4.The mathematics used in computer vision involve decimals, fractions and square roots. They also make extensive use of statistics and probability. Therefore, the computer is never 100% sure of its answer.

5.If a part of an object in the input image is hidden or not clear enough, for example, a bicycle with one tire hidden behind a wall because the bicycle was parked against the wall, the computer cannot identify this object as a bicycle.

- They use models.
"All models are approximations. Essentially, all models are wrong, but some are useful".
- George Box

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