Alex

Actif depuis 2013

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Professional Interests: Photography

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How to pass extra parameters to multistart?
the simple solution was to declare those variables inside the function

plus de 10 ans il y a | 0

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How to pass extra parameters to multistart?
I was able to optimize a local solver with a few extra parameters after *options (pulse_method, etc.)* as follows: options ...

plus de 10 ans il y a | 1 réponse | 0

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How to fit multiple 2D surfaces to the same equation?
I have a few 2D maps (attached .mat files from MRI data) obtained at different energies (B1 in uT: 0.5, 1.0, 1.5 and 2.0). The h...

plus de 11 ans il y a | 1 réponse | 0

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How to turn this for loop into a matrix?
My code spends a significant amount of time in for loop. Could you, please, help to convert this for loop to a matrix operation?...

plus de 11 ans il y a | 1 réponse | 0

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Which loop to run in parallel if I have three of them?
Assuming I have a code like this: for ii=1:51 do something for jj=1:100 do something ...

plus de 11 ans il y a | 1 réponse | 0

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How to pass a linear dependence between some parameters into MATLAB non linear solver?
I am fitting a multiparametric model based on a set of differential equations to the experimental data. I have initial guesse...

plus de 11 ans il y a | 1 réponse | 0

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fitting a model to correlated data
Trying to fit a model (bloch equations from MRI) to experimental data (12 parameters, 12 equation). Monte Carlo Multistart ('lsq...

presque 12 ans il y a | 1 réponse | 0

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Cannot segment an image of brain into white and grey matter
My aim is to extract both white and grey matter from the image ( <http://imgur.com/6Zd04W1>). <<http://i.imgur.com/6Zd04W1....

presque 12 ans il y a | 1 réponse | 0

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how to start script from Linux command line?
Is it possible to arrange somehow that I just type in script.m path/name in Linux command line and the script.m starts MATLAB an...

plus de 12 ans il y a | 1 réponse | 0

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How to extract information from h5disp?
Could someone please, advise as to how to extract information in the form of *string* from the h5disp? Intuitively, I was tryin...

plus de 12 ans il y a | 1 réponse | 0

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txt looks normal on Linux but weird on Windows. WHY?
I created txt. file using fopen, fwrite and fclose running MATLAB on Linux. However, the lines are mixed up when opening the fil...

plus de 12 ans il y a | 2 réponses | 0

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how to track beam light motion in X-ray microscope?
In X-ray microscopy we acquire several frames at each X-ray energy point and merge them together with an aim to improving signal...

plus de 12 ans il y a | 1 réponse | 0

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how to put several parts together in a call to function using file path and file name?
This way everything seems to work because file dftregistration.m is in the current MATLAB directory [outputGreg]=dftregistra...

plus de 12 ans il y a | 1 réponse | 0

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looking for an alternative to ginput(n) to select a region on an image
Is there any built in function allowing to select a region on an image (interactively like in ginput) resulting in printing out ...

plus de 12 ans il y a | 2 réponses | 0

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please, give some advice on law of signal/noise propagation in image processing
Is is possible to determine *experimentally* how signal and noise change when one adds two or more images together (gray scale f...

plus de 12 ans il y a | 1 réponse | 0

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How to calculate histogram width at the half-height?
What is the easiest way to calculate histogram width at the half-height? I was unable to find any information about that in the ...

plus de 12 ans il y a | 1 réponse | 0

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how to fuse two images of different intensity?
I am trying to overlay one image (foreground, false color image containing information about signal to noise ratio, intensity ra...

plus de 12 ans il y a | 1 réponse | 0

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How to merge several gray scale images to increase signal to noise ratio?
Images from X-ray microscope were realigned and have the same resolution. I am trying to come up with a code for intensity image...

plus de 12 ans il y a | 1 réponse | 0

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struggling with shifting an image using non-integer offset
I am not sure I understand the fact that the image's resolution 1500x2000 (integer values) pixels and offset_X = -3.0314 and off...

plus de 12 ans il y a | 1 réponse | 0

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how to correct a stack of images taking into account vector of offsets?
I have a stack of images (200 images) and two vectors with offsets for rows and columns of each image. Is there any time efficie...

plus de 12 ans il y a | 1 réponse | 0

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tracking correlation coefficient (linear and non-linear) between two images
When I apply corr2 to two similar images (delay between two consecutive images of 1s) it gives correlation coef. close to 0.99 b...

plus de 12 ans il y a | 1 réponse | 0

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how to open a stack of images (unsupported format) in MATLAB ?
Is it hard to write a script to open a stack of images with unsupported format in MATLAB? I have a stack of images (file.h5) and...

plus de 12 ans il y a | 1 réponse | 0

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any ideas how to make the code more efficient? Now it takes a few days!
I have 200 images and I am trying to calculate Signal to Noise ratio at each pixel following the formula SNR at each pixel = ...

plus de 12 ans il y a | 2 réponses | 0

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-log(SNR) does it make any difference?
Dear All, please, let me know if you know what happens to Signal to Noise ratio (SNR) of an image after we take -log(SNR)?...

plus de 12 ans il y a | 1 réponse | 0

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how to plot a symbolic equation with 4 variables?
Does anyone know how to plot a symbolic equation containing 4 variables? u=f(x,y,z) using colour as the fourth dimension for u? ...

plus de 12 ans il y a | 1 réponse | 0

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image division/normalization - consequences for Signal to Noise ratio
I know that if one subtracts one image from another one then noise is additive and signal of one image is subtracted from that o...

plus de 12 ans il y a | 1 réponse | 0

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