A box blur is an image filter in which each pixel in the resulting image has a value equal to the average value of its neighboring pixels in the input image. As such it is a low-pass ("bluring") filter and is a convolution. In mathematics and, in particular, functional analysis, convolution is a mathematical operator which takes two functions f and g and produces a third function that in a sense represents the amount of overlap between f and a reversed and translated version of g. ...
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