# Linked Questions

2 votes
3 answers
5k views

### what are frequencies in a digital image? [duplicate]

I don't completely understand the term " frequency" with respect to digital image processing. for 1D electrical signals , its pretty easy to understand , visually too. higher the frequency - more ...
0 votes
1 answer
5k views

### Compare phase and magnitude spectrum results of 2 Images [duplicate]

I have read that from Fourier transform we obtain magnitude and phase spectrum. The magnitude spectrum tells you how strong are the harmonics in a image and the phase spectrum tells where this ...
• 434
0 votes
3 answers
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### How we define frequency in an image? [duplicate]

How we define frequency in an image? Does the repetition of a single gray level defines the frequency?(Example: can a black(single color/constant region) background image be called high frequency ...
• 45
3 votes
1 answer
477 views

### What is the role of Freqency in Digital Images [duplicate]

Possible Duplicate: What does frequency domain denote in case of images? If we look deeply into Digital Images they are purely generated by the pixels distributed in rows and coloumn and the ...
• 2,145
0 votes
2 answers
126 views

### Filtering + Images [duplicate]

Possible Duplicate: What does frequency domain denote in case of images? I am studying applications of low and high pass filters in images. However, first I'm trying to understand what exactly ...
• 173
1 vote
1 answer
337 views

### Can you explain how to imagine frequency in 2D? I need to understand how the concept of frequency exists in images [duplicate]

The concept of frequency spectrum exists because it is possible to sum sines and cosines of various frequencies together to make any periodic signal. The frequencies of these individual sinusoids make ...
• 485
2 votes
3 answers
22k views

### Frequency spectrum of a set of images in Matlab

I wish the compute the frequency distribution of a set of images. I basically am keen on finding out how the the frequency varies in the images. I know I can use the 'fft2' function to compute the 2-...
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4 votes
1 answer
3k views

### Which information do we get from magnitude and phase spectrum?

I am learning image processing. I want to ask very basic question related to FFT topic Which information do we actually get from "phase spectrum" and "magnitude spectrum" about an image?
• 549
4 votes
2 answers
8k views

### Why Frequency Domain conversion is Important in Digital Image Processing?

Any Image enhancement technique can be easily applied to the normal images. Still, most of the folks say that frequency domain conversion of the images can lead to better enhancement. Why do we need ...
• 43
4 votes
3 answers
3k views

### Understanding FFT of an Image

I am having trouble identifying the frequency components of an image, Here I simply generated, 256x256 binary-image. a = [zeros(256,128) ones(256,128)]; imshow(a); ...
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2 votes
1 answer
3k views

### Importance of Phase in FFT of an image

While processing digital images in the Fourier domain, mostly we exploit the amplitude and not the phase. This could be because the amplitude is much more structured and the amplitude spectrum reveals ...
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3 votes
2 answers
2k views

### Comparing Image FFT with Sine wave FFT

So, When we take the FFT of any Composite or Single Sine Wave we get exact frequency on x-axis of the plot. The point where we get the original frequency in FFT is depend upon the Sampling Rate and ...
• 2,145
0 votes
3 answers
2k views

### What is the basic concept of Fourier transform

I use discrete Fourier transform for digital image processing purposes , but I don't understand basic concept behind it. For example : What information exists in frequency domain? What is ...
• 139
2 votes
2 answers
872 views

### Fourier Decomposition

Hello everyone have a look at this video of Fourier Decomposition of an image(otherwise you can also refer the image which shows few plots of different extracted waves from an image) . We also know ...
• 407
1 vote
2 answers
1k views

### Finding the Harmonics contained in an Image?

I am beginer in image processing. Any signal whether it is 1D,2D or any multidimensional signal can be represented using combination of number of sine and cosine wavesforms (harmonics). Similerly any ...
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