最新刊期
      期 5 ， 2010

        Invited Paper

      • ZHENG Wen-jun
        Vol. 25, Issue 5, Pages: 611-616(2010)
        摘要：Orientated acrylate-based polymer networks are produced in holographic field. The mesogenic groups of the diacrylate monomers in the isotropic phase are aligned locally by the holographic field and the polymerization of the monomers is then carried out in situ to lock up the orientational order. The holographic irradiation, created by means of two-beam-interfero -metry, acts double as the driving force to align mesogenic groups and the optical source for initiating the crosslinking of acrylate end groups.

          
        关键词：diacrylate mesogen;polymer liquid crystals;two-beam interference;orientational order of liquid crystals   
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        Material Physics & Chemistry

      • HE Chang-hai,ZHANG Chao-can
        Vol. 25, Issue 5, Pages: 617-621(2010)
        摘要：Azobenzene and its derivatives are widely used mesogenic groups. In this paper, 1-bromo-ω-(4-methoxyazobenzene-4'-oxy)alkanes(ZOn) have been synthesized in which the number of methylene unit varies from 2 to 6. The structures of the synthesized compounds were confirmed by IR and 1H NMR spectroscopy. The differential scanning calorimetry (DSC) measurement and polarizing optical macroscope (POM) observation showed that the resulting compounds exhibited thermotropic liquid crystalline mesomophism except for ZO2. ZO3 displayed semectic phase, and ZO4, ZO5 and ZO6 showed nematic phase. The texts pattern became more perfect with the increase of methylene number.

          
        关键词：azobenzene;bromoalkanes;mesogenic behaviour   
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      • PENG Zeng-hui,LIU Yong-gang,CAO Zhao-liang,MU Quan-quan,LU Xing-hai,HU Li-fa,WEI Zho
        Vol. 25, Issue 5, Pages: 622-625(2010)
        摘要：Two kinds of isothiocyanate (NCS) fluorinated LC materials with two benzene rings were prepared. The melting point and Δn of the NCS LC materials decreased along with the increase of fluorin number, the Δn of the LC with two fluorin atoms is only 0.20. The NCS LC material with one fluorin could enhance the response performance by response time test when the commercial LC was mixed with this material. These data indicated that the NCS LC synthesized have high birefringence, low melting point and fast response properties, and would have some application potential in liquid crystal modulator of adaptive optics.

          
        关键词：liquid crystals;fluorin;synthesize;property   
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      • HUANG Pei,HU Lan-ping,SHEN Dong
        Vol. 25, Issue 5, Pages: 626-634(2010)
        摘要：Three series of bent-core liquid crystals, the derivatives of 2,5-bis-(p-hydroxyphenyl) -1,3,4-oxadiazole(ODBP) were synthesized, their transition temperatures were studied by DSC (Differential Scanning Calorimetry) and POM (Polarizing Optical Microscope). It was found that symmetric oxadiazoline ether derivatives with three benzene rings dont exhibit LC phase; symmetric oxadiazoline ester derivatives with five rings (benzene or trans-cyclohexane) show biaxial nematic(Nb) phase with large temperature range (29~54 ℃), but the clearing temperatures were over 200 ℃. Asymmetric oxadiazoline ester derivatives with F or CN as a terminal group show rather high clearing temperatures (>270 ℃), but without Nb phase.

          
        关键词：oxadiazole;biaxial nematic phase;symmetric oxadiazole ether;symmetric oxadiazoline ester;asymmetric oxadiazoline ester   
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      • Vol. 25, Issue 5, Pages: 635-639(2010)
        摘要：The stability of Saturn-ring and dipole defects in nematic liquid crystals is studied. Two structures are possible around microspheres suspended in nematic liquid crystals: a Saturn- ring and a dipole, which are investigated by calculating their Frank free energy. As a result, if k24＜k(1-(1/2)ln(R1/rc)), the Saturn-ring is the preferred configuration which does not depend on the particle size, where R1 is the length of liquid crystal molecule, k and k24 are the elastic constants, and rc is the radius of the disclination line core. If k24＞k(1-(1/2)ln(R1/rc)), for small particles the Saturn-ring defect is more stable, and contrarily for large particles the dipole defect is more stable. The results demonstrate that a transition from the Saturn-ring defect to the dipole defect is induced either by increasing the particle size, the saddle-splay elastic constant k24 or by decreasing k.

          
        关键词：director field;Saturn-ring defect;free energy   
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      • LUO Fei,LI Jian-feng,LIU Cang-li,ZHANG Da-yong
        Vol. 25, Issue 5, Pages: 640-645(2010)
        摘要：A flat interface between liquid crystals and isotropic is often unstable when driven away from its equilibrium state. Some transient patterns will be observed at the early stage of the progress. Sinusoidal patterns are observed and measured with polarized microscope in smectic-A liquid crystals growing from uniform isotropic. A phenomenological model of pattern selection is built in the principle of action which produced by integrating over the energy functional. The global minimum wave number can be found by numerical calculation and reflect the characteristics of the actual selected interface pattern.

          
        关键词：smectic-A liquid crystals;pattern selection;interfacial instability   
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      • LI Xiao-lian,ZHANG Zong-ying,WANG Yi
        Vol. 25, Issue 5, Pages: 646-648(2010)
        摘要：In present work, 1,5-dihydroxy-4,8-diamino-2-(p-alkoxyphenyl) anthraquinones have been synthesized through the methods of substitution, addition indexing, reduction, sulfonation, taking off sulphur, to change partial groups and bases in α position and β position, using 1,5-dihydroxy-4,8-dinitroanthraquinone as the raw material.UV maximum is up to 580 nm, and the order parameter is 0.71, both of which can satisfy the need on properties of dichroic dyes used for guest-host liquid crystal display.

          
        关键词：anthraquinone;guest-host effect;order parameter;dichroic dye   
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      • FENG Yu-guang,TENG Feng,HUANG Shi-hua
        Vol. 25, Issue 5, Pages: 649-655(2010)
        摘要：On the basis of property of 4-vinylpyridine, a spherical microsphere of poly (DVB-co- St-co- 4-VP) was prepared in methanol and by precipitation polymerization. After characterizations, no glass transition temperature was observed by DSC. Thermal stabilization of poly (DVB-co-St-co- 4-VP) was changed with varying ratios of comonomers, and pyridyl on the surface of the spherical microsphere was detected by TG. The structure unit of poly (DVB-co-St-co-4-VP) was confirmed by FT-IR, and two absorption bands of 770~875 cm-1 and 1 450~1 725 cm-1 were assigned to divinylbenzene and styrene, and absorption peak at 1 600 cm-1 was belonged to pyridyl. As a result, after analyzing appearances and diameters, the synthesizing mechanism different from existing theories was obtained and it was confirmed that appearance of product was dominated by hydrogen bond between pyridyl and hydroxyl.

          
        关键词：radical precipitation polymerization;hydrogen bond;4-vinylpyridine;electrophoresis   
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        Device Technology & Physics

      • JING Ya-ni,HU Wen-hua,ZHANG Ping,WEI Zhi-fen,TANG Zheng-ning,ZHONG Chuan-jie
        Vol. 25, Issue 5, Pages: 656-660(2010)
        摘要：Conducting polymer PEDOT/PSS films were deposited utilizing piezoelectric ink-jet printing technology. The effect of annealing temperature, ethylene glycol doped on conductive properties of the films was studied. The results show that the average surface roughness of films when no annealing and annealing at 120, 140, 160 ℃ were 8.15, 4.10, 3.36, 2.66 nm, respectively; ethylene glycol doped reduces the conductive activation energy of the film from 0.096 eV(no-doping) to 0.046 eV. The decrease of the conductivity activation energy suggests that the PEDOT chain turns from the coil conformation of low conductivity into the expanded-coil conformation of high conductivity. In addition, the doping of ethylene glycol reduces the surface roughness of the films due to PSS separated from PEDOT/PSS and then the PEDOT/PSS particles become smaller and more evenly dispersed.

          
        关键词：PEDOT/PSS;inkjet printing;conducting polymer film;conductive properties   
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      • ZHAO Xiang-jie,LUO Yong-quan,WANG Hai-feng,LUO Fei,LIU Hai-tao,ZHANG Da-yong
        Vol. 25, Issue 5, Pages: 661-665(2010)
        摘要：High power laser induced nonlinear optical effects in liquid crystal are prone to deteriorate the optical properties of liquid crystal device. The self diffraction phenomenon was observed when high power Gaussian profile laser beam propagate in 5CB liquid crystal, which was taken by high speed camera. The dynamical evolution of the diffraction phenomenon was studied to analyze the nonlinear optical properties of the liquid crystal. Kirchhoffs diffraction integral was applied to study the diffraction rings induced by Gaussian profile laser beam propagating in self-defocusing medium numerically. The comparison of experimental result with theoretical result elucidates the nonlinear effect of liquid crystal.

          
        关键词：nonlinear optics;nematic liquid crystal;diffraction rings;Kirchhoffs diffraction integral;optical-induced refractive index change   
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      • JIANG Qian,ZHANG Fang-hui
        Vol. 25, Issue 5, Pages: 666-671(2010)
        摘要：A red organic light emitting device with host 9, 10-di-(2-naphthyl)anthracene(ADN) and red dopant 4-(dicyanomethylene)-2-t-butyl-6(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran (DCJTB) and assist blue dopant 2,5,8,11-tetra-tertbutylperylene(TBPe) was fabricated, and 4,4',4″-tris triphenylamine (2TNATA), 4,4＇-bis biphenyl (NPB),tris-(8-hydroxyquinoline) aluminum (Alq3) were used as hole injection, hole transportation, electron transportation materials, respectively. The results show that ADN doped with DCJTB can realize red emission as well, and the use of TBPe as assist dopant effectively enhance the device luminous efficiency, yet almost have no effects on CIE coordinates. Additionally, devices with 2% TBPe(mass fraction) appear optimum luminous efficiency and highest temperature increase rate.

          
        关键词：red OLEDs;TBPe;DCJTB;efficiency;temperature   
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      • LIU Ding-han,ZHANG Fang-hui,MU Qiang
        Vol. 25, Issue 5, Pages: 672-677(2010)
        摘要：A highly efficient white organic light-emitting device could be achieved by changing doping concentration in the emissive layer of the device containing 9,10-di-(2-naph-thyl)anthracene(ADN), 2,5,8,11-tetra-butyl-perylene(TBPe) and 4-(Dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethylj-ulolidy1-9-enyl)-4H-pyran(DCJTB).By examining the device chara-cteristics of uniformly doped devices with varying dopant concentration, it is found that the device with the doping concentration(mass fraction) of 1% DCJTB gains the maximum current(ηL) and power(ηP) efficiencies, which are 6.6 cd/A and 3.21 lm/W at luminance of 10 520 cd/m2 with CIE coordinates of (0.318 6, 0.352 0). The different color of devices can be obtained by changing doping concentration of DCJTB.

          
        关键词：OLED;DCJTB;dopant;luminance   
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      • YAN Hong-gang,ZHANG Fang-hui,LU Jun-fu,JIANG Qian,LIU Ding-han
        Vol. 25, Issue 5, Pages: 678-683(2010)
        摘要：This paper systematically investigated the effect of the thickness of 2-TNATA on the characteristics of stacked white organic light-emitting devices consisting of separate blue and yellow elements. The device structure was 2-TNATA(x nm)/NPB(25 nm)/AND(30 nm) ∶ TBPE(2%) ∶ DCJTB (1%)/Alq3(20 nm)/LiF(1 nm)/Al(100 nm). According to the experimentation result, it was found the effects of thickness of 2-TNATA on carrier injection, color and thermal stability was very significant. The color of the white device can be adjusted by changing the thickness of 2-TNATA inserted. The device using 20 nm 2-TNATA as a hole injection layer showed pure-white light emitting with 1931 CIE chromaticity coordinates x=0.319 7, y=0.349 6, and the luminance of 12 230 cd/m2.

          
          
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      • HUANG Tao,JIANG Wen-long,DING Gui-ying,WANG Jin,GAO Yong-hui
        Vol. 25, Issue 5, Pages: 684-688(2010)
        摘要：The electroluminescence (EL) characteristics of a novel yellow emitting material (BTHQZn) were investigated in this paper. The results demonstrated the BTHQZn with strong emitting and hole-transporting ability.Based on the performances, a series of un-doping and doping yellow organic light-emitting diodes (OLEDs) were fabricated. The yellow device was fabricated as follows: ITO/2T-NATA(30 nm)/CBP ∶ 5%Ir(ppy)3 ∶ 10%BTHQZn (20 nm)/Alq3(50 nm)/LiF(0.5 nm)/Al, the maximum luminance was 4 552 cd/m2 at an applied voltage of 12 V,while the Commission International de LEclairage coordinates was (0.395 4, 0.497 6), and the maximum luminous efficiency was 2.82 cd/A at applied voltage of 11 V.

          
        关键词：organic light-emitting devices;BTHQZn;hole-transporting emitter material   
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      • SONG Jing,LI Hong-liang,LIU Yong-gang,XUAN Li
        Vol. 25, Issue 5, Pages: 689-692(2010)
        摘要：Azobenzene polymer and liquid crystal are mixed in certain ratio, then the mixture is injected into cells. Nonlinearly photoinduced birefringence takes place when linearly pola-rized ultraviolet is applied with the pattern photomask covering on the cells, which results in the formation of azobenzene polymer doped liquid crystal grating. The samples are checked by optical microscope and He-Ne laser. The results indicate the samples have clear grating structure, and the diffraction efficiencies can be modulated by electric field. It is important that the driving voltage of the sample is low enough to match the driving integrated circuit.

          
        关键词：liquid crystal;azobenzene polymer;grating;electric-optical property   
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      • ZHANG Zhuo,ZHAO Hai-yu,ZHANG Pei-lin,YOU Jae-geon
        Vol. 25, Issue 5, Pages: 693-695(2010)
        摘要：Touch shift caused the Touch Mura of LCD panels. But the maximum shift distance was difficult to measure because the glasses would recover quickly. This paper reports one method to simulate the touch shift process of touch with weight-pressing method. It was found that the maximum shift distance raised with the increase of LC amount and the recovering ability was also developed greatly at the same time.

          
        关键词：weight-pressing method;touch Mura;simulation   
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      • MU Qiang,YAN Hong-gang,ZHANG Fang-hui
        Vol. 25, Issue 5, Pages: 696-698(2010)
        摘要：Two types of liquid crystal display(LCD) were designed utilizing LCD Master software, and response time,contrast ratio and view angle of LCD were simulated under different pretilt angle(from 3.6°to 4.4°).By simulating,it was found that response time of LCD would get longer,contrast ratio would get larger as increasing the pretilt angles,but view angle of LCD wound not be changed.

          
        关键词：pretilt angle;simulation;LCD Master;TN-LCD   
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      • LIU Bo,ZHANG Xiao-bing
        Vol. 25, Issue 5, Pages: 699-701(2010)
        摘要：A kind of backlight unit is designed in this paper, in which the white LEDs are used as the main light source,and the orange LEDs and blue LEDs are used as the color-complementation light source. The proportion of high levels of three PWM control pulses is gained on the condition of different lightness by the method of linear matching, and then the three PWM pulses can be adjusted according to the proportion. By this way,the standard white light source can be obtained, of which the color temperature u' is in 6 500±100 K, the color coordinate u' is in 0.198±0.01, and v' is in 0.468±0.01. The high level time of three PWM pulses can be adjusted appropriately according to the color data of TCS230 when the temperature is changed. The color will keep steady on the condition of the pulses number of the three color channels keeping their proportion fixed.

          
        关键词：LED backlight;mending color;adjusting lightness of PWM   
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      • WANG Feng,GAO Ya-fei,ZHOU Gang,WANG De-jiang
        Vol. 25, Issue 5, Pages: 702-705(2010)
        摘要：The design of a testing system of aerial camera circuit board is introduced. The tested signals on every circuit board come from a special connector. The different tested interface is connected to testing equipment through different cable. The signal is selected from the interface by testing equipment and acquired by virtual instrument. We can know whether the signal works well through comparing the acquiring wave with the pre-storage wave. This method improves the testing camera efficiency.

          
        关键词：aerial camera;virtual instrument;testing port   
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      • ZHAO Cun-lei,YANG Xiao-tian,WANG Chao,TANG Wei,YANG Jia,GAO Xiao-hong
        Vol. 25, Issue 5, Pages: 706-708(2010)
        摘要：ZnO thin films were grown on Si substrates by metal-organic chemical vapor deposition under different oxygen partial pressures, and the properties of the films were studied. It was found sharp diffraction peaks for ZnO (002) by X-ray diffraction, indicating the films were highly c-axis-oriented. The photoluminescence spectra of the ZnO films were studied. The surface morphology was studied by the atomic force microscopy. It was found that the ZnO films grew in a column-by-column process. The average grain size and the root-mean-square values for the film-surface morphology were decreasing with the increasing oxygen partial pressure.

          
        关键词：ZnO;thin films;MOCVD   
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      • LI Yu-kui,LIU Yun-peng
        Vol. 25, Issue 5, Pages: 709-712(2010)
        摘要：With the low-melting glass frit sealing process, the triode field emission display device was developed; the cathode faceplate, anode faceplate and packaging faceplate were respectively formed using the soda-lime glass materials. Used as the common part of connected emitting chamber and exhaust chamber, the anode faceplate was adopted to display the device image. The deformation phenomenon was avoided for the anode faceplate with high smoothness in the vacuum environment, and the lightening image possessed good display uniformity. There was no any electrode for the packaging faceplate. The whole packaging device fabrication process was stable, reliable and low-cost. The developed display device possessed high display brightness, better grid-controlled characteristics and image display performance.

          
        关键词：faceplate;packaging;display;device;field emission   
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        Driving & Controlling

      • GENG Wei-dong,LIU Hui-gang,LIU Yan-yan,SHANG Guang-hui,JING Qing,HU Si-jie,QUAN Zhi-
        Vol. 25, Issue 5, Pages: 713-717(2010)
        摘要：The circuit design of a multi-mode intelligent gamma correction for LCoS is introduced. It is based on the digital control method and can be integrated to the field sequential color LCoS chip. Under the control of the external CPU it has in-system programming feature and can be programmed independently to setup gamma correction curve of RGB sub-field. The circuit has adopted the 10 bit dual resistor ladder D/A converter and has advantages of high voltage accuracy, simple circuit structure and low power consumption. The internal structure of the circuit, software flow and experimental results are described. Test results show that the maximum error of the output voltage is only 3 mV when the output voltage range is 0 to 5 V.

          
        关键词：field sequential color;gamma correction;LCoS chip;reference voltage source   
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      • MA Shun-feng,JIN Long-xu,AN Shao-ting,PIAO Yong-jie,ZHANG Ke,TAO Hong-jiang
        Vol. 25, Issue 5, Pages: 718-723(2010)
        摘要：This paper presents the design and implementation of a chromatic TFT-LCD module based on ARM9 processor. To resolve the real-time display, the image and character library is stored in the NAND Flash memory, and the memory capacity is 64 Mbytes. Depending on different requirements, the image and character library can be updated. The 24 bit color image of raw pixel can be displayed on the LCD directly. The image decoding for the JPEG format is presented, so the image of JPEG format can also be displayed. The module communicates with control system using the serial port. Receiving different kind of instructions, image and character in the flash memory can be displayed respectively. The module was tested on the TFT-LCD LQ080V3DG01, and the result shows that the module works reliably. The module has been applied to the image display system.

          
        关键词：ARM;TFT-LCD;flash memory;JPEG decoder   
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      • ZHANG Chuan-sheng
        Vol. 25, Issue 5, Pages: 724-727(2010)
        摘要：To replace ASIC, Nios Ⅱ was constructed in FPGA. With the C program in NiosⅡ,the designed parameters for different specifications can be calculated automatically according to inputted system parameters. It can be used in different LCOS electronics.With USB chip and special program flow diagram, LCOS controller are lower cost, more stable and reliable.

          
        关键词：LCOS;FPGA;controller   
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      • YU Tao,CAO Xiao-tao
        Vol. 25, Issue 5, Pages: 728-732(2010)
        摘要：In order to find the best focal plane position of space camera, to help to analyze the effect on camera image quality on drift angle real-time adjusting, to assist the sophisticated experiment of focus and drift machine, a multi-function focus-drift control and liquid crystal display system was proposed. First, the system requirements were analyzed; and then the system composition and work principle were introduced; finally, design of system and experi- mental verifying were carried out. The results show that the system can control the focus motor with frequency 33 Hz or 1 kHz, focus machines adjustable range is -2~2 mm, closed-loop control error is less than 1.2 μm, which can control the drift motor with frequency 33 Hz or 666 Hz; drift machines adjustable range is -3°~3°,closed-loop control error is not more than 0.012°,which can set motor direction, frequency, target location and liquid crystal display system status and parameters. It can fully satisfy the test requirements on focus and drift control for space camera on the ground.

          
        关键词：focus;drift;space camera;liquid crystal display   
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      • LI Peng-fei,XU Jin-kai,HU Li-fa,CHENG Shao-yuan,XUAN Li
        Vol. 25, Issue 5, Pages: 733-737(2010)
        摘要：A focus auto adjusting system for the LCOS retinal aberration correction setup was built to locate the best position of CCD imaging plane. It resolved the problem that CCD was usually not in the best imaging plane. The system adopted Step-Calculation-Comparison method. Through comparing the correlation and blurring level of two neighbor images, it can find the best imaging position within short time. Using the system, doctors can obtain more valuable retinal images through adaptive optics system than traditional fundus system. In addition, it can also realize several small view angle retinal images stitching, and monitor large view angle retinal area in real time.

          
        关键词：aberration correction;focus auto adjusting;retinal   
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      • SHI Ming-jing,ZHANG He,HE Dao-qing
        Vol. 25, Issue 5, Pages: 738-742(2010)
        摘要：Based on the knowledge about how to use LTBHB203E1K LCD module and EP1K30QC208-3 FPGA, a display part of handheld digital storage oscilloscope was completed to reduce system cost and power consumption by modular design. The method of driving liquid crystal module is given and data storage and data processing modules are realized by FPGA. The design achieved such purposes as displaying input signal waveform, user settings, input signal parameters and so on. This technique has highly practical value and has been applied to the products.

          
        关键词：storage oscilloscope;liquid crystal;drive;FPGA   
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      • GE Chao,ZHANG Jing-chun,SUN Yan-bin,SUN Li-ying,ZHU Yi
        Vol. 25, Issue 5, Pages: 743-746(2010)
        摘要：The traditional control system of LED lattice screen often uses 8 bit or l6 bit controller. It is difficult to meet the requirements of larger area display and stable refresh rate because of its slow operation, low addressing capacity and high power consumption. To resolve these problems above, this paper puts forward a way for large-scale LED lattice screen display system based on ARM embedded. The data can be transmitted and controlled by the inner DMA controller of the ARM chip. The fetch and translation time can be saved for the processor to transmit data continuously when reading and writing. The speed and efficiency of transmitting can be improved.

          
        关键词：ARM;LED;DMA;parallel bus   
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        Imaging Technology & Image Processing

      • LIU Xu-yue,HU Jun
        Vol. 25, Issue 5, Pages: 747-751(2010)
        摘要：To improve the efficiency of CCD imaging subsidiary system fault diagnosis, the fault tree analysis is adopted to analyse its fault mode,which provides an effective way to find faults in complex system. The importance of FTA is described,the quantitative analysis method of FTA is introduced in detail. Taking CCD imaging subsidiary system of space camera as the research object,on the basis of the forming of fault tree,the establishing of the mean event fault tree and the obtaining of the mean event fault probability,the element hiberarchy fault orientation on CCD imaging subsidiary system of space camera is realized.The analytic results show that using the fault tree guides designer to know clearly the relation and level of components faults in system intuitively, the maintaining efficiency and dependability of system can be improved.

          
        关键词：fault tree;fault tree analysis;fault diagnosis;CCD imaging subsidiary system   
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      • ZHAO Bian-hong,HE Bin,YANG Li-hong,WANG Wen-hua,LU Jin-bo
        Vol. 25, Issue 5, Pages: 752-758(2010)
        摘要：The existence of stripe noises influences the qualities of TDI-CCD images, and reduces the measurement accuracy of the system simultaneously. For the characteristic of slow change of the stripe noisesgrey level compared with the primary information, the stripe noises are eliminated via low-pass filter and band-elimination filter separately using the method of determining the stripe noise frequency through the frequency spectrum mapping in the Fourier transform domain. Moreover, an improved threshold of Wavelet Transform method of eliminating stripe noise is presented in this paper. The each vertical directions threshold in various scales is determined by itself after the wavelet decomposition. It is proved that in removing the TDI-CCD stripe noises, the improved threshold of Wavelet Transform is better than the traditional Fourier Transform. The stripe noises can be removed drastically via the improved threshold of Wavelet Transform method, the goal which reserves the spectral characteristic of original image is also achieved.

          
        关键词：TDI-CCD;stripe noises;Fourier transform;wavelet transform;adaptive threshold   
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      • LIU Yan-yan,LI Guo-ning,ZHANG Yu,LI Hong-zuo
        Vol. 25, Issue 5, Pages: 759-763(2010)
        摘要：Through analyzing response non-uniformity of visible light area CCD, a kind of system that is used to response non-uniformity detection had been presented, and it is applied to all kinds of area CCD. After radiation scale was done for area CCD485 with this system, the respond relation was established between the gray value of digital image and radiation luminance which integration sphere exported, and responsibility curve was also described. From the digital image that can be gathered, it can be find out the gray value have obvious jump, response non-uniformity has exceeded 5%. When taking pictures under weak light, it will be serious to affect the quality of pictures, so must be rectified. Correction algorithm is selected according to the responsibility curve of area CCD. Because of the area CCD485s responsibility is linear, so here have adopted two-point correction algorithm, calculate the correction factors (gain and offset) of all pixels, and put them into correction matrix. Through multiplication and addition operation, the signal of every pixel is rectified into the average signal of area CCD. Experiment result shows that two-point correction algorithm makes response non-uniformity of CCD485 arrive original 1/10, it is a practical effective method of correction.

          
        关键词：area CCD;responsibility;non-uniformity correction;two-point correction algorithm   
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