Question

How can one reduce the aliasing effect on an image?

(a) By reducing the high-frequency components of image by blurring the image

(b) By increasing the high-frequency components of image by blurring the image

(c) By reducing the high-frequency components of image by clarifying the image

(d) By increasing the high-frequency components of image by clarifying the image

This question was addressed to me in my homework.

This intriguing question originated from Spatial and Gray-Level Resolution and Aliasing topic in section Image Enhancement of Digital Image Processing

Answer 1

Right choice is (a) By reducing the high-frequency components of image by blurring the image

The explanation is: Aliasing corrupts the sampled image by introducing additional frequency components to the sampled function. So, the principal approach for reducing the aliasing effects on an image is to reduce its high-frequency components by blurring the image prior to sampling.