognition algorithms ...

引用

conference on optical pattern recognition xxiv

作者： Walker, Brian Lu, Thomas Stuart, Sean Reyes, George Chao, Tien-Hsin CALTECH Jet Prop Lab Pasadena CA USA

ISBN: (纸本)9780819495396

Automatic pattern recognition algorithms are implemented to correct distortion and remove noise from the optical medium in the multi-channel optical communication systems. The post-processing involves filtering and correlation to search for accurate location of every optical data element. Localized thresholding and neural network training methods are used to accurately digitize the analog optical images into digital data pages. The goal is to minimize the bit-error-rate (BER) in the optical data transmission and receiving process. Theoretical analysis and experimental tests have been carried out to demonstrate the improved optical data retrieval accuracy.

关键词： multi-channel optical communication data retrieval channel alignment analog-to-digital conversion bit-error-rate thresholding pattern recognition neural networks

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Reverberation in a Dispersive Medium

Reverberation in a Dispersive Medium

引用

conference on Automatic Target recognition XX - Acquisition, Tracking, Pointing, and Laser Systems Technologies xxiv - and optical pattern recognition XXI

作者： Cohen, Leon CUNY New York NY 10021 USA

We study by way of simulations the creation and propagation of noise in a dispersive medium. The noise is generated as the sum of elementary signals and we study the noise like behavior in regards to the properties of... 详细信息

ISBN: (纸本)9780819481603

关键词： Interference (communication) Projection systems Control systems Target detection Active sonar Automatic target recognition Automatic tracking optical tracking Statistical modeling Tin

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Optimum and Applications of Photorefractive Spatial Light Modulator in optical pattern recognition

Optimum and Applications of Photorefractive Spatial Light Mo...

引用

conference on Automatic Target recognition XX - Acquisition, Tracking, Pointing, and Laser Systems Technologies xxiv - and optical pattern recognition XXI

作者： Li, Xiujian Hu, Wenhua Jia, Hui Yang, Jiankun Yang, Yisheng Guo, Shaofeng Natl Univ Def Technol Coll Sci Changsha 410073 Hunan Peoples R China

ISBN: (纸本)9780819481603

With excellent physical properties the photorefractive crystals, such as BSO (Bi(12)SiO(20)), BaTiO(3) and GaAs materials, have, can be widely used in optical correlator to implement auto pattern recognition. As the basic devices in optical correlator, the properties of optically-addressed spatial light modulator are very important. By analyzing the dynamic process of the BSO spatial light modulator, especially the changes of the read-out light while in writing under various operation modes, the distinctness between various operation modes is summarize. Furthermore, considered with the photo-induced current pulses, the method to optimize the BSO spatial light modulator is proposed. The BSO spatial light modulator working in optimum operation mode is used to design a optical correlator to implement auto pattern recognition.

关键词： optical pattern recognition optical correlator Photorefractive spatial light modulator Operation mode Operation speed BSO

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Moments in a Random Medium with Dispersion

Moments in a Random Medium with Dispersion

引用

conference on Automatic Target recognition XX - Acquisition, Tracking, Pointing, and Laser Systems Technologies xxiv - and optical pattern recognition XXI

作者： Yang, Y. Cohen, L. CUNY New York NY 10021 USA

Previously we have given explicit expressions for the moments of a pules propagating in a dispersive medium. Liu and Yeh have given the moments for a pulse in a random medium with no dispersion. In this paper we deriv... 详细信息

ISBN: (纸本)9780819481603

关键词： Wave propagation Dispersion Acoustics Automatic target recognition Automatic tracking Fiber optics Laser applications Laser systems engineering optical tracking Radar

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MINACE filter realization as computer generated hologram for 4-f correlator

MINACE filter realization as computer generated hologram for...

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conference on optical pattern recognition xxiv

作者： Evtikhiev, Nikolay N. Shaulskiy, Dmitriy V. Zlokazov, Evgeny Yu. Starikov, Rostislav S. Natl Res Nucl Univ MEPhI Moscow Russia

ISBN: (纸本)9780819495396

optical correlators are well known to be perspective for real time image recognition. Application of distortion invariant filters (DIF) provides image recognition with increased speed of correlation image matching. Minimum noise and correlation energy filters (MINACE filters) provide good recognition in the case of gray-scale input images. These filters possess a good mathematical basis and can be efficiently implemented in digital processing systems or in hybrid opto-digital correlators at a high rate. This paper is subjected to synthesis and realization of MINACE filters for 4-f correlator as computer generated holograms (holographic filters).

关键词： computer generated hologram optical correlators MINACE filter minimum noise and correlation energy filter pattern recognition distortion invariant filters

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Wavelet-filter joint-transform correlation applied to the recognition of polarization-enhanced subsurface land mine patterns in highly cluttered passive imagery

Wavelet-filter joint-transform correlation applied to the re...

引用

conference on Automatic Target recognition XX - Acquisition, Tracking, Pointing, and Laser Systems Technologies xxiv - and optical pattern recognition XXI

作者： El-Saba, Aed Alsharif, S. Stripathi, R. Univ S Alabama Dept Elect & Comp Engn Mobile AL 36688 USA

ISBN: (纸本)9780819481603

Efficient recognition and clearance of subsurface land mine patterns has been one of the challenging humanitarian and military tasks. Among the several subsurface land mine patterns recognition techniques available, passive imaging techniques are more convenient, safer with good probability of recognition. There exist extensive applications where the joint-transform correlation algorithms have been used for efficient pattern recognition. However, among the several pattern recognition algorithms exist for subsurface land mines, the joint-transform correlation ones has been underrepresented. This paper presents the application of an efficient wavelet-filter joint transform correlation (WFJTC) algorithm for the recognition of passive imagery of subsurface land mines in highly cluttered scenarios, using intensity and polarization-based imagery. We further improve the recognition efficiency of the WFJTC proposing a combined optical-digital enhancement approach. Improvements will be justified using correlation performance metrics.

关键词： pattern recognition subsurface land mines Joint-transform correlation polarization-based enhancement combined enhancement

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Light-driven robotics for nanoscopy

Light-driven robotics for nanoscopy

引用

conference on optical pattern recognition xxiv

作者： Gluckstad, Jesper Palima, Darwin Tech Univ Denmark Dept Photon Engn DTU Foton DK-2800 Lyngby Denmark

ISBN: (纸本)9780819495396

The science fiction inspired shrinking of macro-scale robotic manipulation and handling down to the micro- and nanoscale regime opens new doors for exploiting the forces and torques of light for micro- and nanoscopic probing, actuation and control. Advancing light-driven micro-robotics requires the optimization of optical forces and torques that, in turn, requires optimization of the underlying light-matter interaction. This report is two-fold desribing the new use of proprietary strongholds we currently are harnessing in the Programmable Phase Optics in Denmark on new means of sculpting of both light and matter for robotically probing at the smallest biological length scales.

关键词： nano-biophotonics optical robotics spatial light modulation nanoscopy optical manipulation

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Real-time Intensity Filtering with Organic Photorefractive Materials via Four Wave Mixing

Real-time Intensity Filtering with Organic Photorefractive M...

引用

conference on Automatic Target recognition XX - Acquisition, Tracking, Pointing, and Laser Systems Technologies xxiv - and optical pattern recognition XXI

作者： Haji-saeed, Bahareh Woods, Charles L. Kierstead, John Peyghambarian, Nasser Yamamoto, Michiharu Khoury, Jed USAF Res Lab Sensors Directorate Hanscom AFB MA 01731 USA Solid State Sci Corp Hollis NH 03049 USA Univ Arizona Opt Sci Tucson AZ 85721 USA Nitto Denko Tech Oceanside CA 92058 USA

ISBN: (纸本)9780819481603

In this paper, we exploit the nonlinearity inherent in four-wave mixing in organic photorefractive materials and demonstrate edge enhancement, contrast conversion, and defect enhancement in a periodic structure. With the availability of these materials, which have large space-bandwidth products, edge enhancement, contrast conversion and defect enhancement are possible.

关键词： photorefractive optics nonlinear optical signal processing optical nonlinearities in organic materials

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Multi-class target recognition based on adaptive feature selection

Multi-class target recognition based on adaptive feature sel...

引用

conference on Automatic Target recognition XX - Acquisition, Tracking, Pointing, and Laser Systems Technologies xxiv - and optical pattern recognition XXI

作者： Wang, Yuehuan Yao, Wei Song, Yunfeng Sang, Nong Zhang, Tianxu Huazhong Univ Sci & Technol Inst Pattern Recognit & AI Wuhan 430074 Peoples R China Natl Key Lab Sci & Tech Multi Spectral Informat Proc Technol Wuhan 430074 Peoples R China

ISBN: (纸本)9780819481603

In this paper, a new approach of multi-class target recognition is proposed for remote sensing image analysis. A multi-class feature model is built, which is based on sharing features among classes. In order to make the recognition process efficient, we adopted the idea of adaptive feature selection. In each layer of the integrated feature model, the most salient and stable feature are selected first, and then the less ones. Experiments demonstrated the approach proposed is efficient in computation and is adaptive to scene variation.

关键词： remote sensing image adaptive feature selection multiclass target recognition

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Coherent optical implementations of the fast Fourier transform and their comparison to the optical implementation of the quantum Fourier transform

Coherent optical implementations of the fast Fourier transfo...

引用

conference on optical pattern recognition xxiv

作者： Young, Rupert C. D. Birch, Philip M. Chatwin, Chris R. Univ Sussex Sch Engn & Informat Dept Engn & Design Brighton BN1 9QT E Sussex England

ISBN: (纸本)9780819495396

optical structures to implement the discrete Fourier transform (DFT) and fast Fourier transform (FFT) algorithms for discretely sampled data sets are considered. In particular, the decomposition of the FFT algorithm into the basic Butterfly operations is described, as this allows the algorithm to be fully implemented by the successive coherent addition and subtraction of two wavefronts (the subtraction being performed after one has been appropriately phase shifted), so facilitating a simple and robust hardware implementation based on waveguided hybrid devices as employed in coherent optical detection modules. Further, a comparison is made to the optical structures proposed for the optical implementation of the quantum Fourier transform and they are shown to be very similar.

关键词： coherent optical Fourier transform quantum Fourier transform discrete optical Fourier transform fast Fourier transform

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