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Editorial Team
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Asked: 2026-05-27T08:18:34+00:00

Here is a fairly easy question, though I have a hard time answering my

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Here is a fairly easy question, though I have a hard time answering my own question.

We are a group of five people, that have to write a report and we have to document everything we do etc. In our project, we uses the function ‘findContours();’ which is a function within the OpenCV library.

We know that the ‘findContours();’ function runs a Grass-Fire algorithm, though we need to document what kernel we are using, which we don’t have a clue about.

The function we runs looks like this:

findContours( mGreenScale, vecContours, vecHierarchy, CV_RETR_CCOMP,
CV_CHAIN_APPROX_SIMPLE );

  • mGreenScale: Our binary image we run the function upon.
  • vecCountours: The vector handler that keep tracks on which pixel is a part of the contour.
  • vexHierarchy: We are not quiet sure what this is, though we think its some sort of array that handles the contour hierarchy, and keeps
    track of what are edge contours and what are non-edge contours.
  • The two other inputs to the function is unknown to us, and we think its one of those two that defines the kernel we use.

I hope anybody is capable of identifying what kernel we are using.
Thanks in advance, pleas ask for further information if you feel I missed something out of importance.

circumstantial explanation:
We’re a small group of not so experienced programmer, who have limited knowledge in C++ and just begun working with OpenCV a month ago. We have a limited time schedule, and a documentation that needs to be done within two weeks. We have already been looking through this exact site: OpenCV documentation though there are still terms we don’t understand.
We don’t have the necessary time to check through the source code nor the experience to do so.
We think it is a grass-fire algorithm, as we know no other algorithm capable of detecting BLOBS.

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1 Answer

  1. Editorial Team

    What each parameter is doing is clearly explained in the OpenCV documentation

    And you can find the kernel looking into the OpenCV code. It’s open-source. But I am not sure if it used any kernel at all. How do you know about the algorithm if you did not check the source?

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