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252 lines
8.7 KiB
ReStructuredText
252 lines
8.7 KiB
ReStructuredText
Image Warping
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=============
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.. highlight:: cpp
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cuda::remap
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-----------
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Applies a generic geometrical transformation to an image.
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.. ocv:function:: void cuda::remap(InputArray src, OutputArray dst, InputArray xmap, InputArray ymap, int interpolation, int borderMode = BORDER_CONSTANT, Scalar borderValue = Scalar(), Stream& stream = Stream::Null())
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:param src: Source image.
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:param dst: Destination image with the size the same as ``xmap`` and the type the same as ``src`` .
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:param xmap: X values. Only ``CV_32FC1`` type is supported.
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:param ymap: Y values. Only ``CV_32FC1`` type is supported.
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:param interpolation: Interpolation method (see :ocv:func:`resize` ). ``INTER_NEAREST`` , ``INTER_LINEAR`` and ``INTER_CUBIC`` are supported for now.
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:param borderMode: Pixel extrapolation method (see :ocv:func:`borderInterpolate` ). ``BORDER_REFLECT101`` , ``BORDER_REPLICATE`` , ``BORDER_CONSTANT`` , ``BORDER_REFLECT`` and ``BORDER_WRAP`` are supported for now.
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:param borderValue: Value used in case of a constant border. By default, it is 0.
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:param stream: Stream for the asynchronous version.
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The function transforms the source image using the specified map:
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.. math::
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\texttt{dst} (x,y) = \texttt{src} (xmap(x,y), ymap(x,y))
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Values of pixels with non-integer coordinates are computed using the bilinear interpolation.
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.. seealso:: :ocv:func:`remap`
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cuda::resize
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------------
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Resizes an image.
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.. ocv:function:: void cuda::resize(InputArray src, OutputArray dst, Size dsize, double fx=0, double fy=0, int interpolation = INTER_LINEAR, Stream& stream = Stream::Null())
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:param src: Source image.
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:param dst: Destination image with the same type as ``src`` . The size is ``dsize`` (when it is non-zero) or the size is computed from ``src.size()`` , ``fx`` , and ``fy`` .
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:param dsize: Destination image size. If it is zero, it is computed as:
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.. math::
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\texttt{dsize = Size(round(fx*src.cols), round(fy*src.rows))}
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Either ``dsize`` or both ``fx`` and ``fy`` must be non-zero.
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:param fx: Scale factor along the horizontal axis. If it is zero, it is computed as:
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.. math::
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\texttt{(double)dsize.width/src.cols}
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:param fy: Scale factor along the vertical axis. If it is zero, it is computed as:
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.. math::
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\texttt{(double)dsize.height/src.rows}
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:param interpolation: Interpolation method. ``INTER_NEAREST`` , ``INTER_LINEAR`` and ``INTER_CUBIC`` are supported for now.
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:param stream: Stream for the asynchronous version.
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.. seealso:: :ocv:func:`resize`
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cuda::warpAffine
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----------------
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Applies an affine transformation to an image.
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.. ocv:function:: void cuda::warpAffine(InputArray src, OutputArray dst, InputArray M, Size dsize, int flags = INTER_LINEAR, int borderMode = BORDER_CONSTANT, Scalar borderValue = Scalar(), Stream& stream = Stream::Null())
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:param src: Source image. ``CV_8U`` , ``CV_16U`` , ``CV_32S`` , or ``CV_32F`` depth and 1, 3, or 4 channels are supported.
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:param dst: Destination image with the same type as ``src`` . The size is ``dsize`` .
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:param M: *2x3* transformation matrix.
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:param dsize: Size of the destination image.
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:param flags: Combination of interpolation methods (see :ocv:func:`resize`) and the optional flag ``WARP_INVERSE_MAP`` specifying that ``M`` is an inverse transformation ( ``dst=>src`` ). Only ``INTER_NEAREST`` , ``INTER_LINEAR`` , and ``INTER_CUBIC`` interpolation methods are supported.
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:param stream: Stream for the asynchronous version.
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.. seealso:: :ocv:func:`warpAffine`
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cuda::buildWarpAffineMaps
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-------------------------
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Builds transformation maps for affine transformation.
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.. ocv:function:: void cuda::buildWarpAffineMaps(InputArray M, bool inverse, Size dsize, OutputArray xmap, OutputArray ymap, Stream& stream = Stream::Null())
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:param M: *2x3* transformation matrix.
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:param inverse: Flag specifying that ``M`` is an inverse transformation ( ``dst=>src`` ).
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:param dsize: Size of the destination image.
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:param xmap: X values with ``CV_32FC1`` type.
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:param ymap: Y values with ``CV_32FC1`` type.
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:param stream: Stream for the asynchronous version.
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.. seealso:: :ocv:func:`cuda::warpAffine` , :ocv:func:`cuda::remap`
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cuda::warpPerspective
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---------------------
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Applies a perspective transformation to an image.
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.. ocv:function:: void cuda::warpPerspective(InputArray src, OutputArray dst, InputArray M, Size dsize, int flags = INTER_LINEAR, int borderMode = BORDER_CONSTANT, Scalar borderValue = Scalar(), Stream& stream = Stream::Null())
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:param src: Source image. ``CV_8U`` , ``CV_16U`` , ``CV_32S`` , or ``CV_32F`` depth and 1, 3, or 4 channels are supported.
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:param dst: Destination image with the same type as ``src`` . The size is ``dsize`` .
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:param M: *3x3* transformation matrix.
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:param dsize: Size of the destination image.
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:param flags: Combination of interpolation methods (see :ocv:func:`resize` ) and the optional flag ``WARP_INVERSE_MAP`` specifying that ``M`` is the inverse transformation ( ``dst => src`` ). Only ``INTER_NEAREST`` , ``INTER_LINEAR`` , and ``INTER_CUBIC`` interpolation methods are supported.
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:param stream: Stream for the asynchronous version.
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.. seealso:: :ocv:func:`warpPerspective`
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cuda::buildWarpPerspectiveMaps
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------------------------------
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Builds transformation maps for perspective transformation.
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.. ocv:function:: void cuda::buildWarpAffineMaps(InputArray M, bool inverse, Size dsize, OutputArray xmap, OutputArray ymap, Stream& stream = Stream::Null())
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:param M: *3x3* transformation matrix.
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:param inverse: Flag specifying that ``M`` is an inverse transformation ( ``dst=>src`` ).
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:param dsize: Size of the destination image.
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:param xmap: X values with ``CV_32FC1`` type.
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:param ymap: Y values with ``CV_32FC1`` type.
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:param stream: Stream for the asynchronous version.
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.. seealso:: :ocv:func:`cuda::warpPerspective` , :ocv:func:`cuda::remap`
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cuda::buildWarpPlaneMaps
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------------------------
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Builds plane warping maps.
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.. ocv:function:: void cuda::buildWarpPlaneMaps(Size src_size, Rect dst_roi, InputArray K, InputArray R, InputArray T, float scale, OutputArray map_x, OutputArray map_y, Stream& stream = Stream::Null())
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:param stream: Stream for the asynchronous version.
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cuda::buildWarpCylindricalMaps
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------------------------------
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Builds cylindrical warping maps.
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.. ocv:function:: void cuda::buildWarpCylindricalMaps(Size src_size, Rect dst_roi, InputArray K, InputArray R, float scale, OutputArray map_x, OutputArray map_y, Stream& stream = Stream::Null())
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:param stream: Stream for the asynchronous version.
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cuda::buildWarpSphericalMaps
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----------------------------
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Builds spherical warping maps.
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.. ocv:function:: void cuda::buildWarpSphericalMaps(Size src_size, Rect dst_roi, InputArray K, InputArray R, float scale, OutputArray map_x, OutputArray map_y, Stream& stream = Stream::Null())
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:param stream: Stream for the asynchronous version.
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cuda::rotate
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------------
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Rotates an image around the origin (0,0) and then shifts it.
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.. ocv:function:: void cuda::rotate(InputArray src, OutputArray dst, Size dsize, double angle, double xShift = 0, double yShift = 0, int interpolation = INTER_LINEAR, Stream& stream = Stream::Null())
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:param src: Source image. Supports 1, 3 or 4 channels images with ``CV_8U`` , ``CV_16U`` or ``CV_32F`` depth.
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:param dst: Destination image with the same type as ``src`` . The size is ``dsize`` .
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:param dsize: Size of the destination image.
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:param angle: Angle of rotation in degrees.
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:param xShift: Shift along the horizontal axis.
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:param yShift: Shift along the vertical axis.
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:param interpolation: Interpolation method. Only ``INTER_NEAREST`` , ``INTER_LINEAR`` , and ``INTER_CUBIC`` are supported.
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:param stream: Stream for the asynchronous version.
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.. seealso:: :ocv:func:`cuda::warpAffine`
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cuda::pyrDown
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-------------
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Smoothes an image and downsamples it.
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.. ocv:function:: void cuda::pyrDown(InputArray src, OutputArray dst, Stream& stream = Stream::Null())
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:param src: Source image.
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:param dst: Destination image. Will have ``Size((src.cols+1)/2, (src.rows+1)/2)`` size and the same type as ``src`` .
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:param stream: Stream for the asynchronous version.
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.. seealso:: :ocv:func:`pyrDown`
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cuda::pyrUp
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-----------
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Upsamples an image and then smoothes it.
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.. ocv:function:: void cuda::pyrUp(InputArray src, OutputArray dst, Stream& stream = Stream::Null())
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:param src: Source image.
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:param dst: Destination image. Will have ``Size(src.cols*2, src.rows*2)`` size and the same type as ``src`` .
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:param stream: Stream for the asynchronous version.
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.. seealso:: :ocv:func:`pyrUp`
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