Sampling model — formula?
Discrete sampled function: $f_d(m,n)=f(m riangle x,n riangle y)$.
Discrete sampled function
Sampled at regular grid points in space.
Aliasing — cause?
Under-sampling causes high frequencies to appear as low ones.
Aliasing
Falsely low frequency artefacts from under-sampling.
Nyquist theorem
Prevents aliasing with proper sampling rate.
Nyquist frequency
Half the maximum original frequency.
Anti-aliasing filters
Low-pass filters before sampling.
Image quality measures
Assess image fidelity and diagnostic utility.
Contrast in imaging
Difference in signal intensity between features.
Pon a prueba tus conocimientos con 11 preguntas sobre Medical Imaging Fundamentals.
1. What is aliasing in a sampled image?
2. What is aliasing in the context of sampling in imaging systems?
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