In clear weather. Axis specifies, in accordance with Johnson's criteria, an AXIS Q1921 with a 60 mm lens to have detection range of 1200 m (3900 ft) for a person. Based on this estimation which of the following is true?
A) An analysis or analytic software is able to detect a person in 1200 m distance with 90% probability
B) A human observer is able to detect a person in 1200 m distance with 50% probability
C) A human observer can discern a person versus a car in 1200 m distance with 90% probability
D) An analysis or analytic software is able to discern a person versus a car in 1200 m distance with 50% probability

Question

Quizplus · Accepted Answer

According to Johnson's criteria, the detection range of an AXIS Q1921 with a 60 mm lens is 1200 m for a person. This means that a human observer is able to detect a person in 1200 m distance with 50% probability, not with 90% probability (choice A) or discern a person versus a car with 90% probability (choice C). The question does not mention anything about software being used to detect or discern objects, so choices A and D can be eliminated.

In Clear Weather