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