Calculates weighted sum of input image image and the accumulator acc so that acc becomes a running average of frame sequence:
acc(x,y)=(1-alpha) * acc(x,y) + alpha * image(x,y) if mask(x,y)!=0
where alpha regulates update speed (how fast accumulator forgets about previous frames).

C# | Visual Basic | Visual C++ |

- image (IntPtr)
- Input image, 1- or 3-channel, 8-bit or 32-bit floating point (each channel of multi-channel image is processed independently).
- acc (IntPtr)
- Accumulator of the same number of channels as input image, 32-bit or 64-bit floating-point.
- alpha (Double)
- Weight of input image
- mask (IntPtr)
- Optional operation mask