Operations on Matrices ====================== .. highlight:: cpp gpu::gemm ------------------ Performs generalized matrix multiplication. .. ocv:function:: void gemm(const GpuMat& src1, const GpuMat& src2, double alpha, const GpuMat& src3, double beta, GpuMat& dst, int flags = 0, Stream& stream = Stream::Null()) :param src1: First multiplied input matrix that should have ``CV_32FC1`` , ``CV_64FC1`` , ``CV_32FC2`` , or ``CV_64FC2`` type. :param src2: Second multiplied input matrix of the same type as ``src1`` . :param alpha: Weight of the matrix product. :param src3: Third optional delta matrix added to the matrix product. It should have the same type as ``src1`` and ``src2`` . :param beta: Weight of ``src3`` . :param dst: Destination matrix. It has the proper size and the same type as input matrices. :param flags: Operation flags: * **GEMM_1_T** transpose ``src1`` * **GEMM_2_T** transpose ``src2`` * **GEMM_3_T** transpose ``src3`` :param stream: Stream for the asynchronous version. The function performs generalized matrix multiplication similar to the ``gemm`` functions in BLAS level 3. For example, ``gemm(src1, src2, alpha, src3, beta, dst, GEMM_1_T + GEMM_3_T)`` corresponds to .. math:: \texttt{dst} = \texttt{alpha} \cdot \texttt{src1} ^T \cdot \texttt{src2} + \texttt{beta} \cdot \texttt{src3} ^T .. seealso:: :ocv:func:`gemm` gpu::transpose ------------------ Transposes a matrix. .. ocv:function:: void gpu::transpose(const GpuMat& src, GpuMat& dst, Stream& stream = Stream::Null()) :param src: Source matrix. 1-, 4-, 8-byte element sizes are supported for now (CV_8UC1, CV_8UC4, CV_16UC2, CV_32FC1, etc). :param dst: Destination matrix. :param stream: Stream for the asynchronous version. .. seealso:: :ocv:func:`transpose` gpu::flip ------------- Flips a 2D matrix around vertical, horizontal, or both axes. .. ocv:function:: void gpu::flip(const GpuMat& src, GpuMat& dst, int flipCode, Stream& stream = Stream::Null()) :param src: Source matrix. Supports 1, 3 and 4 channels images with ``CV_8U``, ``CV_16U``, ``CV_32S`` or ``CV_32F`` depth. :param dst: Destination matrix. :param flipCode: Flip mode for the source: * ``0`` Flips around x-axis. * ``>0`` Flips around y-axis. * ``<0`` Flips around both axes. :param stream: Stream for the asynchronous version. .. seealso:: :ocv:func:`flip` gpu::LUT ------------ Transforms the source matrix into the destination matrix using the given look-up table: ``dst(I) = lut(src(I))`` .. ocv:function:: void gpu::LUT(const GpuMat& src, const Mat& lut, GpuMat& dst, Stream& stream = Stream::Null()) :param src: Source matrix. ``CV_8UC1`` and ``CV_8UC3`` matrices are supported for now. :param lut: Look-up table of 256 elements. It is a continuous ``CV_8U`` matrix. :param dst: Destination matrix with the same depth as ``lut`` and the same number of channels as ``src`` . :param stream: Stream for the asynchronous version. .. seealso:: :ocv:func:`LUT` gpu::merge -------------- Makes a multi-channel matrix out of several single-channel matrices. .. ocv:function:: void gpu::merge(const GpuMat* src, size_t n, GpuMat& dst, Stream& stream = Stream::Null()) .. ocv:function:: void gpu::merge(const vector& src, GpuMat& dst, Stream& stream = Stream::Null()) :param src: Array/vector of source matrices. :param n: Number of source matrices. :param dst: Destination matrix. :param stream: Stream for the asynchronous version. .. seealso:: :ocv:func:`merge` gpu::split -------------- Copies each plane of a multi-channel matrix into an array. .. ocv:function:: void gpu::split(const GpuMat& src, GpuMat* dst, Stream& stream = Stream::Null()) .. ocv:function:: void gpu::split(const GpuMat& src, vector& dst, Stream& stream = Stream::Null()) :param src: Source matrix. :param dst: Destination array/vector of single-channel matrices. :param stream: Stream for the asynchronous version. .. seealso:: :ocv:func:`split` gpu::magnitude ------------------ Computes magnitudes of complex matrix elements. .. ocv:function:: void gpu::magnitude(const GpuMat& xy, GpuMat& magnitude, Stream& stream = Stream::Null()) .. ocv:function:: void gpu::magnitude(const GpuMat& x, const GpuMat& y, GpuMat& magnitude, Stream& stream = Stream::Null()) :param xy: Source complex matrix in the interleaved format ( ``CV_32FC2`` ). :param x: Source matrix containing real components ( ``CV_32FC1`` ). :param y: Source matrix containing imaginary components ( ``CV_32FC1`` ). :param magnitude: Destination matrix of float magnitudes ( ``CV_32FC1`` ). :param stream: Stream for the asynchronous version. .. seealso:: :ocv:func:`magnitude` gpu::magnitudeSqr --------------------- Computes squared magnitudes of complex matrix elements. .. ocv:function:: void gpu::magnitudeSqr(const GpuMat& xy, GpuMat& magnitude, Stream& stream = Stream::Null()) .. ocv:function:: void gpu::magnitudeSqr(const GpuMat& x, const GpuMat& y, GpuMat& magnitude, Stream& stream = Stream::Null()) :param xy: Source complex matrix in the interleaved format ( ``CV_32FC2`` ). :param x: Source matrix containing real components ( ``CV_32FC1`` ). :param y: Source matrix containing imaginary components ( ``CV_32FC1`` ). :param magnitude: Destination matrix of float magnitude squares ( ``CV_32FC1`` ). :param stream: Stream for the asynchronous version. gpu::phase -------------- Computes polar angles of complex matrix elements. .. ocv:function:: void gpu::phase(const GpuMat& x, const GpuMat& y, GpuMat& angle, bool angleInDegrees=false, Stream& stream = Stream::Null()) :param x: Source matrix containing real components ( ``CV_32FC1`` ). :param y: Source matrix containing imaginary components ( ``CV_32FC1`` ). :param angle: Destionation matrix of angles ( ``CV_32FC1`` ). :param angleInDegrees: Flag for angles that must be evaluated in degress. :param stream: Stream for the asynchronous version. .. seealso:: :ocv:func:`phase` gpu::cartToPolar -------------------- Converts Cartesian coordinates into polar. .. ocv:function:: void gpu::cartToPolar(const GpuMat& x, const GpuMat& y, GpuMat& magnitude, GpuMat& angle, bool angleInDegrees=false, Stream& stream = Stream::Null()) :param x: Source matrix containing real components ( ``CV_32FC1`` ). :param y: Source matrix containing imaginary components ( ``CV_32FC1`` ). :param magnitude: Destination matrix of float magnitudes ( ``CV_32FC1`` ). :param angle: Destionation matrix of angles ( ``CV_32FC1`` ). :param angleInDegrees: Flag for angles that must be evaluated in degress. :param stream: Stream for the asynchronous version. .. seealso:: :ocv:func:`cartToPolar` gpu::polarToCart -------------------- Converts polar coordinates into Cartesian. .. ocv:function:: void gpu::polarToCart(const GpuMat& magnitude, const GpuMat& angle, GpuMat& x, GpuMat& y, bool angleInDegrees=false, Stream& stream = Stream::Null()) :param magnitude: Source matrix containing magnitudes ( ``CV_32FC1`` ). :param angle: Source matrix containing angles ( ``CV_32FC1`` ). :param x: Destination matrix of real components ( ``CV_32FC1`` ). :param y: Destination matrix of imaginary components ( ``CV_32FC1`` ). :param angleInDegrees: Flag that indicates angles in degress. :param stream: Stream for the asynchronous version. .. seealso:: :ocv:func:`polarToCart`