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