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296 lines
10 KiB
ReStructuredText
296 lines
10 KiB
ReStructuredText
Matrix Reductions
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=================
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.. highlight:: cpp
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gpu::norm
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---------
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Returns the norm of a matrix (or difference of two matrices).
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.. ocv:function:: double gpu::norm(InputArray src1, int normType)
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.. ocv:function:: double gpu::norm(InputArray src1, int normType, GpuMat& buf)
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.. ocv:function:: double gpu::norm(InputArray src1, int normType, InputArray mask, GpuMat& buf)
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.. ocv:function:: double gpu::norm(InputArray src1, InputArray src2, int normType=NORM_L2)
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:param src1: Source matrix. Any matrices except 64F are supported.
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:param src2: 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 mask: optional operation mask; it must have the same size as ``src1`` and ``CV_8UC1`` type.
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:param buf: Optional buffer to avoid extra memory allocations. It is resized automatically.
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.. seealso:: :ocv:func:`norm`
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gpu::sum
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--------
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Returns the sum of matrix elements.
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.. ocv:function:: Scalar gpu::sum(InputArray src)
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.. ocv:function:: Scalar gpu::sum(InputArray src, GpuMat& buf)
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.. ocv:function:: Scalar gpu::sum(InputArray src, InputArray mask, GpuMat& buf)
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:param src: Source image of any depth except for ``CV_64F`` .
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:param mask: optional operation mask; it must have the same size as ``src1`` and ``CV_8UC1`` type.
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:param buf: Optional buffer to avoid extra memory allocations. It is resized automatically.
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.. seealso:: :ocv:func:`sum`
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gpu::absSum
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-----------
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Returns the sum of absolute values for matrix elements.
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.. ocv:function:: Scalar gpu::absSum(InputArray src)
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.. ocv:function:: Scalar gpu::absSum(InputArray src, GpuMat& buf)
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.. ocv:function:: Scalar gpu::absSum(InputArray src, InputArray mask, GpuMat& buf)
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:param src: Source image of any depth except for ``CV_64F`` .
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:param mask: optional operation mask; it must have the same size as ``src1`` and ``CV_8UC1`` type.
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:param buf: Optional buffer to avoid extra memory allocations. It is resized automatically.
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gpu::sqrSum
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-----------
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Returns the squared sum of matrix elements.
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.. ocv:function:: Scalar gpu::sqrSum(InputArray src)
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.. ocv:function:: Scalar gpu::sqrSum(InputArray src, GpuMat& buf)
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.. ocv:function:: Scalar gpu::sqrSum(InputArray src, InputArray mask, GpuMat& buf)
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:param src: Source image of any depth except for ``CV_64F`` .
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:param mask: optional operation mask; it must have the same size as ``src1`` and ``CV_8UC1`` type.
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:param buf: Optional buffer to avoid extra memory allocations. It is resized automatically.
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gpu::minMax
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-----------
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Finds global minimum and maximum matrix elements and returns their values.
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.. ocv:function:: void gpu::minMax(InputArray src, double* minVal, double* maxVal=0, InputArray mask=noArray())
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.. ocv:function:: void gpu::minMax(InputArray src, double* minVal, double* maxVal, InputArray mask, GpuMat& buf)
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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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.. seealso:: :ocv:func:`minMaxLoc`
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gpu::minMaxLoc
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--------------
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Finds global minimum and maximum matrix elements and returns their values with locations.
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.. ocv:function:: void gpu::minMaxLoc(InputArray src, double* minVal, double* maxVal=0, Point* minLoc=0, Point* maxLoc=0, InputArray mask=noArray())
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.. ocv:function:: void gpu::minMaxLoc(InputArray src, double* minVal, double* maxVal, Point* minLoc, Point* maxLoc, InputArray mask, GpuMat& valbuf, GpuMat& locbuf)
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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 minLoc: Pointer to the returned minimum location. Use ``NULL`` if not required.
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:param maxLoc: 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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.. seealso:: :ocv:func:`minMaxLoc`
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gpu::countNonZero
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-----------------
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Counts non-zero matrix elements.
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.. ocv:function:: int gpu::countNonZero(InputArray src)
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.. ocv:function:: int gpu::countNonZero(InputArray src, GpuMat& buf)
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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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.. seealso:: :ocv:func:`countNonZero`
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gpu::reduce
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-----------
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Reduces a matrix to a vector.
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.. ocv:function:: void gpu::reduce(InputArray mtx, OutputArray vec, int dim, int reduceOp, int dtype = -1, Stream& stream = Stream::Null())
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:param mtx: Source 2D matrix.
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:param vec: Destination vector. Its size and type is defined by ``dim`` and ``dtype`` parameters.
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:param dim: Dimension index along which the matrix is reduced. 0 means that the matrix is reduced to a single row. 1 means that the matrix is reduced to a single column.
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:param reduceOp: Reduction operation that could be one of the following:
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* **CV_REDUCE_SUM** The output is the sum of all rows/columns of the matrix.
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* **CV_REDUCE_AVG** The output is the mean vector of all rows/columns of the matrix.
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* **CV_REDUCE_MAX** The output is the maximum (column/row-wise) of all rows/columns of the matrix.
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* **CV_REDUCE_MIN** The output is the minimum (column/row-wise) of all rows/columns of the matrix.
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:param dtype: When it is negative, the destination vector will have the same type as the source matrix. Otherwise, its type will be ``CV_MAKE_TYPE(CV_MAT_DEPTH(dtype), mtx.channels())`` .
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:param stream: Stream for the asynchronous version.
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The function ``reduce`` reduces the matrix to a vector by treating the matrix rows/columns as a set of 1D vectors and performing the specified operation on the vectors until a single row/column is obtained. For example, the function can be used to compute horizontal and vertical projections of a raster image. In case of ``CV_REDUCE_SUM`` and ``CV_REDUCE_AVG`` , the output may have a larger element bit-depth to preserve accuracy. And multi-channel arrays are also supported in these two reduction modes.
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.. seealso:: :ocv:func:`reduce`
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gpu::meanStdDev
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---------------
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Computes a mean value and a standard deviation of matrix elements.
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.. ocv:function:: void gpu::meanStdDev(InputArray mtx, Scalar& mean, Scalar& stddev)
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.. ocv:function:: void gpu::meanStdDev(InputArray mtx, Scalar& mean, Scalar& stddev, GpuMat& buf)
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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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:param buf: Optional buffer to avoid extra memory allocations. It is resized automatically.
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.. seealso:: :ocv:func:`meanStdDev`
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gpu::rectStdDev
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---------------
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Computes a standard deviation of integral images.
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.. ocv:function:: void gpu::rectStdDev(InputArray src, InputArray sqr, OutputArray dst, Rect rect, Stream& stream = Stream::Null())
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:param src: Source image. Only the ``CV_32SC1`` type is supported.
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:param sqr: Squared source image. Only the ``CV_32FC1`` type is supported.
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:param dst: Destination image with the same type and size as ``src`` .
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:param rect: Rectangular window.
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:param stream: Stream for the asynchronous version.
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gpu::normalize
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--------------
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Normalizes the norm or value range of an array.
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.. ocv:function:: void gpu::normalize(InputArray src, OutputArray dst, double alpha = 1, double beta = 0, int norm_type = NORM_L2, int dtype = -1, InputArray mask = noArray())
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.. ocv:function:: void gpu::normalize(InputArray src, OutputArray dst, double alpha, double beta, int norm_type, int dtype, InputArray mask, GpuMat& norm_buf, GpuMat& cvt_buf)
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:param src: Input array.
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:param dst: Output array of the same size as ``src`` .
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:param alpha: Norm value to normalize to or the lower range boundary in case of the range normalization.
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:param beta: Upper range boundary in case of the range normalization; it is not used for the norm normalization.
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:param normType: Normalization type ( ``NORM_MINMAX`` , ``NORM_L2`` , ``NORM_L1`` or ``NORM_INF`` ).
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:param dtype: When negative, the output array has the same type as ``src``; otherwise, it has the same number of channels as ``src`` and the depth ``=CV_MAT_DEPTH(dtype)``.
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:param mask: Optional operation mask.
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:param norm_buf: Optional buffer to avoid extra memory allocations. It is resized automatically.
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:param cvt_buf: Optional buffer to avoid extra memory allocations. It is resized automatically.
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.. seealso:: :ocv:func:`normalize`
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gpu::integral
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-------------
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Computes an integral image.
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.. ocv:function:: void gpu::integral(InputArray src, OutputArray sum, Stream& stream = Stream::Null())
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.. ocv:function:: void gpu::integral(InputArray src, OutputArray sum, GpuMat& buffer, Stream& stream = Stream::Null())
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:param src: Source image. Only ``CV_8UC1`` images are supported for now.
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:param sum: Integral image containing 32-bit unsigned integer values packed into ``CV_32SC1`` .
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:param buffer: Optional buffer to avoid extra memory allocations. It is resized automatically.
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:param stream: Stream for the asynchronous version.
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.. seealso:: :ocv:func:`integral`
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gpu::sqrIntegral
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----------------
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Computes a squared integral image.
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.. ocv:function:: void gpu::sqrIntegral(InputArray src, OutputArray sqsum, Stream& stream = Stream::Null())
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.. ocv:function:: void gpu::sqrIntegral(InputArray src, OutputArray sqsum, GpuMat& buf, Stream& stream = Stream::Null())
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:param src: Source image. Only ``CV_8UC1`` images are supported for now.
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:param sqsum: Squared integral image containing 64-bit unsigned integer values packed into ``CV_64FC1`` .
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:param buf: Optional buffer to avoid extra memory allocations. It is resized automatically.
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:param stream: Stream for the asynchronous version.
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