Why the image is upside down when I display it in a graph?

Question

afrya 2014-1-7

1
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https://ww2.mathworks.cn/matlabcentral/answers/111668-why-the-image-is-upside-down-when-i-display-it-in-a-graph

评论： Image Analyst 2014-1-13

采纳的回答： Mischa Kim

在 MATLAB Online 中打开

Hello,

I have a problem when I display an image in a plot.The image is upside down in the figure window.

Do you know how to fix this problem?

here is my code to display the image in the graph:

% Load the image

img = imread('KAM-Map_12s.bmp');

hold on;

% Plot the image, with x and y coordinnates

image([150 350],[4 4.7],img);

Thanks in advance

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Answer 1

Mischa Kim 2014-1-13

3
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https://ww2.mathworks.cn/matlabcentral/answers/111668-why-the-image-is-upside-down-when-i-display-it-in-a-graph#answer_120771

编辑：Mischa Kim 2014-1-13

在 MATLAB Online 中打开

Simply add (only)

set(gca,'YDir','reverse');

In other words, try

img = imread('KAM-Map_12s.bmp');
hold on;
image([150 350],[4 4.7],img);
set(gca,'YDir','reverse');

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Answer 2

afrya 2014-1-13

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thanks for your answer.The image is now in the right order But I still have a problem, when I add set(gca,'YDir','reverse') in my code, the graph is also reversed.

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Answer 3

Image Analyst 2014-1-7

1
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The direction of the y axis is reversed from regular graphs since the convention is that the top of the image is line 1 and line numbers increase as you go down. You can set ydir to 'reverse' or call flipud(imageArray).