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.
Teste tes connaissances avec un QCM de 11 questions sur 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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