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2015-10-26 09:55:53 -0600 asked a question DFT coordinate system

In the implementation of DFT(for 2D) in opencv what coordinate system they use(Cartesian coordinate system or 2D array like coordinate system)?

(-1, 1)(0, 1)(1, 1)
(-1, 0)(0, 0)(1, 0)
(-1,-1)(0,-1)(1,-1)

(0,0)(0,1)(0,2)
(1,0)(0,1)(0,2)
(2,0)(0,1)(0,2)

2015-10-26 09:55:46 -0600 asked a question Coordinate system in DFT()

What is the coordinate system used in DFT implementation out of followings? Or does that really matter?

(-1, 1)(0, 1)(1, 1)
(-1, 0)(0, 0)(1, 0)
(-1,-1)(0,-1)(1,-1)

(0,0)(0,1)(0,2)
(1,0)(0,1)(0,2)
(2,0)(0,1)(0,2)