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this is image frequency transform
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给定函数,变换到频域内,比较短时傅里叶变换大、小视窗和小波变换的区别,生成时频分析图,A given function, transform the frequency domain, more short-time Fourier transform, and a small window and the difference between wavelet transform to generate time-frequency analysis
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改进拉普拉斯能量和的尖锐频率局部化
Contourlet 域多聚焦图像融合方法-Sum-modified-Laplacian-based Multifocus Image
Fusion Method in Cycle Spinning Sharp Frequency
Localized Contourlet Transform Domain
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Please run Demo_evaluation.m
This toolbox contains Matlab files that implement the image fusion criteria used in my paper
Qu Xiao-Bo, YAN Jing-Wen, XIAO Hong-Zhi, ZHU Zi-Qian. Image Fusion Algorithm Based on Spatial Frequency-Motivated P
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GaussianLfilter.m 图像的高斯低通滤波函数 Highboostfilter.m 图像的高频提升函数 HighEmphasisfilter.m 图像的高频增强函数 imRadon.m 图像的Radon变换.-GaussianLfilter.m Gaussian image Highboostfilter.m low-pass filter function to enhance the image of the high-frequency high-frequency funct
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基于VC++图像处理程序,包含图像频率域变换处理,包括滤波。-Based on VC++ image processing procedures, including frequency domain transform image processing, including filtering.
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本实验要求开发一个2-D FFT程序包,使其可以应用于后续的几个实验。这个程序需要完成的功能是用因子(-1)^(x+y)乘以输入图像以实现滤波的中心变换,并还要求用一个实矩阵乘以一个复数矩阵通过调用两个图像的乘法程序来实现对应元素的相乘,同时计算反傅立叶变换,得到的结果乘以(-1)^(x+y)并取其实部最后计算频谱。实验中用到傅立叶变换的基本公式,通过实验我们可以更加深刻的理解频域滤波的基础。-The experiment calls for the development of a 2-D F
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频率域熵图,两个窗口,熵的径向和角向分布,便于分析纹理,还有一个自己写的gabor变换,请参考。-Frequency domain entropy map, two windows, the entropy of the radial and angular distribution, to facilitate analysis of texture, there is a transform gabor wrote it myself, please refer to.
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2-band discrete wavelet transform (DWT)
Dual-Tree Complex Wavelet Packet-The 2-band discrete wavelet transform (DWT) provides
an octave-band analysis in the frequency domain, but this
might not be ‘optimal’ for a given signal. The discrete wave
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小波变换方法采用对高频系数平均的方法实现图像融合算法-Wavelet transform coefficients using the average of the high-frequency method to achieve image fusion algorithm
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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 improv
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以C sharp編程快速富里葉變換頻率成分濾波頻率方位濾波-In C sharp programming Fast Fourier Transform frequency components filtered frequency direction filter
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用傅里叶变换对图形进行变换,然后用高斯低通、高通滤波器对图像进行去噪-Fourier transform graphics transform, and then use Gaussian low-pass, high pass filter for image denoising
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滤波器的设计
线性滤波
卷积与相关
imfilter 滤波函数
预定义滤波
FIR 滤波器的设计
FIR 滤波器基础
计算二维频率响应
计算期望频率响应矩阵
频率变换法 频率采样法
窗函数法 -The design of linear filtering, convolution filter and associated filtering function imfilter predefined filter F
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信号频谱分析
1. 观测已知方波信号、正弦波信号的频谱
分析频率为4KHz、8KHz的占空比为50 的方波信号、正弦波信号的频谱。记录所得频谱图。
观测实时模拟信号(语音)的频谱
用音频设备采集一段语音,将语音存为.wav格式。对wav文件作分段傅里叶变换分析。语音是分音节的,应把它分段分析,而且实际运用中的数字信号处理的FFT的点数是有限的,一般只能达到千点。用傅里叶反变换IFFT,从频域恢复信号。画出频谱图和语音波形图-Signal spectrum analysis 1.
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借助小波变换在时频分析上的优点,提取地面运动目标的回波信号特征在目标识别中加以运用-With wavelet transform in time-frequency analysis of the advantages of extracting ground moving target echo signal characteristics to be used in target recognition
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各种的图像处理函数,图像的灰度变换,图像的正交变换,空域滤波,频域滤波,以及特效滤波,直接可用无需修改。-Variety of image processing functions, image gray level transformation, image orthogonal transform, spatial filtering, frequency domain filtering, and special effects filters, can be used directly
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频率变换 二维离散傅里叶变换 幅度图像和相位图像 频率方位滤波-Frequency transform two-dimensional discrete Fourier transform amplitude image and phase image frequency direction filter
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频率变换、二维快速傅里叶变换、频率成分滤波、频率方位滤波-Frequency transform, two-dimensional fast Fourier transform, a frequency component filtering, frequency filtering orientation
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this is image frequency transform,vevr good-This is the image frequency transform, vevr good
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