Nyquist frequency from image
14 visualizaciones (últimos 30 días)
Mostrar comentarios más antiguos
Hi..
Is it possible to calculate nyquist frequency or the sampling frequency from image.
0 comentarios
Respuesta aceptada
Walter Roberson
el 13 de Abr. de 2012
floor(size(YourImage) ./ 2)
2 comentarios
Walter Roberson
el 13 de Abr. de 2012
Nyquist frequency for N samples is N/2. size() returns the number of samples in each direction, so divide the size by 2 to get the frequency. This corresponds to the maximum frequency reliably expressible, which is the case where alternating pixels are off and on.
Perhaps you don't need the floor(): it depends on how you want to handle the possibility of odd number of pixels in a direction.
Note that the nyquist frequency can be different between horizontal and vertical, which is why multiple values must be returned.
Más respuestas (0)
Ver también
Productos
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!