extract punctuation from arabic characters images

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Hi guys i have three images of three arabic characters . I need a method in C# to extract small part of the whole image, this part known as the punctuation of the character as shown below.
the tree characters are :
ج ظ ك
extract the secondary component (.) of the character from the main body of the character (ح).
ج ------> . ح
where this character is image saved in (.jpg,... etc ).

Posted 4-Jul-12 8:16am

Moh'd A.Hafed

Updated 4-Jul-12 8:38am

v3

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Sergey Alexandrovich Kryukov 4-Jul-12 14:43pm

This is called OCR, Optical Character Recognition. Do you have any idea how difficult is it? How come you end up with the images instead of text in first place? Maybe you can find some ready-to-use OCR capable of working with Arabic...
--SA

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YvesDaoust · Accepted Answer · 2012-07-24T02:22:00

You can resort to connected components labeling.

This means that you detect sets of black pixels that touch each other by a side (optionally by a corner). The size of the set (number of pixels) will tell characters from punctuation.

You should find suitable connected components labeling algorithms on the web (http://en.wikipedia.org/wiki/Connected-component_labeling[^]). You can also search for a ready made image processing library in C# that features it.

I can also recommend a less classical approach based on flood filling: scan the image top-down and left-right until you hit a black pixel; from this pixel, use a flood filling algorithm to paint it white (http://en.wikipedia.org/wiki/Flood_fill[^]). While you are filling, count the pixels. Continue the scan from the pixel hit. In the end, you'll get a wholly white image but you'll have seen every connected component once.