Comparison of minimum-norm maximum likelihood and maximum a posteriori wavefront reconstructions for large adaptive optics systems [0.03%]
大型自适应光学系统中最小范数最大似然与最大后验波前重建的比较研究
Clémentine Béchet,Michel Tallon,Eric Thiébaut
Clémentine Béchet
The performances of various estimators for wavefront sensing applications such as adaptive optics (AO) are compared. Analytical expressions for the bias and variance terms in the mean squared error (MSE) are derived for the minimum-norm max...
Coupled-mode analysis of Bragg-reflection filters based on asymmetric nonlinear dual-core fibers [0.03%]
基于非对称双核光纤的Bragg反射滤波器的耦合模分析
Florence Y M Chan,Kiyotoshi Yasumoto,P Shum
Florence Y M Chan
We demonstrate a Bragg-reflection grating coupler using a nonlinear dual-core fiber with a long-period grating (LPG) and a fiber Bragg grating (FBG) inscribed in different cores. The LPG couples light from the primary core to the cladding, ...
Effect of the material of rough surfaces and the incident light polarization on the validity of the surface impedance boundary condition and the geometric optics approximation for reflection and emission [0.03%]
表面粗糙材料及入射光极化对反射和辐射的表观阻抗边界条件和几何光学近似的影响
Imed Sassi,Faouzi Ghmari,Mohamed Salah Sifaoui
Imed Sassi
Exact solutions for reflection and emission are compared to different approximations, the surface impedance boundary condition (SIBC) and the geometric optics approximation (GOA). The effects of the incidence angle, the material surfaces, t...
Pin Han
Pin Han
The far-field spectral anomalies of a short Gaussian pulse incident on a circular aperture with a variable wedge are theoretically studied, and some numerical examples are given to illustrate these effects. It is shown that some anomalous b...
Globally accelerated reconstruction algorithm for diffusion tomography with continuous-wave source in an arbitrary convex shape domain [0.03%]
任意凸形域连续波扩散断层扫描的全局加速重建算法
Natee Pantong,Jianzhong Su,Hua Shan et al.
Natee Pantong et al.
A new numerical imaging algorithm is presented for reconstruction of optical absorption coefficients from near-infrared light data with a continuous-wave source. As a continuation of our earlier efforts in developing a series of methods cal...
Estimating chromophore distributions from multiwavelength photoacoustic images [0.03%]
基于多波长光声图像的色素分布估计方法
B T Cox,S R Arridge,P C Beard
B T Cox
Biomedical photoacoustic tomography (PAT) can provide qualitative images of biomedical soft tissue with high spatial resolution. However, whether it is possible to give accurate quantitative estimates of the spatially varying concentrations...
Achieving resolution beyond the diffraction limit of telescopic optics with remote masking [0.03%]
利用远程掩模技术实现望远镜光学系统衍射极限以外的分辨率上限
Neil B Thomas
Neil B Thomas
The resolution of a telescope is traditionally limited by the size of its aperture and the associated diffraction limit. Increases in resolving power invariably require larger apertures. The dependence of resolution on a telescope size can ...
Mass detection on mammograms: influence of signal shape uncertainty on human and model observers [0.03%]
信号形状不确定性对人类和模型观察者乳房X线片中肿块检测的影响
C Castella,M P Eckstein,C K Abbey et al.
C Castella et al.
We studied the influence of signal variability on human and model observers for detection tasks with realistic simulated masses superimposed on real patient mammographic backgrounds and synthesized mammographic backgrounds (clustered lumpy ...
Phase-shift estimation in sinusoidally illuminated images for lateral superresolution [0.03%]
用于横向超分辨率的正弦照明图像相位差估计
Sapna A Shroff,James R Fienup,David R Williams
Sapna A Shroff
Sinusoidally patterned illumination has been used to obtain lateral superresolution and axial sectioning in images. In both of these techniques multiple images are taken with the object illuminated by a sinusoidal pattern, the phase of the ...
Multispectral intensity diffraction tomography: single material objects with variable densities [0.03%]
多光谱强度衍射层析成像：单材料且密度可变的对象
Mark A Anastasio,Qiaofeng Xu,Daxin Shi
Mark A Anastasio
A reconstruction theory for multispectral intensity diffraction tomography (I-DT) is established and investigated for use with single material objects whose dispersion characteristics are known a priori. Instead of varying the object-to-det...