reading multiple images from a folder in Matlab
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yasmine
am 7 Nov. 2011
Kommentiert: Emily Leung
am 18 Jun. 2021
I want to read many images from a folder in the Matlab directory using imread() and then make different operations in every image individually , i wrote this code but it disagrees about (+k+):
num_file=1;
file = dir('image.orig');
num_file = numel(file);
NF=num_file;
Y=1;Z=1;
images = cell(1,NF,T);
T=cell(Y,Z,3);
for k = 1:NF
images{1,k}(Y,Z,3) = imread('C:Work\image.orig\'+k-1+'.JPEG');
end
also, i want to save the matrix of each image in a cell array and i don't if what i wrote is right or not and i cannot have a permission to read from the folder, i checked the folder and found that it is read only, what do you think?
Thank you in advance
0 Kommentare
Akzeptierte Antwort
Walter Roberson
am 7 Nov. 2011
file = dir('image.orig');
NF = length(file);
images = cell(NF,1);
for k = 1 : NF
images{k} = imread(fullfile('image.orig', file(k).name));
end
8 Kommentare
Walter Roberson
am 10 Nov. 2011
I would put a breakpoint in and check each step -- for example, does file come out empty?
Check to be sure that you have not accidentally created your own dir.m or imread files:
which -all dir
which -all imread
Weitere Antworten (4)
Image Analyst
am 8 Nov. 2011
It's always worth throwing in a plug for the FAQ: http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F
0 Kommentare
yasmine
am 8 Dez. 2011
6 Kommentare
Walter Roberson
am 9 Dez. 2011
I think this should definitely have gone in its own thread ;-)
You are trying to apply imhist() to a (subsection of) a truecolor image (which is thus a 3D matrix). imhist() is only for grayscale images. You should convert your whole image to grayscale before you break it up in to blocks; or you should convert each block to grayscale and imhist that as you go; or you should imhist() each of the three color planes separately.
Shaveta Arora
am 9 Apr. 2016
If I have .tiff images and .tif images that I want to read, how they can be read ? I know how to read one type of images but how to read two types of images.
4 Kommentare
Walter Roberson
am 18 Jun. 2021
@Emily LeungIn the code I posted here, the filenames would come up empty if you do not have any .tif or .tiff files in the current directory.
In some cases, depending upon operating system configuration, files ending with extension .TIF or .TIFF might not be treated as if they ended in .tif or .tiff -- sometimes files are case sensitive.
The code I posted is not designed to look for files in a different directory; the changes to look in a different directory are not difficult though.
Emily Leung
am 18 Jun. 2021
@Walter Roberson i solved the issue, thank you very much this approach saved me many an if loop!
Kumar Vaibhav
am 1 Aug. 2016
Bearbeitet: Walter Roberson
am 1 Aug. 2016
I=imread(sprintf('C:/Users/kumar.vaibhav/Documents/MATLAB/Visually Similar Images/%d.jpeg',i));
1 Kommentar
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