基于背景建模方法处理视频（常用的函数）

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1、将帧叠加到累积器（accumulator）中

C++: void accumulate(InputArray src, InputOutputArray dst, InputArray mask=noArray() )

C: void cvAcc(const CvArr* image, CvArr* sum, const CvArr* mask=NULL )

Parameters:

src – Input image as 1- or 3-channel, 8-bit or 32-bit floating point.
dst – Accumulator image with the same number of channels as input image, 32-bit or 64-bit floating-point.
mask – Optional operation mask.

The function adds src or some of its elements to dst :

$\texttt{dst} (x,y) \leftarrow \texttt{dst} (x,y) + \texttt{src} (x,y) \quad \text{if} \quad \texttt{mask} (x,y) \ne 0$

The function supports multi-channel images. Each channel is processed independently（函数支持多通道图像。每个通道单独处理）。

2、用来更新移动平均

C++: void accumulateWeighted(InputArray src, InputOutputArray dst, double alpha,InputArray mask=noArray() )

C: void cvRunningAvg(const CvArr* image, CvArr* acc, double alpha, const CvArr* mask=NULL )

Parameters:

src – Input image as 1- or 3-channel, 8-bit or 32-bit floating point.
dst – Accumulator image with the same number of channels as input image, 32-bit or 64-bit floating-point.
alpha – Weight of the input image.
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:

$\texttt{dst} (x,y) \leftarrow (1- \texttt{alpha} ) \cdot \texttt{dst} (x,y) + \texttt{alpha} \cdot \texttt{src} (x,y) \quad \text{if} \quad \texttt{mask} (x,y) \ne 0$

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