75 lines
2.7 KiB
ReStructuredText
75 lines
2.7 KiB
ReStructuredText
Color space processing
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======================
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.. highlight:: cpp
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gpu::cvtColor
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-----------------
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Converts an image from one color space to another.
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.. ocv:function:: void gpu::cvtColor(const GpuMat& src, GpuMat& dst, int code, int dcn = 0, Stream& stream = Stream::Null())
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:param src: Source image with ``CV_8U`` , ``CV_16U`` , or ``CV_32F`` depth and 1, 3, or 4 channels.
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:param dst: Destination image with the same size and depth as ``src`` .
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:param code: Color space conversion code. For details, see :ocv:func:`cvtColor` . Conversion to/from Luv and Bayer color spaces is not supported.
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:param dcn: Number of channels in the destination image. If the parameter is 0, the number of the channels is derived automatically from ``src`` and the ``code`` .
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:param stream: Stream for the asynchronous version.
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3-channel color spaces (like ``HSV``, ``XYZ``, and so on) can be stored in a 4-channel image for better performance.
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.. seealso:: :ocv:func:`cvtColor`
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gpu::swapChannels
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-----------------
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Exchanges the color channels of an image in-place.
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.. ocv:function:: void gpu::swapChannels(GpuMat& image, const int dstOrder[4], Stream& stream = Stream::Null())
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:param image: Source image. Supports only ``CV_8UC4`` type.
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:param dstOrder: Integer array describing how channel values are permutated. The n-th entry of the array contains the number of the channel that is stored in the n-th channel of the output image. E.g. Given an RGBA image, aDstOrder = [3,2,1,0] converts this to ABGR channel order.
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:param stream: Stream for the asynchronous version.
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The methods support arbitrary permutations of the original channels, including replication.
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gpu::alphaComp
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-------------------
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Composites two images using alpha opacity values contained in each image.
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.. ocv:function:: void gpu::alphaComp(const GpuMat& img1, const GpuMat& img2, GpuMat& dst, int alpha_op, Stream& stream = Stream::Null())
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:param img1: First image. Supports ``CV_8UC4`` , ``CV_16UC4`` , ``CV_32SC4`` and ``CV_32FC4`` types.
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:param img2: Second image. Must have the same size and the same type as ``img1`` .
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:param dst: Destination image.
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:param alpha_op: Flag specifying the alpha-blending operation:
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* **ALPHA_OVER**
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* **ALPHA_IN**
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* **ALPHA_OUT**
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* **ALPHA_ATOP**
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* **ALPHA_XOR**
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* **ALPHA_PLUS**
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* **ALPHA_OVER_PREMUL**
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* **ALPHA_IN_PREMUL**
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* **ALPHA_OUT_PREMUL**
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* **ALPHA_ATOP_PREMUL**
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* **ALPHA_XOR_PREMUL**
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* **ALPHA_PLUS_PREMUL**
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* **ALPHA_PREMUL**
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:param stream: Stream for the asynchronous version.
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