How to enclose a line using regionprops and rectangle function

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

Answer 1

[Image Analyst]

A simplistic way (probably too simplistic):

1. Threshold: binaryImage = grayImage < 128;
2. call imclose to connect nearby letters: binaryImage = imclose(binaryImage, true(7));
3. call regionprops and ask for BoundingBox measurements = regionprops(binaryImage, 'BoundingBox');
4. 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).