mirror of
https://github.com/opencv/opencv.git
synced 2024-11-30 06:10:02 +08:00
119 lines
4.1 KiB
ReStructuredText
119 lines
4.1 KiB
ReStructuredText
Motion Analysis and Object Tracking
|
|
===================================
|
|
|
|
.. highlight:: cpp
|
|
|
|
.. index:: accumulate
|
|
|
|
accumulate
|
|
--------------
|
|
.. cpp:function:: void accumulate( InputArray src, InputOutputArray dst, InputArray mask=noArray() )
|
|
|
|
Adds an image to the accumulator.
|
|
|
|
:param src: Input image as 1- or 3-channel, 8-bit or 32-bit floating point.
|
|
|
|
:param dst: Accumulator image with the same number of channels as input image, 32-bit or 64-bit floating-point.
|
|
|
|
:param mask: Optional operation mask.
|
|
|
|
The function adds ``src`` or some of its elements to ``dst`` :
|
|
|
|
.. math::
|
|
|
|
\texttt{dst} (x,y) \leftarrow \texttt{dst} (x,y) + \texttt{src} (x,y) \quad \text{if} \quad \texttt{mask} (x,y) \ne 0
|
|
|
|
The function supports multi-channel images. Each channel is processed independently.
|
|
|
|
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.
|
|
|
|
See Also:
|
|
:cpp:func:`accumulateSquare`,
|
|
:cpp:func:`accumulateProduct`,
|
|
:cpp:func:`accumulateWeighted`
|
|
|
|
.. index:: accumulateSquare
|
|
|
|
accumulateSquare
|
|
--------------------
|
|
.. cpp:function:: void accumulateSquare( InputArray src, InputOutputArray dst, InputArray mask=noArray() )
|
|
|
|
Adds the square of a source image to the accumulator.
|
|
|
|
:param src: Input image as 1- or 3-channel, 8-bit or 32-bit floating point.
|
|
|
|
:param dst: Accumulator image with the same number of channels as input image, 32-bit or 64-bit floating-point.
|
|
|
|
:param mask: Optional operation mask.
|
|
|
|
The function adds the input image ``src`` or its selected region, raised to power 2, to the accumulator ``dst`` :
|
|
|
|
.. math::
|
|
|
|
\texttt{dst} (x,y) \leftarrow \texttt{dst} (x,y) + \texttt{src} (x,y)^2 \quad \text{if} \quad \texttt{mask} (x,y) \ne 0
|
|
|
|
The function supports multi-channel images Each channel is processed independently.
|
|
|
|
See Also:
|
|
:cpp:func:`accumulateSquare`,
|
|
:cpp:func:`accumulateProduct`,
|
|
:cpp:func:`accumulateWeighted`
|
|
|
|
.. index:: accumulateProduct
|
|
|
|
accumulateProduct
|
|
---------------------
|
|
.. cpp:function:: void accumulateProduct( InputArray src1, InputArray src2, InputOutputArray dst, InputArray mask=noArray() )
|
|
|
|
Adds the per-element product of two input images to the accumulator.
|
|
|
|
:param src1: The first input image, 1- or 3-channel, 8-bit or 32-bit floating point.
|
|
|
|
:param src2: The second input image of the same type and the same size as ``src1`` .
|
|
|
|
:param dst: Accumulator with the same number of channels as input images, 32-bit or 64-bit floating-point.
|
|
|
|
:param mask: Optional operation mask.
|
|
|
|
The function adds the product of 2 images or their selected regions to the accumulator ``dst`` :
|
|
|
|
.. math::
|
|
|
|
\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
|
|
|
|
The function supports multi-channel images. Each channel is processed independently.
|
|
|
|
See Also:
|
|
:cpp:func:`accumulate`,
|
|
:cpp:func:`accumulateSquare`,
|
|
:cpp:func:`accumulateWeighted`
|
|
|
|
.. index:: accumulateWeighted
|
|
|
|
accumulateWeighted
|
|
----------------------
|
|
.. cpp:function:: void accumulateWeighted( InputArray src, InputOutputArray dst, double alpha, InputArray mask=noArray() )
|
|
|
|
Updates a running average.
|
|
|
|
:param src: Input image as 1- or 3-channel, 8-bit or 32-bit floating point.
|
|
|
|
:param dst: Accumulator image with the same number of channels as input image, 32-bit or 64-bit floating-point.
|
|
|
|
:param alpha: Weight of the input image.
|
|
|
|
:param mask: Optional operation mask.
|
|
|
|
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:
|
|
|
|
.. math::
|
|
|
|
\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
|
|
|
|
That is, ``alpha`` regulates the update speed (how fast the accumulator "forgets" about earlier images).
|
|
The function supports multi-channel images. Each channel is processed independently.
|
|
|
|
See Also:
|
|
:cpp:func:`accumulate`,
|
|
:cpp:func:`accumulateSquare`,
|
|
:cpp:func:`accumulateProduct` |