How to enclose a line using regionprops and rectangle function

Question

suvendra sahoo 2014-1-8

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https://ww2.mathworks.cn/matlabcentral/answers/111713-how-to-enclose-a-line-using-regionprops-and-rectangle-function

回答： Image Analyst 2014-1-8

Dear Image analyst,

I am having two english text lines. I want to enclose individual lines in a rectangle with red color. Can you tell me how can i do this using regionprops and rectangle function.

Waiting for your reply

Suvendra

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Answer 1

Image Analyst 2014-1-8

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https://ww2.mathworks.cn/matlabcentral/answers/111713-how-to-enclose-a-line-using-regionprops-and-rectangle-function#answer_120291

A simplistic way (probably too simplistic):

Threshold: binaryImage = grayImage < 128;
call imclose to connect nearby letters: binaryImage = imclose(binaryImage, true(7));
call regionprops and ask for BoundingBox measurements = regionprops(binaryImage, 'BoundingBox');
call rectangle() or plot() to draw the box.

Give it a shot. Come back if you can't figure out that algorithm (though I've given 3 out of 4 lines of it so it should be easy to finish the rest of it).