How can i crop images from multiple folders that are located under one main folder to a specific size before i feed it through a CNN?

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Rana Jud 2020-6-21

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评论： sania urooj 2021-2-12

采纳的回答： Raunak Gupta

categories = {'Cardiomegaly','Infiltration', 'No Finding'};

rootFolder = 'C:\Users\roro\Downloads\Data';

imds = imageDatastore(fullfile(rootFolder, categories), ...

'LabelSource', 'foldernames');

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Answer 1

Raunak Gupta 2020-6-24

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Hi,

You can use augmentedImageDatastore to augment the images read by imageDatastore. The cropping function can be achieved using the OutputSizeMode as ‘centercrop’. You may ‘randcrop’ also if you want cropping to be random instead of focusing at center. Below code might help.

rootFolder = 'C:\Users\roro\Downloads\Data'; 
imds = imageDatastore(fullfile(rootFolder, categories), ... 
     'LabelSource', 'foldernames'); 
% imageSize must be defined according to the final cropped image size 
imageSize = [28 28 1]; 
augimds = augmentedImageDatastore(imageSize,imds,'OutputSizeMode','centercrop'); 