how to load random image from folder
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Hello. I have 4 images in 1 folder and I have to load them randomly. I tried to do this.
>> a=dir(['C:\Users\Desktop\Crossroad\vehicles' '/*.png'])
and then randomly load one of 4 images
im=imread(a(randi(4)).name)
but matlab gives me an error:
Error using imread (line 349)
File "white_car.PNG" does not exist.
It. wrotes that files doesnt exist, but it actually does..Does anyone know how to write it properly? Many thanks.
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Image Analyst
2020-4-12
You need to use fullfile because a(index).name does not include the folder.
folder = 'C:\Users\Desktop\Crossroad\vehicles'
fileList = dir(fullfile(folder, '/*.png'))
randomIndex = randi(length(fileList), 1, 1) % Get random number.
fullFileName = fullfile(folder, fileList(randomIndex).name)
img = imread(fullFileName);
5 个评论
Miroslav Jiránek
2020-4-12
Adam Bodis
2021-3-22
Error using randi
First input must be a positive scalar integer value IMAX, or two integer values [IMIN IMAX] with IMIN less than or equal to IMAX.
Error in sem_praca_bodis (line 13)
randomIndex = randi(length(fileList), 1, 1); % Get random number.
i have this type of error. Any help please?
Image Analyst
2021-3-22
fileList is empty and so the length of it is zero. You must give a file name pattern to dir() that will load the variable with some file information.
ANKIT MAURYA
2023-1-14
What if i need to present randomly different images on different trials from a set of pictures stored in a folder ?
Image Analyst
2023-1-14
sortOrder = randperm(numel(fileList));
unless you want to allow repeats, then use randi.
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