Journals >Journal of Infrared and Millimeter Waves
Contents
2017
Volume: 36 Issue 4
20 Article(s)
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Analysis of ultraviolet and infrared dual-color focal-plane array detector based on Pt/CdS and InSb junctions
LI Qing, BAI Jie, LV Yan-Qiu, HU Wei-Da, CHEN Xiao-Shuang, and LU Wei
Based on finite difference time domain method (FDTD) and finite element method (FEM), the mechanism of Pt/CdS and InSb ultraviolet-infrared dual-color focal-plane arrays was investigated. It was found that a high ultraviolet photo response can be achieved for Pt/CdS Schottky junction under an ultrathin Pt top contact. Based on finite difference time domain method (FDTD) and finite element method (FEM), the mechanism of Pt/CdS and InSb ultraviolet-infrared dual-color focal-plane arrays was investigated. It was found that a high ultraviolet photo response can be achieved for Pt/CdS Schottky junction under an ultrathin Pt top contact. Further simulations show that the ultrathin top contact can efficiently couple the infrared radiation for the dual-color focal-plane array detector. The center to center spacing of each pixel of 50 μm in the ultraviolet and infrared dual-color focal-plane array detector based on Pt/CdS and InSb junctions can significantly reduce crosstalk. Our work provides fundamental guidance for optimization and design of ultraviolet and infrared dual-color detector..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 4, 385 (2017)
Enhanced infrared absorption of NiCr Film fabricated on LiTaO3 crystal material for 14~16 μm application
LIU Zi-Ji, LIANG Zhi-Qing, HE Xuan, MA Zhen-Dong, GOU Jun, and JIANG Ya-Dong
Nano-scale metallic films have been proven to be effective infrared absorption layers for pyroelectric detectors operated at 14~16 μm spectral range for space applications. The infrared absorption improvement can be achieved by adjusting the thickness and surface characteristics of the nano-scale Nickel-chromium (NiCr)Nano-scale metallic films have been proven to be effective infrared absorption layers for pyroelectric detectors operated at 14~16 μm spectral range for space applications. The infrared absorption improvement can be achieved by adjusting the thickness and surface characteristics of the nano-scale Nickel-chromium (NiCr) film deposited on the LT (lithium tantalite) crystal materials. By regulating the thickness of the crystal materials, the absorption wavelength is adjustable as well by changing the depth of the anti-reflection cavity. To enhance the infrared absorption further, chemical corrosion is applied on this film, which generates a rough nano-scale surface structure and greatly increases the absorption surface area. By combining these two methods, absorption at specified infrared wavelength could be distinctly enhanced, and the manufacturing process is fully compatible and easy to realize. Experiment results suggest that the absorption performance which could be controlled agrees well with the simulation and design..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 4, 389 (2017)
Affects of flip-chip structure on the performance of THz detector with log periodic antenna
HAO Hai-Dong, SHI Jun-Yu, CHENG Li-Feng, ZHAO Xiu-Chen, WANG Bing, and LV Xin
This paper presents a novel flip-chip (FC) structure design for 340 GHz Schottky diode detectors, which was designed and fabricated based on the gallium arsenide (GaAs) process. A ceramic thin-film supporting layer was used to provide a package for such detector. Conductive adhesive is typically used as attachment mateThis paper presents a novel flip-chip (FC) structure design for 340 GHz Schottky diode detectors, which was designed and fabricated based on the gallium arsenide (GaAs) process. A ceramic thin-film supporting layer was used to provide a package for such detector. Conductive adhesive is typically used as attachment material between the antenna and output circuit. The behaviour of terahertz (THz) detectors with and without the novel FC structure was studied. For comparison, the FC structure model and wire bonding structure one (free of FC) were characterized using the same test system. A comparison analysis for the gains of the THz detector measured with and without the ceramic thin-film layer indicates that the novel FC structure offers a low-cost and practical solution for packaging the array of THz detectors..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 4, 393 (2017)
Volatilization characteristics analysis of ammonia from soil by straw returning to the field based on the infrared spectroscopy technology
HE Ying, ZHANG Yu-Jun, YOU Kun, GAO Yan-Wei, ZHAO Nan-Jing, and LIU Wen-Qing
The infrared absorption spectral characteristics of ammonia were studied. Moreover, the quantitative inversion algorithm model was established, especially the correlation analysis and temperature correction function were optimized. The ammonia volatilization experiment was carried out in the demonstration area in GuoyaThe infrared absorption spectral characteristics of ammonia were studied. Moreover, the quantitative inversion algorithm model was established, especially the correlation analysis and temperature correction function were optimized. The ammonia volatilization experiment was carried out in the demonstration area in Guoyang, Anhui in 2015 by the ammonia regional monitoring system based on Open-path Tunable Diode Laser Absorption Spectroscopy (OP-TDLAS). Then, ammonia dynamic volatilization character of corn and wheat straw returning to the field was studied. The monitoring results show that the ammonia concentration has a certain diurnal variation trend: it increased during the daytime and got to the maximum value at midday, then reduced gradually at night to the minimum. The typical hourly concentration varied from 0.6×10-3 to 1.34×10-3 mmol/mol in summer, and it varied from 1.14×10-3 to 1.82×10-3 mmol/mol in autumn. In autumn, the maximum daily average of ammonia volatilization from corn straw returning was 4.6×10-4 mmol/mol, and it was 1.7×10-3 mmol/mol from wheat straw returning in summer. The results indicate that the emission concentration rises significantly after more than one month of straw returning which has some certain seasonal difference in farmland scale. This infrared spectroscopy technology provides technical support for clarifying the ammonia emission rules in soil environment..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 4, 397 (2017)
Effect of optical basicity and energy transfer on near-infrared luminescence in Bi/Yb3+co-doped germanate glasses
WANG Rong-Fei, ZHOU Zhi-Wen, LIU Jing, YANG Jie, SUN Tao, and YANG Yu
Bi/Yb3+ co-doped germanate glasses were prepared by conventional melting-quenching technique. Near infrared (NIR) luminescence properties in Bi/Yb3+ co-doped germanate glasses were investigated by the absorption spectrum, NIR luminescence spectra, and fluorescence lifetime measurement. NIR luminescence of both Yb3+ andBi/Yb3+ co-doped germanate glasses were prepared by conventional melting-quenching technique. Near infrared (NIR) luminescence properties in Bi/Yb3+ co-doped germanate glasses were investigated by the absorption spectrum, NIR luminescence spectra, and fluorescence lifetime measurement. NIR luminescence of both Yb3+ and Bi ions was observed simultaneously, either under 980 or 808 nm excitation LD. The results show that ET process existed between Bi-related NIR emission centre and Yb3+ ions. With the increasing in Yb3+ ions concentration, both ET efficiency from Yb3+ ions to Bi ion and optical basicity of glass matrix are increased. The competitive effects of enhancing by the ET process and weakening by optical basicity on NIR luminescence properties of Bi ions were investigated..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 4, 403 (2017)
Three-dimensional near-field surveillance imaging using W-band system
CHENG Hang, ZHENG Hai-Tao, JING Han-Dan, LI Shi-Yong, and SUN Hou-Jun
A W-band stepped-frequency three-dimensional near-field surveillance imaging system together with an effective radar imaging algorithm is presented. W-band signal is able to penetrate common clothing barriers to form an image of a person as well as any concealed items. Performing the image reconstruction procedure in tA W-band stepped-frequency three-dimensional near-field surveillance imaging system together with an effective radar imaging algorithm is presented. W-band signal is able to penetrate common clothing barriers to form an image of a person as well as any concealed items. Performing the image reconstruction procedure in the frequency–wavenumber domain, the algorithm is able to completely compensate the wavefront curvature in the near field through interpolation process. The interpolation relationship in frequency–wavenumber domain between sampled data and desired data was demonstrated. Moreover, the difference between algorithm model and experimental data are revealed. High range resolution and lateral resolution were obtained by emitting wideband stepped frequency signal and adopting high operating frequency. The cross-range resolution of the imaging result is better than 5 mm. The scheme of imaging system is described in detail along with a set of imaging results to show its superior imaging precision and sensitivity compared with existing Ka-band equipment..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 4, 408 (2017)
AStudy on the structural and electrical properties of MgxNi1-xMn2O4 thin films
ZHANG Zeng-Hui, LIU Fang, HOU Yun, and DI Wen-Qi
The MgxNi1-xMn2O4(MNM x=0, 0.05, 0.10, 0.15, 0.20) films were grown on Al2O3 substrate by chemical solution deposition method. The effect of Mg doping on the structural properties of MNM thin films was studied by x-ray diffractomer and field emission scanning electron microscopy. The results show that the MNM films havThe MgxNi1-xMn2O4(MNM x=0, 0.05, 0.10, 0.15, 0.20) films were grown on Al2O3 substrate by chemical solution deposition method. The effect of Mg doping on the structural properties of MNM thin films was studied by x-ray diffractomer and field emission scanning electron microscopy. The results show that the MNM films have a single cubic spinel structure and the films are smooth and uniform, which have good crystallinity. The electrical measurements show that the conduction of MNM thin films can be described by a variable range hopping model. The values of resistivity, characteristic temperature T0, temperature coefficient of resistance α for MNM thin films were obtained. The Mg concentration dependence of structural and electrical properties for MNM films was investigated..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 4, 415 (2017)
AInP cap layer doping density in InGaAs/InP single-photon avalanche diode
LI Bin, CHEN Wei, HUANG Xiao-Feng, CHI Dian-Xin, YAO Ke-Ming, WANG Xi, CHAI Song-Gang, and GAO Xin-Jiang
The influence of the InP cap layer doping density of InGaAs/InP SPAD was studied through theoretical calculation and comparative experiment. Theoretical results show that low cap layer doping density is beneficial to suppress premature edge breakdown, reduce tunneling carrier generation rate, and increase breakdown proThe influence of the InP cap layer doping density of InGaAs/InP SPAD was studied through theoretical calculation and comparative experiment. Theoretical results show that low cap layer doping density is beneficial to suppress premature edge breakdown, reduce tunneling carrier generation rate, and increase breakdown probability. Experimental results show that devices with unintentionally doped cap layer have achieved 20% single photon detection efficiency and 1 kHz dark count rate at 223 K. Compared with devices with cap layer doping density of 5×1015/cm3, the single photon detection efficiency increases by 3%～8%, and the dark count rate decreases by about an order of magnitude. It is demonstrated that reducing the cap layer doping density is beneficial to improve the performance of InGaAs/InP SPAD..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 4, 420 (2017)
APolarization control and measurement technology using a biplate
LI Ya-Hong, FU Yue-Gang, HE Wen-Jun, and LIU Zhi-Ying
Based on the Stokes-Mueller matrix polarization algorithm, the polarization control mechanism of a biplate that consists of double quarter wave-plates or double half wave-plates was analyzed in detail. We have derived the analytical relations between the modulated polarization state and the fast-axis direction for the Based on the Stokes-Mueller matrix polarization algorithm, the polarization control mechanism of a biplate that consists of double quarter wave-plates or double half wave-plates was analyzed in detail. We have derived the analytical relations between the modulated polarization state and the fast-axis direction for the biplate. The movement trajectory of modulated polarization state on the Poincaré sphere was obtained. Which helps us to propose a polarization control measurement system using a biplate to complete the measurement of the Mueller matrix based on the projection matrix algorithm for the incident and exiting Stokes vectors. The polarization control accuracy for the exiting Stokes vector was also analysed. For a biplate that the error along the fast axis direction is±2 ° and the retardance error is λ/300, the maximum measurement error of Mueller matrix is 0.040 2. When the azimuth error caused by the error of the biplate is less than 0.16 rad, the elliptic angle error caused by the fast axis direction is not more than 0.032 rad, the ellipsometry error caused by the retardance is less than 0.015 rad, and it has no influence on the degree of polarization..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 4, 425 (2017)
A3-D reconstruction of textureless and high-reflective target by polarization and binocular stereo vision
PING Xi-Xi, LIU Yong, DONG Xin-Ming, ZHAO Yong-Qiang, and ZHANG-Yan
For high reflective targets with smooth surface, single or even none texture, a large area of data void may appear on the reconstruction surface since the traditional three-dimensional reconstruction method depending on texture and reflective characteristic. While three-dimensional reconstruction method based on polariFor high reflective targets with smooth surface, single or even none texture, a large area of data void may appear on the reconstruction surface since the traditional three-dimensional reconstruction method depending on texture and reflective characteristic. While three-dimensional reconstruction method based on polarization vision does not rely on the texture information on the surface of objects, the polarization imaging can restrain highlight to a certain extent, which can effectively solve the problems existing in the traditional three-dimensional reconstruction method. However, the depth information obtained by three-dimensional reconstruction method based on polarization vision is under pixel coordinates. Therefore, polarization and binocular three-dimensional reconstruction method was put forward. Taking absolute three-dimensional coordinate of a few feature points obtained by binocular stereo vision as the “bridge”, combined with the camera parameters obtained by binocular calibration, the point cloud data acquired by polarization in image pixel coordinates can be transformed into absolute data in world coordinates..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 4, 432 (2017)
AApplication of matching between two kinds of non-coaxial remote sensing equipment in coastline area
WANG Jun-Feng, DENG Hong-Ping, YI Wei-Ning, CHEN Zhen-Ting, DU Li-Li, and HUANG Hong-Lian
Taking the hyperspectral resolution of Spatial Heterodyne Spectrometer (SHS) as an example, and extracting from the characteristics of the ground surface interferometric data with SHS, this paper proposed a method to match and correct the pointing error of SHS. It used the feature of large area uniform landform and abrTaking the hyperspectral resolution of Spatial Heterodyne Spectrometer (SHS) as an example, and extracting from the characteristics of the ground surface interferometric data with SHS, this paper proposed a method to match and correct the pointing error of SHS. It used the feature of large area uniform landform and abrupt change of the surface reflectance in coastline area of the high spatial resolution remote sensing image. This method realized the matching application between non-coaxial imaging remote sensing equipment and non-imaging remote sensing equipment. The SHS was used to perform ground-based testing experiment on the results of interferometric data at several earth observation points and high spatial resolution image data in the same latitude and longitude region. The results of the calibration correction were compared with their nominal values. The error ranges from -3 % to 5%. The results show that the proposed method can be used as a reference for matching application between non-coaxial imaging remote sensing equipment and non-imaging remote sensing equipment on board the satellite..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 4, 439 (2017)
ADevelopment of 330 GHz receiver front-end with GaAs Schottky diodes
YAO Chang-Fei, CHEN Zhen-Hua, and GE Jun-Xiang
A 310~330 GHz receiver front-end with Schottky diode was designed and tested. The receiver first stage is a subharmonic mixer (SHM). In order to lower conversion loss (CL) and improve receiver sensitivity, the diode parasitic parameters such as the air-bridges inductance and their mutual inductance were discussed. The A 310~330 GHz receiver front-end with Schottky diode was designed and tested. The receiver first stage is a subharmonic mixer (SHM). In order to lower conversion loss (CL) and improve receiver sensitivity, the diode parasitic parameters such as the air-bridges inductance and their mutual inductance were discussed. The diode RF, LO and IF port impedance were calculated with embedding analysis for circuit optimization. The simulated CL accuracy was improved. The LO sources was realized by a ×6×2 multiplying chain, in which the sextupler is a commercial active multiplying chip. The balanced doubler was realized by a anti-series Schottky diode mounted on a suspended line. The chain can generate 10 dBm output power at 165 GHz to pump the receiver SHM. The receiver second stage is a low noise IF amplifier for lowering system noise figure. In the frequency range of 310~330 GHz, the measured receiver noise figure is lower than 10.5 dB with a minimum value of 8.5 dB at 325 GHz. The receiver gain is (31±1) dB..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 4, 446 (2017)
AA skylight polarization model of various weather conditions
ZHANG Ying, ZHANG Yi, and ZHAO Hui-Jie
The skylight polarization models can simulate the polarization state distribution of the skylight, and are key tools to study the quantitative relationship between the polarization state distribution of the skylight and the characteristic parameters of the atmosphere. A skylight polarization model of various weather coThe skylight polarization models can simulate the polarization state distribution of the skylight, and are key tools to study the quantitative relationship between the polarization state distribution of the skylight and the characteristic parameters of the atmosphere. A skylight polarization model of various weather conditions was modelled, which is based on adding and doubling method for solving the radiative transfer equation and T matrix method for calculating the scattering properties of particles. The comparison between the simulation results of this model and the calculation results of Hovenier et.al showed that the relative error of more than 95% points is less than 5%. The measurement experiment results with the polarization imaging system based on LCVR showed that measurements are most consistent with the simulation results in degree of polarization in 80% of the area. It can be concluded that the model can accurately simulate the distribution of the polarization state of the sky light under various weather conditions..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 4, 453 (2017)
AThe optical properties of the spinel LiTi2O4 thin film
ZHAO Ming-Lin, LIU Yu-Xiang, LIAN Jie, SHI Yu-Jun, SONG Hao-Nan, JIA Yan-Li, JIN Kui, and YANG Xiu-Lun
Transition-metal oxides LiTi2O4 thin film was epitaxially grown on MgAl2O4 (001) substrate by pulsed-laser deposition. The X-ray diffraction indicates that the film was successfully grown with high quality and single cubic spinel phase. The Raman-active phonons were studied by Raman spectroscopy. Using spectroscopic elTransition-metal oxides LiTi2O4 thin film was epitaxially grown on MgAl2O4 (001) substrate by pulsed-laser deposition. The X-ray diffraction indicates that the film was successfully grown with high quality and single cubic spinel phase. The Raman-active phonons were studied by Raman spectroscopy. Using spectroscopic ellipsometry, we also determined the refractive index and extinction coefficient of the film in visible-near-infrared region. Band structure and density of states (DOS) of LiTi2O4 were carried out by first-principles calculations. The theoretical calculations are consistent with the experimental results, and the optical constants is well identified by the theoretical band structure..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 4, 460 (2017)
AAn infrared image projector covering 8~12 μm radiation range
WANG Hong-Jie, QIAN Li-Xun, LI Zhuo, WANG Xin, and LIN Xu-Ling
This paper presents a visual to infrared transducer based on an infrared image converter chip fabricated by micro electro mechanical systems (MEMS). The infrared image projector consists of three parts, which are visible light image generation system, infrared image converter and the infrared image projection system. TThis paper presents a visual to infrared transducer based on an infrared image converter chip fabricated by micro electro mechanical systems (MEMS). The infrared image projector consists of three parts, which are visible light image generation system, infrared image converter and the infrared image projection system. This infrared image transducer covers the radiation band of 8-12 μm.Its resolution is 20 lp/mm and the apparent temperature range is 20 ℃ to 150 ℃. Non-uniformity of the image generated by infrared image projection device is less than 5% and its geometric distortion is less than 3%..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 4, 466 (2017)
AA novel target spectrum learning algorithm for small target detection in hyperspectral imagery
NIU Yu-Bin, and WANG Bin
A novel target spectrum learning method for small target detection in hyperspectral imagery is proposed to obtain a more accurate target spectrum for better supervised target detection. This method is composed of two components: adaptive weighted learning method and self-completed background dictionary. Given a completA novel target spectrum learning method for small target detection in hyperspectral imagery is proposed to obtain a more accurate target spectrum for better supervised target detection. This method is composed of two components: adaptive weighted learning method and self-completed background dictionary. Given a complete background dictionary, the former component refines the target spectrum through sparse coding and gradient descent algorithm. The latter component guarantees the background dictionary completeness by gradually size enlarging. Both experimental results on simulated and real hyperspectral data show that the proposed method has an advantage in extracting the accurate target spectrum, which enables better detection results..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 4, 471 (2017)
AData simulations and surface clutter suppression methods for the geostationary millimeter wave weather radar
TANG Shun-Xian, LV Da-Ren, HE Jian-Xin, LI Rui, LI Xue-Hua, and WANG Hao
Brief introduction of the geostationary Doppler weather radar (GDWR) was described. Secondly, based on the Satellite-Earth geometry model, observational data of GDWR were simulated using the APR-2 data, and the rainfall intensity and velocity field data were analyzed. By combining the characteristics of power spectrum Brief introduction of the geostationary Doppler weather radar (GDWR) was described. Secondly, based on the Satellite-Earth geometry model, observational data of GDWR were simulated using the APR-2 data, and the rainfall intensity and velocity field data were analyzed. By combining the characteristics of power spectrum data and time domain signals, the surface clutter was restrained using the Gaussian model adaptive processing method (GMAP) and fifth-order elliptic infinite impulse response ground clutter filter (IIR). The comparisons were carried out between the filtered data and the original data, which indicates that the weather radar echo influenced by the ocean surface clutter can be correctly recovered using IIR and GMAP methods..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 4, 481 (2017)
AOmega-k algorithm based on MLBF for millimeter wave bistatic forward-looking SAR imaging
MA Chao, ZHANG Xiao-Hu, YANG Jian-Chao, GU Hong, and SU Wei-Min
This paper combines millimeter-wave and bastatic forward-looking synthetic aperture radar (BFSAR) techniques, carrying out the research of imaging algorithms for millimeter-wave BFSAR. However, imaging algorithms for BFSAR are the difficulties in this study. Due to the special forward-looking geometry, imaging algorithThis paper combines millimeter-wave and bastatic forward-looking synthetic aperture radar (BFSAR) techniques, carrying out the research of imaging algorithms for millimeter-wave BFSAR. However, imaging algorithms for BFSAR are the difficulties in this study. Due to the special forward-looking geometry, imaging algorithms for bistatic SAR can not be applied to BFSAR directly. So, this paper proposes a modified Loffeld's Bistatic Formula (MLBF). The new method compared with other extended Loffeld's Bistatic Formula (ELBF) can obtain a bistatic point target reference spectrum, which is accurate enough for bistatic forward-looking configuration. Then, an Omega-k algorithm based on the reference spectrum is derived. Finally, simulations validate the accuracy of the MLBF method and the effectiveness of the Omega-k imaging algorithm..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 4, 490 (2017)
AExperimental study for coding computational imaging and quality evaluation of reconstructed image
MA Yan-Peng, QI Hong-Xing, Han Gui-Cheng, WANG Yi-Kun, Wang Lei, and SHU Rong
Infrared focal plane array detector suffers from problems including the lack of localization technology of infrared devices, intrinsic non-uniformity, and low signal-to-noise ratio (SNR). The costs for image acquisition, transmission, and storage became higher and higher for the applications of aerospace imaging. To ovInfrared focal plane array detector suffers from problems including the lack of localization technology of infrared devices, intrinsic non-uniformity, and low signal-to-noise ratio (SNR). The costs for image acquisition, transmission, and storage became higher and higher for the applications of aerospace imaging. To overcome these difficulties, this paper analyzed the principle of computational imaging system, and the compressive sensing theory was introduced for imaging. Then the imaging prototype was built, and compressed and uncompressed imaging had been investigated. Finally, the method of the signal subspace analysis was introduced for quality evaluation of the reconstructed image, and the SNR of the reconstructed image was estimated using this method. Experimental results demonstrate that the SNR estimation method is accurate and effective, which can give a reasonable number of samples required for the actual compressed imaging..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 4, 498 (2017)
AA privacy protection algorithm for active millimeter-wave imaging
YE Jin-Jing, ZHOU Jian, SUN Qian-Chen, YANG Ming-Hui, ZHU Yu-Kun, and SUN Xiao-Wei
A kind of human body image privacy protection algorithm was proposed for active millimeter-wave imaging security systems with the images was not affected by the height and the standing posture of people. The background noise of the millimeter-wave image was decreased and the edge details were increased by pretreatment A kind of human body image privacy protection algorithm was proposed for active millimeter-wave imaging security systems with the images was not affected by the height and the standing posture of people. The background noise of the millimeter-wave image was decreased and the edge details were increased by pretreatment of the human body image. The morphological processing and binarization were used to distinguish human body image from background. The pixel traversal method and human body proportion determination method were initially used to locate the private parts of human body with standard posture. Subsequently, the calibration algorithm was used to locate the privacy parts of human body with different height and non-standard posture to improve the identity rate of location. Finally, the already positioned privacy parts were blurred to protect the privacy of people under inspection. The algorithm has been applied to the actual imaging products. Compared with the conventional ones, the proposed algorithm has high portability, fast running speed and high positioning accuracy..
Journal of Infrared and Millimeter Waves
- Publication Date: Jan. 01, 1900
- Vol. 36, Issue 4, 505 (2017)
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