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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?
Correct Answer: B
According to Johnson's criteria, the detection range for a person with an AXIS Q1921 with a 60 mm lens in clear weather is 1200 meters (3900 feet). This means that a human observer is able to detect a person at this distance with a 50% probability. Johnson's criteria is a widely accepted method for calculating the probability of detection, recognition, and identification of objects in surveillance imagery.