2013
2013
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Record 205 of
Title:Design of compact apochromatic lens with very-broad spectrum and high resolution
Author(s):Yan, Aqi(1); Cao, Jianzhong(1); Zhang, Jian(1); Zhang, Zhi(1); Wang, Hao(1); Wu, Dengshan(1); Zhou, Zuofeng(1); Zhang, Kaisheng(1); Lei, Yangjie(1)Source: Proceedings of SPIE - The International Society for Optical Engineering Volume: 8907 Issue: DOI: 10.1117/12.2030546 Published: 2013Abstract:This paper designs a compact apochromatic lens with long focal length, which operates over very-broad spectrum from 400nm to 900nm for high resolution image application. The focal length is 290mm, and F-number is 4.5.In order to match CCD sensor, lens resolution must be higher than 100lp/mm. It is a significant challenge to correct secondary spectrum over very-broad spectrum for this application. The paper firstly pays much attention on dispersion characteristic of optical materials over this very-broad spectrum, and dispersion characteristic of glasses is analyzed. After properly glasses combinations and optimal lens structure selected, this compact apochromatic lens is designed. The lens described in this paper comprises fewer lenses, most of them are ordinary optical materials, and only one special flint type TF3 with anomalous dispersion properties is used for secondary spectrum correction. Finally, the paper shows MTF and aberration curve for performance evaluation. It can be seen that MTF of the designed lens nearly reach diffraction limit at Nyquist frequency 100lp/mm, and residual secondary spectrum is greatly reduced to less than 0.03mm (in the lines 550nm and 787.5nm). The overall length of this compact apochromatic lens is just 0.76 times its focal length, and because of fewer lenses and ordinary optical materials widely used, production cost is also greatly reduced. ? 2013 Copyright SPIE.Accession Number: 20141317510077 -
Record 206 of
Title:Object tracking based on integrating the Genetic algorithm with complex method
Author(s):Dong, Xiaokun(1); Cao, Jianzhong(1); Yang, Hongtao(1); Yu, Zhi(1); Guo, Huinan(1); Liu, Chen(1)Source: Proceedings of the 2013 International Conference on Intelligent Control and Information Processing, ICICIP 2013 Volume: Issue: DOI: 10.1109/ICICIP.2013.6568068 Published: 2013Abstract:Traditional Genetic algorithm in target tracking process, is quite effective in the global scope to search target position. However, once the background color and light intensity change. To monitor the state of the target depth movement is often difficult to locate the target accurately. However, complex method can make up for the lack of Genetic algorithms. In view of those, this paper integrates Complex method with traditional Genetic algorithms, uses the center coordinates of the candidate target and scaling coefficient to adjust the focus size as a parameter encoding, and takes the similarity between the target area and the target template as a fitness function, then searches the object in the overall and local scope in turn. The experiments show that the fusion algorithm can achieve accurate tracking of the position and the size of the target. ? 2013 IEEE.Accession Number: 20133616702282 -
Record 207 of
Title:Infrared four spectral temperature radiometer electronics design and implemention
Author(s):Yi, Bo(1); Zhang, Jian(1); Qu, Enshi(1); Xie, Qingsheng(1); Leng, Hanbing(1); Liu, Wei(1); Wu, Dengshan(1); Lei, Yangjie(1); Wang, Zefeng(1)Source: Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering Volume: 42 Issue: 10 DOI: Published: 2013Abstract:A four-spectral infrared radiometer, which can automatically measure the temperature of sea surface, was designed to calibration and test the satellite on ground. The electronics system of the infrared radiometer was designed in detail using the spectral modulation, the wave length of 3.5-4 μm, 8-13 μm, 10.3-11.3 μm, 11.5-12.3 μm infrared band was used to acquire and process the data. The temperature of the sea surface was computed by double blackbody standard source real-time automatic correction system parameters and corresponding algorithm. The designed infrared system could also display the temperature and save the data synchronously on PC. In addition, the requirement of sampling precision of 0.1 K was guaranteed by the design of A/D sampling. Finally, by analying the data acquired in south China sea, the measure precision of the system was verified in ±0.5 K, which can satisfy the technical requirement.Accession Number: 20135217144551 -
Record 208 of
Title:An infrared imaging measuring method applied to check deviation of extended field view
Author(s):Chen, Weining(1); Yang, Hongtao(1); Fan, Zheyuan(1); Cao, Jianzhong(1); Liu, Guangsen(1); Zhang, Jian(1); Wu, Dengshan(1); Zhang, Zhi(1)Source: Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering Volume: 42 Issue: 3 DOI: Published: March 2013Abstract:The working principle of an extended infrared optical system was introduced in this paper. Because the imaging is usually affected by the deviation of view field due to the assembly error of wedge lens after initialization of system, a new infrared imaging optical measuring method was put forward in order to check the deviation of view field in optical system. The method integrated infrared imaging system and the computer vision technology that was applied in measuring the trajectory of motion target. The infrared imaging system was used to image the motion targets. Then the trajectories of motion target were regarded as the sequence of discrete points. The computer vision technology was used to detect the trajectories of the points and collect the image of discrete points in the continuous motion of those targets. Later, the deviation of view field of extended infrared optical system was revised by image processing of the original image of the trajectory of motion target and simulation of actual trajectory of motion target using programming. The results show that the infrared imaging measuring system which is based on computer vision technology can efficiently complete the measuring of the trajectory of motion target.Accession Number: 20132616448341 -
Record 209 of
Title:Design of the segmented primary optical telescope
Author(s):Zhang, Kaisheng(1); Yan, Aqi(1); Cao, Jianzhong(1); Fan, Zheyuan(1); Wu, Li(1); Zhang, Zhi(1); Zhu, Qing(1)Source: Proceedings of SPIE - The International Society for Optical Engineering Volume: 8907 Issue: DOI: 10.1117/12.2034071 Published: 2013Abstract:Following with the "high-resolution upsurge" appeared in many counties in recent few years, it is an inevitable trend to increase the size of the Optical Telescope. However, because of the volume constrains of space-borne astronomical instruments, segmented reflector is thought as the main measure of future astro-physical missions by many scientists. In this paper, a coaxial three-mirror anastigmatic system (TMA) with a segmented primary mirror is modeled in optical software. The optical system, which has 2.4m aperture, 48m focal length and the field-view angle of 0.3°x0.06°, works in the 450nm～900nm wave band. The '1+6' aperture-stiching model is applied. Firstly, the initial structure of the system is inputted to the CODEV, and a certain constraint functions are set, and then the system automatically optimizes. Finally, designing results show that the Modulation Transfer Function (MTF) is really very near to the limit of diffraction. We get a good image quality of the optical system design results. ? 2013 Copyright SPIE.Accession Number: 20141317510184 -
Record 210 of
Title:A new subpixel imaging method for image super resolution
Author(s):Wang, Jihong(1); Zhou, Zuofeng(1); Zhang, Jian(1); Cao, Jianzhong(1); Wu, Qingquan(1); Fan, Xinming(1); Gong, Zhendong(1); Zhao, Bing(1)Source: Proceedings - 2013 International Conference on Information Science and Cloud Computing, ISCC 2013 Volume: Issue: DOI: 10.1109/ISCC.2013.28 Published: December 2, 2014Abstract:The subpixel imaging technique for image super resolution can get a higher resolution image from two low resolution images which are observed from two linear array CCDs staggered half pixel both along the flight direction and perpendicular direction. In this paper, an adaptive weight interpolation method which considers the Euclidean distance information from two low resolution images for different size interpolation window is proposed. Compared with the traditional interpolation method, the experiment results show the effectiveness of the proposed method. ? 2013 IEEE.Accession Number: 20145200363545 -
Record 211 of
Title:Target optimization design of cam curve in zoom system
Author(s):Ning, Chenwei(1); Zhong, Caojian(1); Tao, Yanghong(1); Jian, Zhang(1); Yuan, Fanzhe(1); Li, Wu(1); Hui, Zhang(1); Jie, Leiyang(1)Source: Key Engineering Materials Volume: 552 Issue: DOI: 10.4028/www.scientific.net/KEM.552.44 Published: 2013Abstract:Zoom lens has been widely applied in all kinds of fields, and its cam optimization is the key to actualizing the performance of its optical design and the zooming process, while the smoothness and speediness of zooming movement must be considered for military and civilian use. With the incremental use of environmental requirements, it puts forward higher requests to the cam performance of lens. In order to guarantee that the cam has good stiffness in the case of vibration and shock environment, in the process of cam design, it not only requires curve optimal, but also needs to consider influence on the performance which is caused by reduced cam stiffness of the zoom system. A fine curve can ensure that the cam pressure angle α is smaller, and to ensure the cam follower maintains the uniform velocity and smaller acceleration in zooming process, and make the zoom system produce little impact, and whole zooming process smooth and fluent, it can reduce the zoom systems driving moment M, and can ensure the stability imaging of the zoom system. Good cam stiffness K can make the zoom lens have good stability in vibration environment, and make sure that the image quality. M and K respectively up to the pressure angle α of zoom curve and the rotation angle θ of zoom curve in cam. In the new cam design process, considering the whole influence on the performance that is caused by K and M to cam, we construct the function expressions K = f (α, θ) and M = f (α, θ), and then, build target optimization function with K and M, optimize the relationship between pressure angle α of zoom curve and rotation angle θ, looking for the optimal value for the stiffness K and the cam system driving moment M , and improve overall performance of the zoom cam . ? (2013) Trans Tech Publications, Switzerland.Accession Number: 20133016543311 -
Record 212 of
Title:Field-programmable gate array-based hardware architecture for high-speed camera with KAI-0340 CCD image sensor
Author(s):Wang, Hao(1); Yan, Su(1); Zhou, Zuofeng(1); Cao, Jianzhong(1); Yan, Aqi(1); Tang, Liniao(1); Lei, Yangjie(1)Source: Proceedings of SPIE - The International Society for Optical Engineering Volume: 8908 Issue: DOI: 10.1117/12.2033013 Published: 2013Abstract:We present a field-programmable gate array (FPGA)-based hardware architecture for high-speed camera which have fast auto-exposure control and colour filter array (CFA) demosaicing. The proposed hardware architecture includes the design of charge coupled devices (CCD) drive circuits, image processing circuits, and power supply circuits. CCD drive circuits transfer the TTL (Transistor-Transistor-Logic) level timing Sequences which is produced by image processing circuits to the timing Sequences under which CCD image sensor can output analog image signals. Image processing circuits convert the analog signals to digital signals which is processing subsequently, and the TTL timing, auto-exposure control, CFA demosaicing, and gamma correction is accomplished in this module. Power supply circuits provide the power for the whole system, which is very important for image quality. Power noises effect image quality directly, and we reduce power noises by hardware way, which is very effective. In this system, the CCD is KAI-0340 which is can output 210 full resolution frame-per-second, and our camera can work outstandingly in this mode. The speed of traditional auto-exposure control algorithms to reach a proper exposure level is so slow that it is necessary to develop a fast auto-exposure control method. We present a new auto-exposure algorithm which is fit high-speed camera. Color demosaicing is critical for digital cameras, because it converts a Bayer sensor mosaic output to a full color image, which determines the output image quality of the camera. Complexity algorithm can acquire high quality but cannot implement in hardware. An low-complexity demosaicing method is presented which can implement in hardware and satisfy the demand of quality. The experiment results are given in this paper in last. ? 2013 SPIE.Accession Number: 20134216857663 -
Record 213 of
Title:Column fixed pattern noise correction of the CMOS image sensor based on estimation method
Author(s):Wang, Hua(1); Cao, Jianzhong(1); Wang, Huawei(1); Guo, Huinan(1); Zhao, Xiaodong(1); Liu, Guangsen(1)Source: Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering Volume: 42 Issue: 7 DOI: Published: July 2013Abstract:The column fixed pattern noise (CFPN) of the CMOS image sensors have severe influence on image quality. A column fixed pattern noise correction method for CMOS image sensors was proposed based on the analysis of emerge mechanism, noise characteristic and the behavior in the output image of the fixed pattern noise. It sampled the uniform and parallel light source which radiated from a integrating sphere more times use a CMOS image acquiring system and then estimated the column fixed pattern noise using these images. Then, the estimation result was used to correct the column fixed pattern noise in the CMOS image acquisition system. Experimental results show that with this method, the fixed pattern noise can be effectively reduced and the quality of the image can be increased.Accession Number: 20133816763222 -
Record 214 of
Title:Laser beam wave-front error reduction accuracy analysis
Author(s):Zhao, Jianke(1); Li, Xia(1); Xu, Liang(1); Duan, Yaxuan(1)Source: Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering Volume: 42 Issue: 1 DOI: Published: January 2013Abstract:In the laser parameters systems of big science projects, the installation errors of the shrink-beam system were analyzed. The result shows that the defocus between the objective lens system and the eyepiece system affects the wavefront distortion error of the system most. Besides, the PV values of the wavefront aberration caused by the defocus between the objective lens system and the eyepiece system of the shrink-beam system were analyzed and a conclusion that there was a non-linear relationship between the PV values and the defocus was drawn. By the test system composed of large aperture long focal length collimator, fiber lasers and Hartmann wavefront sensors, the wavefront aberration of the laser shrink-beam system was measured and verified real-time. The result shows that by wavefront computer-aided technology, the PV values of wavefront aberration can be less than 0.2λ (λ=1.053 μm).Accession Number: 20131316153564 -
Record 215 of
Title:Objective evaluation approach of color balance for colorful digital image
Author(s):Guo, Huinan(1); Cao, Jianzhong(1); Zhou, Zuofeng(1); Zhu, Qing(1); Liu, Chen(1); Wang, Feng(1)Source: Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering Volume: 42 Issue: SUPPL.1 DOI: Published: 2013Abstract:Color performance of colorful digital image was an important parameter to measure the quality of video capture and display devices. Objective evaluation of color balance for input image plays a vital role for equipment selection, debug and calibration. For the inadequacies of existing color balance evaluation methods, a novel evaluation algorithm was proposed which based on color gamut description. In CIE1931xy standard color gamut, according to the constant hue trajectory and constant saturation trajectory, judge the color property of tristimulus color as well as determine the characteristic triangle of tristimulus color. By building color-barycenter model, carry out global description for color character of input image and evaluate the color balance by using the proposed evaluation function. Experimental results show that the proposed evaluation methods in line with the habits of human visual system, which can intuitively response to color stimulus effect for human visual system; meanwhile, it can evaluate colorful natural images accurately and objectively which was of good robustness and practical value.Accession Number: 20134416940652 -
Record 216 of
Title:Energy design of Fourier telescope system in the atmospheric environment
Author(s):Luo, Xiujuan(1); Zhang, Yu(1); Sun, Xin(1); Cao, Bei(1); Zeng, Zhihong(1); Xia, Aili(1); Li, Libo(1); Zhu, Shaolan(1)Source: Guangxue Xuebao/Acta Optica Sinica Volume: 33 Issue: 8 DOI: 10.3788/AOS201333.0801004 Published: August 2013Abstract:Energy design technology is one of the key techniques of Fourier telescope. Laser propagation in the atmosphere and its impact on the energy of the laser beams are analyzed. According to the uplink and downlink transmission of energy, a total laser energy calculation method of Fourier telescope system is derived, and the corresponding applicable conditions are given. Meanwhile, based on radiation theory, a fast energy estimation method is proposed by which the required total transmitter energy of a Fourier telescope for 1000 km low-orbit objects is estimated. The effects of transmitter energy imbalance on the image quality are pointed out and simulated. It can be concluded that the intensity differences among laser beams of transmitter array must be less than 5%. From the atmospheric transmittance, laser emitting aperture, beam collimation, transmitting scheme, speckle effect, receiving technologies, image reconstruction techniques and other aspects, the design ideas and measurements to reduce energy loss are put forward.Accession Number: 20134216860485