You can load it into the single file that may consists of several subfiles or classes. You then need PCA to perform normalization and dimension reduction, see e.g., https://au.mathworks.com/matlabcentral/answers/445906-pca-in-matlab-reduce-dimensionality

https://au.mathworks.com/help/stats/referencelist.html?type=function&category=dimensionality-reduction&s_tid=CRUX_topnav

Hi! MATLAB's imread function can be used to import image data. Here is an illustration of how to apply it:

img = imread('image.jpg');

Use the imresize function to resize an image. Here is an illustration of how to apply it:

img_resized = imresize(img, [200 300]);

You can divide each pixel value by the highest possible pixel value, which is typically 255 for 8-bit images, to normalize the pixel values of an image. As an illustration, consider the following:

img_normalized = img_resized / 255;

Keep in mind that in order to utilize these functions, the Image Processing Toolbox must be installed and added to your MATLAB path.

merci