how to load random image from folder

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Miroslav Jiránek
Miroslav Jiránek 2020-4-12
评论： Image Analyst 2023-1-14
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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采纳的回答

Image Analyst
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);
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ANKIT MAURYA
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
Image Analyst 2023-1-14
@ANKIT MAURYA use randperm
sortOrder = randperm(numel(fileList));
unless you want to allow repeats, then use randi.

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