Advanced
Computer Graphics & Multimedia
Q91 / 100
In motion-compensated video compression, what is the role of a "motion vector"?
Correct! Well done.
Incorrect.
The correct answer is B) It records the direction and distance a block of pixels has shifted between frames, letting the encoder describe a frame mostly via references to similar blocks in earlier frames rather than re-storing all the pixel data
B
Correct Answer
It records the direction and distance a block of pixels has shifted between frames, letting the encoder describe a frame mostly via references to similar blocks in earlier frames rather than re-storing all the pixel data
Explanation
Motion vectors describe how blocks of pixels move between frames, letting codecs like H.264/H.265 encode inter-frames primarily as references plus small residual differences — drastically reducing redundant data.
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91/100