Sony SNC-RZ25N - Network Camera Каталог - Сторінка 42

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GLOSSARY

Activity Detection

A method of detecting activity in an image. Activity detection

compares illumination levels between frames on a pixel-by-pixel

basis. If the average change in luminance level from one frame to

the next is greater than a pre-specified threshold, then an alarm is

triggered.

Automatic Gain Control (AGC)

Amplifies existing video to help camera reproduce a video signal at

very low light levels.

Adaptive Picture Control (APC)

Automatically detects the condition of the recording head and video

cassette tape and then sets the optimum recording head current.

Available on all SVT time lapse VCRs.

Adaptive Rate Control (ARC)

A technology that automatically detects and compensates for

network traffic when transferring MPEG-4 image data over a

network. In order to prevent "Drop Outs" when the network

becomes congested, ARC first lowers the data bit rate, and if the

network is still congested, then ARC lowers the frame rate.

Aperture/Sharp Mode

Makes object outline in the picture appear sharper. Ideal for

situations where an object merges into the scene with a similar

shade of color.

Auto Tracing White Balance (ATW)

Adjusts the white balance automatically in response to varying light

conditions.

ATW PRO

Ideal for frequently changing light conditions and applications where

the operator needs to see objects as they appear to the eye.

Effective operational color range is 2500 to 6000K.

Auto Iris

Automatically adjusts the iris element as the light level changes.

Auto White Balance (AWB)

Automatically memorizes adjusted white balance values.

Backlight Compensation (BLC)

Picture brightness is adjusted automatically depending on lighting

conditions. Overcomes the problem of strong backlight which often

causes the subject of the picture to be cast into shadow.

C Mount

Type of camera mount which measures 17.5 mm from the lens rear

mounting surface to the camera's CCD.

CS Mount

Type of camera mount which measures 12.5 mm from the lens rear

mounting surface to the camera's CCD. CS mount lenses can be

used with C mount cameras by adding a 5 mm spacer.

DC Servo Auto Iris Lens

Lens that relies on DC power from the camera to control the iris.

Digital Signal Processing (DSP)

Converts the analog signal from a CCD image sensor into a digital

signal through an internal A/D converter. The signal is then broken

down into luminance and chrominance components for processing,

adjustment and feature enhancement enabling many digital features

such as backlight compensation.

Duplex

Type of multiplexer allowing simultaneous live monitoring or

playback as images are being recorded.

DynaView Technology

A technology used to capture clear images even in extremely high-

contrast lighting environments. When using DynaView technology,

the camera actually captures the image twice - once at a normal

shutter speed and then at a high shutter speed - and creates a

composite high-contrast image.

Exwave HAD Technology

Sony technology employing advanced sensor structure within the

CCD resulting in improved sensitivity over Super HAD technology.

JPEG

A compression method used in conventional surveillance and

monitoring systems that is ideal for capturing high-quality still

images.

Motion Detection

A method of detecting motion in an image. Motion detection uses

vector information available and inherent in MPEG-4 compression.

Motion detection has an advantage over activity detection because it

can reduce the number of false alarms caused by noise.

MPEG-4

A compression method that takes into account only the movement

in an image when capturing data. MPEG-4 compression is ideal for

data that is transferred over networks because of its relatively small

data size.

Sensitivity

The amount of light falling on a scene measured in lx.

Simplex

Type of multiplexer which allows the user to choose between live

monitoring, recording or playback.

Smear

Vertical streaks above and below a brightly lit object or light source

when observed on the monitor. Vertical lines on the screen are

caused by the leakage of unwanted light onto the vertical shift

SuperExwave Technology

Sony camera technology that uses CCDs with advanced photo-diode

sensors capable of capturing a great amount of light especially in the

near infrared (IR) region of the spectrum. As a result, sensitivity

levels have been improved by the following percentages when

compared to Exwave HAD technology: Approximately 10% in the

visible region, and approximately 50% in the near IR region.

Super HAD Technology

Improves camera sensitivity by optimizing the shape of on-chip micro

lenses on the CCD in order to minimize the invalid area between

micro lenses of each pixel.

Synchronization

Used in multi-camera installations where automatic switching is

employed and allows roll-free switching from camera to camera.

Triple Multiplexing

Video, sync and power transmitted over a single coaxial cable.