Illustrated Source Code
Reading
First, label the letters.
The letters are the main connected components in the image. So we use the classical 8-connectivity criteria for identify each letter.
fl=mmlabel(f,mmsebox);
mmlblshow(fl);
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| fl |
Second, label the words.
The words are made of closed letters. In this case we use a connectivity specified by a rectangle structuring element of 7 pixels high and 11 pixels width, so any two pixels that can be hit by this rectangle, belong to the same connected component. The values 7 and 11 were chosen experimentally and depend on the font size.
sew = mmimg2se(logical(uint8(ones(7,11))));
mmseshow(sew)
ans =
1 1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1 1
fw=mmlabel(f,sew);
mmlblshow(fw);
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| fw |
Finally, label the paragraphs.
Similarly, paragraphs are closed words. In this case the connectivity is given by a rectangle of 35 by 20 pixels.
sep = mmimg2se(logical(uint8(ones(20,35))));
fp=mmlabel(f,sep);
mmlblshow(fp);
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| fp |