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Spatial frequency speetrum 频谱
It includes topics such as spatial frequency filtering, holography. 它包括空间频率滤光、全息摄影。
Luminance masking and spatial frequency masking were considered in our scheme. 此方法考虑了人的视觉所具有的亮度屏蔽和空间频率屏蔽特性。
The results revealed mild lowering contrast sensitivity at high spatial frequency for our glaucoma patients. 然而特定轴度之闪光眩耀测试结果并未见明显差别。
The Collins formula and tensor ABCD law in spatial frequency domain provide the relation between the input spatial Fourier spectrum and the output spectrum directly. 空间频率域中的柯林斯公式和张量ABCD定律直接给出了像散光束的空间傅里叶频谱的传输规律。
Analyzed is the dependence of the defocusing quantity on the hologram size and the spatial frequency bandwidth of the object. 分析了全息图尺寸及其记录的空间频带宽度与离焦量的关系;
The diffraction of surface acoustic waves in Raman-Nath regime on acoustic grating with linearly chirped spatial frequency is investigated. 本文将声表面波声栅上的Raman-Nath衍射现象研究发展到其周期的空间频率为线性变化的声栅情形。
The effects of radial position and the axial length of the electrode on the temporal frequency bandwidth are similar to the spatial frequency domain. 在时间频域内测量系统相当于带通滤波器,电极的轴向长度和颗粒径向位置对频带宽度的影响与空域频率特性相似;
Method Modulation transfer function (MTF) was used to analyze the spatial frequency transfer characteristics of CT and MRI. 调制传输函数可对线性影像系统的频率传输特性进行描述。
A new spatial frequency analysis method based on wavelet was applied to homomorphic filtering to enhance the contrast of ICT image. 针对ICT图像对比度低、边缘模糊、细节不清晰等问题,提出采用基于小波的同态滤波算法来对图像进行增强。
A method of super-resolution imaging is described, which utilizes cosine fringes to acquire more spatial frequency spectrum of the object. 研究了一种高分辨率成像的方法，该方法利用余弦条纹照射目标以获取目标更宽的频谱。
Nyquist frequency defined as the highest spatial frequency where the sensor can still faithfully record image detail. Beyond the Nyquist frequency aliasing occurs. 奈奎斯特频率的定义是：感光器能够忠实纪录影像细节的最高空间频率。在此频率以上就会发生混肴现象。
A more accurate way to look at the sensitivity of an imaging system is to evaluate the Detective Quantum Efficiency (DQE) as a function of spatial frequency. 研究成像系统灵敏度的一个更精确的办法是精确一个考虑成像系统是将量子检测效率(DQE)当作空间频率的函数来计算。
Methods The fractures of the ribs of 512 patients were suspected in clinic, and those CR images were processed with gradation and spatial frequency technology. 方法对临床怀疑肋骨骨折512例患者的肋骨CR影像应用谐调处理与空间频率处理的方法进行技术处理。
This paper studies intensively the "bilinear interpolation and 2D-IFFT" method of reconstructing image from the unevenly spaced data in the spatial frequency domain. 本文深入研究了由空间频域上的非均匀采样数据重建图象的“双线性插值加二维快速傅里叶反变换”方法。
Methods based on spatial frequencies evaluate the coefficients of the autocorrelation function of the texture. 基于空间频率的方法估计纹理的自相关函数。
Using a method of the spatial frequency filtering by combining the directional filtering with the very low frequency filtering, the desirable optical signals cau be taken out of a considerably complex image. 采用方向性滤波与极低频滤波相结合的方法;可以从较复杂的图象中提取所需用的信号.
Visual evoked potentials (VEP) to square-wave gratings (spatial frequency 1.4 c/deg. , flickering frequency 2.9 Hz, contrast 0.94) at various stimulus locations on the retina were recorded from human occipital scalp. 以人视觉诱发电位(VEP)反应为指标;在视野的不同位置测定了VEP对四个方位的闪烁方波光栅刺激(时间频率2.;9Hz;空间频率1
The Collins formula in spatial frequency domain is generalized into axially nonsymmetrical optical system in terms of tensor analysis method. Based on this formula, the tensor ABCD law in spatial frequency domain is derived. 运用张量分析方法把轴对称系统中的空间频率域的柯林斯公式推广到一般的非轴对称光学系统 ,并推导了在空间频率域中适用于非轴对称光学系统的张量ABCD定律。
In order to simply obtain the phase of a surface in phase measuring profilometry (PMP), a fully automatic phase unwrapping method based on projected double spatial frequency fringes has been deduced. 为了在相位轮廓测量术中更简便可靠地获取待测面的相位场，提出了一种利用双频投影条纹的叠栅特性进行全自动相位解包裹的方法。