A kernel is a function that acts as a parameter that is passed to some algorithm. For example, the two dimensional Gaussian kernel is often used as a parameter for low pass filtering in image processing.

A kernel is a function that acts as a parameter that is passed to some algorithm.

For example, the two dimensional Gaussian kernel is often used as a parameter for low pass filtering in image processing. Sometimes, the kernel in image processing takes the form of a constant matrix, such as the following $5\times 5$ convolution kernel.

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