Rank: 1405 based on 110 downloads (last 30 days) and 5 files submitted
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Omer Demirkaya

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Files Posted by Omer Demirkaya View all
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(last 30 days)
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21 Aug 2012 Screenshot Nuclear Medicine Calculator It is a simple decay calculator with most of the nuclear medicine isotopes. Author: Omer Demirkaya physics, pharmaceutical 6 0
30 Apr 2012 Screenshot Extraction of a Volume of Interest (VOI) This is a simple example of extracting a rectangular volume of interest (VOI) from a 3D image Author: Omer Demirkaya region of interest, 3d, volume of interest, voi 25 1
06 Sep 2010 Screenshot image resampling This is a simple function that resamples the image at a different pixel size Author: Omer Demirkaya image processing, function, pixel, resampling 43 6
  • 2.8
2.8 | 5 ratings
18 Aug 2007 Screenshot IMLOOK3D Displays 3D images. Author: Omer Demirkaya gui, display, annotation, image, 3d images, image processing 25 5
  • 3.75
3.8 | 4 ratings
05 May 2004 Screenshot Images with correlated pixels Simulates images with correlated pixels. Author: Omer Demirkaya image generation, image simmulation, random field, correlated pixels 11 4
  • 5.0
5.0 | 1 rating
Comments and Ratings by Omer Demirkaya View all
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13 May 2012 Region Growing (2D/3D grayscale) Recursive region growing algorithm for 2D/3D grayscale images with polygon and binary mask output Author: Daniel

The following two statements should be replaced.
sumSQR = meanI*meanI; % sum of squares

stdI = sqrt((sumSQR - N*meanI*meanI)/(N-1)); % update standard deviation

13 May 2012 Region Growing (2D/3D grayscale) Recursive region growing algorithm for 2D/3D grayscale images with polygon and binary mask output Author: Daniel

Daniel good work.
I have a suggestion about an efficient mean and standard deviation calculations within your while loop.

Here is the inintilization of the parameters outside the loop.

meanI = regVal; % Mean intensity
sumSQR = 0; % sum of squares
stdI = 0; % Standard deviation
N = 1; % number of pixels

And then within your while loop after the statement,

J(xv+i, yv+j, zv+k) = true;

one can add the following lines of code to progessively calculate mean and standard deviation
gI = cIM(xv+i, yv+j, zv+k);
sumSQR = sumSQR + gI*gI;
meanI = (N*meanI + gI)/(N+1); % update mean
N = N+1; % increment number of pixels
stdI = (sumSQR - N*meanI*meanI)/(N-1); % update standard deviation

Omer.

Comments and Ratings on Omer Demirkaya's Files View all
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07 Nov 2013 image resampling This is a simple function that resamples the image at a different pixel size Author: Omer Demirkaya bkshn

Hello
thanks alot for this code, If I have an error in running it, How can I find my answer?

07 Nov 2013 image resampling This is a simple function that resamples the image at a different pixel size Author: Omer Demirkaya bkshn

HEllo
thanks alot for your code,it is useful for me,but I have an error when run it.
Error using griddedInterpolant
Sample values must be a single or double array.

Error in interp2/makegriddedinterp (line 214)
F = griddedInterpolant(varargin{:});

Error in interp2 (line 135)
F = makegriddedinterp(X, Y, V, method,extrap);

Error in imresample (line 49)
nimg(:,:,i) = interp2(Ox,Oy,img(:,:,i),Nx,Ny,intmethod);
Could you help me how can I solve my problem?

20 Sep 2013 Extraction of a Volume of Interest (VOI) This is a simple example of extracting a rectangular volume of interest (VOI) from a 3D image Author: Omer Demirkaya Colleen

I think that this is exactly the function I need; however, when I go to IMTOOL -> ExtractVOI I get the following error:
Undefined function or variable 'img'.
Error while evaluating uimenu Callback

I'm wondering if there is an additional step I need to perform before ExtractVOI. Any insights would be much appreciated!

01 Apr 2013 image resampling This is a simple function that resamples the image at a different pixel size Author: Omer Demirkaya vidyasagar

03 Oct 2011 IMLOOK3D Displays 3D images. Author: Omer Demirkaya Nachiket Tanksale

I am getting two types of errors with two different cases...But I think that the software is nice and helpful. pls let me know a way out of this....

??? Error using ==> imlook3d('readOrdinaryImageSeries_Callback',gcbo,[],guidata(gcbo))
Error using ==> imread at 328
Unable to determine the file format.

??? Error using ==> imlook3d('readSingleDicomImage_Callback',gcbo,[],guidata(gcbo))
Undefined function or method 'keepfield' for input arguments of type 'struct'.

??? Error while evaluating uimenu Callback

Also, pls mention some steps to run the software.

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