2.3 Gaussian Filter

In this class, we will learn about Gaussian Filter.

 

 

 

 

● Gaussian Filter

Gaussian Filter

A Gaussian kernel gives less weight to pixels further from the center of the window.

This 3 x 3 kernel is an approximation of a 2D Gaussian function.

 

 

 

 

● Difference between Gaussian filter and Box Filtering

Original Image

Gaussian Filter

Box Filtering

Box Filtering makes the image smaller.

 

 

 

 

● Shadow Effect

We can create shadow effect by overlaying Gaussiann blur image and original image.

 

 

 

● Soft Focus Effect

Soft Focus Effect

Soft Focus Effect is possible by blending Gaussian blurred image and the original image by half.

 

 

 

 

● Tilt Shift Effect

Tilt Shift Effect is the use of camera movements that change the orientation or position of the lens with respect to the film or image sensor on cameras.

 

Tilt Shift Effect

We focus on important objects, showing them clearly and blur the others.

 

 

 

Tilt Shift Effect is also possible using Gaussian blur.

 

 

 

 

Next class, we will learn about Image Subsampling.