Class FrameDifferencer
source code
AbstractBGModel --+
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FrameDifferencer
This class is useful for simple N-frame differencing method of
background subtraction. If you have a stationary camera, this can be a
simple and effective way to isolate people/moving objects from the
background scene.
FrameDifferencer uses ImageBuffer for operation. Assume the buffer
size is 5. The output of the frame differencing operation will be based
on the middle image, the 3rd in the buffer. The output is the
intersection of the following two absolute differences: abs(Middle-First)
AND abs(Last-Middle).
__init__(self,
imageBuffer,
thresh=20,
soft_thresh=False)
(Constructor)
| source code
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- Parameters:
imageBuffer - An ImageBuffer object that has already been filled with the
appropriate number of images. (Provide a full buffer...so a few
frames of initialization will be required in most cases to fill
up a newly created buffer.)thresh - A noise threshold to remove very small differences. - Overrides:
AbstractBGModel.__init__
- (inherited documentation)
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This private method should be overridden by a concrete background
subtraction class to yield a difference image from the background
model.
- Overrides:
AbstractBGModel._computeBGDiff
- (inherited documentation)
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