how can I use fuzzy c means clustering and membership function instead of threshold?

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Bibhu Prasad Das 2017-4-13

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https://ww2.mathworks.cn/matlabcentral/answers/335147-how-can-i-use-fuzzy-c-means-clustering-and-membership-function-instead-of-threshold

Lets say I want to detect a moving object in 20 frames, I will perform difference of frames and apply a threshold to the difference and conclude if the difference is greater than the threshold we detect a moving object(foreground) else background. Here I want to replace that threshold with fuzzy membership function by apply fuzzy c-means clustering by creating two clusters and finally applying a membership function.