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Merge pull request #3719 from theodr:document_findnonzero_function

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Vadim Pisarevsky 2015-02-19 18:36:09 +00:00
commit aec8fd3243
1 changed files with 25 additions and 2 deletions
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27
modules/core/include/opencv2/core.hpp
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@ -545,8 +545,31 @@ The function returns the number of non-zero elements in src :
*/
CV_EXPORTS_W int countNonZero( InputArray src );
/** @brief returns the list of locations of non-zero pixels
@todo document
/** @brief Returns the list of locations of non-zero pixels
Given a binary matrix (likely returned from an operation such
as threshold(), compare(), >, ==, etc, return all of
the non-zero indices as a cv::Mat or std::vector<cv::Point> (x,y)
For example:
@code{.cpp}
cv::Mat binaryImage; // input, binary image
cv::Mat locations; // output, locations of non-zero pixels
cv::findNonZero(binaryImage, locations);
// access pixel coordinates
Point pnt = locations.at<Point>(i);
@endcode
or
@code{.cpp}
cv::Mat binaryImage; // input, binary image
vector<Point> locations; // output, locations of non-zero pixels
cv::findNonZero(binaryImage, locations);
// access pixel coordinates
Point pnt = locations[i];
@endcode
@param src single-channel array (type CV_8UC1)
@param idx the output array, type of cv::Mat or std::vector<Point>, corresponding to non-zero indices in the input
*/
CV_EXPORTS_W void findNonZero( InputArray src, OutputArray idx );