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error in converting image to binary

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FIR
FIR 2012-3-1
I have a rgb image inwhich the image consists of two persons,i want to make the background black and persons in white colour,i tried im2bw but i get only whit backgroubf,no image duisplayed ,please help

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回答（2 个）

Pugazhendhi
Pugazhendhi 2012-3-1
First convert to grayscale(rgb2gray) then use im2bw
Walter Roberson
Walter Roberson 2012-3-1
See graythresh()

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