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bwareaopen for connverting RGB to binary

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Tulips
Tulips 2012-10-29
hi sir, may I know how to assign the conversion of rgb to binary. for instance,, I've used this coding but the output is all black,why is that:
%%Binary
im=uint(im)
figure;imshow(im,[])
%%remove pxls less than 100
pixels=100;
detectObject=uint8(bwareaopen,pixels)
figure;imahow(detectObject,[])

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