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Same as last post www.flickr.com/photos/kylemcdonald/4309938058 but using an alternative method for FFT frequency estimation, described here www.dspguru.com/dsp/howtos/how-to-interpolate-fft-peak
Unfortunately it's still really wavy (see bottom right). I didn't expect that recovering a single frequency would be so difficult. Maybe another technique, like autocorrelation, should be used instead in cases where non-transparent materials are being scanned?
paddedAmplitude = [zeros(1, w); amplitude; zeros(1, w)];
[maxVal, maxInd] = max(paddedAmplitude);
ph = size(paddedAmplitude, 1);
pw = size(paddedAmplitude, 2);
y1 = paddedAmplitude(maxInd - 1 + ph * ((1:pw) - 1));
y2 = maxVal;
y3 = paddedAmplitude(maxInd + 1 + ph * ((1:pw) - 1));
binOffset = (y3 - y1) ./ (2 * (2 * y2 - y1 - y3));
subplot(2, 2, 4);
plot(maxInd + binOffset - 1);
axis square;
axis tight;
xlabel('Position');
ylabel('Quadratic Method Center');
"University of Texas at Austin"
"University of Texas School of Architecture"
"UT Austin"
"UTSOA"
"Additive Manufacturing"
"Matlab"
"Materials Lab"
"Student works"
"Spring 2014"
HIGS is the best MATLAB Project Center in Chennai, Bangalore, Coimbatore. Our PhD MATLAB team Guide you to complete your research MATLAB implementation on time
Curated by Kuth/Ranieri (Byron Kuth, Elizabeth Ranieri, Juta Cinco, Eliza Koshland) and UTSOA (Sydney Mainster, Charlton Lewis, Travis Cook, Jen Wong, Rachel Bullock, Dan Zou, Lana Denkeler, Mehreen Charania, Eric Lam, James Spence).
Photographed by Selina Ortiz, School of Architecture Visual Resources Collection Photography TA
Working towards arbitrarily high precision structured light scanning. Plots are with 4, 8, 16, and 32 bins.
Why does the spectral center (weighted average bin) "hum" as you do a frequency sweep?
Update: it "hums" because the spectral center is one of the worst ways to do frequency estimation! web.archive.org/web/20071011064215/http://home.comcast.ne...
w = 512;
timeSteps = 64;
img = repmat(1:w, timeSteps, 1) / w;
img = img .* repmat((1:timeSteps)', 1, w);
img = cos(img * pi);
subplot(1, 3, 1);
image(img * 256);
xlabel('Position');
ylabel('Time');
colormap(gray(256));
axis square;
fftOut = fft(img);
goodBins = (timeSteps / 2) + 1;
amplitude = abs(fftOut((1:goodBins), :)) / timeSteps;
subplot(1, 3, 2);
image(amplitude * 256);
axis square;
xlabel('Position');
ylabel('FFT bin amplitude');
weightedSum = sum(repmat((1:goodBins)', 1, w) .* amplitude);
weightedAverage = weightedSum ./ (sum(amplitude) * timeSteps / 2);
subplot(1, 3, 3);
plot(weightedAverage);
axis square;
axis tight;
xlabel('Position');
ylabel('Spectral Center');
The ambassador visited the hospital located inside the Matlab Health Research Centre where he spent some time touring the diarrhoea, and maternal and child health wards.
Norwegian Ambassador HE Ms Sidsel Bleken and Norwegian Institute of Public Health officials visited Matlab Health Research Centre to learn more about Hepatitis E Vaccine HEV study led by icddr,b senior scientist Dr K Zaman, and different maternal and child health services and Matlab hospital. The visitors also went to the field to see how community health research workers are engaged in routine HDSS data collection in the villages. Photos: Rabiul Hasan
Scherk's surface is defined by exp(z)cos(x)-cos(y)=0. If z is treated as a complex number rather than a real and multiplied by exp(it) the solution to Re(exp(z)cos(x)-cos(y))=0 performs this curious dance act. The color denotes the imaginary part.
This set works nicely as a slideshow.
Rendered in Matlab using isosurfaces.
Black bars drawn recursively on a grid.
Although I often create images like this in Processing, I made this one in Matlab.
El jueves 17 de octubre, de 10 a 13.30 horas, en la Escuela de Ingeniería de Telecomunicación y Electrónica de la ULPGC, se va a celebrar un Seminario de Matlab, a cargo de Loren Shure, coautora de varios productos de MathWorks donde ha trabajado en los últimos 30 años.
Más información: www.ulpgc.es/noticia/seminario-matlab-cargo-loren-shure-c...
9. September 2017: Damit die Software Matlab die Messdaten dem jeweiligen Rad zuordnen kann, wird der Messbox die Radnummer zugeordnet.
Zum Artikel: extraenergy.org/main.php?language=de&category=product...
Foto: Angela Budde, www.ExtraEnergy.org
summer training institute for engineering students in Lucknow on JAVA, Embedded System, .NET, MATLAB. PLC SCADA, Industrial Automation, VLSI Design, CATIA, ANSYS, AutoCAD, Solidworks, Staad Pro at iNext Technology
SONY A580 broadband
DT 3.5-5.6/18-55 SAM II; 18mm @ f/11
Tiffen Yellow 15 filter
Single image IRG composition with Matlab
Matlab Upazila, Chandpur District, Bangladesh.
Photo credit: Rob Hope/REACH
If you use one of our photos, please credit it accordingly and let us know. You can reach us via Flickr or at reach@water.ox.ac.uk
Norwegian Ambassador HE Ms Sidsel Bleken and Norwegian Institute of Public Health officials visited Matlab Health Research Centre to learn more about Hepatitis E Vaccine HEV study led by icddr,b senior scientist Dr K Zaman, and different maternal and child health services and Matlab hospital. The visitors also went to the field to see how community health research workers are engaged in routine HDSS data collection in the villages. Photos: Rabiul Hasan
Scherk's surface is defined by exp(z)cos(x)-cos(y)=0. If z is treated as a complex number rather than a real and multiplied by exp(it) the solution to Re(exp(z)cos(x)-cos(y))=0 performs this curious dance act. The color denotes the imaginary part.
This set works nicely as a slideshow.
Rendered in Matlab using isosurfaces.
El jueves 17 de octubre, de 10 a 13.30 horas, en la Escuela de Ingeniería de Telecomunicación y Electrónica de la ULPGC, se va a celebrar un Seminario de Matlab, a cargo de Loren Shure, coautora de varios productos de MathWorks donde ha trabajado en los últimos 30 años.
Más información: www.ulpgc.es/noticia/seminario-matlab-cargo-loren-shure-c...
Country boats wade through water hyacinths in Matlab Upazila, Chandpur District
Photo credit: Rob Hope/REACH
If you use one of our photos, please credit it accordingly and let us know. You can reach us via Flickr or at reach@water.ox.ac.uk
Scherk's surface is defined by exp(z)cos(x)-cos(y)=0. If z is treated as a complex number rather than a real and multiplied by exp(it) the solution to Re(exp(z)cos(x)-cos(y))=0 performs this curious dance act. The color denotes the imaginary part.
This set works nicely as a slideshow.
Rendered in Matlab using isosurfaces.
Same photo as
www.flickr.com/photos/thomasfournier/243248064
but reprocessed by some homemade effects that I tried to implement with Matlab and that works surprinsingly good. If you're interested in these effects (it basically increases the contrast), please contact me...
"University of Texas at Austin"
"University of Texas School of Architecture"
"UT Austin"
"UTSOA"
"Additive Manufacturing"
"Matlab"
"Materials Lab"
"Student works"
"Spring 2014"
"University of Texas at Austin"
"University of Texas School of Architecture"
"UT Austin"
"UTSOA"
"Additive Manufacturing"
"Matlab"
"Materials Lab"
"Student works"
"Spring 2014"
I call my newest invention "The Smile-O-Tron 5k".
And here is what you do: Train you system (eigenfaces) on smiling people, then take an image with serious faces, find them, project them into face space and back, and tadaa: They are smiling! Happy days!
Below you can see the reconstruction error near the actual faces.
"University of Texas at Austin"
"University of Texas School of Architecture"
"UT Austin"
"UTSOA"
"Additive Manufacturing"
"Matlab"
"Materials Lab"
"Student works"
"Spring 2014"
Mit dieser Funktion wird häufig für die Leistungsfähigkeit von MatLab geworben. Das jedem Macintosh beiliegende, kostenlose Visualisierungstool Grapher kann sie — wie man sieht — aber auch sehr nett darstellen.