by s k 8 e r » Wed Dec 13, 2006 9:49 am
Let’s imagine there’s a man walking the street. He fits the description of a known murder suspect, but he is wearing a pair of dark sunglasses, so no-one can see his eyes. Yet there is a way to check he identity without even having to approach the man - a video camera equipped with a KAYA PF would see straight through the dark sunglasses. To the viewer, they now appear totally transparent, like standard glasses. The man’s face would be identifiable even if he was in a car with tinted windows!
Voyuerism (not encouraged!)
The PF is able to see through some types of clothes, for example, thin clothes, tight clothes, sundresses, swimsuits and so forth. Be aware that this means that you can see a person’s body or underwear through the external garment. In other words, the PF allows you to “see through†someone’s clothes. It is also possible to see through a woman’s made-up face as if no lipstick and foundation had been applied.
Long-distance Photography
The PF can be used for improving visibility through certain kinds of fog or haze. This property is particularly important for long-distance photography on the ground where the detail of distant objects is often obscured by haze. It is also useful for high altitude, and especially oblique photography from the air like when landing an airplane in a foggy airport. Actually, the PF does not always result in a very striking increase in the range of vision, but it generally increases the contrast of the distant objects and thus the amount of detail that can be seen.
Pollution Monitoring
The PF can be used in pollution monitoring applications. Since both water and air when pure have very low NIR (Near Infrared Rays) reflectance those appear very dark when viewed through the PF. But their reflectance may be greatly increased by the presence of minute quantities of dissolved or suspended materials and this makes them appear less dark under the same conditions. Though a PF will not detect thermal pollution such as warm water entering a river from a generating station or hot gases above a smokestack, it may detect chemicals, certain dusts, pollens, aerosols and gases dissolved in gaseous or aqueous effluents owing to pure water and air’s low NIR reflectance.
Ice Reconnaissance
The PF can be used to obtain data on sea-ice distribution and movement. Because of its low reflectance to infrared radiation, water appears very dark and the ice appears light in an image. Therefore, the interface between water and ice and land becomes highly discernible.
Agriculture, Plant Pathology and Forest Survey
The PF can be used in agriculture, plant pathology and forest surveys for the detection of crop yields, crop and tree diseases, insect infestations in forests and orchards, and identification of tree species. NIR images of foliage made with the PF often show great variations in NIR reflectance even when leaves visually show just small variations in shades of green. When viewed through the PF, healthy grasses and the foliage of healthy deciduous trees appear white because of the high NIR transmission characteristic of green chlorophyll and the high NIR reflectance of the underlying cellular structure of these subjects. On the contrary, diseased and dead trees and burned grass tend to appear dark in an NIR images. Also in any given vegetation, the season, the water and mineral content of the soil, and the age and health of the vegetation may cause its NIR reflectance to vary. In fact, the first sign of a distressed tree (or plant) is often a decrease in NIR reflectance, which frequently first becomes apparent in NIR images. This means that the first sign can be detected by using the PF before trouble becomes apparent visually.
- Attachments
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- see, this is what happens with the filter
- camera_filter1.jpg (14.47 KiB) Viewed 341 times
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- see, this is what happens with the filter
- camera_filter1.jpg (14.47 KiB) Viewed 342 times