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文章名     作者     期刊名     摘要     卷     期         如果没有找到您所需要的文献，请点击 ——此处申请     共30条记录   Continuous-wave terahertz scanning image resolution analysis and restoration [作者：Li, Q; Yin, QG; Yao, R; Ding, SH; Wang, Q,期刊：OPTICAL ENGINEERING, 页码：37007-37007 , 文章类型： Article，,卷期：2010年49-3] Resolution of continuous-wave (CW) terahertz scanning image is limited by many factors among which the aperture effect of finite focus diameter is very important. We have investigated the factors that affect terahertz... Steganography scheme based on side match vector quantization [作者：Chen, LST; Lin, JC,期刊：OPTICAL ENGINEERING, 页码：37008-37008 , 文章类型： Article，,卷期：2010年49-3] We propose a steganographic method that is based on side match vector quantization (SMVQ). The secret data are encrypted and then embedded in an SMVQ-decompressed image. In the decoding process, both the hidden secret an... Face recognition based on fringe pattern analysis [作者：Guo, H; Huang, P,期刊：OPTICAL ENGINEERING, 页码：37201-37201 , 文章类型： Article，,卷期：2010年49-3] Two-dimensional face-recognition techniques suffer from facial texture and illumination variations. Although 3-D techniques can overcome these limitations, the reconstruction and storage expenses of 3-D information are e... Homography estimation from planar contours in image sequence [作者：Zhai, M; Fu, S; Jing, ZL,期刊：OPTICAL ENGINEERING, 页码：37202-37202 , 文章类型： Article，,卷期：2010年49-3] Homography can be estimated from corresponding points, lines, or textures. But in some scenarios these features are not always available. As a supplement, the newly developed contour-based method is presented, which can ... Clustering method for counting passengers getting in a bus with single camera [作者：Yang, T; Zhang, YN; Shao, DP; Li, Y,期刊：OPTICAL ENGINEERING, 页码：37203-37203 , 文章类型： Article，,卷期：2010年49-3] Automatic counting of passengers is very important for both business and security applications. We present a single-camera-based vision system that is able to count passengers in a highly crowded situation at the entranc... Empirical mode decomposition-based facial pose estimation inside video sequences [作者：Qing, CM; Jiang, JM; Yang, ZJ,期刊：OPTICAL ENGINEERING, 页码：37401-37401 , 文章类型： Article，,卷期：2010年49-3] We describe a new pose-estimation algorithm via integration of the strength in both empirical mode decomposition (EMD) and mutual information. While mutual information is exploited to measure the similarity between facia... Videogrammetric system for dynamic deformation measurement during metal sheet welding processes [作者：Liu, JW; Liang, J; Liang, XH; Tang, ZZ,期刊：OPTICAL ENGINEERING, 页码：33601-33601 , 文章类型： Article，,卷期：2010年49-3] A videogrammetric system is proposed for monitoring the 3-D deformation time history of a metal sheet surface during welding, which could not be achieved by traditional displacement sensors. Two commercial-grade digital ... Color quality scale [作者：Davis, W; Ohno, Y,期刊：OPTICAL ENGINEERING, 页码：33602-33602 , 文章类型： Article，,卷期：2010年49-3] The color rendering index (CRI) has been shown to have deficiencies when applied to white light-emitting-diode-based sources. Furthermore, evidence suggests that the restricted scope of the CRI unnecessarily penalizes so... Multiple calibration bench for focal length of cameras by means of laser distance meter [作者：Rodriguez, J; Martin, MT; Herraez, J; Irigoyen, J; Arias, P,期刊：OPTICAL ENGINEERING, 页码：33603-33603 , 文章类型： Article，,卷期：2010年49-3] The calibration of the cameras used in close-range photogrammetry is usually performed using auxiliary elements with known geometry and/or dimensions, through one or several photographs of elements with geometrical restr... Direct measurement of curvature and twist using two-channel double-aperture digital shearography [作者：Bhaduri, B; Tay, CJ; Quan, CG,期刊：OPTICAL ENGINEERING, 页码：33604-33604 , 文章类型： Article，,卷期：2010年49-3] A direct method of determining second-order derivatives of displacement (curvature and twist) using two-channel double-aperture digital shearography is presented. Spatial carrier fringes are incorporated inside the speck... Sandwich holography for studying convective fields: performance analysis [作者：Ambrosini, D; Paoletti, D; Di Biase, R,期刊：OPTICAL ENGINEERING, 页码：33605-33605 , 文章类型： Article，,卷期：2010年49-3] Recently, sandwich holography was proposed in heat transfer studies. This technique can provide the temperature gradient without the need to calculate the temperature map and then numerically differentiate it; also phase... Measurement for 90-deg error of dihedral angles of glass cubes [作者：Li, B; Chen, L; He, Y,期刊：OPTICAL ENGINEERING, 页码：33606-33606 , 文章类型： Article，,卷期：2010年49-3] A method for testing the 90-deg error of dihedral angles of glass cubes is proposed. The test beam of a Fizeau interferometer enters the cube and is retroreflected by a dihedral angle to interfere with the reference beam... Alignment procedure for radiation pattern measurements of antenna-coupled infrared detectors [作者：Krenz, PM; Slovick, BA; Bean, JA; Boreman, GD,期刊：OPTICAL ENGINEERING, 页码：33607-33607 , 文章类型： Article，,卷期：2010年49-3] An antenna-coupled detector's directional properties can be verified by measuring its angular radiation pattern. At infrared frequencies, this pattern can be measured by rotating the device while illuminating it with a l... Pixel size determination of a monitor using moire fringe [作者：Abolhassani, M,期刊：OPTICAL ENGINEERING, 页码：33608-33608 , 文章类型： Article，,卷期：2010年49-3] Displaying of images on monitors actually samples them. When a sinusoidal image is displayed on a monitor, a frequency that is much smaller than the frequency of the original image might be seen, which appears as a moire... New overdrive technology for liquid-crystal displays with a simple architecture [作者：Cho, Y; Park, C; Bhowmik, A; Lee, SW,期刊：OPTICAL ENGINEERING, 页码：34001-34001 , 文章类型： Article，,卷期：2010年49-3] We propose a new technique to extract overdrive (OD) values that are indispensable to improve response characteristics of liquid-crystal displays. We show the relation among an OD value (D-OD), a previous frame data (D-P... Liquid crystal wavelength-independent continuous polarization rotator [作者：Aharon, O; Abdulhalim, I,期刊：OPTICAL ENGINEERING, 页码：34002-34002 , 文章类型： Article，,卷期：2010年49-3] We demonstrate a wavelength-independent tunable liquid crystal (LC) polarization rotator using two nematic LC retarders for the spectral range from 450 to 1000 nm and wider. The first LC device with tunable retardation d...