The Johnson Criteria assumes that the critical dimension for a human being is 0.75 meters. To get DRI, you need 1.5 pixels, 6 pixels and 12 pixels across 0.75 meters in the object pane. That means:
Detection = 1.5 pixels / 0.75m = 2 pixels per meter
Recognition = 6 pixels / 0.75m = 8 pixels per meter
Identification = 12 pixels / 0.75m = 16 pixels per meter
Assuming that a man is 1.83m by 0.5m, the following would apply:
3.6 pixels by 1 pixel
(You can see something
is there) |
13 pixels by 5 pixels
(You can see that a
person is there) |
28.8 pixels by 8 pixels
(You can see that the
person looks like a soldier) |
The Johnson Criteria assumes that the critical dimension for a human being is 0.75 meters. To get DRI, you need 1.5 pixels, 6 pixels and 12 pixels across 0.75 meters in the object pane. That means:
Detection = 1.5 pixels / 0.75m = 2 pixels per meter
Recognition = 6 pixels / 0.75m = 8 pixels per meter
Identification = 12 pixels / 0.75m = 16 pixels per meter
Assuming that a vehicle is 4m by 1.5m, the following would apply:
2.8 pixels by 1 pixel
(You can see something
is there) |
13 pixels by 5 pixels
(You can see that a
vehicle is there) |
26 pixels by 10 pixels
(You can see that the
vehicle may be a humvee) |
The Johnson Criteria assumes that the critical dimension for a human being is 0.75 meters. To get DRI, you need 1.5 pixels, 6 pixels and 12 pixels across 0.75 meters in the object pane. That means:
Detection = 1.5 pixels / 0.75m = 2 pixels per meter
Recognition = 6 pixels / 0.75m = 8 pixels per meter
Identification = 12 pixels / 0.75m = 16 pixels per meter
Assuming that a inflatable boat is 9m by 1m, the following would apply:
4.5 pixels by 1 pixel
(You can see something
is there) |
18 pixels by 2 pixels
(You can see that a
boat of some kind is there) |
36 pixels by 4 pixels
(You can see that the boat
is a small Inflatable Boat) |
Human DRI
Vehicle DRI
Inflatable Boat DRI
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