The IR distance is the distance from the camera that the infra red LEDs can illuminate. It’s a largely useless number and you will never be able to identify someone at this distance. All cameras that have on board infra red illumination will illuminate objects at the identification distance for the lens fitted.
What is IR range in CCTV camera?
IR range is a largely made up number based around how far away from the camera Infra red light can be detected. It has nothing at all to do with the effective range at which detail can be filmed.
What is the meaning of IR camera?
An infrared camera (also known as a thermal imager) detects and measures the infrared energy of objects. The camera converts that infrared data into an electronic image that shows the apparent surface temperature of the object being measured.
How much distance can a CCTV camera cover?
The C-mount cameras come with a detachable lens, which allows users to change it to fit their needs. For instance, the standard CCTV camera lenses can only cover distances between 35 and 40 feet. With C-mount cameras one can use special lenses, which can cover distances beyond 40 feet.
What is IR Cut night vision?
This is why day/night cameras feature an IR-cut filter which keeps the disturbing infrared light out of the image sensor during the day. When the light falls below a certain level, in contrast, the filter automatically swivels out of the way so that the infrared light does hit the image sensor.
How far can a 3.6 mm camera see?
There are many different fixed lens options, however the most common one is a 3.6mm Lens. This results in an angle of view a little over 90°. This will allow you to identify people at around 20 feet.
Which is wider 2.8 mm or 3.6 mm?
Offers a wider field of view, and is typically the broadest field of view for most standard CCTV Cameras. 3.6mm is a legacy camera size, typically only available in TVI Cameras or Varifocal lenses.
How do IR cameras measure temperature?
A infrared camera is a non-contact temperature measurement device. Infrared cameras detect the infrared energy emitted, transmitted or reflected by all materials — at temperatures above absolute zero, (0°Kelvin)– and converts the energy factor into a temperature reading or thermogram.
What is IR camera in laptop?
IR cameras are functioning like normal digital cameras: They have a sighting area, the so called field of view (FOV), which can typically vary between 6° for a telesco- pic optic and 48° for a wide angle optic.
Where are infrared camera used?
In trail cameras, infrared technology is also used for night vision and capturing nocturnal wildlife. Other industries such as law enforcement, mechanical engineering, and home repair and inspection use real-time thermal imager measurements with a rapid refresh rate to detect minute variations in temperature ranges.
What is Dori distance CCTV?
DORI stands for Detect, Observe, Recognise, Identify. The DORI distance is a “general proximity” of distance which makes it easy to pinpoint the right camera for your needs.
How far can a 4mm lens see?
In general a 5MP 2.8mm lens will offer you around 105° field of view and a 5MP 4mm lens will offer you an 87° field of view.
Does infrared work in daylight?
Because infrared cameras measure light that is not visible, they can work in darkness as well as daylight.For commercial and industrial use, ICI offers numerous products that will capture the heat and energy emissions outside in broad daylight.
Do I need an IR-cut filter?
Using a color camera to achieve realistic colors in white light requires an IR-cut filter. The color spectrum seen by the human eye is quite limited compared to the spectrum seen by a CCD camera. Especially, in the near infrared region of the spectrum the difference in sensitivity is significant.
Why use a UV IR-cut filter?
Get More Accurate Visible Color With UV-IR Cut Filter
This is important because unfiltered CCD and CMOS sensors are extremely susceptible to UV and IR rays just outside the visible spectrum. These rays can cause light contamination and have a very negative impact on image quality.
What is the difference between a 2.8 mm and 4mm lens?
Although it has more clarity at a further distance, the 4mm lens shows a similar scene to the 2.8mm. The main difference is the reduced angle of view which gives the illusion that objects are closer to the camera. A 4mm lens is useful for detection & identification.
What does 2.8 12mm lens mean?
Normally the varifocal security camera is from 2.8 to 12 millimeters, this means that you can increase and decrease the degree of vision. normally the varifocal security cameras are more expensive than the fixed lens cameras, the lenses Fixed are the cameras that the angle of vision does not vary.
How far can a 4K camera see?
Distance is simply not a factor, as this Ultra HD security camera is able to identify a person’s face over 250ft away at maximum zoom, and has an astounding 330ft of infrared night vision. Easily plug this camera into your one of our NVR to view it remotely and record pristine high-resolution 4K video recordings.
What is the meaning of 3.6 mm lens?
A security camera lens size determines the field of surveillance view and zoom level that the camera provides. A 3.6mm lens is designed to provide an approximate 78° field of view and is the perfect camera in most CCTV applications.
What angle is a 6mm lens?
Details
| 6mm Wide Angle Lens | 16mm Telephoto Lens | |
|---|---|---|
| Angle of view | 63° | 1″ 44.6° × 33.6° 2/3″ 30.0° × 23.2° 1/1.8″ 24.7° × 18.6° 1/2″ 21.8° ×16.4° |
| Back focus | 7.53mm | 17.53mm |
| Optical length | – | 67.53mm |
| Distortion | – | 1″（-0.7%） 1/2″（-0.5%） 1/3″（-0.15%） |
Which is better hikvision or Dahua?
Hikvision’s model has a max bitrate of 16Mbps, as opposed to the max bitrate of 10Mbps offered in Dahua’s cameras. Both are generally more than enough, but if that number is important to you, Hikvision wins the prize.
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