How to mask numbering inside rectangular ROI

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Levente Gellért
Levente Gellért 2023-3-9
评论： Image Analyst 2023-3-14
Dear MAtlab Community, while reading some matlab release notes, I have found the attached image.
Could someone explain to me what is the easy way to achive some image like that (actually I want to have numbering in rectangular ROIs)
Thanks for sharing your ideas!
BEst
lg

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回答（3 个）

Cameron
Cameron 2023-3-9
This shows the value as a label instead of in the middle.
imshow(imread('peacock.jpg'))
prompt = {'Enter ROI label:'};
dlgtitle = 'Input';
dims = [1 45];
definput = {''};
answer = ' ';
while ~isempty(answer)
answer = inputdlg(prompt,dlgtitle,dims,definput);
if ~isempty(answer)
r1 = drawrectangle('Label',string(answer));
end
end
Image Analyst
Image Analyst 2023-3-10
I don't know what you mean by "archive". Maybe try imwrite or exportgraphics.
If you want to display circles without a label, then call viscircles.
  2 个评论
Levente Gellért
Levente Gellért 2023-3-10
Dear Image Analyst, sorry, I do not understand your reply. Maybe you misuderstood my word achieve?
Best
lg
Image Analyst
Image Analyst 2023-3-10
@Levente Gellért Oh right. You had "achive" (not a word because of the missing letter) and I thought it meant "archive" while you meant "achieve".
It looks like your image used drawellipse. Please see my attached drawing demos. You can adapt one of them to get your image with the circle and handles (for resizing it) on it:
See my Image Segmentation Tutorial in my File Exchange:
Image Analyst's File Exchange
It's a generic, general purpose demo of how to threshold an image to find blobs, and then measure things about the blobs, and extract certain blobs based on their areas or diameters.

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Levente Gellért
Levente Gellért 2023-3-14
Dear Commenters, In the meantime I have found the most easy solution, hence, the 'text' function. That is what I needed. Thanks for your ideas!
lg
  1 个评论
Image Analyst
Image Analyst 2023-3-14
It would have been easier for us to answer had you said that you just wanted the text instead of a circle with handles to adjust the size of the circle. But anyway, glad that you found text works for you. If you have the Computer Vision Toolbox you can also use insertText which will burn the text into the image pixels, instead of text which puts text into the graphical overlay above the image.

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