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Open Source Computer Vision Library
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105 lines
3.8 KiB
105 lines
3.8 KiB
12 years ago
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Histogram Calculation
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=====================
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.. highlight:: cpp
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gpu::evenLevels
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-------------------
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Computes levels with even distribution.
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.. ocv:function:: void gpu::evenLevels(GpuMat& levels, int nLevels, int lowerLevel, int upperLevel)
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:param levels: Destination array. ``levels`` has 1 row, ``nLevels`` columns, and the ``CV_32SC1`` type.
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:param nLevels: Number of computed levels. ``nLevels`` must be at least 2.
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:param lowerLevel: Lower boundary value of the lowest level.
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:param upperLevel: Upper boundary value of the greatest level.
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gpu::histEven
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-----------------
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Calculates a histogram with evenly distributed bins.
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.. ocv:function:: void gpu::histEven(const GpuMat& src, GpuMat& hist, int histSize, int lowerLevel, int upperLevel, Stream& stream = Stream::Null())
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.. ocv:function:: void gpu::histEven(const GpuMat& src, GpuMat& hist, GpuMat& buf, int histSize, int lowerLevel, int upperLevel, Stream& stream = Stream::Null())
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.. ocv:function:: void gpu::histEven( const GpuMat& src, GpuMat hist[4], int histSize[4], int lowerLevel[4], int upperLevel[4], Stream& stream=Stream::Null() )
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.. ocv:function:: void gpu::histEven( const GpuMat& src, GpuMat hist[4], GpuMat& buf, int histSize[4], int lowerLevel[4], int upperLevel[4], Stream& stream=Stream::Null() )
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:param src: Source image. ``CV_8U``, ``CV_16U``, or ``CV_16S`` depth and 1 or 4 channels are supported. For a four-channel image, all channels are processed separately.
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:param hist: Destination histogram with one row, ``histSize`` columns, and the ``CV_32S`` type.
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:param histSize: Size of the histogram.
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:param lowerLevel: Lower boundary of lowest-level bin.
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:param upperLevel: Upper boundary of highest-level bin.
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:param buf: Optional buffer to avoid extra memory allocations (for many calls with the same sizes).
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:param stream: Stream for the asynchronous version.
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gpu::histRange
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------------------
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Calculates a histogram with bins determined by the ``levels`` array.
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.. ocv:function:: void gpu::histRange(const GpuMat& src, GpuMat& hist, const GpuMat& levels, Stream& stream = Stream::Null())
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.. ocv:function:: void gpu::histRange(const GpuMat& src, GpuMat& hist, const GpuMat& levels, GpuMat& buf, Stream& stream = Stream::Null())
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:param src: Source image. ``CV_8U`` , ``CV_16U`` , or ``CV_16S`` depth and 1 or 4 channels are supported. For a four-channel image, all channels are processed separately.
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:param hist: Destination histogram with one row, ``(levels.cols-1)`` columns, and the ``CV_32SC1`` type.
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:param levels: Number of levels in the histogram.
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:param buf: Optional buffer to avoid extra memory allocations (for many calls with the same sizes).
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:param stream: Stream for the asynchronous version.
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gpu::calcHist
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------------------
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Calculates histogram for one channel 8-bit image.
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.. ocv:function:: void gpu::calcHist(const GpuMat& src, GpuMat& hist, Stream& stream = Stream::Null())
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:param src: Source image.
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:param hist: Destination histogram with one row, 256 columns, and the ``CV_32SC1`` type.
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:param stream: Stream for the asynchronous version.
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gpu::equalizeHist
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------------------
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Equalizes the histogram of a grayscale image.
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.. ocv:function:: void gpu::equalizeHist(const GpuMat& src, GpuMat& dst, Stream& stream = Stream::Null())
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.. ocv:function:: void gpu::equalizeHist(const GpuMat& src, GpuMat& dst, GpuMat& hist, GpuMat& buf, Stream& stream = Stream::Null())
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:param src: Source image.
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:param dst: Destination image.
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:param hist: Destination histogram with one row, 256 columns, and the ``CV_32SC1`` type.
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:param buf: Optional buffer to avoid extra memory allocations (for many calls with the same sizes).
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:param stream: Stream for the asynchronous version.
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.. seealso:: :ocv:func:`equalizeHist`
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