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Description: Ridge_WindowFT窗口傅立叶变换的脊
CohenDist Cohen类时频分布-Ridge_WindowFT window Fourier Transform ridge CohenDist Cohe n type time-frequency distribution
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Size: 10624 |
Author: cicinati |
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Description: Ridge_WindowFT窗口傅立叶变换的脊
CohenDist Cohen类时频分布-Ridge_WindowFT window Fourier Transform ridge CohenDist Cohe n type time-frequency distribution
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Size: 10240 |
Author: cicinati |
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Description: 经典的Gabor滤波算法实现，利用指纹的局部特征包括脊线频率和方向通过求卷积实现带通滤波。-Classic Gabor filtering algorithm, using local features, including fingerprint ridge frequency and orientation, through seeking to achieve band-pass filter convolution.
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Size: 1024 |
Author: heying |
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Description: 根据指纹的固有规律，提出了一套较完整的指纹图像预处理和特征提取算法。改进了指纹脊线频率求取算法和二值图像去孔噪声
算法，并提出了一种新的滤除指纹伪特征点的方法。通过对上百幅不同质量的指纹图像进行测试，获得了较好的效果。
关键词：指纹；预处理；特征提取-According to the inherent laws of fingerprints, a set of more complete fingerprint image pre-processing and feature extraction algorithm. To improve the frequency of the fingerprint ridge strike algorithms and binary image noise algorithm to hole, and filter out a new fingerprint method of pseudo-feature points. Increase by hundreds of different fingerprint image quality testing, to obtain good results. Key words: fingerprint pretreatment Feature Extraction
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Size: 200704 |
Author: martin |
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Description: 基于Gabor变换的图像纹理识别。
提出了一种改进的Gabor变换的图像纹理增强算法，将空域的纹理图像变换到联合空间频率域并将联合空间
频率域的能量分布作为掌纹的特征，Gobar滤波器在频域内对子块其主方向上频率能量分布进行滤波，特征向量进行了匹配
识别，增强特征纹线信息并对核心区域进行多方向空间频率能量滤波合成，同时也对滤波算法进行了优化，有效地减少了运
算量。-Gabor transform based image texture recognition. An improved image of the Gabor transform texture enhancement algorithm, the airspace of the texture image transform frequency domain to the joint space and joint space frequency domain characteristics of the energy distribution as a palm, Gobar filter pair in the frequency domain block its the main direction of the energy distribution of the frequency filtering, feature vectors were matched to identify, enhance the features of ridge information as well as the core region of multi-dimensional spatial frequency energy filter synthesis, but also on the filtering algorithm has been optimized, effective in reducing the computational complexity.
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Size: 820224 |
Author: 爱学习 |
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Description: Estimate fingerprint ridge frequency within image block
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Size: 2048 |
Author: hazem tarek |
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Description: 跳频图案的产生模块，互相学习，参考一下挺有帮助的-Frequency hopping pattern generation module, mutual learning, reference winter ridge help
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Size: 60416 |
Author: 冯强 |
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Description: 提取指纹特征点的matlab代码，很有用，利用自适应阈值进行分割，再进行频域增强，根据八邻域纹线编码进行特征提取。-Extracted fingerprint feature points of the matlab code, useful, adaptive threshold segmentation, and then increased in frequency domain, the eight neighborhood ridge coding for feature extraction.
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Size: 583680 |
Author: 李辉艳 |
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Description: 针对小波变换在指纹识别中的应用，提出了一种基于小波变换的图像增强算法，利用低频系数图像在小波域估计指纹纹线方向，抑制了高频噪声对纹线方向的影响，实验表明，该算法对纹线模糊的指纹图像增强效果明显。-According to the fingerprint identification of wavelet transform in the application, and puts forward a kind of image based on wavelet transform enhancement algorithm, using image in low-frequency coefficients of wavelet domain estimate ridge directions, restrain the fingerprint of high-frequency noise, the influence of ridge directions experiments show that this algorithm for lines blurred image enhancement effect is obvious.
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Size: 201728 |
Author: 抓党建 |
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Description: block ridge frequency count
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Size: 2048 |
Author: tupe |
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Description: 指纹图像增强，gabor滤波器，包括形态学分割，形态学细化，加窗短时傅里叶变换增强，方向图估计及平滑，纹线频率估计及平滑-Fingerprint image enhancement, gabor filters, normalization, equalization, morphological segmentation, morphological thinning, windowed short time Fourier transform enhanced estimates and smooth pattern, ridge frequency estimation and smoothing
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Size: 3072 |
Author: yx |
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Description: 指纹增强的matlab实现源代码，包含多个matlab函数文件。-ridgesegment.m identifies ridge-like regions of a fingerprint image. It also normalises the intensity values of the image.
ridgeorient.m estimates the local orientation of ridges in a fingerprint.
plotridgeorient.m plots ridge orientations calculated by ridgeorient.
ridgefreq.m estimates the local ridge frequency across a fingerprint image.
freqest.m estimates the ridge frequency within a small block of an image. This is used by ridgefreq.
ridgefilter.m enhances a fingerprint image using oriented filters.
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Size: 10240 |
Author: tc |
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Description: 利用二维有限差分法对单脊波导TM模进行计算。通过调整网格数目观察计算结果的精度，可以设定出最优的网格数目，然后改变波导中脊的尺寸，观察最低两个TM模对应的截止频率的变化规律，最后给出对应的横截面电场、磁场分布图-The two-dimensional finite difference method to calculate the single-ridge waveguide TM mode. The optimal number of grid can be set by the accuracy of the adjustment of the calculation result of the grid number observed, and then change the size of the waveguide ridge observed the lowest two corresponding to the TM mode of the cutoff frequency of the variation, and finally to give the corresponding cross cross-section of the electric field, magnetic field maps
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Size: 110592 |
Author: aa |
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Description: 对结构响应信号进行连续复Morlet小波变换，根据小波系数的模极大值提取小波脊线，识别结构的瞬时频率；为降低噪音的影响，采用奇异值分解(SVD)方法进行降噪处理，建立了一种基于连续复小波变换识别时变系统
瞬时频率的方法。用一个具有时变刚度的弹簧质量系统的数值算例验证方法的有效性，随后设计了一个时变拉索
结构试验，分别对索施加线性和正弦变化的拉力，同时测试结构的冲击响应，运用提出的方法成功地识别了索的瞬时频率。数值与试验结果表明，提出的方法能有效地识别时变结构的瞬时频率，且识别方法具有一定的抗噪性。-On the structural response signal continuously Complex Morlet wavelet transform, the wavelet coefficients extracted wavelet modulus maxima ridge line, identify the structure of the instantaneous frequency to reduce the effects of noise, using singular value decomposition (SVD) method for noise reduction, the establishment of A complex wavelet transform based on continuous time-varying systems instantaneous frequency identification method. With a time-varying stiffness spring-mass system numerical example effectiveness of the method, followed by the design of a time-varying cable structural testing, respectively Suoshi Jia linear and sinusoidal variation of tension, while the impulse response of the test structure, the use of the proposed method successfully identified the cable instantaneous frequency. Numerical and experimental results show that the proposed method can effectively identify the structure of time-varying instantaneous frequency, and the identification method has some n
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Size: 400384 |
Author: 张力 |
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Description: 基于随机减量法得到自由衰减时程，并进行去噪，后小波变换，拾取小波脊线处的幅值以及相位信息，提取自振频率及模态-The random decrement method based on free decay time, and after denoising, wavelet transform, wavelet ridge is picking up the amplitude and phase information extraction, natural vibration frequency and mode
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Size: 1024 |
Author: maojianxiao |
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Description: Ridge Frequency matlab code.
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Size: 1024 |
Author: abstemiousved |
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Description: 线性调频信号的时频分析，画出了调频信号的时频脊。-The linear FM signal time-frequency analysis to draw the time-frequency ridge FM signal。
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Size: 1024 |
Author: 思虑 |
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Description: 对仿真信号进行时频分析，单峰检测，脊线提取，脊线拟合，计算脊线波动方差，从而判断信号类别。本次仿真采用的是线性调频信号，对其他信号也具有适用性。对仿真信号进行时频分析，单峰检测，脊线提取，脊线拟合，计算脊线波动方差，从而判断信号类别。-The time-frequency analysis of the simulation signal, unimodal detection, ridge line extraction, ridge line fitting, fluctuation variance calculation ridge line, to determine the signal classification.USES a linear frequency modulation signal, the simulation also has the applicability for other signals.The time-frequency analysis of the simulation signal, unimodal detection, ridge line extraction, ridge line fitting, fluctuation variance calculation ridge line, to determine the signal classification.
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Size: 1024 |
Author: 刘婷 |
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Description: 时频分析，用于信号的时频分析，短时傅里叶变换、小波、脊线提取、一些信号的生成，等等。-Time-frequency analysis, time-frequency analysis for signal, short time Fourier transform, wavelet ridge line extraction, generate some signal, and so on.
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Size: 2323456 |
Author: 李帅 |
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Description: Calculates a ridge frequency image
Function to estimate the fingerprint ridge frequency across a fingerprint image. This is done by considering blocks of the image and
determining a ridgecount within each block by a call to FREQEST.
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Size: 1024 |
Author: Amine07 |
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