31-05-2012, 03:31 PM
DIGITAL IMAGE PROCESSING “HOW NIGHT VISION WORKS”
[attachment=23718]
Abstract:
Night Vision scopes and binoculars are electro-optical devices that intensify (or amplify) existing
light instead of relying on a light source of their own. The devices are sensitive to a broad spectrum
of light, from visible through infrared. An accessory illuminator can increase the light
available at the infrared end of the spectrum by casting a beam of light that is not visible to the
human eye.Our paper is an image process application for night vision technology, which can be
often used by the military and law enforcement agencies, but are available to civilian users . In our
work, night vision googles capture the image even in the dark in the infrared region.
An infrared night vision system senses heat radiated by things and produces a video picture of the
heat scene. The gadget that senses the heat is a photocathode, similar to the one in a video
camera, except it is sensitive to infrared radiation instead of visible light. ability to improve poor
night vision.
How Night Vision Works :
Introduction To How Night Vision Works :
The first thing you probably think of when you see the words night vision is a spy or action movie
you've seen, in which someone straps on a pair of night-vision goggles to find someone else in a
dark building on a moonless night. And you may have wondered "Do those things really work? Can
you actually see in the dark?".
Infrared Light Can Be Split Into Three Categories:
Near-infrared (near-IR) - Closest to visible light, near-IR has wavelengths that range from
0.7 to 1.3 microns, or 700 billionths to 1,300 billionths of a meter.
Mid-infrared (mid-IR) - Mid-IR has wavelengths ranging from 1.3 to 3 microns. Both near-
IR and mid-IR are used by a variety of electronic devices, including remote controls.
Thermal-infrared (thermal-IR) - Occupying the largest part of the infrared spectrum,
thermal-IR has wavelengths ranging from 3 microns to over 30 microns.
The key difference between thermal-IR and the other two is that thermal-IR is emitted by an object
instead of reflected off it. Infrared light is emitted by an object because of what is happening at the
atomic level.
Basic Technologies:
Night vision work in two very different ways, depending on the technology used
Image Enhancement - This works by collecting the tiny amounts of light, including the lower
portion of the infrared light spectrum, that are present but may be imperceptible to our eyes, easily
observe the image.
Thermal Imaging - This technology operates by capturing the upper portion of the infrared
light spectrum, which is emitted as heat by objects instead of simply reflected as light. Hotter
objects, such as warm bodies, emit more of this light than cooler objects like trees or buildings.
Infra-Red Iluminators :
All Starlight scopes need some light to amplify. This means that if you were in complete darkness
you could not see. Due to this we have a built in infra-red illuminator (IRI) on all of our scopes.
Basically what an IRI does is throw out a beam of infra-red light that is near invisible to the naked
eye but your NVD can see it. This allows you to use your scope even in total darkness. The IRI
works like a flashlight and the distance you can see with it will be limited. We do use the most
powerful eye-safe illuminator on the market. This allows our IRI to extend out to 100 yards
However, because of the power at a short distance the IRI may cover only 40-60% of the viewing
area.
Night Vision Equipment :
Night-vision equipment can be split into three broad categories:
Scopes - Normally handheld or mounted on a weapon, scopes are monocular (one eye-piece).
Since scopes are handheld, not worn like goggles, they are good for when you want to get a
better look at a specific object and then return to normal viewing conditions.
DARK INVADER Multi-purpose Pocketscope
Goggles -
[attachment=23718]
Abstract:
Night Vision scopes and binoculars are electro-optical devices that intensify (or amplify) existing
light instead of relying on a light source of their own. The devices are sensitive to a broad spectrum
of light, from visible through infrared. An accessory illuminator can increase the light
available at the infrared end of the spectrum by casting a beam of light that is not visible to the
human eye.Our paper is an image process application for night vision technology, which can be
often used by the military and law enforcement agencies, but are available to civilian users . In our
work, night vision googles capture the image even in the dark in the infrared region.
An infrared night vision system senses heat radiated by things and produces a video picture of the
heat scene. The gadget that senses the heat is a photocathode, similar to the one in a video
camera, except it is sensitive to infrared radiation instead of visible light. ability to improve poor
night vision.
How Night Vision Works :
Introduction To How Night Vision Works :
The first thing you probably think of when you see the words night vision is a spy or action movie
you've seen, in which someone straps on a pair of night-vision goggles to find someone else in a
dark building on a moonless night. And you may have wondered "Do those things really work? Can
you actually see in the dark?".
Infrared Light Can Be Split Into Three Categories:
Near-infrared (near-IR) - Closest to visible light, near-IR has wavelengths that range from
0.7 to 1.3 microns, or 700 billionths to 1,300 billionths of a meter.
Mid-infrared (mid-IR) - Mid-IR has wavelengths ranging from 1.3 to 3 microns. Both near-
IR and mid-IR are used by a variety of electronic devices, including remote controls.
Thermal-infrared (thermal-IR) - Occupying the largest part of the infrared spectrum,
thermal-IR has wavelengths ranging from 3 microns to over 30 microns.
The key difference between thermal-IR and the other two is that thermal-IR is emitted by an object
instead of reflected off it. Infrared light is emitted by an object because of what is happening at the
atomic level.
Basic Technologies:
Night vision work in two very different ways, depending on the technology used
Image Enhancement - This works by collecting the tiny amounts of light, including the lower
portion of the infrared light spectrum, that are present but may be imperceptible to our eyes, easily
observe the image.
Thermal Imaging - This technology operates by capturing the upper portion of the infrared
light spectrum, which is emitted as heat by objects instead of simply reflected as light. Hotter
objects, such as warm bodies, emit more of this light than cooler objects like trees or buildings.
Infra-Red Iluminators :
All Starlight scopes need some light to amplify. This means that if you were in complete darkness
you could not see. Due to this we have a built in infra-red illuminator (IRI) on all of our scopes.
Basically what an IRI does is throw out a beam of infra-red light that is near invisible to the naked
eye but your NVD can see it. This allows you to use your scope even in total darkness. The IRI
works like a flashlight and the distance you can see with it will be limited. We do use the most
powerful eye-safe illuminator on the market. This allows our IRI to extend out to 100 yards
However, because of the power at a short distance the IRI may cover only 40-60% of the viewing
area.
Night Vision Equipment :
Night-vision equipment can be split into three broad categories:
Scopes - Normally handheld or mounted on a weapon, scopes are monocular (one eye-piece).
Since scopes are handheld, not worn like goggles, they are good for when you want to get a
better look at a specific object and then return to normal viewing conditions.
DARK INVADER Multi-purpose Pocketscope
Goggles -