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119 lines
4.1 KiB
119 lines
4.1 KiB
Motion Analysis and Object Tracking |
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.. highlight:: cpp |
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.. index:: accumulate |
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accumulate |
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-------------- |
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.. c:function:: void accumulate( const Mat\& src, Mat\& dst, const Mat\& mask=Mat() ) |
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Adds an image to the accumulator. |
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:param src: Input image as 1- or 3-channel, 8-bit or 32-bit floating point. |
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:param dst: Accumulator image 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 ``src`` or some of its elements to ``dst`` : |
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.. math:: |
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\texttt{dst} (x,y) \leftarrow \texttt{dst} (x,y) + \texttt{src} (x,y) \quad \text{if} \quad \texttt{mask} (x,y) \ne 0 |
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The function supports multi-channel images. Each channel is processed independently. |
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The functions ``accumulate*`` can be used, for example, to collect statistics of a scene background viewed by a still camera and for the further foreground-background segmentation. |
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See Also: |
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:func:`accumulateSquare`, |
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:func:`accumulateProduct`, |
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:func:`accumulateWeighted` |
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.. index:: accumulateSquare |
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accumulateSquare |
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-------------------- |
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.. c:function:: void accumulateSquare( const Mat\& src, Mat\& dst, const Mat\& mask=Mat() ) |
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Adds the square of a source image to the accumulator. |
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:param src: Input image as 1- or 3-channel, 8-bit or 32-bit floating point. |
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:param dst: Accumulator image 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 ``src`` or its selected region, raised to power 2, to the accumulator ``dst`` : |
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.. math:: |
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\texttt{dst} (x,y) \leftarrow \texttt{dst} (x,y) + \texttt{src} (x,y)^2 \quad \text{if} \quad \texttt{mask} (x,y) \ne 0 |
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The function supports multi-channel images Each channel is processed independently. |
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See Also: |
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:func:`accumulateSquare`, |
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:func:`accumulateProduct`, |
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:func:`accumulateWeighted` |
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.. index:: accumulateProduct |
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accumulateProduct |
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--------------------- |
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.. c:function:: void accumulateProduct( const Mat\& src1, const Mat\& src2, Mat\& dst, const Mat\& mask=Mat() ) |
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Adds the per-element product of two input images to the accumulator. |
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:param src1: The first input image, 1- or 3-channel, 8-bit or 32-bit floating point. |
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:param src2: The second input image of the same type and the same size as ``src1`` . |
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:param dst: 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 ``dst`` : |
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.. math:: |
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\texttt{dst} (x,y) \leftarrow \texttt{dst} (x,y) + \texttt{src1} (x,y) \cdot \texttt{src2} (x,y) \quad \text{if} \quad \texttt{mask} (x,y) \ne 0 |
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The function supports multi-channel images. Each channel is processed independently. |
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See Also: |
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:func:`accumulate`, |
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:func:`accumulateSquare`, |
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:func:`accumulateWeighted` |
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.. index:: accumulateWeighted |
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accumulateWeighted |
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---------------------- |
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.. c:function:: void accumulateWeighted( const Mat\& src, Mat\& dst, double alpha, const Mat\& mask=Mat() ) |
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Updates a running average. |
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:param src: Input image as 1- or 3-channel, 8-bit or 32-bit floating point. |
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:param dst: Accumulator image with the same number of channels as input image, 32-bit or 64-bit floating-point. |
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:param alpha: Weight of the 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 ``src`` and the accumulator ``dst`` so that ``dst`` becomes a running average of a frame sequence: |
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.. math:: |
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\texttt{dst} (x,y) \leftarrow (1- \texttt{alpha} ) \cdot \texttt{dst} (x,y) + \texttt{alpha} \cdot \texttt{src} (x,y) \quad \text{if} \quad \texttt{mask} (x,y) \ne 0 |
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That is, ``alpha`` regulates the update speed (how fast the accumulator "forgets" about earlier images). |
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The function supports multi-channel images. Each channel is processed independently. |
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See Also: |
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:func:`accumulate`, |
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:func:`accumulateSquare`, |
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:func:`accumulateProduct` |