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added function cv::findNonZero (patch #2205)

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This commit is contained in:
Vadim Pisarevsky 2012-10-11 22:52:15 +04:00
parent d72cc06b96
commit 8441cf700d
2 changed files with 25 additions and 0 deletions
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3
modules/core/include/opencv2/core/core.hpp
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@ -2102,6 +2102,9 @@ CV_EXPORTS_W void LUT(InputArray src, InputArray lut, OutputArray dst,
CV_EXPORTS_AS(sumElems) Scalar sum(InputArray src);
//! computes the number of nonzero array elements
CV_EXPORTS_W int countNonZero( InputArray src );
//! returns the list of locations of non-zero pixels
CV_EXPORTS_W void findNonZero( InputArray src, OutputArray idx );
//! computes mean value of selected array elements
CV_EXPORTS_W Scalar mean(InputArray src, InputArray mask=noArray());
//! computes mean value and standard deviation of all or selected array elements

22
modules/core/src/stat.cpp
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@ -1904,6 +1904,28 @@ void cv::batchDistance( InputArray _src1, InputArray _src2,
}
void cv::findNonZero( InputArray _src, OutputArray _idx )
{
Mat src = _src.getMat();
CV_Assert( src.type() == CV_8UC1 );
int n = countNonZero(src);
if( _idx.kind() == _InputArray::MAT && !_idx.getMatRef().isContinuous() )
_idx.release();
_idx.create(n, 1, CV_32SC2);
Mat idx = _idx.getMat();
CV_Assert(idx.isContinuous());
Point* idx_ptr = (Point*)idx.data;
for( int i = 0; i < src.rows; i++ )
{
const uchar* bin_ptr = src.ptr(i);
for( int j = 0; j < src.cols; j++ )
if( bin_ptr[j] )
*idx_ptr++ = Point(j, i);
}
}
CV_IMPL CvScalar cvSum( const CvArr* srcarr )
{
cv::Scalar sum = cv::sum(cv::cvarrToMat(srcarr, false, true, 1));