[Python] How to randomly select a pixel within a kernel and attribute its value to the center...

In order to investigate whether the decisions of a CNN for image classification are predominantly driven by image regions related to relatively fine object features, I am looking for an image pertubation technique that allows for a local disturbance of groups of pixels while retaining the general structure of the displayed object.

In this regard I was thinking about using a moving kernel (similar to a mean filter) in which I randomly select the value of one pixel within the kernel and attribute it to the center pixel. By gradually increasing the kernel size I am aiming to introduce varying levels of disturbance.

How can I effectively randomly select a pixel in a kernel and attribute its value to the center pixel using Python?

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