How create desired number of images in the folder

How to augment a folder of images?

Suppose i have 7 images in a folder, i wanted to augment these 7 images and create a total of 20 images in the folder (that means 13 new images)

I tried the below code for 1 image

In = imread('peppers.png');
Aug = imageDataAugmenter('RandXReflection',true);
Out = augment(Aug,In);

How to augment, so that i can create desired number of images in the folder

Answer 1

[Constantino Carlos Reyes-Aldasoro]

Hello

First of all, if you have folders you better define these:

baseDir = pwd;

that is the base folder or directory, then define the files you have in that folder, if these are png you can just read those:

>> dir0 = dir ('*.png')
dir0 = 
  11×1 struct array with fields:
    name
    folder
    date
    bytes
    isdir
    datenum

Now you have all the files in that folder and you do not need to write them one by one, e.g.

>> dir0(1).name
ans =
    'Image_0.png'

Then you do the augmentation and then save the images to the folder, create a new filename for your output and print to save in the folder where you are working:

    filename='Image_0_rotated.png';
    print('-dpng','-r100',filename)

Hope that helps. If it does, please accept the answer, if it not, let me know.

[Elysi Cochin]

If i want 10 new images from a single image, how can i specify the number of new images i want?

[Constantino Carlos Reyes-Aldasoro]

That is easy, just add the number to the filename e.g.

for k=1:10
    filename=strcat('Image_',num2str(k),'_rotated.png');
    disp (filename)
end

Image_1_rotated.png
Image_2_rotated.png
Image_3_rotated.png
Image_4_rotated.png
Image_5_rotated.png
Image_6_rotated.png
Image_7_rotated.png
Image_8_rotated.png
Image_9_rotated.png
Image_10_rotated.png

[Elysi Cochin]

sir, how to use it in image augmentation function?

[Constantino Carlos Reyes-Aldasoro]

That depends on what you want to do to augment, you can use the same for loop and then use the values as parameters to your function:

https://uk.mathworks.com/help/deeplearning/ref/imagedataaugmenter.html

[Constantino Carlos Reyes-Aldasoro]

I would suggest to make the changes INSIDE the loop so that you change the parameters automatically.