Convolution is particularly useful in signal analysis. See related link.
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Convolution in the time domain is equivalent to multiplication in the frequency domain.
You can use ImageMagick library and use 'convolve' function.
+ addition - subtraction* multiplication
Multiplication is an addition 'that' number of times. 3*3 = 9 3+3+3 = 9
Multiplication, division and modulo all have equal precedence.