2D sampling
24 Fevereiro 2023, 12:00 • José Manuel Rebordão
2D
Sampling. Main equations of Shannon theory. Artifacts in case of
non-band-limited function or disrespect of Nyquist frequency.
Superposition
of periodic patters. Analysis in direct and Fourier space.
Visual
band: reference to the MTF and to the Contrast Sensitivity Function.
Emergence
of low frequencies from linear
combinations of pattern-related frequencies.
Stables
and unstable superpositions.
Applications:
Hidden indicia, printing, security.
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