jay_singh asked . 2021-07-27

What is per-pixel mean?

To train the CNN, RGB images(in some cases color-ROI) are preprocessed by resizing it to the smallest dimension to 256, and then we crop center 256*256 region. After this per-pixel mean(across all the image) is subtracted.

I don't get a proper sense of this concept. Is there anyone can explain?

digital image proc... , neural networks

Expert Answer

Kshitij Singh answered . 2024-11-13 18:15:57

You have a whole series of extracted images that are the same size. The per-pixel mean over the images is the mean across all the pixels for any one fixed location. So for example if the extract images are stored in AllImages,

mean(AllImages(17, 38, :))

would be the per-pixel mean for location (17, 38)

You can do this all at one time for the pixels by using

mean(AllImages, 3)

where the 3 indicates the third dimension, provided that the different images are stored as having a different third-dimensional coordinate in the array.

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