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add clarification on the acces paramter of the at operator

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StevenPuttemans 2016-02-05 13:21:40 +01:00
parent b148ef2b1f
commit 873399705d
1 changed files with 8 additions and 0 deletions
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modules/core/include/opencv2/core/mat.hpp
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@ -1702,6 +1702,14 @@ public:
for(int j = 0; j < H.cols; j++) for(int j = 0; j < H.cols; j++)
H.at<double>(i,j)=1./(i+j+1); H.at<double>(i,j)=1./(i+j+1);
@endcode @endcode
Keep in mind that the size identifier used in the at operator cannot be chosen at random. It depends
on the image from which you are trying to retrieve the data. The table below gives a better insight in this:
- If matrix is of type `CV_8U` or `CV_8S` then use `Mat.at<uchar>(y,x)`.
- If matrix is of type `CV_16U` or `CV_16S` then use `Mat.at<ushort>(y,x)`.
- If matrix is of type `CV_32S` or `CV_32F` then use `Mat.at<float>(y,x)`.
- If matrix is of type `CV_64FU` then use `Mat.at<double>(y,x)`.
@param i0 Index along the dimension 0 @param i0 Index along the dimension 0
*/ */
template<typename _Tp> _Tp& at(int i0=0); template<typename _Tp> _Tp& at(int i0=0);