Signals + Aliasing Flashcards
1
Q
What does the box kernel look like in the frequency domain
A
The sinc function
2
Q
What is a gaussian kernel with S.D. s look like in the frequency domain
A
A gaussian kernel w/ S.D. 1/s
3
Q
Convolution Theorem
A
Convolution in the spatial domain is equal to multiplication in the frequency domain
4
Q
The Fourier transform of an impulse train with with w is
A
An impulse train with width 1/w
5
Q
Aliasing
A
The overlapping of frequency components due to sampling rate being too slow
6
Q
Anti-aliasing
A
Applying a low pass filter to the image to avoid overlapping high-frequency signals
7
Q
Nyquist rate
A
The Nyquist rate is 2*(highest frequency allowed by LP filter). This is the highest frequency signal allowed before signals start overlapping
8
Q
A
