Journals >Chinese Optics Letters
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2012
Volume: 10 Issue 1
24 Article(s)
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Fiber Optics and Optical Communications
Effects of pattern dependence on high-power polarization-division-multiplexing applications
Anlin Yi, Lianshan Yan, Bin Luo, Wei Pan, and Jia Ye
High-power polarization-division-multiplexing (PDM) systems or functional modules, such as self-phasemodulation (SPM)-based all-optical regenerators, cross-phase-modulation (XPM)-based wavelength convertors or format convertors, all-optical logical gate, and so on, may suffer from the effects of pattern dependence. SucHigh-power polarization-division-multiplexing (PDM) systems or functional modules, such as self-phasemodulation (SPM)-based all-optical regenerators, cross-phase-modulation (XPM)-based wavelength convertors or format convertors, all-optical logical gate, and so on, may suffer from the effects of pattern dependence. Such effects are experimentally investigated using relative time delay variation between bit sequences with orthogonal polarization states in a 2 ￡ 10.65 Gb/s high-power on-off keying (OOK) PDM system. Eye-diagram-based signal-to-noise ratio (SNR) and bandwidth of broadened spectrum are measured and compared. An eye-diagram-based SNR fluctuation of up to 4 dB may occur as the delay changes..
Chinese Optics Letters
- Publication Date: Aug. 05, 2011
- Vol. 10, Issue 1, 010601 (2012)
High power dual-wavelength tunable fiber laser in linear and ring cavity configurations
H. Ahmad, A. A., M. Z., N. A., and S. W.
We describe and compare the performances of two crucial configurations for a tunable dual-wavelength fiber laser, namely, the linear and ring configurations. The performances of these two cavities and the tunability in the dual-wavelength output varied from 0.8 to 11.9 nm are characterized. The ring cavity provides a bWe describe and compare the performances of two crucial configurations for a tunable dual-wavelength fiber laser, namely, the linear and ring configurations. The performances of these two cavities and the tunability in the dual-wavelength output varied from 0.8 to 11.9 nm are characterized. The ring cavity provides a better performance, achieving an average output power of 0.5 dBm, with a power fluctuation of only 1.1 dB and a signal-to-noise ratio (SNR) of 66 dB. Moreover, the ring cavity has minimal or no background amplified spontaneous emission (ASE)..
Chinese Optics Letters
- Publication Date: Aug. 30, 2011
- Vol. 10, Issue 1, 010603 (2012)
Image Processing
Unsupervised regions of interest extraction for color image compression
Xiaoguang Shao, Kun Gao, Lili Lv, and Guoqiang Ni
A novel unsupervised approach for regions of interest (ROI) extraction that combines the modified visual attention model and clustering analysis method is proposed. Then the non-uniform color image compression algorithm is followed to compress ROI and other regions with different compression ratios through the JPEG imaA novel unsupervised approach for regions of interest (ROI) extraction that combines the modified visual attention model and clustering analysis method is proposed. Then the non-uniform color image compression algorithm is followed to compress ROI and other regions with different compression ratios through the JPEG image compression algorithm. The reconstruction algorithm of the compressed image is similar to that of the JPEG algorithm. Experimental results show that the proposed method has better performance in terms of compression ratio and fidelity when comparing with other traditional approaches..
Chinese Optics Letters
- Publication Date: Aug. 05, 2011
- Vol. 10, Issue 1, 011001 (2012)
Quadric surface projection model for fish-eye cameras
Tiantian Meng, Jintao Jiang, and Ming Yang
The curved surface projection model in fisheye image correction algorithm is presented. To analyze the causes of distortion in existing models, we establish an ideal surface projection model and compare its surface with the surfaces of existing models. Subsequently, feature points are obtained on the ideal surface accoThe curved surface projection model in fisheye image correction algorithm is presented. To analyze the causes of distortion in existing models, we establish an ideal surface projection model and compare its surface with the surfaces of existing models. Subsequently, feature points are obtained on the ideal surface according to the relationship of coordinates of fish-eye image points and their ideal three-dimentional (3D) points. Finally, the least square method is used to obtain a quadric surface and presents a quadric surface projection model. The experiment shows that the corrected image of the new model is more similar to the actual scene than the corrected images of previous models..
Chinese Optics Letters
- Publication Date: Aug. 30, 2011
- Vol. 10, Issue 1, 011002 (2012)
Imaging Systems
Autostereoscopic 3D projection display based on two lenticular sheets
Lin Qi, Qionghua Wang, Jiangyong Luo, Aihong Wang, and Dong Liang
We propose an autostereoscopic three-dimensional (3D) projection display. The display consists of four projectors, a projection screen, and two lenticular sheets. The operation principle and calculation equations are described in detail and the parallax images are corrected by means of homography. A 50-inch autostereosWe propose an autostereoscopic three-dimensional (3D) projection display. The display consists of four projectors, a projection screen, and two lenticular sheets. The operation principle and calculation equations are described in detail and the parallax images are corrected by means of homography. A 50-inch autostereoscopic 3D projection display prototype is developed. The normalized luminance distributions of viewing zones from the simulation and the measurement are given. Results agree well with the designed values. The proposed prototype presents full-resolution 3D images similar to the conventional prototype based on two parallax barriers. Moreover, the proposed prototype shows considerably higher brightness and efficiency of light utilization..
Chinese Optics Letters
- Publication Date: Aug. 05, 2011
- Vol. 10, Issue 1, 011101 (2012)
Integrated Optics
Optimization of T-shaped waveguide branches in two-dimensional photonic crystals
Lin Huang, Bing Chen, Yongdong Li, and Chunliang Liu
The interval and the radius of a pair of defect dielectric rods in waveguide channels near the branching region of a T-shaped waveguide branches are simultaneously varied, and their effects on the transmission properties are investigated using the finite-difference time-domain (FDTD) method. Numerical results show thatThe interval and the radius of a pair of defect dielectric rods in waveguide channels near the branching region of a T-shaped waveguide branches are simultaneously varied, and their effects on the transmission properties are investigated using the finite-difference time-domain (FDTD) method. Numerical results show that there is an optimized region where the relative bandwidth of high-transmission (total transmittance >0.95) band of the branches is larger than 17%, which is higher than that of the existing same structures (11.60%) with fixed interval. These results provide for engineering application of simple T-shaped waveguide branches with high transmission..
Chinese Optics Letters
- Publication Date: Aug. 24, 2011
- Vol. 10, Issue 1, 011301 (2012)
Lasers and Laser Optics
Array size scaling of passive coherent beam combination in fiber laser array
Yuhao Xue, Bing He, Jun Zhou, Jinchong Xue, Zhen Li, Houkang Liu, and Qihong Lou
Array size scaling of passive coherent beam combination is explored theoretically. The Strehl ratio variation with wavelength is simulated in 4-, 9-, 16-, and 25-channel fiber arrays. The average Strehl ratio and phase error are calculated. The Strehl ratio is found to be near 100% for arrays with less than 5 fibers, bArray size scaling of passive coherent beam combination is explored theoretically. The Strehl ratio variation with wavelength is simulated in 4-, 9-, 16-, and 25-channel fiber arrays. The average Strehl ratio and phase error are calculated. The Strehl ratio is found to be near 100% for arrays with less than 5 fibers, but decreases significantly for larger arrays. These results are in good agreement with the recent experimental results..
Chinese Optics Letters
- Publication Date: Aug. 24, 2011
- Vol. 10, Issue 1, 011401 (2012)
Frequency stabilization of pulsed CO2 laser using setup-time method
Lili Wang, Zhaoshuo Tian, Yanchao Zhang, Jing Wang, Shiyou Fu, Jianfeng Sun, and Qi Wang
A new method for laser-frequency stabilization by controlling the pulse setup time is presented. The frequency-stabilization system monitors the pulse setup time continuously, and controls it by adjusting the cavity length. Laser frequency is stabilized to the center of the gain curve when the setup time is the shortesA new method for laser-frequency stabilization by controlling the pulse setup time is presented. The frequency-stabilization system monitors the pulse setup time continuously, and controls it by adjusting the cavity length. Laser frequency is stabilized to the center of the gain curve when the setup time is the shortest. The system is used to stabilize a radio-frequency-excited waveguide CO2 laser tuned by grating, and the shift of laser frequency is estimated to be less than §25 MHz for an extended period. The system has the advantages of compact structure, small volume, and low cost. It can be applied for frequency stabilization of other kinds of pulsed lasers with adjustable cavity..
Chinese Optics Letters
- Publication Date: Aug. 24, 2011
- Vol. 10, Issue 1, 011402 (2012)
Materials
Homogeneous-aligned high-transmission and fast-response liquid crystal display with three-layer electrodes
Xiduo Hu, Yubao Sun, Guoqiang Yang, Ying Xiang, and Junsheng Feng
A homogeneous-aligned, high-transmission, and fast-response liquid crystal display (LCD) with three-layer electrodes is proposed. The molecules of liquid crystals are more inclined to rotate above and between the pixel electrodes. This induces a much higher transmission than that of the cell driven by the fringe field A homogeneous-aligned, high-transmission, and fast-response liquid crystal display (LCD) with three-layer electrodes is proposed. The molecules of liquid crystals are more inclined to rotate above and between the pixel electrodes. This induces a much higher transmission than that of the cell driven by the fringe field switching method and a wide viewing angle simultaneously because of the combined fringe and in-plane electric fields. Furthermore, a trigger pulse voltage is applied between the top and common electrodes to forcibly align the liquid crystal molecules vertically to show the transient dark state, which results in a very fast turn-off time (>>1 ms). With high degree of transmission and fast response time, this kind of LCD is a potential candidate for large LCD panels..
Chinese Optics Letters
- Publication Date: Aug. 05, 2011
- Vol. 10, Issue 1, 011601 (2012)
Medical Optics and Biotechnology
Numerical simulation and experiment of optothermal response of biological tissue irradiated by continuous xenon lamp
Meizhen Huang, and Yaxing Tong
A finite element method computation model for analyzing optothermal interaction of polychromatic light and biology tissue is proposed and proven by experiment. A continuous xenon lamp is employed as an example. First, the spectral energy distribution of the xenon lamp is measured and found to be equivalent to a series A finite element method computation model for analyzing optothermal interaction of polychromatic light and biology tissue is proposed and proven by experiment. A continuous xenon lamp is employed as an example. First, the spectral energy distribution of the xenon lamp is measured and found to be equivalent to a series of quasi-chromatic light with different central wavelengths, different energies, and certain bandwidth. Next, according to the reported thermal and optical parameters of porcine skin and porcine liver, the temporal temperature distributions of these tissues irradiated by each quasi-chromatic light are simulated. Then, the thermal effect is superimposed to obtain the whole optothermal temporal temperature distribution. Moreover, the optothermal response experiments of fresh porcine skin and porcine liver tissues irradiated by continuous xenon lamp are carried out. The results of the simulation and experiment are analyzed and compared, and are found to be commendably matched..
Chinese Optics Letters
- Publication Date: Sep. 02, 2011
- Vol. 10, Issue 1, 011701 (2012)
Nonlinear Optics
Propagation dynamics of nonlinear chirped optical laser pulses in a two-level medium
Haifeng Yao, Yueping Niu, Yandong Peng, and Shangqing Gong
We investigate the propagation dynamics of nonlinear chirped optical laser pulses in a two-level medium. For certain chirp strength and chirp width, an incident 2π nonlinear chirped pulse will split into optical precursors and a stable self-induced transparency soliton. This is caused by the particular Fourier spectrumWe investigate the propagation dynamics of nonlinear chirped optical laser pulses in a two-level medium. For certain chirp strength and chirp width, an incident 2π nonlinear chirped pulse will split into optical precursors and a stable self-induced transparency soliton. This is caused by the particular Fourier spectrum that includes not only central resonant frequency components but also high-frequency and low-frequency sidebands. Moreover, the effects of chirp parameters on the evolution of nonlinear chirped pulses are also discussed..
Chinese Optics Letters
- Publication Date: Aug. 05, 2011
- Vol. 10, Issue 1, 011901 (2012)
Thin Films
Dispersive mirrors designed with mixed metal multilayer dielectric stacks
Jinlong Zhang, Zhanshan Wang, and Xinbin Cheng
A different approach to construct dispersive mirrors (DMs) for ultrafast applications is proposed based on the high reflectivity and constant phase property of a novel metal in ultrawide spectral band. A 200-nm bandwidth DM, a high dispersive DM, and a complementary DM are designed with mixed metal multilayer dielectriA different approach to construct dispersive mirrors (DMs) for ultrafast applications is proposed based on the high reflectivity and constant phase property of a novel metal in ultrawide spectral band. A 200-nm bandwidth DM, a high dispersive DM, and a complementary DM are designed with mixed metal multilayer dielectric stacks. The results show that the mixed-metal multilayer dielectric DMs (MMDMs) have much less layers and total thickness compared with an all-dielectric DM under the case of comparable performance. Such an approach will save manufacturing time and remarkably improve the stress of the DM..
Chinese Optics Letters
- Publication Date: Aug. 05, 2011
- Vol. 10, Issue 1, 013101 (2012)
Low power consumption bipolar resistive switching characteristics of ZnO-based memory devices
Jianwei Zhao, Fengjuan Liu, Jian Sun, Haiqin Huang, Zuofu Hu, and Xiqing Zhang
Ag/ZnO/Pt structure resistive switching devices are fabricated by radio frequency (RF) magnetron sputtering at room temperature. The memory devices exhibit stable and reversible resistive switching behavior. The ratio of high resistance state to low resistance state can reach as high as 102. The retention measurement iAg/ZnO/Pt structure resistive switching devices are fabricated by radio frequency (RF) magnetron sputtering at room temperature. The memory devices exhibit stable and reversible resistive switching behavior. The ratio of high resistance state to low resistance state can reach as high as 102. The retention measurement indicates that the memory property of these devices can be maintained for a long time (over 104 s under 0.1-V durable stress). Moreover, the operation voltages are very low, –0.4 V (OFF state) and 0.8 V (ON state). A high-voltage forming process is not required in the initial state, and multi-step reset process is demonstrated. Resistive switching device with the Ag/ZnO/ITO structure is constructed for comparison with the Ag/ZnO/Pt device..
Chinese Optics Letters
- Publication Date: Aug. 05, 2011
- Vol. 10, Issue 1, 013102 (2012)
Thinning and polishing of cross-section of depth-graded WSi2/Si multilayer for linear zone plate application
Qiushi Huang, Jingtao Zhu, Haochuan Li, Zhengxiang Shen, Xiaoqiang Wang, Zhanshan Wang, and Yongjian Tang
A linear zone plate named multilayer laue lens (MLL) is fabricated using a depth-graded multilayer structure. The lens shows considerable potential in focusing an X-ray beam into a nanometer scale with high efficiency. In this letter, a depth-graded multilayer consisting of 324 alternating WSi2 and Si layers with a totA linear zone plate named multilayer laue lens (MLL) is fabricated using a depth-graded multilayer structure. The lens shows considerable potential in focusing an X-ray beam into a nanometer scale with high efficiency. In this letter, a depth-graded multilayer consisting of 324 alternating WSi2 and Si layers with a total thickness of 7.9 \mu m is deposited based on the thickness sequence according to the demands of the zone plate law. Subsequently, the multilayer sample is sliced and thinned to an ideal depth along the cross-section direction using raw abrasives and diamond lapping. Finally, the cross-section is polished by a chemical mechanical polishing (CMP) technique to remove the damages and improve the surface smoothness. The final depth of the MLL is approximately 7 μm with an achieved aspect ratio greater than 400. Results of scanning electron microscopy (SEM) and atomic force microscopy (AFM) indicate that interfaces are sharp, and the multilayer structure remains undamaged after the thinning and polishing processes. The surface roughness achieved is 0.33 nm..
Chinese Optics Letters
- Publication Date: Aug. 24, 2011
- Vol. 10, Issue 1, 013103 (2012)
Dependence of wavefront errors on nonuniformity of thin films
Hongji Qi, Meiping Zhu, Weili Zhang, Kui Yi, Hongbo He, and Jianda Shao
In contrast to uncoated substrate, a nonlinear relationship of phase shift with the thicknesses of the thin film makes the calculation of wavefront aberration complicated. A program is compiled to calculate the wavefront aberration of multilayer thin film produced by thickness nonuniformity. The physical thickness and In contrast to uncoated substrate, a nonlinear relationship of phase shift with the thicknesses of the thin film makes the calculation of wavefront aberration complicated. A program is compiled to calculate the wavefront aberration of multilayer thin film produced by thickness nonuniformity. The physical thickness and the optical phase change on re°ection are considered. As an example, the wavefront aberration of the all-dielectric mirror is presented in ArF excimer lithography system with a typical thickness distribution. In addition, the wavefront errors of the thin film at wavelengths of 193 and 633 nm are compared in the one-piece and two-piece arrangements. Results show that the phase shift upon re°ection of the thin film produced by thickness nonuniformity is very sensitive to the incident angle, wavelength, and polarization..
Chinese Optics Letters
- Publication Date: Jul. 29, 2011
- Vol. 10, Issue 1, 013104 (2012)
Holography
Dual-channel phase-shifting interferometry for microscopy with second wavelength assistance
Juanjuan Zheng, Baoli Yao, Romano A., Tong Ye, Peng Gao, Junwei Min, and Rongli Guo
Dual-channel phase-shifting interferometry for simultaneous phase microscopy is presented. Red and blue light beams are used for microscope illumination. A 45o tilted beamsplitter replicates the object and reference waves in red light together with the object wave in blue light into two parallel beams. The two resultinDual-channel phase-shifting interferometry for simultaneous phase microscopy is presented. Red and blue light beams are used for microscope illumination. A 45o tilted beamsplitter replicates the object and reference waves in red light together with the object wave in blue light into two parallel beams. The two resulting quadrature phase-shifting interferograms in red light and the object waves in blue light are generated in the two channels. The two interferograms are recorded simultaneously by a color charge-coupled device (CCD) camera, and can be separated via RGB components of the recorded color patterns without crosstalk. As a result, the phase of tested specimen can be retrieved. The feasibility of the proposed method is demonstrated by test performed on a microscopic specimen..
Chinese Optics Letters
- Publication Date: Aug. 05, 2011
- Vol. 10, Issue 1, 010901 (2012)
Atomic and Molecular Physics
Probe frequency- and field intensity-sensitive coherent control effects in an EIT-based periodic layered medium
Teh-Chau Liau, Jin-Jei Wu, Jianqi Shen, and Tzong-Jer Yang
A periodic layered medium, with unit cells consisting of a dielectric and an electromagnetically-induced transparency (EIT)-based atomic vapor, is designed for light propagation manipulation. Considering that a destructive quantum interference relevant to a two-photon resonance emerges in EIT-based atoms interacting wiA periodic layered medium, with unit cells consisting of a dielectric and an electromagnetically-induced transparency (EIT)-based atomic vapor, is designed for light propagation manipulation. Considering that a destructive quantum interference relevant to a two-photon resonance emerges in EIT-based atoms interacting with both control and probe fields, an EIT-based periodic layered medium exhibits a flexible frequency-sensitive optical response, where a very small variation in the probe frequency can lead to a drastic variation in reflectance and transmittance. The present EIT-based periodic layered structure can result in controllable optical processes that depend sensitively on the external control field. The tunable and sensitive optical response induced by the quantum interference of a multi-level atomic system can be applied in the fabrication of new photonic and quantum optical devices. This material will also open a good perspective for the application of such designs in several new fields, including photonic microcircuits or integrated optical circuits..
Chinese Optics Letters
- Publication Date: Aug. 24, 2011
- Vol. 10, Issue 1, 010201 (2012)
Fourier Optics and Signal Processing
Fiber nonlinearity mitigation by PAPR reduction in coherent optical OFDM systems via biased clipping OFDM
Yaohong Hao, Yuquan Li, Rong Wang, and Weiwei Huang
A new method incorporating biased clipping orthogonal frequency division multiplexing (OFDM) is presented, which mitigates fiber nonlinear effects in a long-haul coherent optical OFDM (CO-OFDM) system. Under the scheme of the method, the wanted signal carried by odd subcarriers is orthogonal to clipping noise and a MacA new method incorporating biased clipping orthogonal frequency division multiplexing (OFDM) is presented, which mitigates fiber nonlinear effects in a long-haul coherent optical OFDM (CO-OFDM) system. Under the scheme of the method, the wanted signal carried by odd subcarriers is orthogonal to clipping noise and a Mach-Zehnder modulator (MZM) performs the optimal OFDM signal up-converter from the radio frequency (RF) domain to the optical domain. Analysis and simulation results show that fiber non-linear effects can be effectively mitigated by reducing the peak-to-average power ratio (PAPR) in biased clipping CO-OFDM system. The nonlinearity threshold (NLT) is improved by 5 dB with a reach of 240 km. With a fiber length up to 800 km, system Q value is improved by approximately 2.3, 1.2, and 0.6 dB at a chromatic dispersion of 6, 12, and 16 ps/(nm￠km), respectively. Additionally, system Q reaches the maximum when direct currect (DC) bias is equal to the mean value of the OFDM waveform..
Chinese Optics Letters
- Publication Date: Aug. 30, 2011
- Vol. 10, Issue 1, 010701 (2012)
Instrumentation, Measurement, and Metrology
Compact fiber optic accelerometer
Feng Peng, Jun Yang, Bing Wu, Yonggui Yuan, Xingliang Li, Ai Zhou, and Libo Yuan
A compact fiber optic accelerometer based on a Michelson interferometer is proposed and demonstrated. In the proposed system, the sensing element consists of two single-mode fibers glued together by epoxy, which then act as a simple supported beam. By demodulating the optical phase shift, the acceleration is determinedA compact fiber optic accelerometer based on a Michelson interferometer is proposed and demonstrated. In the proposed system, the sensing element consists of two single-mode fibers glued together by epoxy, which then act as a simple supported beam. By demodulating the optical phase shift, the acceleration is determined as proportional to the force applied on the central position of the two single-mode fibers. This simple model is able to calculate the sensitivity and the resonant frequency of the compact accelerometer. The experimental results show that the sensitivity and the resonant frequency of the accelerometer are 0.42 rad/g and 600 Hz, respectively..
Chinese Optics Letters
- Publication Date: Aug. 24, 2011
- Vol. 10, Issue 1, 011201 (2012)
Optics at Surfaces
Silver clusters insert into polymer solar cell for enhancing light absorption
Guolong Li, Hongyu Zhen, Zhuoyin Huang, Kan Li, Weidong Shen, and Xu Liu
As an employment of surface plasmonic effect, the consequence of insertion of a layer of Ag clusters into polymer solar cell on the enhancement of light absorption and power conversion efficiency is investigated. Optical analysis based on the finite-difference time-domain (FDTD) is performed with experiments to evaluatAs an employment of surface plasmonic effect, the consequence of insertion of a layer of Ag clusters into polymer solar cell on the enhancement of light absorption and power conversion efficiency is investigated. Optical analysis based on the finite-difference time-domain (FDTD) is performed with experiments to evaluate the effect of the interaction between the Ag clusters and incident light on light absorption in polymer solar cell. Ag clusters modify the light wave vector and the electromagnetic field inside the device is redistributed and enhanced. As a result, polymer solar cells achieve an overall increase in absorption, short-circuit current density, and power conversion efficiency..
Chinese Optics Letters
- Publication Date: Aug. 24, 2011
- Vol. 10, Issue 1, 012401 (2012)
Remote Sensing and Sensors
Development of all-solid coherent Doppler wind lidar
Xiaopeng Zhu, Jiqiao Liu, Decang Bi, Jun Zhou, Weifeng Diao, and Weibiao Chen
A 1 064-nm pulsed coherent Doppler lidar (CDL) prototype is developed to measure short range wind speed in the lower altitude troposphere layer. The CDL system adopts an injection{seeded Nd:YAG laser with the pulse duration of 80 ns, single pulse energy of 0.5 mJ, and pulse repetition rate of 200 Hz. Speed calibration A 1 064-nm pulsed coherent Doppler lidar (CDL) prototype is developed to measure short range wind speed in the lower altitude troposphere layer. The CDL system adopts an injection{seeded Nd:YAG laser with the pulse duration of 80 ns, single pulse energy of 0.5 mJ, and pulse repetition rate of 200 Hz. Speed calibration experiments are implemented to obtain a speed accuracy of 0.3 m/s using a hard target. Data analysis results show that the CDL system can obtain a line-of-sight wind velocity at a range of 30 to 500 m with the range resolution of 40 m and 38 pulses accumulation..
Chinese Optics Letters
- Publication Date: Jul. 29, 2011
- Vol. 10, Issue 1, 012801 (2012)
Scattering
Improved Monte Carlo model for multiple scattering calculations
Weiwei Cai, and Lin Ma
The coupling between the Monte Carlo (MC) method and geometrical optics to improve accuracy is investigated. The results obtained show improved agreement with previous experimental data, demonstrating that the MC method, when coupled with simple geometrical optics, can simulate multiple scattering with enhanced fidelitThe coupling between the Monte Carlo (MC) method and geometrical optics to improve accuracy is investigated. The results obtained show improved agreement with previous experimental data, demonstrating that the MC method, when coupled with simple geometrical optics, can simulate multiple scattering with enhanced fidelity..
Chinese Optics Letters
- Publication Date: Aug. 24, 2011
- Vol. 10, Issue 1, 012901 (2012)
Spectroscopy
Rapid matching algorithm for hyperspectral image based on norm sifting
Hao Li, Yong Ma, Kun Liang, and Yin Yu
We propose a rapid spectral matching method by lowering number of comparisons, processing time can be saved. Firstly, 1-norm is chosen as length measure of spectrum, and with this criterion, a 1-norm database is built. Secondly, a subspace is constructed from the whole reference library by retaining the references withWe propose a rapid spectral matching method by lowering number of comparisons, processing time can be saved. Firstly, 1-norm is chosen as length measure of spectrum, and with this criterion, a 1-norm database is built. Secondly, a subspace is constructed from the whole reference library by retaining the references with the most similar 1-norm values. Finally, matching operations are performed in the subspace to obtain the match result. Simulations of geological mapping with ASTER spectral library show that the proposed method can significantly reduce processing time and enhance accuracy compared with traditional and dimension reduction methods..
Chinese Optics Letters
- Publication Date: Aug. 24, 2011
- Vol. 10, Issue 1, 013001 (2012)
Vision, Color, and Visual Optics
Color separation criteria for spectral multi-ink printer characterization
Binyu Wang, Haisong Xu, and M. Ronnier
Seven color separation criteria are evaluated and compared for multi-ink printer characterization, which is a union of five 3-ink and six 4-ink cellular Yule-Nielsen spectral Neugebauer (CYNSN) submodels. In the experimental stage, testing reflectances from printing samples and Munsell color samples are employed. The rSeven color separation criteria are evaluated and compared for multi-ink printer characterization, which is a union of five 3-ink and six 4-ink cellular Yule-Nielsen spectral Neugebauer (CYNSN) submodels. In the experimental stage, testing reflectances from printing samples and Munsell color samples are employed. The results show that the prediction and actual accuracy of all the seven selection criteria are approximately the same for printing samples. As for the Munsell samples, the combE00 &MI outperforms other selection criteria because it combines one color difference with two metamerism indices, which are important for the heterogeneous samples during prediction..
Chinese Optics Letters
- Publication Date: Aug. 03, 2011
- Vol. 10, Issue 1, 013301 (2012)
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