How to read and display multiple images in matlab

Question

DSB 2017-3-10

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/329172-how-to-read-and-display-multiple-images-in-matlab

编辑： Image Analyst 2017-3-10

在 MATLAB Online 中打开

Hi there

I'm trying to read an images from the folder using for loop but when i run the code it doesn't work

Here is my code:

folder='Documents/MATLAB/*.png' ;

I=dir(fullfile(folder,'*.png'));

for k=1:numel(I)

filename=fullfile(folder,I(k).name);
a=imread(filename);

end

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Adam 2017-3-10

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/329172-how-to-read-and-display-multiple-images-in-matlab#answer_258157

在 MATLAB Online 中打开

http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F

Your code is equivalent to:

fullfile( 'Documents/MATLAB/*.png', '*.png' );

which is clearly not going to resolve to something sensible. dir just needs a folder given to it, not filenames with extensions.

2 个评论
显示无隐藏无

Guillaume 2017-3-10

编辑：Guillaume 2017-3-10

Well, actually in R2016b, the above would be a valid string to pass to dir. However, it is extremely unlikely to find anything and is most certainly not what is intended.

It would find all files and folders ending in .png in all immediate subfolders of Documents/MATLAB/ ending in .png. While windows allows dots in folder names, it's an unusual thing to do.

Adam 2017-3-10

Useful to know. I've only used dir on folders so far!

请先登录，再进行评论。

Answer 2

Thorsten 2017-3-10

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/329172-how-to-read-and-display-multiple-images-in-matlab#answer_258163

编辑：Thorsten 2017-3-10

在 MATLAB Online 中打开

Try

folder='Documents/MATLAB/';

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

Answer 3

Image Analyst 2017-3-10

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/329172-how-to-read-and-display-multiple-images-in-matlab#answer_258197

编辑：Image Analyst 2017-3-10

RGB_Histogram_Demo.m

Like Adam said, see the FAQ for two code samples: http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F

A glaring problem with your code is the lack of any way to show/display the images. There is no imshow(a) in your loop. Other problems include no using "drawnow" to see the images after each one, otherwise you'll just see the last images. And using horrible variable names like the badly-named a.

See attached demo.