how to run a code regarding regionfill() to obtain the background of an image in matlab 2014 because it is giving error that Undefined function 'regionfill' for input arguments of type 'uint8'.

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Debarpita Chaudhuri 2015-9-9

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https://ww2.mathworks.cn/matlabcentral/answers/241403-how-to-run-a-code-regarding-regionfill-to-obtain-the-background-of-an-image-in-matlab-2014-because

评论： Walter Roberson 2015-9-22

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brain_tumor.png

在 MATLAB Online 中打开

I am giving the code here.

grayImage = imread('brain_tumor.png');
figure,imshow(grayImage);
%h = impoly;
%position = wait(h);
mask = roipoly(grayImage);
figure, imshow(mask);
BackGround = regionfill(grayImage, mask);
figure, imshow(BackGround);

Sir, I have also attached the image herewith.

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Walter Roberson 2015-9-9

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https://ww2.mathworks.cn/matlabcentral/answers/241403-how-to-run-a-code-regarding-regionfill-to-obtain-the-background-of-an-image-in-matlab-2014-because#answer_191756

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regionfill requires the Image Processing Toolbox, R2015a or newer.

Change your code

BackGround = regionfill(grayImage, mask);

BackGround = grayImage;
BackGround(mask) = 0;

with no regionfill() call.

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Debarpita Chaudhuri 2015-9-22

编辑：Debarpita Chaudhuri 2015-9-22

在 MATLAB Online 中打开

Sir, I have got a program online for the operation which I need. However it is working only on .bmp images. Is there any way you can help me to make the program work on .jpg, .png or dicom images. Sir, I would also like to know is there any other simpler code for the same operation. Thank you Sir for your cooperation so far. The program is given below.

if true%--------------------------------------------------------------------------
                    %%%charge et lecture de l'image %%%
%--------------------------------------------------------------------------                
[filename, pathname] = uigetfile('brain_tumor.bmp', 'open image');% only image Bitmap
if isequal(filename, 0) || isequal(pathname, 0)   
  disp('Image input canceled.');  
 X = [];    map = []; 
else
  [X,MAP]=imread(fullfile(pathname, filename));%Lecture d'image.
end;
lsz=length(size(X));
if lsz==3
X=rgb2gray(X);
end
%---------------------------------------------------------------------------------------------------
%%%Region of interest extraction ( Extraction d'une région d'intéret à main libre )by free hand %%%
%---------------------------------------------------------------------------------------------------
im0=X;
X=double(X);
h_im = imshow(im0),title('Choose ROI from the figure');
%helpdlg('Choose ROI from the figure','Point Selection');
h = imfreehand;
position = wait(h);
e = impoly(gca,position);
BW = createMask(e,h_im);
ROI=X.*BW;
figure,imshow(ROI,[]);
im_DIF=X-ROI;
X=X-ROI;
figure,imshow(im_DIF,[]);
ROI=uint8(ROI);im_DIF=uint8(im_DIF);
imwrite(ROI,'Region of interest.bmp','bmp');
imwrite(im_DIF,'Image difference.bmp','bmp');
  % code
end

Sir, I have attached the images herewith. Kindly help me Sir.

Walter Roberson 2015-9-22

Jpeg images should seldom be used for this kind of work. Jpeg blurs sharp edges making edge detection more difficult.

Walter Roberson 2015-9-22

That code prompts for the image to open. You can select any of a number of image file formats including jpeg and png. Jpeg just won't do a good job.

Dicom would require a few more lines to read in.

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how to run a code regarding regionfill() to obtain the background of an image in matlab 2014 because it is giving error that Undefined function 'regionfill' for input arguments of type 'uint8'.

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how to run a code regarding regionfill() to obtain the background of an image in matlab 2014 because it is giving error that Undefined function 'regionfill' for input arguments of type 'uint8'.

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