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180 lines
5.2 KiB
180 lines
5.2 KiB
Matrix Reductions |
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================= |
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.. highlight:: cpp |
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.. index:: gpu::meanStdDev |
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cv::gpu::meanStdDev |
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------------------- |
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.. c:function:: void meanStdDev(const GpuMat\& mtx, Scalar\& mean, Scalar\& stddev) |
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Computes mean value and 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: |
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:func:`meanStdDev` . |
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.. index:: gpu::norm |
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cv::gpu::norm |
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------------- |
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.. c:function:: double norm(const GpuMat\& src, int normType=NORM_L2) |
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Returns norm of matrix (or of two matrices difference). |
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:param src: Source matrix. Any matrices except 64F are supported. |
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:param normType: Norm type. ``NORM_L1`` , ``NORM_L2`` and ``NORM_INF`` are supported for now. |
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.. c:function:: double norm(const GpuMat\& src, int normType, GpuMat\& buf) |
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* **src** Source matrix. Any matrices except 64F are supported. |
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* **normType** Norm type. ``NORM_L1`` , ``NORM_L2`` and ``NORM_INF`` are supported for now. |
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* **buf** Optional buffer to avoid extra memory allocations. It's resized automatically. |
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.. c:function:: double norm(const GpuMat\& src1, const GpuMat\& src2, |
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int normType=NORM_L2) |
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* **src1** First source matrix. ``CV_8UC1`` matrices are supported for now. |
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* **src2** Second source matrix. Must have the same size and type as ``src1`` |
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. |
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* **normType** Norm type. ``NORM_L1`` , ``NORM_L2`` and ``NORM_INF`` are supported for now. |
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See also: |
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:func:`norm` . |
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.. index:: gpu::sum |
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cv::gpu::sum |
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------------ |
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.. c:function:: Scalar sum(const GpuMat\& src) |
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.. c:function:: Scalar sum(const GpuMat\& src, GpuMat\& buf) |
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Returns sum of matrix elements. |
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:param src: Source image of any depth except ``CV_64F`` . |
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:param buf: Optional buffer to avoid extra memory allocations. It's resized automatically. |
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See also: |
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:func:`sum` . |
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.. index:: gpu::absSum |
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cv::gpu::absSum |
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--------------- |
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.. c:function:: Scalar absSum(const GpuMat\& src) |
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.. c:function:: Scalar absSum(const GpuMat\& src, GpuMat\& buf) |
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Returns sum of matrix elements absolute values. |
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:param src: Source image of any depth except ``CV_64F`` . |
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:param buf: Optional buffer to avoid extra memory allocations. It's resized automatically. |
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.. index:: gpu::sqrSum |
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cv::gpu::sqrSum |
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--------------- |
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.. c:function:: Scalar sqrSum(const GpuMat\& src) |
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.. c:function:: Scalar sqrSum(const GpuMat\& src, GpuMat\& buf) |
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Returns squared sum of matrix elements. |
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:param src: Source image of any depth except ``CV_64F`` . |
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:param buf: Optional buffer to avoid extra memory allocations. It's resized automatically. |
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.. index:: gpu::minMax |
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cv::gpu::minMax |
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--------------- |
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.. c:function:: void minMax(const GpuMat\& src, double* minVal, |
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double* maxVal=0, const GpuMat\& mask=GpuMat()) |
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.. c:function:: void minMax(const GpuMat\& src, double* minVal, double* maxVal, |
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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 returned minimum value. ``NULL`` if not required. |
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:param maxVal: Pointer to returned maximum value. ``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's resized automatically. |
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Function doesn't work with ``CV_64F`` images on GPU with compute capability |
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:math:`<` 1.3. |
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See also: |
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:func:`minMaxLoc` . |
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.. index:: gpu::minMaxLoc |
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cv::gpu::minMaxLoc |
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------------------ |
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.. c:function:: void minMaxLoc(const GpuMat\& src, double\* minVal, double* maxVal=0, |
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Point* minLoc=0, Point* maxLoc=0, |
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const GpuMat\& mask=GpuMat()) |
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.. c:function:: void minMaxLoc(const GpuMat\& src, double* minVal, double* maxVal, |
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Point* minLoc, Point* maxLoc, const GpuMat\& mask, |
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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 returned minimum value. ``NULL`` if not required. |
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:param maxVal: Pointer to returned maximum value. ``NULL`` if not required. |
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:param minValLoc: Pointer to returned minimum location. ``NULL`` if not required. |
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:param maxValLoc: Pointer to returned maximum location. ``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's resized automatically. |
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:param locbuf: Optional locations buffer to avoid extra memory allocations. It's resized automatically. |
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Function doesn't work with ``CV_64F`` images on GPU with compute capability |
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:math:`<` 1.3. |
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See also: |
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:func:`minMaxLoc` . |
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.. index:: gpu::countNonZero |
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cv::gpu::countNonZero |
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--------------------- |
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.. c:function:: int countNonZero(const GpuMat\& src) |
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.. c:function:: int 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's resized automatically. |
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Function doesn't work with ``CV_64F`` images on GPU with compute capability |
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:math:`<` 1.3. |
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See also: |
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:func:`countNonZero` .
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