Could someone explain why the max frequency is around 1/2? Thank you!
Mehvix
The highest frequency signal we could possible have is alternating black+white, for which we would need to sample every pixel (i.e. highest freq = 1 sample/pixel). And Nyquist rate is defined as half this frequency.
It may help to think about if we instead had a twice as slow signal -- we could get away with taking 1 sample for every 2 pixels (i.e. freq = 1/2 sample/pixel; Nyquist rate = 1/4)
Could someone explain why the max frequency is around 1/2? Thank you!
The highest frequency signal we could possible have is alternating black+white, for which we would need to sample every pixel (i.e. highest freq = 1 sample/pixel). And Nyquist rate is defined as half this frequency.
It may help to think about if we instead had a twice as slow signal -- we could get away with taking 1 sample for every 2 pixels (i.e. freq = 1/2 sample/pixel; Nyquist rate = 1/4)