Different results (foreground image) in MOG2 in 2.4.2~2.4.6

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Hi everyone, I used MOG2() to train/Learn 10 images and got the model. Use this model to detect current image in order to get foreground image. (When Training, Learning rate = 0.1; when Detecting, Learning rate = 0).

But I've discovered that it has different results (foreground images) in continuous 2 detection with the same MOG2 trained model. It has tiny difference between these 2 result images!!

But why ? I use the same MOG2 model to calculate it...

The 2 different results of the foreground image are displayed in the attached images. C:\fakepath\gmmfault.bmp (I am sure that the input image is the same when detecting) It looks like something wrong in the first 2 computation.

Greetings, Vio