Other environmental stress variables found to exert negative influences are vibration, low illumination, high atmospheric pressure, noise, glare, toxic gases, ionization, and subgravity.
The sensitivity of the eye under conditions of low illumination is less in the old than in the young; that is, "night vision" is reduced.
In practice, photoconductive effects are not usually as large as this, but this example indicates that appreciable changes in conductivity can occur even with low illumination.
For far too long it's also puzzling why the neighboring town, a decentered heap of undifferentiated shacks with peeling paint and low illumination, seems populated only by shuffling old people who appear to be abusing their meds.
Shorter and far fewer than the eye's rods (the other type of retinal light-sensitive cell), cones are less sensitive to low illumination levels and are mediators of photopic rather than scotopic (Greek skotos, "dark") vision.
Fig. 1 Images captured in nighttime low illumination and daytime.
However, due to the unknown depth information of a low illumination image, nighttime low illumination enhancement is a challenging problem.
In addition, the low illumination enhancement problem becomes very challenging when the depth information of a low illumination image is unknown.
(a) color image in normal illumination; (b) depth image in normal illumination; (c) color image in low illumination; (d) depth image in low illumination.
The results from simulations showed a 30-ps response time at a low illumination level.
Hence, we collected totally 200 natural nighttime low illumination images from the Internet.
