Typical Luminance Values

Table 2 Typical luminance values relevant for camera-monitor-systems in road vehicles...

Table 1. Typical values of luminance for different ambient light conditions and display devices (Boff et al., 1988 Anderson, 2005).

Surface rendering uses a specific attenuation coefficient to define the air-lumen interface. This is done by attaching an opacity value of 0 (complete transparency) to voxels that have an attenuation coefficient under a certain threshold and an opacity value of 1 (no transparency at all) for voxels above this threshold. Consequently, surface rendering assigns all structures either into luminal air or colonic wall, depending on the attenuation coefficient selected. By raising the threshold, more voxels of the colonic mucosa will be assigned to the lumen since the attenuation coefficient in transition zone (mucosa) typically lies between that of air and soft tissue. 

Example An Incandescent Bulb Consider a 100-W incandescent bulb. If all of its power were made available as radiation at 0.55 pm, each watt would generate 692 lumens, or a total of 69,200 lumens. Bulb manufacturers now state the luminous output of their bulbs on the package typical values are around 1700 lumens for a 100-W incandescent bulb. Thus the efficiency is about 1700 divided by 69,200, or 2.5%. The rest of the power goes into that portion of the spectrum to which the eye does not respond, and into heating the space around the bulb. ... 

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