Why titles are flipped vertically in the following code?

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soe
soe 2018-12-31
评论： Snehil Singh 2021-5-2
%Please change the file formats into tif first
clear;
clc;
close all;
I=imread('Fig0316(1)(top_left).tif');
I1=imread('Fig0316(2)(2nd_from_top).tif');
I2=imread('Fig0316(3)(third_from_top).tif');
I3=imread('Fig0316(4)(bottom_left).tif');
[nk, rk]=imhist(I);
[nk1, rk1]=imhist(I1);
[nk2, rk2]=imhist(I2);
[nk3, rk3]=imhist(I3);
figure('Name','Images with different contrast','NumberTitle','off');
subplot(2,4,1)
imshow(I);
title('Brighter Image');
subplot(2,4,2)
imshow(I1);
title('Low Contrast Image');
subplot(2,4,3)
imshow(I2);
title('High Contrast Image');
subplot(2,4,4)
imshow(I3);
title('Darker Image');
subplot(2,4,5)
bar(rk,nk);
title('histogram for Brigher Image');
subplot(2,4,6)
bar(rk1,nk1);
title('histogram for Low Contrast Image');
subplot(2,4,7)
bar(rk2,nk2);
title('histogram for High Contrast Image');
subplot(2,4,8)
bar(rk3,nk3);
title('histogram for Darker Image');
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Snehil Singh
Snehil Singh 2021-5-2
'imhist' requires Image Processing Toolbox.
Error in Untitled3 (line 8)
[nk, rk]=imhist(I);
How to resolve this error

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采纳的回答

Cris LaPierre
Cris LaPierre 2019-1-1
That's weird. It's not a common issue - it'd be all over the place if it were. After some searching, I found this post saying there can be issues with some ATI graphics cards. Try the suggestions there (updating graphics drivers, switching renderer) and let us know if that solved the problem.

更多回答（1 个）

soe
soe 2019-1-2
Thank you so much!
opengl('software') command has solved my problem!

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