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What is the name of the effect that causes different signals to become indistinguishable?

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What is the name of the effect that causes different signals to become indistinguishable?

(a) Aliasing

(b) Anti-aliasing

(c) Sampling

(d) Staircase effect

I had been asked this question during an interview.

I would like to ask this question from Area Sampling in division Graphics Primitives of Computer Graphics

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Right choice is (a) Aliasing

Explanation: When the resolution is too low, visual stair-stepping of edges occurs in an image. That effect is called aliasing.

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