What leads to the presence of twin images in electron holography?

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Thomas Walther

The FFT or an image I(x,y) and its mirror twin I'(x,y)=I(-x,-y) have exactly the same modulus and thus power spectra. The phase angles either remain (cos -> cos) or are mirrored as well (sin ->-sin) and so if you measure amplitude and phase angle and for the latter don't know the signs then the two mirror twins are indistinguishable.

Ganapathi Prabhu Sai Balasubramanian

Thanks Thomas for your response.