What is «ground truth» in object detection?

Theory
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Ground truth represents the desired output of an algorithm on an input.

quora.com/What-is-the-meaning-of-term-ground-truth-in-object-tracking-algorithms/answer/Mikhail-Breslav

Ground truth is a term used in various fields to refer to information provided by direct observation as opposed to information provided by inference.

semanticscholar.org/topic/Ground-truth/33313