mmdlabeltext - Segmenting letters, words and paragraphs.

Description

In this example, a digitized text is processed to identify the letters, words and paragraphs. This demonstration uses only the mmlabel function with different connectivity parameters.

See Also

mmlabel - Label a binary image.

Reading

The text image is read.

f = mmreadgray('stext.tif'); mmshow(f); (f)

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); (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); (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); (fp)

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