cvBlob and cvBlobLib in openCV

Question

I want to extract the white area of my binary image. Everywhere I check on the internet, I see stuff about cvBlob and cvBlobLib. I don't really know what these are since I am just working with openCV and C++. Do I need to install those extra things to extract the white area from my binary image. The white area is a person walking.

Horizon1710 · Accepted Answer · 2020-08-13 13:30:41Z

5

Cvblob would be better choice over others with its power on blob detecting and tracking, but there isn't enough documentation and tutorials.

edited Aug 13, 2020 at 13:30

answered Jul 11, 2012 at 0:27

Horizon1710

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Adrien BARRAL · Accepted Answer · 2012-02-21 08:15:37Z

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cvBlob is an "add-on" to OpenCV. If you want to extract contigous white area of your binary (thresholded) image, please have a look at the contours2.cpp example wich is provided with OpenCV. You can find it in OpenCV-2.3.1/samples/cpp/contours2.cpp

This file will show you how to find "blobs" in a thresholded image thanks to the OpenCV built in function cvFindContour.

I never try cvBlob, may be this library works better than cvFindContour, but it is very easy to try cvFindContour thanks to the sample "contours2.cpp"

answered Feb 21, 2012 at 8:15

Adrien BARRAL

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sue-ling Over a year ago

thanks a lot. I'll try it and see because I'm a bit uncertain as to using cvBlobs. stackoverflow.com/questions/9372687/… this is the question for which i was asking about the cvBlobs. can you take a look and see if cvFindContour will work as well? please do, I need help urgently

Adrien BARRAL Over a year ago

Yes I think cvFindContour will help you to extract the human contour. Some times it is necessary to do a little morphological dilatation of the thresholded image to get the full contour.

Mzk · Accepted Answer · 2012-05-07 06:00:08Z

1

I have try to use cvBlob but seems it's not working for me. then, i choose cvBlobsLib instead. This link http://opencv.willowgarage.com/wiki/cvBlobsLib might help you. If you want to find the white pixel area, use CCL analysis. It will search for all the white blobs in the image. Use some criteria to eliminate the blobs that you might not want.

answered May 7, 2012 at 6:00

Mzk

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plan9assembler · Accepted Answer · 2012-02-25 14:37:39Z

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cvblob is much better than cvFindContour(hard) or cvBlobLib(outdated).

answered Feb 25, 2012 at 14:37

plan9assembler

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sue-ling Over a year ago

But, I would have to install a whole new library, whereas I already have the OpenCV on my machine. Would region of interest be suitable to obtain the largest white area of my image?

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