How to perform a gaussian blur using FFT?

1. How do you do the Gaussian blur?
2. How does Gaussian blur work?
3. How do you achieve the blurring of the image in the frequency domain?
4. What is Gaussian blur and how do you use Gaussian blur?

How do you do the Gaussian blur?

Go to Filter > Blur > Gaussian Blur, and the Gaussian Blur window will appear. You can drag the image in the Gaussian Blur window to look for the object you are going to blur. If you find it too small, tick the Preview box, and the result of the Gaussian Filter blur will be visible in the image.

How does Gaussian blur work?

In a Gaussian blur, the pixels nearest the centre of the kernel are given more weight than those far away from the centre. The rate at which this weight diminishes is determined by a Gaussian function, hence the name Gaussian blur. A Gaussian function maps random variables into a normal distribution or “Bell Curve”.

How do you achieve the blurring of the image in the frequency domain?

Filtering. Low pass filtering involves the elimination of the high frequency components in the image. It results in blurring of the image (and thus a reduction in sharp transitions associated with noise).

What is Gaussian blur and how do you use Gaussian blur?

Gaussian blurring is commonly used when reducing the size of an image. When downsampling an image, it is common to apply a low-pass filter to the image prior to resampling.