Shift invariance (Spatial invariance)

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Shift Invariance simply refers to the 'invariance' that a CNN has to recognising images. It allows the CNN to detect features/objects even if it does not look exactly like the images in it's training period. Shift invariance covers 'small' differences, such as movements shifts of a couple of pixels.

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How does it work or a deeper look

  • Due to pooling/max pooling it is acceptable that shift invariance only covers such small changes. This is because pooling already strips the image away of it's useless features, and gives a compressed version of the input. As such if there is 50 pixels of white space to the left in one version of the input, and 70 pixels in another version, the image that gets processed would be the same, as pooling would get rid of the white space


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