Term
Definition
CRI
A color rendering index (CRI) is a quantitative measure of the ability of a light source to reveal the colors of various objects faithfully in comparison with an ideal or natural light source. Light sources with a high CRI are desirable in color-critical applications such as neonatal care and art restoration.
BBAR
Broad-band antireflective or anti-reflection (AR) coating is a type of optical coating applied to the surface of lenses and other optical elements to reduce reflection. In typical imaging systems, this improves the efficiency since less light is lost due to reflection.
ED
ED (Extra-low Dispersion) glass is an alternative glass manufacturing technology developed by Nikon to overcome chromatic aberration.
Shutter Speed
It is the length of time a camera shutter is open to expose light into the image sensor. Slow shutter speeds allow more light into the image sensor and are used for low-light and night photography, It is expressed in fractions of a second.
Aperture
It is the adjustable hole within the lens through which light is being exposed into the image sensor. The aperture can be open wide letting lots of light in but keeping less elements in focus, or tiny allowing only a small amount of light in while keeping more elements in focus. Aperture values are expressed in F-stops.
3D-DNR
Digital Noise Reduction (DNR) is a method by which the camera’s imager digitally removes noise from the image. 3D DNR is an advancement of this technology which enables noise to be filtered even more effectively from the image, even in low light conditions.
Field of View
The field of view of a security camera, also called the viewing angle, is the area that the camera can see. On a specification sheet, you will see the field of view measured in degrees. Think of the field of view as the angle between the two horizontal edges of the camera image.
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