cross-correlation % vector % n1 = length(x1) - 1; n2 = length(x2) - 1; if(n1 > n2) x1 = [zeros(1,n1) x1]; x2 = [x2 zeros(1,n1+n1-n2)]; else x1 = [zeros(1,n2) x1 zeros(1,n2-n1)]; x2 = [x2 zeros(1,n2)]; end y = ifft(fft(x1).*conj(fft(x2))); ...
A comparison of three PIV algorithms: FFT-based cross-correlation (FFT-CC) method, direct cross-correlation (DCC) method, and minimum quadratic difference ... 虞建,李荣先,周力行 - 《化工学报》 被引量: 6发表: 2005年 F2DPR: a fast and robust cross-correlation technique for volumetric PIV The...
Cross-CorrelationHilbert transformEnvelopeSpectral ResolutionThe paper presents comparison of results of impulse response spectral analysis that has been obtained using a method based on cross-correlation with results obtained using classical FFT. The presented non-Fourier method is achieved by correlating ...
Two-dimensional correlation is equivalent to two-dimensional convolution with the filter matrix rotated 180 degrees. 卷积计算中要把卷积核翻转180°,但在图像中大部分卷积核都是对称的,所以有些书籍和文章直接表示一致。 卷积计算--矩阵相乘 对于大的卷积核, 加速方法一般是使用傅里叶变换(或者其加强版: 快速...
Summary: This pull request introduces the implementation of fast convolution and cross-correlation methods using FFT (Fast Fourier Transform). It includes: Implementation of fastConvolve and fastC...
Cross Correlation AutoCorrelation--2D Pattern Identification Written byPaul Bourke August 1996 Cross correlation is a standard method of estimating the degree to which two series are correlated. Consider two series x(i) and y(i) where i=0,1,2...N-1. The cross correlation r at delay d is...
1.A cross correlation algorithm based on Fast Fourier Transform (FFT) for Digital Particle Image Velocimetry (DPIV) is discussed thoroughly in this paper.详细研究了基于快速傅立叶变换(FFT)的数字粒子图象测速技术(DPIV)的互相关算法。 2.Based on comparing characteristics of some improved cross correlatio...
aThe discrete cross correlation in Eq. (6) can be calculated exactly with high computational efficiency by means of three applications of the FFT by using sequences of 2N values and choosing for N a power of 2. 分离互相关在Eq。 (6)能确切地计算以高计算效率通过FFT的三种应用通过使用2N价值序...
With this procedure all the image points are used to compute the upsampled cross-correlation in a very small neighborhood around its peak. This algorithm is referred to as the single-step DFT algorithm in [1]. [1] Manuel Guizar-Sicairos, Samuel T. Thurman, and James R. Fienup, ...
Fast Quadtree Based Normalized Cross Correlation Method for Fractal Video Compression using FFT In order to achieve fast computational speed with good visual quality of output video, we propose a frequency domain based new fractal video compression sc... RE Chaudhari,SB Dhok - 《Journal of Electrica...