Aliasing in computer graphics

Aliasing is the visual stair-stepping of edges that occurs in an image when the resolution is too low. Anti-aliasing is the smoothing of jagged edges in digital images by averaging the colors of the pixels at a boundary.

1. What is meant by the term aliasing?
2. What is aliasing explain its types?
3. What causes aliasing in graphics?
4. How does aliasing reduce computer graphics?

What is meant by the term aliasing?

ali·​as·​ing ˈā-lē-ə-siŋ ˈāl-yə- : an error or distortion created in a digital image that usually appears as a jagged outline. We commonly observe aliasing on television.

What is aliasing explain its types?

Aliasing occurs when an oscilloscope does not sample the signal fast enough to construct an accurate waveform record. The signal frequency is misidentified, and the waveforms displayed on an oscilloscope become indistinguishable. Aliasing is basically a form of undersampling.

What causes aliasing in graphics?

Aliasing is Caused by Poor Sampling

A bandlimited signal is one with a highest frequency. The highest frequency is called the bandwidth ωb . If sample spacing is T, then sampling frequency is ωs =2π/T. (If samples are one pixel apart, then T=1).

How does aliasing reduce computer graphics?

Aliasing is removed using four methods: Using high-resolution display, Post filtering (Supersampling), Pre-filtering (Area Sampling), Pixel phasing.