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    .Functions and classes described in this section are used to perform various linear or non-linear filtering operations on 2D images represented as.Mat .s that is for each pixel location..in the source image some its normally rectangular neighborhood is considered and used to compute the response. Normally the functions supports multi-channel arrays in which case every channel is processed independently therefore the output image will also have the same number of channels as the input one..Another common feature of the functions and classes described in this section is that unlike simple arithmetic functions they need to extrapolate values of some non-existing pixels.

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