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Matrix Reductions
=================
.. highlight:: cpp
.. index:: gpu::meanStdDev
gpu::meanStdDev
-------------------
.. ocv:function:: void gpu::meanStdDev(const GpuMat\& mtx, Scalar\& mean, Scalar\& stddev)
Computes a mean value and a standard deviation of matrix elements.
:param mtx: Source matrix. ``CV_8UC1`` matrices are supported for now.
:param mean: Mean value.
:param stddev: Standard deviation value.
.. seealso::
:ocv:func:`meanStdDev`
.. index:: gpu::norm
gpu::norm
-------------
.. ocv:function:: double gpu::norm(const GpuMat\& src1, int normType=NORM_L2)
.. ocv:function:: double gpu::norm(const GpuMat\& src1, int normType, GpuMat\& buf)
.. ocv:function:: double norm(const GpuMat\& src1, const GpuMat\& src2, int normType=NORM_L2)
Returns the norm of a matrix (or difference of two matrices).
:param src1: Source matrix. Any matrices except 64F are supported.
:param src2: Second source matrix (if any) with the same size and type as ``src1``.
:param normType: Norm type. ``NORM_L1`` , ``NORM_L2`` , and ``NORM_INF`` are supported for now.
:param buf: Optional buffer to avoid extra memory allocations. It is resized automatically.
.. seealso::
:ocv:func:`norm`
.. index:: gpu::sum
gpu::sum
------------
.. ocv:function:: Scalar gpu::sum(const GpuMat\& src)
.. ocv:function:: Scalar gpu::sum(const GpuMat\& src, GpuMat\& buf)
Returns the sum of matrix elements.
:param src: Source image of any depth except for ``CV_64F`` .
:param buf: Optional buffer to avoid extra memory allocations. It is resized automatically.
.. seealso::
:ocv:func:`sum`
.. index:: gpu::absSum
gpu::absSum
---------------
.. ocv:function:: Scalar gpu::absSum(const GpuMat\& src)
.. ocv:function:: Scalar gpu::absSum(const GpuMat\& src, GpuMat\& buf)
Returns the sum of absolute values for matrix elements.
:param src: Source image of any depth except for ``CV_64F`` .
:param buf: Optional buffer to avoid extra memory allocations. It is resized automatically.
.. index:: gpu::sqrSum
gpu::sqrSum
---------------
.. ocv:function:: Scalar gpu::sqrSum(const GpuMat\& src)
.. ocv:function:: Scalar gpu::sqrSum(const GpuMat\& src, GpuMat\& buf)
Returns the squared sum of matrix elements.
:param src: Source image of any depth except for ``CV_64F`` .
:param buf: Optional buffer to avoid extra memory allocations. It is resized automatically.
.. index:: gpu::minMax
gpu::minMax
---------------
.. ocv:function:: void gpu::minMax(const GpuMat\& src, double* minVal, double* maxVal=0, const GpuMat\& mask=GpuMat())
.. ocv:function:: void gpu::minMax(const GpuMat\& src, double* minVal, double* maxVal, const GpuMat\& mask, GpuMat\& buf)
Finds global minimum and maximum matrix elements and returns their values.
:param src: Single-channel source image.
:param minVal: Pointer to the returned minimum value. Use ``NULL`` if not required.
:param maxVal: Pointer to the returned maximum value. Use ``NULL`` if not required.
:param mask: Optional mask to select a sub-matrix.
:param buf: Optional buffer to avoid extra memory allocations. It is resized automatically.
The function does not work with ``CV_64F`` images on GPUs with the compute capability < 1.3.
.. seealso::
:ocv:func:`minMaxLoc`
.. index:: gpu::minMaxLoc
gpu::minMaxLoc
------------------
.. ocv:function:: void gpu::minMaxLoc(const GpuMat& src, double* minVal, double* maxVal=0, Point* minLoc=0, Point* maxLoc=0, const GpuMat& mask=GpuMat())
.. ocv:function:: void gpu::minMaxLoc(const GpuMat& src, double* minVal, double* maxVal, Point* minLoc, Point* maxLoc, const GpuMat& mask, GpuMat& valbuf, GpuMat& locbuf)
Finds global minimum and maximum matrix elements and returns their values with locations.
:param src: Single-channel source image.
:param minVal: Pointer to the returned minimum value. Use ``NULL`` if not required.
:param maxVal: Pointer to the returned maximum value. Use ``NULL`` if not required.
:param minValLoc: Pointer to the returned minimum location. Use ``NULL`` if not required.
:param maxValLoc: Pointer to the returned maximum location. Use ``NULL`` if not required.
:param mask: Optional mask to select a sub-matrix.
:param valbuf: Optional values buffer to avoid extra memory allocations. It is resized automatically.
:param locbuf: Optional locations buffer to avoid extra memory allocations. It is resized automatically.
The function does not work with ``CV_64F`` images on GPU with the compute capability < 1.3.
.. seealso::
:ocv:func:`minMaxLoc`
.. index:: gpu::countNonZero
gpu::countNonZero
---------------------
.. ocv:function:: int gpu::countNonZero(const GpuMat\& src)
.. ocv:function:: int gpu::countNonZero(const GpuMat\& src, GpuMat\& buf)
Counts non-zero matrix elements.
:param src: Single-channel source image.
:param buf: Optional buffer to avoid extra memory allocations. It is resized automatically.
The function does not work with ``CV_64F`` images on GPUs with the compute capability < 1.3.
.. seealso::
:ocv:func:`countNonZero`
|
