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Merge pull request #6936 from catree:fix_NAryMatIterator_code_example

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Maksim Shabunin 2016-07-18 08:38:49 +00:00
commit 070f0f8445
1 changed files with 17 additions and 9 deletions
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26
modules/core/include/opencv2/core/mat.hpp
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@ -3146,21 +3146,29 @@ The example below illustrates how you can compute a normalized and threshold 3D
}
minProb *= image.rows*image.cols;
Mat plane;
NAryMatIterator it(&hist, &plane, 1);
// initialize iterator (the style is different from STL).
// after initialization the iterator will contain
// the number of slices or planes the iterator will go through.
// it simultaneously increments iterators for several matrices
// supplied as a null terminated list of pointers
const Mat* arrays[] = {&hist, 0};
Mat planes[1];
NAryMatIterator itNAry(arrays, planes, 1);
double s = 0;
// iterate through the matrix. on each iteration
// it.planes[*] (of type Mat) will be set to the current plane.
for(int p = 0; p < it.nplanes; p++, ++it)
// itNAry.planes[i] (of type Mat) will be set to the current plane
// of the i-th n-dim matrix passed to the iterator constructor.
for(int p = 0; p < itNAry.nplanes; p++, ++itNAry)
{
threshold(it.planes[0], it.planes[0], minProb, 0, THRESH_TOZERO);
s += sum(it.planes[0])[0];
threshold(itNAry.planes[0], itNAry.planes[0], minProb, 0, THRESH_TOZERO);
s += sum(itNAry.planes[0])[0];
}
s = 1./s;
it = NAryMatIterator(&hist, &plane, 1);
for(int p = 0; p < it.nplanes; p++, ++it)
it.planes[0] *= s;
itNAry = NAryMatIterator(arrays, planes, 1);
for(int p = 0; p < itNAry.nplanes; p++, ++itNAry)
itNAry.planes[0] *= s;
}
@endcode
*/