Detección de la mancha más grande en una imagen binaria

Utilice las findContours to find all blobs in image and using contourArea you can calculate blob's area. So just find contour (blob) with biggest area.

A good point of start would be the CVBloblib . I used it in the past and it works fine.

Then it is just a question of calculating the blobs area or perimeter, depending on what you want :)

I don't know what is the best practice here, but I'd do it somehow like this:

• First find all blobs. You could use cvBlobslib or cvBlob or findContours etc.

• Then store all blobs in vector. Sort your vector by blobs' area. And then get the last blob.

  bool sortBlobsASC(CBlob first, CBlob second) { return first.Area() < second.Area(); }

  std::sort(myvec.begin(), myvec.end(), sortBlobsASC);