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150 lines
5.2 KiB
150 lines
5.2 KiB
Histogram Calculation |
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===================== |
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.. highlight:: cpp |
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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(InputArray src, OutputArray hist, Stream& stream = Stream::Null()) |
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:param src: Source image with ``CV_8UC1`` type. |
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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(InputArray src, OutputArray dst, Stream& stream = Stream::Null()) |
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.. ocv:function:: void gpu::equalizeHist(InputArray src, OutputArray dst, InputOutputArray buf, Stream& stream = Stream::Null()) |
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:param src: Source image with ``CV_8UC1`` type. |
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:param dst: Destination image. |
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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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gpu::CLAHE |
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---------- |
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.. ocv:class:: gpu::CLAHE : public cv::CLAHE |
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Base class for Contrast Limited Adaptive Histogram Equalization. :: |
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class CV_EXPORTS CLAHE : public cv::CLAHE |
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{ |
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public: |
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using cv::CLAHE::apply; |
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virtual void apply(InputArray src, OutputArray dst, Stream& stream) = 0; |
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}; |
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gpu::CLAHE::apply |
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----------------- |
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Equalizes the histogram of a grayscale image using Contrast Limited Adaptive Histogram Equalization. |
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.. ocv:function:: void gpu::CLAHE::apply(InputArray src, OutputArray dst) |
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.. ocv:function:: void gpu::CLAHE::apply(InputArray src, OutputArray dst, Stream& stream) |
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:param src: Source image with ``CV_8UC1`` type. |
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:param dst: Destination image. |
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:param stream: Stream for the asynchronous version. |
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gpu::createCLAHE |
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---------------- |
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Creates implementation for :ocv:class:`gpu::CLAHE` . |
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.. ocv:function:: Ptr<gpu::CLAHE> createCLAHE(double clipLimit = 40.0, Size tileGridSize = Size(8, 8)) |
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:param clipLimit: Threshold for contrast limiting. |
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:param tileGridSize: Size of grid for histogram equalization. Input image will be divided into equally sized rectangular tiles. ``tileGridSize`` defines the number of tiles in row and column. |
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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(OutputArray 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(InputArray src, OutputArray hist, int histSize, int lowerLevel, int upperLevel, Stream& stream = Stream::Null()) |
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.. ocv:function:: void gpu::histEven(InputArray src, OutputArray hist, InputOutputArray buf, int histSize, int lowerLevel, int upperLevel, Stream& stream = Stream::Null()) |
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.. ocv:function:: void gpu::histEven(InputArray 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(InputArray src, GpuMat hist[4], InputOutputArray 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(InputArray src, OutputArray hist, InputArray levels, Stream& stream = Stream::Null()) |
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.. ocv:function:: void gpu::histRange(InputArray src, OutputArray hist, InputArray levels, InputOutputArray buf, Stream& stream = Stream::Null()) |
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.. ocv:function:: void gpu::histRange(InputArray src, GpuMat hist[4], const GpuMat levels[4], Stream& stream = Stream::Null()) |
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.. ocv:function:: void gpu::histRange(InputArray src, GpuMat hist[4], const GpuMat levels[4], InputOutputArray 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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