Jonas Reber

Last seen: 2 månader ago

36 total contributions since 2011

PhD

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Pizza!
Given a circular pizza with radius _z_ and thickness _a_, return the pizza's volume. [ _z_ is first input argument.] Non-scor...

2 månader ago

Question

Matlab exponent bug?
Hello MatLabers I have encountered a problem when calculating a non integer exponent/power of a variable. example: ...

mer än 9 år ago | 2 answers | 1

2

answers

Answered
eigen faces
Eigenfaces are eigenvectors. When performing principal component analysis (PCA) on a set of images showing human faces, the pri...

mer än 9 år ago | 0

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Answered
when using copyobj() with a contour, changing properties of the copy has no effect
mathworks technical support confirmed that this is a misbehaviour and that it will be resolved in a future version.

mer än 9 år ago | 0

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Calling another program
you might be looking for system('command') [status, result] = system('command') [status,result] = system('command','-...

mer än 9 år ago | 0

Answered
Assigning data to variable names in a vector during a for loop.
yes this is possible. you could use the command "eval" that comes with matlab. have a look at the documentation. for your c...

mer än 9 år ago | 1

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how to use fread function?
have a look at the documentation of fread: http://www.mathworks.ch/help/techdoc/ref/fread.html you might be looking for: ...

mer än 9 år ago | 0

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How to save an image displayed ?
have a look at the solution I provided in your second question. it should answer both: http://www.mathworks.com/matlabcentral/a...

mer än 9 år ago | 0

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How to recostruct ROI on an image and diaplay it?
after having read your first question ( <http://www.mathworks.com/matlabcentral/answers/18789-how-to-save-an-image-displayed>) I...

mer än 9 år ago | 1

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Update to R2011b breaks call to addlistener
does the event exist on the "figureHandle"? get(get(classhandle(handle(figureHandle)),'Events'),'Name') what if you tr...

mer än 9 år ago | 0

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size of image
how did you store your images? is it a 2d matrix? did you store it like: (N images of size 3 by 4) 1 1 1 1 1 1 1 1 1 1 1 1...

mer än 9 år ago | 0

Question

when using copyobj() with a contour, changing properties of the copy has no effect
Hello MatLabers I'm using a contour plot on several axes. Since I have quite an amount of points, the calculation of the cont...

mer än 9 år ago | 1 answer | 0

1

answer

Question

Multiple Callback Functions
Hello MatLabers I'm trying to have multiple callback functions executed on a uicontrol callback function. Usually I go so...

mer än 9 år ago | 5 answers | 1

5

answers

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Competing algorithms for SNR of a image. Which is better?
I would go for method 2 (3 is the same?) but wouln't one calculate SNR = mean2(im)/std(im(:))?

mer än 9 år ago | 0

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2D projection in a 3D plot
something similar has just recently been asked: http://www.mathworks.com/matlabcentral/answers/8752-get-projection-image-witho...

mer än 9 år ago | 1

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manipulate pixels in an image
if you don't have it you could take a look at e.g. http://www.mathworks.com/matlabcentral/fileexchange/4658-updownsample

mer än 9 år ago | 0

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Data sets from image
does it help if I provide you the following code as an example...? %% Two Dimensional DFT Example % 1.Load the sample ...

mer än 9 år ago | 1

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Answered
RGB to HSV image
does the rgb2hsv function not work? I do it that way..., hsvimg = rgb2hsv(rgbimg); ... do something ... (like saturat...

mer än 9 år ago | 0

Answered
Image Processing: Remove double edges
you could take another derivative (2nd) and only keep the positive values 1 0 1 => 0 -1 1 (depenting on the direction you are...

mer än 9 år ago | 0

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subscript mismatch
maybe this one answers your question: http://www.mathworks.com/support/tech-notes/1200/1207.html#5 you try to assign/access...

nästan 10 år ago | 0

Question

iptPointerManager significantly slows program down
Hello MatLabers As recently I was looking for a method to have a mouse over (mouse hover) effect on my graphics objects (drag...

nästan 10 år ago | 1 answer | 0

1

answer

Answered
Code's improvement (plots animation)
the problem is that getframe as used by you gets the current figure as it is. If you maximize the window and "record" the movie ...

nästan 10 år ago | 1

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get projection image without rendering to screen
you could calculate the perspective projection of your model yourself as you have all the information on camera position, look a...

nästan 10 år ago | 2

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Answered
Trouble with ButtonDownFcn and Hittest in GUIDE
this looks reasonable to me. have you tried ThePlot = plot(xvalues, yvalues, 'Parent', handles.TheAxes, 'Tag', 'ThePlotTag'...

nästan 10 år ago | 1

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Answered
I can not use libsvm!!!
I used libsvm myself in matlab. * download it from ( <http://www.csie.ntu.edu.tw/~cjlin/libsvm/#download>) * add the svmtrain,...

nästan 10 år ago | 4

Answered
Creating an inline-function in dependence of a parameter
maybe str2func is what you are looking for?

nästan 10 år ago | 0

Question

Contextmenu Callback to set class variable
Hello MatLabers I am looking for a better/smoother way to implement the setting of a class variable in a callback. I'm sure t...

nästan 10 år ago | 1 answer | 0

1

answer

Answered
Seeded Region Growing Method
what about the FE submission: http://www.mathworks.com/matlabcentral/fileexchange/19084 ?

nästan 10 år ago | 1

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detecting circular Objects
have you had a look at: http://www.mathworks.com/matlabcentral/fileexchange/9833-hough-transform-for-circle-detection

nästan 10 år ago | 0

Submitted

Multi ROI/Mask Editor Class
This Class allows you to easily define multiple regions of interest (binary masks) with a nice UI.

nästan 10 år ago | 18 downloads |