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Submitted
Radially averaged surface roughness power spectrum (PSD) only on top or bottom part of a topography
Calculates radially averaged 2D power spectrum for a certain part of surface topography
nästan 9 år ago | 6 downloads |
Submitted
1-dimensional surface roughness power spectrum of a profile or topography
Calculates 1D surface roughness power spectrum for a surface topography/or multiple line profiles
nästan 9 år ago | 8 downloads |
Submitted
Radially averaged surface roughness/topography power spectrum (PSD)
Calculates radially averaged 2D power spectrum for a surface roughness/topography
nästan 9 år ago | 8 downloads |
Random Gaussian Surface Generation
Hei Michelle, although it is already late for you, but maybe this could help someone else. Now, you can easily use below code to...
nästan 9 år ago | 2
Submitted
Surface generator: artificial randomly rough surfaces
Generates randomly rough fractal surfaces with different fractal (Hurst) parameters
nästan 9 år ago | 12 downloads |
Why am i getting huge values on low frequencies of my PSD ?
Hello, We don't know what you expect to see in your power spectrum. You just mentioned you see some weird high peaks in your...
nästan 10 år ago | 0
How to calculate the Power spectral denstity(PSD) function for rough surface from surface profile z(x,y)? i wanted to plot log C(q) vs log (q). Can anybody help me to calculate the PSD For rough surface?
Hello, Probably a little bit late to answer but use below codes for the exact same purposes: For 2D PSD: <http://se.mat...
nästan 10 år ago | 4
IFFT of a Hanning windowed FFT Image
Hello, You have used your absolute values to plot your image. Now, to reverse the operation you need the full fft results whi...
nästan 10 år ago | 0
| accepted
How can I get this pattern?
Dear Xaris, I took a look at the standard. First of all, the definition of velocity and acceleration PSD in the standard is d...
nästan 10 år ago | 5
| accepted
Fourier Transform - position to velocity derivative
Hello, Your problem when assigning frequencies to fft results is only related to the shift of frequencies. The frequencies wh...
nästan 10 år ago | 0
| accepted
Question
nonlinear curve fit: how to optimize?
I have a custom model which I want to fit to my data. The model works manually, i.e. when I know approximately the fit paramater...
ungefär 10 år ago | 1 answer | 0
1
answerideas to smooth a sharpe corner of a graph?
Thanks a lot for all your ideas, I really appreciate them. I finally used curve fitting in MATLAB using pchip interpolation in 1...
mer än 10 år ago | 0
Question
Design filter to pass high frequencies but reduce amplitudes for low frequencies to half (not zero)
I don't have experience in filter design. Could anyone tell me the possibility, limitations as well as MATLAB commands to design...
mer än 10 år ago | 1 answer | 0
1
answerQuestion
ideas to smooth a sharpe corner of a graph?
I'm trying to smooth a sharpe corner of a graph similar to what I've shown in the image below: <</matlabcentral/answers/upl...
mer än 10 år ago | 4 answers | 0
4
answersMake ifft2 to give real output
I found my answer, so maybe useful for someone else as well. I need to apply conjugate symmetry condition for 2D fourier transf...
mer än 10 år ago | 1
| accepted
Question
Make ifft2 to give real output
I'm trying to generate a randomly rough surface(isotropic surface). Suppose I have the absolute values of fourier components of ...
mer än 10 år ago | 2 answers | 1
2
answersQuestion
2D butterworth filter on a surface
Hello, I need to apply lowpass/highpass filters on a surface topography. What I have in mind is to filter data from a cut-off...
mer än 10 år ago | 0 answers | 0
0
answersQuestion
Error estimation during converting point cloud to STL file
I have a 3D point cloud of a topography and I convert it to STL file format by means of this function in MATLAB: <http://www....
nästan 11 år ago | 0 answers | 0
0
answersQuestion
image stitching: ideas to solve singular or badly scaled matrix
I'm trying to do image mosaicing according to this example of MATLAB: <http://se.mathworks.com/help/vision/examples/feature-b...
nästan 11 år ago | 1 answer | 1
1
answerQuestion
Problem in exporting figure: Can anyone fix a bug in this code?
Dear all, I'm using this code to magnify part of my figure: <http://www.mathworks.com/matlabcentral/fileexchange/26007-on-...
nästan 12 år ago | 7 answers | 0
7
answersProblem in exporting figure: Can anyone fix a bug in this code?
Dear all, I was checking the original code again and I saw this statement in it as known issues: % - The size and posi...
nästan 12 år ago | 0
Problem in exporting figure: Can anyone fix a bug in this code?
Jan, Thanks for your answer, unfortunately, I don't know how to debug the original code! But for the other questions you asked I...
nästan 12 år ago | 0
Question
What are low frequencies in an image while they don't exist in reality?
I'm really frustrated by these frequency components and their assignments. I have images(3D profiles) which are height profiles ...
ungefär 12 år ago | 1 answer | 0
1
answerHow many periods it is needed for fft to give us a proper estimate over frequency?
Dear Wayne, Thanks a lot for your answer. I played with Fs a little bit and even for Fs = 10(twice the highest frequency), it...
ungefär 12 år ago | 0
Question
How many periods it is needed for fft to give us a proper estimate over frequency?
Dear all, I have a basic question. Imagine a simple sinusoidal defined as below: Fs = 150; t = 0:1/Fs:0.2; f = 5; ...
ungefär 12 år ago | 2 answers | 0
2
answersQuestion
Error using arrayfun : Non scalar in Uniform output
Hello, I have a cell array (Z) of size (480*1) where in each row I have the individual double arrays that I want(e.g. 1*70 do...
ungefär 12 år ago | 1 answer | 0
1
answerQuestion
Grouping continuous nonzero in a row vector
Dear All, Is there any MATLAB function to ease grouping continuous nonzero elements of a row vector? I will explain further i...
ungefär 12 år ago | 4 answers | 0
4
answersExtracting Spatial frequency from fourier transform (fft2 on Images)
qx_1=zeros(m,1); for k=0:m-1 qx_1(k+1)=(2*pi/m)*(k); end qx_2 = fftshift(qx_1); % for removing discontinuity...
ungefär 12 år ago | 1
Extracting Spatial frequency from fourier transform (fft2 on Images)
If I get it right, you need a 2D graph of power spectral density versus frequencies. When you do a 2D fft on an image, you get a...
ungefär 12 år ago | 1
How to fit a curve to a power spectrum curve which follows power law
Hi, Go to cftool, then select your data and choose power; set number of terms to '1' if it follows this equation: y = a*x^b ...
mer än 12 år ago | 0
