imshow command will not display my images

Question

Kyle Davis 2019-1-29

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/442024-imshow-command-will-not-display-my-images

编辑： Stephen23 2019-1-29

Hi all, I am currently trying to randomly present 21 images, one after the other, all located within the same folder. When I run my code, Matlab does not display any errors, but no images are shown either. I currently have the following code;

dirname= 'C:\Users\User\Documents\MATLAB\stimuli\';
d=dir([dirname '*.jpg']);
for i= randperm(numel(d))
    imshow(d(i).name)
    pause(2);
end

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Answer 1

KSSV 2019-1-29

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https://ww2.mathworks.cn/matlabcentral/answers/442024-imshow-command-will-not-display-my-images#answer_358465

在 MATLAB Online 中打开

d=dir([dirname '*.jpg']);
for i= randperm(numel(d))
    I = imread(d(i).name) ;
    imshow(I)
    pause(2);
end

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Stephen23 2019-1-29

编辑：Stephen23 2019-1-29

Note that imshow accepts a filename as its first inpout argument. Using another image display function does not resolve the actual issue with the code in the question (the missing path).

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Answer 2

Walter Roberson 2019-1-29

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https://ww2.mathworks.cn/matlabcentral/answers/442024-imshow-command-will-not-display-my-images#answer_358471

在 MATLAB Online 中打开

dirname= 'C:\Users\User\Documents\MATLAB\stimuli\';
d=dir(fullfile(dirname, '*.jpg'));
for i = randperm(numel(d))
    imshow( fullfile(dirname, d(i).name) )
    pause(2);
end

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Answer 3

Stephen23 2019-1-29

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/442024-imshow-command-will-not-display-my-images#answer_358472

编辑：Stephen23 2019-1-29

The reason is very simple: you forgot to use the path when you tried to read the file:

D = 'C:\Users\User\Documents\MATLAB\stimuli';
S = dir(fullfile(D,'*.jpg'));
for k = randperm(numel(S))
    imshow(fullfile(D,S(k).name))
    pause(2);
end

Note that it is recommended to avoid using i for a loop iterator, as this is the name of the imaginary unit. Using fullfile is recommended instead of string concatenation:

https://www.mathworks.com/help/matlab/ref/fullfile.html