On Amplitude and Phase in Printed Characters
Volume 4, Issue 2
Bernt C. Skottun, Skottun Research, Peidmont, CA
The purpose of the project described here is to provide a graphic demonstration
of the role of phases and amplitudes in determining the appearance of printed
characters. The images of two printed characters are Fourier analyzed and
the amplitude spectrum of one is combined with the phase spectrum of the
other. In the resulting hybrid image, one can clearly recognize the letter
whose phase spectrum is used, while no trace of the other letter is evident.
This procedure is also carried out with letters of different fonts and
sizes. Again, the resulting images are mainly determined by the phase spectra.
However, with letters of different sizes, the amplitude spectra, as one
might expect, influence the appearance.
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