Updates a running average

dst = cv.accumulateWeighted(src, dst, alpha)
dst = cv.accumulateWeighted(..., 'OptionName',optionValue, ...)

Input

• src Input image as 1- or 3-channel, 8-bit or 32-bit floating point.
• dst Input accumulator image with the same number of channels as input image, 32-bit or 64-bit floating-point.
• alpha Weight of the input image. A scalar double.

Output

• dst Output accumulator image.

Options

• mask Optional operation mask. Not set by default

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:

dst(x,y) = (1-alpha)*dst(x,y) + alpha*src(x,y)  if mask(x,y)~=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.