Could you explain the following code to enhance an image? "1./(1+exp​(0.03*(-ba​se_layer*2​55+170)))"

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Dhanubala A
Dhanubala A on 30 Jan 2018
Answered: Walter Roberson on 30 Jan 2018
I found this
(1./(1+exp(0.03*(-base_layer*255+170))))
code in order to enhance an image. But, I could not understand how this works. I couldn't understand the term '170' and '0.03'used here.can you please explain this?

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Accepted Answer

Walter Roberson
Walter Roberson on 30 Jan 2018
That appears to be a sigmoid; see https://www.mathworks.com/examples/matlab/community/20079-sigmoid-documentation for some information about sigmoids.

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