Glossary

A camera with full integration, high speed, pan/tilt/zoom function built into a protective dome housing allowing full and continuous 360 degree coverage of the scene.

The lens iris opening is automatically adjusted to allow the correct illumination of the camera sensor.

Autofocus refers to a camera lens' ability to adjust its configuration in order to focus properly on a subject regardless of whether it is near or far from the camera. Autofocus lenses generally provide vastly superior image quality than do their fixed focus cousins since they do not have to rely on their depth of field.

Each unit has a numerical address in the control system in which it is located. This allows the appropriate unit to be operated.

A flexible and sophisticated alarm management subsystem that allows rules to be created which define that input(s) activate one or more output(s). In its most basic form, a rule could define which inputs should activate which outputs. In a more complex form, a rule can be programmed to take specific keyboard command (pre-existing or not) and perform a dome function, or any combination of the above.

NTSC/PAL analog video output. RCA, BNC, or terminal block outputs are provided in DirectIP cameras.

You can use this to adjust the camera angle and focus during the installation.

The ratio of the measurable bright and dark intensity or the ability to show how much of a wide range of signals: dark to light.
The higher it is, you can discern/resolve more details of similar.

SNR means the ratio of the amplitude of a analog or digital data signal to the amplitude of noise. Typically SNR is expressed in decibels (dB).

Corrects defective dead or hot pixel.

Corrects the lens shading and/or barrel distortion.

The camera adjust the black level (no light) automatically to remove dark noises in the image.

Automatic White Balance. The camera adjust its white balance automatically.

The camera controls its gain value automatically. Too high gain value may result in more noisy and grainy images.

A rolling shutter is an electronic shutter used in electronic cameras. The image sensor reads and resets each pixel in a very fast speed in a serial manner. Thus one image is comprised of pixels sampled from ever so slightly different time. There are some artifacts for very fast moving objects.

When the analog cameras were first invented, we did not have enough technologies to handle bandwidth of D1@30ips full frame. So instead, the early engineers use a technique called interlaced video signal, used in NTSC/PAL, to use time and inter line multiplexing. So the story goes to complicate the old analog camera field image vs frame image, and even/odd fields, giving interlacing zig-zag artifacts of moving objects.

Virtually all IP cameras including DirectIP cameras use progressive scan these days. All images are taken in a progressive way.

However, in most cases, the image sensors use rolling electronic shutter, not a global electronic shutter. It's not perfect, but it is so much better than the interlaced scanned video.