How to convert the image into a binary image?

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Manoj Kumar
Manoj Kumar 2014-7-21
评论： Image Analyst 2016-11-11
HI, I have a GUI in which I can select multiple regions of interest for an image. I have selected 3 regions in the image. I tried to get the binary image consisting of 3 regions. But unfortunately, I could get only the last(third) region that i selected.
These are the selected regions of interest in the image one by one using the following code.
global segmentedImage
if(size(segmentedImage,3)==3)
im6=rgb2gray(segmentedImage);
else
im6=imadjust(segmentedImage);
end
hFig=figure;
finalImage = segmentedImage;
finalImage(:,:) = 0;
choice = 1; % =2 represents it is done
while(choice == 1)
% Display the image in Grayscale to draw the contour
figure;imshow(im6);
% Enlarge figure to full screen.
set(gcf, 'units','normalized','outerposition',[0 0 1 1]);
% axis on;
message = sprintf('Draw CONTOUR line.\nLeft click mouse and hold to begin drawing.\nRelease the mouse button to finish');
uiwait(msgbox(message));
hFH = imfreehand();
% Create a binary image ("mask") from the ROI object.
binaryImage2 = hFH.createMask();
subplot(1,2,1);
imshow(im6);
title('Original Image','FontSize',fontSize);
% Get coordinates of the boundary of the freehand drawn region.
structBoundaries = bwboundaries(binaryImage2);
xy=structBoundaries{1}; % Get n by 2 array of x,y coordinates.
x = xy(:, 2); % Columns.
y = xy(:, 1); % Rows.
subplot(1, 2, 1); % Plot over original image.
hold on; % Don't blow away the image.
plot(x, y, 'LineWidth', 2);
drawnow;
% Mask the image using bsxfun() function
maskedImage = bsxfun(@times, im6, cast(binaryImage2, class(im6)));
imgselected = im2uint8(maskedImage);
finalImage = imadd(finalImage,imgselected);
subplot(1,2,2);
imshow(maskedImage);
% axis on;
title('Regions to be included', 'FontSize', fontSize);
promptMessage = sprintf('Do you want to accept this,\nor draw more regions it?');
titleBarCaption = 'Continue?';
button = questdlg(promptMessage, titleBarCaption, 'Accept', 'More', 'Accept');
if strcmpi(button, 'More')
im6=im6-maskedImage;
else
break;
end
close(gcf);
end
close(hFig);
% End addition
%figure;imshow(finalBinaryImage);
axes(handles.axes2);
imshow(finalImage);
This is the binary Image that i got using the following code:
segmentedImageMask=binaryImage-binaryImage2;
Where "binaryImage in the above code" is the binary image of the original image . Here is the attachment of the binary image.
I tried to remove the binary image of the multiple regions(binaryImage2) with the binary image of the original segmented Image(binaryImage). But I couldn't get the appropriate result.
Can you please help me out in getting all the three regions in the binary image.
Thanks...

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采纳的回答

Image Analyst
Image Analyst 2014-7-21
You need to initialize a binary image and then OR in the ones from the loop. Before the loop
finalBinaryImage = false(size(im6));
Then in the loop
finalBinaryImage = finalBinaryImage | binaryImage2;
When the loop is done, finalBinaryImage will have all the regions you drew.
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Image Analyst
Image Analyst 2014-7-21
What image do you want as the final output? A gray image with black holes burned into it? A binary image with all the regions you outlined? Three separate binary images?
Manoj Kumar
Manoj Kumar 2014-7-22
I need a binary image with all the regions outlined...

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更多回答（2 个）

Peyman Obeidy
Peyman Obeidy 2016-11-11
Greeting I am also interested in doing the same things, did you manage to get all your 3 ROIs on the image. If so, may I get the complete code. This will save me a lot of time.
Cheers Peyman
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Walter Roberson
Walter Roberson 2016-11-11
Peyman Obeidy comments to Image Analyst:
were is the start point, I am not use to GUI at all
Image Analyst
Image Analyst 2016-11-11
Peyman, the code is in the original poster's question at the very top. If, some some unreasonable reason, you're unable to use a GUI, then you can't do this at all, because imfreehand() requires a GUI so you can draw on an image.

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Peyman Obeidy
Peyman Obeidy 2016-11-11
Dear Image analyser,
what I would like to do is to a- open an image b- select multiple regions c-display selected region on the original image d- calculate the area of each region
for a-b, I found "Multi ROI/Mask Editor Class (https://au.mathworks.com/matlabcentral/fileexchange/31388-multi-roi-mask-editor-class)" GUI, but I can't get the binary and original image as and output into the workspace.
Maybe I get some help with this, I can manage to do the 'c-d' part by myself.

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