The frequency and direction of the 2D DFT of an image are available on the
FFT plot, which indicates the frequency as r in pixels/cycle, and the direction in degrees as theta (\theta).
On the other hand, the amplitude and phase can be retrieved on the
Complex plot, at any point in the (x,y) coordinate system. The complex plot comes stacked-up in its **Re**al and **Im**aginary components.
This is explained by Herbie here.
The (apparent… well… my) problem is that both plots (
Complex) appear on the screen separately. So if I want to gather the four values of the 2D DFT for a given point I need to first point-select on the
FFT plot, which will print out the corresponding frequency and direction values, together with the Cartesian coordinates of the point ( (167, 119) in the animated GIF below), and then go fishing over the
Complex plot for the point in question by hovering over, and keeping a steady hand, until the correct value appears on the display.
I have tried stacking up both plots (
Complex) without success.
The question is: Is there a way to select a point in both the
FFT plot and the
Complex plot simultaneously, or somewhat more expeditiously?
Here is an illustration of the problem: