Journals >Infrared and Laser Engineering
Contents
2004
Volume: 33 Issue 1
26 Article(s)
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Research Article
Estimation technology of the infrared smoke interference effect
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Facing the serious threaten of IR imaging guided missile, infrared imaging guided countermeasures play a more and more important role nowadays. The domestic and international development of screen smoke technology are presented. To study smoke screen, it's necessary to confirm an estimation technology of it, which Facing the serious threaten of IR imaging guided missile, infrared imaging guided countermeasures play a more and more important role nowadays. The domestic and international development of screen smoke technology are presented. To study smoke screen, it's necessary to confirm an estimation technology of it, which is the main content of this paper. At first, the existed countermeasure effect evaluations of smoke are summarized and classified into experimental measurement and theoretical calculation. In the end, a way for effect evaluation of smoke fading location information is presented..
Infrared and Laser Engineering
- Publication Date: Feb. 01, 2004
- Vol. 33, Issue 1, 1 (2004)
UV warning technology
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UV warning technology developed in the recent twenty years is used for missile approaching warning. The domestic and international research and development of UV warning technology are introduced. The UV transmission in the atmosphere,the UV radiance characteristic of target and background,the UV photoelectric detectorUV warning technology developed in the recent twenty years is used for missile approaching warning. The domestic and international research and development of UV warning technology are introduced. The UV transmission in the atmosphere,the UV radiance characteristic of target and background,the UV photoelectric detectors, and the UV detection technology are discussed. In the end, the tactical applications of the UV warning are introduced..
Infrared and Laser Engineering
- Publication Date: Feb. 01, 2004
- Vol. 33, Issue 1, 5 (2004)
Research on a kind of polarized interferometer's optical system for nanometer measurement
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The interferometer adopted polarized light measurement and polarized light receiver is presented. The transform of the polarized light is analyzed in detail, which can help the design of polarized interferometer and dual-frequency interferometer. The repeatitiveness test indicates that the interferometer's measuremThe interferometer adopted polarized light measurement and polarized light receiver is presented. The transform of the polarized light is analyzed in detail, which can help the design of polarized interferometer and dual-frequency interferometer. The repeatitiveness test indicates that the interferometer's measurement accuracy of repeatitiveness is within 30 nm. The result shows that the interferometer is reliable.If the effects of the environmental factors on the measurement accuracy and the compensation for the enviromental changes are studied, the measurement accuracy will be nanometer level..
Infrared and Laser Engineering
- Publication Date: Feb. 01, 2004
- Vol. 33, Issue 1, 21 (2004)
Optic system effect simulation in IR dynamic scenes simulation
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In the simulation test of IR tracing and searching system or IR warning system by digital image injecting, IR dynamic scenes simulation is the core technology, and optic system effect simulation is the important part of IR dynamic scenes simulation. Since the object is incoherent IR imaging system, imaging effect and iIn the simulation test of IR tracing and searching system or IR warning system by digital image injecting, IR dynamic scenes simulation is the core technology, and optic system effect simulation is the important part of IR dynamic scenes simulation. Since the object is incoherent IR imaging system, imaging effect and image disperse or energey disperse effect in energey domain are only considered for optic system effect. In general, optic system quality can described by MTF. Point-expanded function can be calculated using MTF, and optic system effect model can be established based on point-expanded function. So long as MTF is accurate, the fidelity of optics system effect model established by this way can be guaranteed..
Infrared and Laser Engineering
- Publication Date: Feb. 01, 2004
- Vol. 33, Issue 1, 25 (2004)
Comparison among projecting features of infrared warship target
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In image analysis, horizontal integral projecting and vertical integral projecting algorithms are usually utilized to describe the gray distribution of targets. If targets rotate, it is difficult to find the relationship among the projecting curves of the same targets in different orientations. In order to overcome thiIn image analysis, horizontal integral projecting and vertical integral projecting algorithms are usually utilized to describe the gray distribution of targets. If targets rotate, it is difficult to find the relationship among the projecting curves of the same targets in different orientations. In order to overcome this default, two kinds of statistic methods called circular integral projecting and circular grads integral projecting are proposed based on circular projecting. Furthermore those methods are compared with horizontal integral projecting and vertical integral projecting. The experimental result shows that the curves corresponding to circular integral projecting and circular grads integral projecting own excellent steadiness when target rotates and flexes..
Infrared and Laser Engineering
- Publication Date: Feb. 01, 2004
- Vol. 33, Issue 1, 59 (2004)
Recognition of analog-modulated signals based on a novel RBF network
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Modulation-style recognition of radar signals is an important aspect in electronic warfare. A hybrid RBF training algorithm combined with artificial immune clustering and evolutionary programming is proposed and applied in modulation-style recognition of radar signals. In the algorithm, artificial immunology for data cModulation-style recognition of radar signals is an important aspect in electronic warfare. A hybrid RBF training algorithm combined with artificial immune clustering and evolutionary programming is proposed and applied in modulation-style recognition of radar signals. In the algorithm, artificial immunology for data clustering was used to adaptively determine the amount and the positions of initial RBF centers according to input data set. Then the RBF network was trained with evolutionary programming. Computer simulations demonstrate that the recognition rate of different analog modulation styles designed by the RBF network in this method is high..
Infrared and Laser Engineering
- Publication Date: Feb. 01, 2004
- Vol. 33, Issue 1, 63 (2004)
Airport recognition based on contextual information
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An approach to incorporate contextual information into airport recognition was presented. It was helpful to reduce the ambiguity of objects in the images by utilizing other information referred to as context, which in our case was the identity of the accompanying objects. Airports were typical multi-component class of An approach to incorporate contextual information into airport recognition was presented. It was helpful to reduce the ambiguity of objects in the images by utilizing other information referred to as context, which in our case was the identity of the accompanying objects. Airports were typical multi-component class of objects with obvious orientation. The original image was decomposed into multiple spatial frequences and orientation selective channels by Gabor filters. Each channel corresponded to one feature image. Radon transform was adopted to extract line features from these feature images. According to the knowledge about the structural information of airports, a series of rules to determine the airport in the image were used..
Infrared and Laser Engineering
- Publication Date: Feb. 01, 2004
- Vol. 33, Issue 1, 67 (2004)
Face recognition based on PPCA
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Automatic face recognition was an active research area in the last decade. With the increased importance of security and organization, identification and authentication methods were developed into a key technology in various areas such as entrance control in building. Face recognition method based on probabilistic prinAutomatic face recognition was an active research area in the last decade. With the increased importance of security and organization, identification and authentication methods were developed into a key technology in various areas such as entrance control in building. Face recognition method based on probabilistic principle component analysis (PPCA) was proposed. However, a notable feature of traditional PCA was the absence of an associated probabilistic model for the observed data. A probabilistic formulation of PCA from a Gaussian latent variable model was obtained, which was closely related to statistical factor analysis. The parameters of PPCA could be determined using EM algorithm. In experiments, the proposed methods have been successfully evaluated using two different datasets. The experimental results show that the face recognition method based on PPCA is superior to the method based on the traditional PCA..
Infrared and Laser Engineering
- Publication Date: Feb. 01, 2004
- Vol. 33, Issue 1, 71 (2004)
Two-point nonuniformity correction for IRFPA and its physical motivation
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The two-point nonuniformity correction algorithm for IRFPA is theoretically and perfectly deduced based on Planck Law and the linear response model of infrared detector. The physical motivation of the two-point nonuniformity correction is hereby disserted for the first time. It is theoretically proved that the algorithThe two-point nonuniformity correction algorithm for IRFPA is theoretically and perfectly deduced based on Planck Law and the linear response model of infrared detector. The physical motivation of the two-point nonuniformity correction is hereby disserted for the first time. It is theoretically proved that the algorithm is perfect for nonuniformity correction provided that the response of IRFPA is linear and stable. The residual nonuniformity is initiatively analyzed..
Infrared and Laser Engineering
- Publication Date: Feb. 01, 2004
- Vol. 33, Issue 1, 76 (2004)
Recent development of infrared focal plane arrays nonuniformity correction
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Infrared focal play arrays nonuniformity correction is a developing key technique. Several recent technologies of infrared focal play arrays nonuniformity correction at home and abroad are introduced in detail, including scene-based algebraic algorithm, the adaptive algorithm based on noise-canceling, and the multi-poiInfrared focal play arrays nonuniformity correction is a developing key technique. Several recent technologies of infrared focal play arrays nonuniformity correction at home and abroad are introduced in detail, including scene-based algebraic algorithm, the adaptive algorithm based on noise-canceling, and the multi-point nonuniformity correction based on low order interpolation..
Infrared and Laser Engineering
- Publication Date: Feb. 01, 2004
- Vol. 33, Issue 1, 79 (2004)
Friction compensation of camera stabilizing device based on velocity estimation
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Considering the tracking error caused by friction in camera stabilizing device, a control method of adaptive slide mode is adopted to compensate the friction torque. Furthermore, an improved Eulor method of estimating velocity from position signal is studied in this paper. The application of the two methods in the contConsidering the tracking error caused by friction in camera stabilizing device, a control method of adaptive slide mode is adopted to compensate the friction torque. Furthermore, an improved Eulor method of estimating velocity from position signal is studied in this paper. The application of the two methods in the control system of camera stabilizing device shows that the tracking error caused by friction is weaken effectively, and the methods are also easy to realize..
Infrared and Laser Engineering
- Publication Date: Feb. 01, 2004
- Vol. 33, Issue 1, 83 (2004)
42.24 Mbits/s multi-service atmospheric laser communication system
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A 42.24 Mbits/s atmospheric laser communication system was developed based on the demand for the multi-service atmospheric laser communication in practice. It could achieve the communications of the V.35, E1, RS-232/485, Ethernet, and phone. Design consideration, basic principle and system architecture of the multi-serA 42.24 Mbits/s atmospheric laser communication system was developed based on the demand for the multi-service atmospheric laser communication in practice. It could achieve the communications of the V.35, E1, RS-232/485, Ethernet, and phone. Design consideration, basic principle and system architecture of the multi-service atmospheric laser communication system were demonstrated. The atmospheric laser communication experiment shows that the system can implement the communication with broadband, high speed and low bit-error in the cloudless condition, and availabe distance is 500 m..
Infrared and Laser Engineering
- Publication Date: Feb. 01, 2004
- Vol. 33, Issue 1, 88 (2004)
Power loss analysis of transitional waveguide by the finite-difference beam propagation method
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In order to minish the power loss of transitional bending waveguide and transitional grading waveguide, several shape functions of transitional waveguide are proposed and developed at first. Then they are simulated and analyzed by the finite-difference beam propagation method. Based on it, conditional relations betweenIn order to minish the power loss of transitional bending waveguide and transitional grading waveguide, several shape functions of transitional waveguide are proposed and developed at first. Then they are simulated and analyzed by the finite-difference beam propagation method. Based on it, conditional relations between optimized transitional waveguide shape and the angle of transitional waveguide are found and proposed in math formula. During analyzing and calculating the power losses of transitional waveguide with different shapes with the finite-difference beam propagation methods, it is shown that the FD-BPM is perspicuous and convenient in simulating and analyzing optical waveguide device and units..
Infrared and Laser Engineering
- Publication Date: Feb. 01, 2004
- Vol. 33, Issue 1, 93 (2004)
Design and implementation of VXI slot 0 controller module with IEEE 1394 interface
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At first the principle of VXI slot 0 extended instrument based on IEEE 1394 bus is introduced, and then its logic architecture, software and hardware design and implementation procedure are given. The experimental result demonstrates that the VXI slot 0 controller can work correctly and be integrated with HP serials VXAt first the principle of VXI slot 0 extended instrument based on IEEE 1394 bus is introduced, and then its logic architecture, software and hardware design and implementation procedure are given. The experimental result demonstrates that the VXI slot 0 controller can work correctly and be integrated with HP serials VXI equipments as a measurement system..
Infrared and Laser Engineering
- Publication Date: Feb. 01, 2004
- Vol. 33, Issue 1, 97 (2004)
Research and improvements of ART-2 neural networks
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ART-2 Neural Networks are well applied in clustering, but it discard the important information of amplitude of patterns during the procession of input data. Two improved algorithms are presented after analyzing the defect of ART-2 and experimental result is reported.ART-2 Neural Networks are well applied in clustering, but it discard the important information of amplitude of patterns during the procession of input data. Two improved algorithms are presented after analyzing the defect of ART-2 and experimental result is reported..
Infrared and Laser Engineering
- Publication Date: Feb. 01, 2004
- Vol. 33, Issue 1, 101 (2004)
Diffuse reflection ratio measurement on the surfaces of layered tissues with near infrared light
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Based on the analysis of the transmission of near infrared light in homogeneous tissues, a calculating method of diffuse reflection ratio (DRR) for layered tissue is presented. According to this method, the DRRs of two layers of tissues were calculated, which were consistent with former literatures. By use of this theoBased on the analysis of the transmission of near infrared light in homogeneous tissues, a calculating method of diffuse reflection ratio (DRR) for layered tissue is presented. According to this method, the DRRs of two layers of tissues were calculated, which were consistent with former literatures. By use of this theoretical model, DRRs of two kinds of tissue with different structures are discussed. It shows that DRR of two-layered medium varies with detecting separation in the same tendency with that of former literature..
Infrared and Laser Engineering
- Publication Date: Feb. 01, 2004
- Vol. 33, Issue 1, 107 (2004)
[in Chinese]
Research on a new type of re-entry IFOG
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A new type of re-entry integrate fiber optics gyroscope(IFOG) which can remain the features of low-cost, high-temperature-stability and miniaturization is proposed. By use of the Transition-mode Multifunction Integrated-Optics Chip (TMIOC),it will eliminate the eigen loss caused by the multiple re-entry in fiber-ring. A new type of re-entry integrate fiber optics gyroscope(IFOG) which can remain the features of low-cost, high-temperature-stability and miniaturization is proposed. By use of the Transition-mode Multifunction Integrated-Optics Chip (TMIOC),it will eliminate the eigen loss caused by the multiple re-entry in fiber-ring. It will reduce the total loss of the light and raise the signal noise ratio. It can realize the high sensitivity FOG system without the semiconductor optical amplifier(SOA).The phase modulator (PM) of the TMIOC is made up of the anneal proton exchange waveguide (APE) which has natural high-polarization feature. The Polarization-mode Splitter (PS) of the TMIOC uses the method of dual-module couple and attains the separation of the two polarization modes. The separation ratio can reach 20 dB. The polarized-mode transition (PT) of the TMIOC makes the conversion of the polarization mode TE and TM with the acoustic-optics mode conversion. The efficiency of the conversion can reach over 99%, and the power of the acoustic is less than 20mW.The items of the device are apt to the longer fiber and the less re-entry times at present . It can meet the demands of the high sensitivity FOG system. The improvement of the device , for example , improvement of the response speed and reduction of the couple loss , will make the device be used in the descendant-FOG with shorter fiber , more re-entry times , miniaturization , high sensitivity and low-cost.
Infrared and Laser Engineering
- Publication Date: Feb. 01, 2004
- Vol. 33, Issue 1, 10 (2004)
Parametric characterization of laser beams and beam quality
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The laser beam quality is a topic of current interest. For a real laser, there exists hard-aperture optics more or less. On the other hand, the people are often concerned about the focusability of laser beams in the far field. The extension of the beam propagation factor (M~2 factor) to the apertured case is discussed.The laser beam quality is a topic of current interest. For a real laser, there exists hard-aperture optics more or less. On the other hand, the people are often concerned about the focusability of laser beams in the far field. The extension of the beam propagation factor (M~2 factor) to the apertured case is discussed. Three typical approaches to truncated beams, i.e. the generalized truncated second-moments method, asymptotic analysis and self-convergent-beam-width method, as well as their applications are analyzed. The power in the bucket (PIB) and β-parameter are used to characterize the beam quality in the far field. Then, some practical requirements for the laser beam quality and related characteristic parameters are studied. Finally, a brief discussion about the beam quality control of a complicated high-power laser system as a whole is made in this paper..
Infrared and Laser Engineering
- Publication Date: Feb. 01, 2004
- Vol. 33, Issue 1, 14 (2004)
Thermal focal length and optimal pumping position of Nd: NaY(WO4)2crystal
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Thermal focal length of fiber-coupling LD end-pumped Nd:NYW laser were measured within the range of pump power from 3.5 to 6.5 W with a method of nonstable cavity, and the results were compared with the theoretical results. Meanwhile, the optimal pump position was investigated under different pump powers. The experimenThermal focal length of fiber-coupling LD end-pumped Nd:NYW laser were measured within the range of pump power from 3.5 to 6.5 W with a method of nonstable cavity, and the results were compared with the theoretical results. Meanwhile, the optimal pump position was investigated under different pump powers. The experimental results are consistent with theoretical prediction and the phenomena are interpreted reasonably..
Infrared and Laser Engineering
- Publication Date: Feb. 01, 2004
- Vol. 33, Issue 1, 18 (2004)
[in Chinese]
License-plate location and character segmentation in complex vehicle images
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License-plate location and character segmentation are two key components of the automatic vehicle license recognition system. An edge-texture-color based algorithm to locate the plate region and a template matching based algorithm to segment characters are proposed. Using these algorithms and a character recognition keLicense-plate location and character segmentation are two key components of the automatic vehicle license recognition system. An edge-texture-color based algorithm to locate the plate region and a template matching based algorithm to segment characters are proposed. Using these algorithms and a character recognition kernel, an automatic vehicle license recognition system was finished. The performance of the system was investigated on many real car images with complex background captured under various illumination conditions. The experimental results show that the proposed algorithms have high accuracy and robustness..
Infrared and Laser Engineering
- Publication Date: Feb. 01, 2004
- Vol. 33, Issue 1, 29 (2004)
Novel algorithm of image restoration
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In order to reduce the complexity of calculation while processing large decreased image, an image restoration algorithm based on least square has been developed. When putting it into implementation, a new method named ally-template has been proposed, which parrys transform of frequency. Its algorithm architecture is eaIn order to reduce the complexity of calculation while processing large decreased image, an image restoration algorithm based on least square has been developed. When putting it into implementation, a new method named ally-template has been proposed, which parrys transform of frequency. Its algorithm architecture is easily implemented. The experimental results demonstrate this approach is effective..
Infrared and Laser Engineering
- Publication Date: Feb. 01, 2004
- Vol. 33, Issue 1, 34 (2004)
人类视觉注意机制在目标检测中的应用Applications of human visual attention mechanisms in object detection
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Two models of visual attention which are consistent with human visual perception are introduced. Based on these two models, an ATR algorithm employing attention mechanisms with bottom-up and top-down control strategies is developed. A multi-channel representation of the input image was obtained by a bank of Gabor filteTwo models of visual attention which are consistent with human visual perception are introduced. Based on these two models, an ATR algorithm employing attention mechanisms with bottom-up and top-down control strategies is developed. A multi-channel representation of the input image was obtained by a bank of Gabor filters, corresponding to multiple scales and multiple orientations. Full-wave rectification of each channel and contrast gain control among the channels were performed sequentially to get orientation feature maps with multiple scales and multiple orientations. The so-called salient map was the linear combination of these orientation feature maps. The experimental result with ship detection is given by use of bottom-up control strategy only. The objects for detection are effectively enhanced on the result map..
Infrared and Laser Engineering
- Publication Date: Feb. 01, 2004
- Vol. 33, Issue 1, 38 (2004)
Fast algorithm to realize image stabilization
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The importance of image stabilization to warship photoelectricity equipment and varieties of image stabilization technique are introduced. A new algorithm is proposed to realize electronic image stabilization. The algorithm takes minimum square error and spatial correlation as matching function and adapts four-step seaThe importance of image stabilization to warship photoelectricity equipment and varieties of image stabilization technique are introduced. A new algorithm is proposed to realize electronic image stabilization. The algorithm takes minimum square error and spatial correlation as matching function and adapts four-step search algorithm to calculate motion vectors. The result is compared with that of full search algorithm. The experimental results show that this algorithm may produce stabilized series of images..
Infrared and Laser Engineering
- Publication Date: Feb. 01, 2004
- Vol. 33, Issue 1, 43 (2004)
New method of IR small dim targer detection in big clutter background
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A new method of IR small dim target detection based on big clutter background was provided. It worked well in heavy cloud and big moving clutter background. After analyzing the characters of big clutter background IR images, a new method was provided to detect the target using rectangle structure cell to eliminate noisA new method of IR small dim target detection based on big clutter background was provided. It worked well in heavy cloud and big moving clutter background. After analyzing the characters of big clutter background IR images, a new method was provided to detect the target using rectangle structure cell to eliminate noise based on morphological filter operator. Then, the later image was processed by doubled gated filter. The experiments process real data, and the results meet well and easy to realize by hardware..
Infrared and Laser Engineering
- Publication Date: Feb. 01, 2004
- Vol. 33, Issue 1, 47 (2004)
Resistible noise approach of infrared image contrast enhancement
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A kind of infrared image threshold denoising and enhancement method based on discrete stationary wavelet transform and non-linear gain was given. After making discrete stationary wavelet transform to an infrared image, denoising was done by the method given in the high frequency subbands which was in the better resolutA kind of infrared image threshold denoising and enhancement method based on discrete stationary wavelet transform and non-linear gain was given. After making discrete stationary wavelet transform to an infrared image, denoising was done by the method given in the high frequency subbands which was in the better resolution levels and enhancement was done by combining denoising method with non-linear gain method in the high frequency subbands which was in the worse resolution levels. According to the experimental result, the given algorithm can reduce the noise of infrared image effectively while it enhances the contrast of infrared image well. In visual quality, the algorithm is better than the traditional unshaped mask method and histogram equalization method..
Infrared and Laser Engineering
- Publication Date: Feb. 01, 2004
- Vol. 33, Issue 1, 50 (2004)
Application of wavelet domain Wiener filtering analysis to noise elimination in star-image denoising
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Wavelet threshold is simple and available in image procession, but the Wiener filtering is optimal for any space in the sense of MSE. A wavelet domain Wiener filtering is developed. The design and the application in star-image denoising of Wiener filtering are proceeding. The experimental result shows the Wiener filterWavelet threshold is simple and available in image procession, but the Wiener filtering is optimal for any space in the sense of MSE. A wavelet domain Wiener filtering is developed. The design and the application in star-image denoising of Wiener filtering are proceeding. The experimental result shows the Wiener filtering is better than the standard wavelet thresholding method..
Infrared and Laser Engineering
- Publication Date: Feb. 01, 2004
- Vol. 33, Issue 1, 55 (2004)
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