Eroding Text to from blobs

erode

asked 2014-03-23 22:30:01 -0600

Luek
127 ●4 ●6 ●13

I need to detect text blocks on a document and get back their bounding boxes, I have heard that I should erode the image which will "smudge" the text together and form blobs, then I can use blob detection to find where the text is. Currently I have I binarized image with some text on it.

I have been using this code to erode, and it is slightly merging the text together. But how can I make it more severe? The parameters have me slightly confused and if someone could explain how I could make the erosion harsher that would be great!

erode(quad, quad, Mat(), cv::Point(-1, -1), 2, 1, 1);

Thanks.

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answered 2014-03-24 01:52:53 -0600

Martin Peris
1742 ●10 ●23 http://blog.martinperi...

Hi Luek,

By using Mat() as the third argument on erode you are using de default 3x3 structuring element, which might be too small for your case. You should experiment with larger sizes/different shapes of structuring element until you achieve satisfying results..

You can try something like this:

int size = 6; //Play with this size until you get the results you want
erode ( quad, quad, cv::getStructuringElement ( MORPH_RECT, size ), cv::Point ( -1, -1 ), 2, 1 , 1);