D-Link DCS-1100 - mydlink-enabled Wired Network Camera Uživatelský manuál stáhnout pdf (Strana 28)

109

Image/Video Control – 3A Support

 Automatic Electronic Shutter (AES) – Feature that automatically adjust exposure time

according to the environment light and catch fast moving object to ensure image

clarity.

 Automatic Gain Control (AGC) – Electronic circuit that amplifies the video signal when

the strength of the signal falls below a given value.

 Automatic White Balance (AWB) – Technology that balances the image colors

against a light color object in the camera's view.

IP Surveillance Essential

• Image Processing

Correct White Balance Incorrect White Balance

110

Wide Dynamic Range (WDR)

 Wide Dynamic Range Technology uses two shutter speeds, high and normal, in

alternative video fields and combines these two fields into one frame. This will allow

details to be captured accurately even if one area is bright and another is dark by

combining the fields to one frame, thus yielding higher quality images.

IP Surveillance Essential

• Image Processing

Original Image

BLC

WDR

111

Light Sensitivity

 Light sensitivity of a surveillance camera is the illuminance level, measured in lux, at

which the camera produces a satisfactory image.

 The lower the lux rating, the more sensitive is the camera to the light. A camera with

lower lux rating will perform better in low-light condition.

 Generally, the camera needs at least 200 lux to produce a good quality image. With

more light on the object, the camera will produce the better image.

IP Surveillance Essential

• Light Sensitivity

Illuminance Light environment

32000 – 130000 lux Direct sunlight

10000 – 25000 lux Daylight – non direct sun

320 – 500 lux Recommended office lighting

80 lux Hallway / toilet

0.27 lux Full moon on a clear night

112

Summary

 A surveillance camera is generally built up of several components such as

lens, filter, image sensor, compression chip, CPU, memory, and interfaces.

Some IP cameras may have more components as they have certain

specialized capabilities.

 Some of the things that should be considered when choosing an IP camera

are lens type, lens mount standard, filter, image sensor, illumination and

resolution, because these can affect image quality.

 Lens type is important because there are various types of lens for

surveillance solutions designed differently to meet special purpose, such as

monofocal lens, varifocal lens, and zoom lens.

 Image Sensor of an IP Camera should also be considered when choosing

an IP Camera, depending on the needs. Image sensor comprises of two

different type: CCD or CMOS.

 Illumination rating is very important for video surveillance. This is used to

determine the amount of reflected light needed to produce a usable picture.

IP Surveillance Essential

• Summary

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