Distance To Furthest Viewer

摘要

AV9000 Checklist Item Under Test: 6.3.14: The displayed image height relative to furthest viewer ratio has been measured:___(1:6). Record each, compare to recommended ratio or AVTXA's Display Image Size for 2D Content in Audiovisual Systems (DISCAS) standard. Reasoning: The switch from the "4-6-8 Rule" to AVIXA's DISCAS standard has confused a lot of people. It used to be very straightforward to calculate the image height required based on the furthest viewer given a task level. For most conference-room applications ("Basic Decision-making"), this was simply dividing the distance to the furthest viewer by six to calculate the recommended image height. However, AVTXA has shifted to Percent Element Height (%EH) to base this new calculation on what we expect users to be able to discern in the image.