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histogram from image results in a straight vertical line

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dannnyds

Electrical
Nov 16, 2010
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AU
I've only just started using simulink and I've got a bit of a problem where i take an image (color), convert it to an intensity image and try to make a histogram of this image.

the first two parts work but for some reason the histogram block always gives me a straight vertical line. the output of the RGB to intensity is also confusing me a little as its the correct gray image, but if i use a display block every entry is a 255.

sorry for the noob question
danny
 
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