max radial frequency of an image
1 visualización (últimos 30 días)
Mostrar comentarios más antiguos
@image analyst sr, i want to find the maximum radial frequency of an image. can u please help me how to get it.
Thanx
0 comentarios
Respuestas (1)
Image Analyst
el 18 de Oct. de 2016
How are you defining max? The max frequency is defined by the sampling distance, though your actual image may not have frequencies that approach that. For example your max frequency may be 1/1000 but if you have a really smooth broad Gaussian in the image, your max Frequency may be only a quarter of that or less.
2 comentarios
Image Analyst
el 18 de Oct. de 2016
The maximum radial frequency that is capable of being recorded depends solely on how many pixels you have in the x or y direction. Whether you actually have any frequencies that high depends on your image content. It could be that anything way out there is simply noise. I don't know of any special code for polar fft. Just use regular fft. You could always create two new images from the cartesian image where you have the radius and the angle computed from each frequency component (each pixel in the cartesian FFT image).
Ver también
Productos
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!