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Johnson's criteria

Release time:

2026-04-15

Johnson's criteria, an international standard to evaluate thermal camera performance.

Johnson's Criteria defines the minimum resolution (measured in line pairs or pixels) required for thermal imaging and electro-optical sensors to achieve Detection, Recognition, and Identification (DRI) of a target with 50% probability. It serves as a valuable reference for the selection of thermal imagers.

Key DRI Components

Detection (1.0 - 1.5 line pairs / 2 pixels): Determines an object is present, appearing as a "blob" or "speck" on the screen.
Recognition (4.0 - 8 line pairs / 8-9 pixels): Allows the observer to determine the class of object, such as distinguishing a person from a vehicle or a tank from a truck.
Identification (6.4 - 12+ line pairs / 12-14 pixels): Enables distinguishing specific details, such as a man vs. a woman, or the specific type of vehicle.

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