Creates KNN Background Subtractor

bs = cv.BackgroundSubtractorKNN()
bs = cv.BackgroundSubtractorKNN('OptionName', optionValue, ...)

Options

• History Length of the history. default 500
• Dist2Threshold Threshold on the squared distance between the pixel and the sample to decide whether a pixel is close to that sample. This parameter does not affect the background update. default 400.0
• DetectShadows If true, the algorithm will detect shadows and mark them. It decreases the speed a bit, so if you do not need this feature, set the parameter to false. default true