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WebTriangle smoothing is rectangle smoothing done twice. For a mathematical description of the triangle filter, we simply square equation ( 10 ). Convolving a rectangle function with itself many times yields a result that mathematically tends towards a Gaussian function. Despite the sharp corner on the top of the triangle function, it has a shape ... WebMultiple-pass moving average filters involve passing the input signal through a moving average filter two or more times. Figure 15-3a shows the overall filter kernel resulting from one, two and four passes. Two passes are equivalent to using a triangular filter kernel (a rectangular filter kernel convolved with itself). homes built prior to 1978

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