197 lines
3.6 KiB
ReStructuredText
197 lines
3.6 KiB
ReStructuredText
Motion Analysis and Object Tracking
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===================================
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.. highlight:: c
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.. index:: Acc
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.. _Acc:
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Acc
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---
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.. cfunction:: void cvAcc( const CvArr* image, CvArr* sum, const CvArr* mask=NULL )
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Adds a frame to an accumulator.
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:param image: Input image, 1- or 3-channel, 8-bit or 32-bit floating point. (each channel of multi-channel image is processed independently)
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:param sum: Accumulator with the same number of channels as input image, 32-bit or 64-bit floating-point
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:param mask: Optional operation mask
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The function adds the whole image
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``image``
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or its selected region to the accumulator
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``sum``
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:
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.. math::
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\texttt{sum} (x,y) \leftarrow \texttt{sum} (x,y) + \texttt{image} (x,y) \quad \text{if} \quad \texttt{mask} (x,y) \ne 0
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.. index:: MultiplyAcc
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.. _MultiplyAcc:
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MultiplyAcc
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-----------
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.. cfunction:: void cvMultiplyAcc( const CvArr* image1, const CvArr* image2, CvArr* acc, const CvArr* mask=NULL )
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Adds the product of two input images to the accumulator.
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:param image1: First input image, 1- or 3-channel, 8-bit or 32-bit floating point (each channel of multi-channel image is processed independently)
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:param image2: Second input image, the same format as the first one
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:param acc: Accumulator with the same number of channels as input images, 32-bit or 64-bit floating-point
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:param mask: Optional operation mask
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The function adds the product of 2 images or their selected regions to the accumulator
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``acc``
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:
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.. math::
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\texttt{acc} (x,y) \leftarrow \texttt{acc} (x,y) + \texttt{image1} (x,y) \cdot \texttt{image2} (x,y) \quad \text{if} \quad \texttt{mask} (x,y) \ne 0
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.. index:: RunningAvg
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.. _RunningAvg:
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RunningAvg
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----------
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.. cfunction:: void cvRunningAvg( const CvArr* image, CvArr* acc, double alpha, const CvArr* mask=NULL )
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Updates the running average.
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:param image: Input image, 1- or 3-channel, 8-bit or 32-bit floating point (each channel of multi-channel image is processed independently)
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:param acc: Accumulator with the same number of channels as input image, 32-bit or 64-bit floating-point
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:param alpha: Weight of input image
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:param mask: Optional operation mask
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The function calculates the weighted sum of the input image
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``image``
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and the accumulator
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``acc``
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so that
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``acc``
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becomes a running average of frame sequence:
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.. math::
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\texttt{acc} (x,y) \leftarrow (1- \alpha ) \cdot \texttt{acc} (x,y) + \alpha \cdot \texttt{image} (x,y) \quad \text{if} \quad \texttt{mask} (x,y) \ne 0
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where
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:math:`\alpha`
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regulates the update speed (how fast the accumulator forgets about previous frames).
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.. index:: SquareAcc
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.. _SquareAcc:
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SquareAcc
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---------
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.. cfunction:: void cvSquareAcc( const CvArr* image, CvArr* sqsum, const CvArr* mask=NULL )
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Adds the square of the source image to the accumulator.
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:param image: Input image, 1- or 3-channel, 8-bit or 32-bit floating point (each channel of multi-channel image is processed independently)
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:param sqsum: Accumulator with the same number of channels as input image, 32-bit or 64-bit floating-point
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:param mask: Optional operation mask
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The function adds the input image
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``image``
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or its selected region, raised to power 2, to the accumulator
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``sqsum``
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:
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.. math::
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\texttt{sqsum} (x,y) \leftarrow \texttt{sqsum} (x,y) + \texttt{image} (x,y)^2 \quad \text{if} \quad \texttt{mask} (x,y) \ne 0
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