Criteria
The minimum required resolution according to Johnson's criteria are expressed in terms of line pairs of image resolution across a target, in terms of several tasks:
- Detection, an object is present (1.0 +/– 0.25 line pairs)
- Orientation, symmetrical, asymmetric, horizontal, or vertical (1.4 +/– 0.35 line pairs)
- Recognition, the type object can be discerned, a person versus a car (4 +/– 0.8 line pairs)
- Identification, a specific object can be discerned, a woman versus a man, the specific car (6.4 +/– 1.5 line pairs)
These amounts of resolution give a 50 percent probability of an observer discriminating an object to the specified level.
Additionally, the line pairs refer to lines being displayed on an interlaced CRT monitor. Each line pair corresponds to 2 pixels of a film image, or an image displayed on an LCD monitor.
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Famous quotes containing the word criteria:
“Every sign is subject to the criteria of ideological evaluation.... The domain of ideology coincides with the domain of signs. They equate with one another. Wherever a sign is present, ideology is present, too. Everything ideological possesses semiotic value.”
—V.N. (Valintin Nikolaevic)
“We should have learnt by now that laws and court decisions can only point the way. They can establish criteria of right and wrong. And they can provide a basis for rooting out the evils of bigotry and racism. But they cannot wipe away centuries of oppression and injustice—however much we might desire it.”
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“There are ... two minimum conditions necessary and sufficient for the existence of a legal system. On the one hand those rules of behavior which are valid according to the system’s ultimate criteria of validity must be generally obeyed, and on the other hand, its rules of recognition specifying the criteria of legal validity and its rules of change and adjudication must be effectively accepted as common public standards of official behavior by its officials.”
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