The number of raster lines of a display required to interpret different levels of objects within a displayed scene. These levels are:
- 1. No detection
- 2. Detection
- 3. Shape orientation
- 4. Shape recognition
- 5. Detail recognition
Sometimes used in training simulators to determine required resolution of visual displays.
- J. Johnson, "Analysis of Image Forming Systems," Proc. Image Intensifier Symposium, US Army Engineer Research and Development Laboratories, Fort Belvoir, Va., 6-7 Oct. 1958 (AD220160).
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