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Problem with imhist after modify image

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Dani D
Dani D 2016-3-11
评论： Zahra Saman 2018-4-12
Hello, Why After histogram in 0 to 1 range?
I=imread('cameraman.tif');
figure
subplot(2,2,1);
imshow(I);
title('Original');
subplot(2,2,2);
imhist(I);
title('Original Histogram');
I=double(I);
fis=readfis('FIS4');
[m n]=size(I);
for i=1:m
for j=1:n
I(i,j)=evalfis(I(i,j),fis);
end
end
subplot(2,2,3);
imshow(uint8(I));
title('After');
subplot(2,2,4);
imhist(I);
title('After Histogram');

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回答（2 个）

Ahmet Cecen
Ahmet Cecen 2016-3-11
For now use:
imhist(uint8(I))
That will get your work done, although it puzzles me why that is necessary, because imhist normally accepts double.
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rjvyas
rjvyas 2017-10-6
I had the same problem and using imhist(uint8(I)) worked! Thank you
Image Analyst
Image Analyst 2017-10-6
You can also use histogram:
histogram(I);
which doesn't require conversion to integer.

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Julie
Julie 2016-3-11
It changed the range, sometimes it does grayscale in 0-255, and sometimes it does it in 0-1. It won't make a difference to your image. To fix your histogram use
imhist(I.*255);

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