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Fourier Transform in Image Processing

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Questions and Answers

What is a primary use of the Fourier Transform in image processing?

Object recognition in video sequences

Feature extraction from audio signals

Edge detection and feature enhancement (correct)

Image compression and encoding

What is the main difference between space-time and frequency-domain representation of a signal?

One is used for analog signals and the other for digital signals

One is used for audio signals and the other for image signals

One is used for time-invariant signals and the other for time-variant signals

One is a graph of measurements with respect to time and/or position, and the other is an exact description of a signal in terms of its undulations (correct)

What is the characteristic of a signal that allows it to contain information?

It is aperiodic

It is periodic

It undulates (correct)

It is constant

What is the role of magnitude in the Discrete Fourier Transform?

It determines the strength of each component Signup and view all the answers

What is the role of phase in the Discrete Fourier Transform?

It determines the phase of each component Signup and view all the answers

What happens when a signal is down-sampled?

It becomes more distorted Signup and view all the answers

What is the result of reconstructing an image using only magnitude information from the Discrete Fourier Transform?

An image with the correct amplitude but incorrect phase Signup and view all the answers

What is a consequence of down-sampling an image?

Distortion of the image Signup and view all the answers

What is the purpose of the Fourier Transform in noise reduction?

To perform deblurring Signup and view all the answers

What does the frequency-domain representation of a signal describe?

The signal's frequency components Signup and view all the answers

What happens when a signal is reconstructed using only phase information?

The resulting image has no amplitude information Signup and view all the answers

What is the relationship between the space-time and frequency-domain representations of a signal?

They are related by the Fourier Transform Signup and view all the answers

What is a necessary characteristic of a signal for it to contain information?

It must undulate Signup and view all the answers

What is the purpose of the Fourier Transform in feature detection?

To perform edge detection Signup and view all the answers