cv::findContours finds more than one contour

findContours

asked 2014-06-05 09:33:33 -0600

Beowulf
11 ●4

updated 2014-06-05 10:14:55 -0600

kbarni

4134 ●1 ●13 ●49

I'm trying to find contours in an image, but the cv::findContours finds more than one contour.

cv::findContours(image.clone(), contours, CV_RETR_EXTERNAL, CV_CHAIN_APPROX_SIMPLE);

And the result:

What I want to find:

How can I increase the precision of the cv::findContours in order to find what I want?

Thanks.

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Apply Erosion or Morphology Transformations(opening) before findcontour and try again.

Haris ( 2014-06-05 09:59:00 -0600 )edit

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answered 2014-06-06 11:26:20 -0600

Pedro Batista

2213 ●5 ●18 ●42 https://lnkd.in/bw9XGH8

All that cv::FindContours method does is detect groups of connected pixels, it does not care if two separated blobs actually belong to the same object.

The easiest solution to solve this problem is to apply dilate operations on your image to make sure that the blobs that belong to the same object become connected.

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The real problem with dilate or erosion is that I have a set of different images and once applied dilate or erosion it doesn't work as expected in some other images. - It's a loop that goes inside of a folder scanning all the images inside and apply the effects.