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pls help me urgent!!! figure showing for a image vector

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inter steller
inter steller 2015-2-11
关闭： Walter Roberson 2015-8-6
for a simply example like below:
I = rgb2gray(imread('1231.png'));
g=find(I<180);
ft=g*0.9
sx=find(I(g)>ft);
now i nid to show a figure for sx, anyone can teach me?

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