what is the difference in usage between function im2bw(Image) and im2bw(Imag​e,graythre​sh(Image))​?

2017 9 19
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I used the default of the function im2bw without additional parameter, and I used im2bw by adding Otsu threshold to the function im2bw. I need to learn what the default value of threshold that used in default im2bw?

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