What is per-pixel mean?

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jay_singh - 2021-07-27T12:37:11+00:00
Question: 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?

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    • Expert Answer

    Profile picture of Kshitij Singh Kshitij Singh answered . 2025-11-20

    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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