Training Videovigilancia IP: Capture

Videovigilancia IP: Captura (este documento está en inglés)

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IP Surveillance: Capture

From Analog to Digital

Switching from Analog to Digital Camera

digitization Network Cameras

Switch (PoE)

PC (Management Software) /

NVR

Ethernet Cable (PoE)

Up to 16-32 channels

DVR

Monitor Analog Cameras

Coax Cable

Facilities and Signal Transmission All Digitalized Thru TCP/IP

Component Introduction

Network Camera Breakup Structure

• Optical (Lens, Sensor) •  IP module (TV decoder/TV encoder, video

codec, network)

Camera Sensor board with Lens &

ICR Camera IP board


Auto Iris lens

ICR

Camera Board

Front cover

POE Screw I/O connectors AI connector

Housing and back panel

IP Board


(Front) (Back) Sensor Board detail

sensor


(Front) (Back) IP Board detail

Video Codec (SoC)

CF card slot

Camera with C/CS mount Lens


"  Peripheral (Lens, enclosure, illuminator, scanner, bracket etc...)

Camera with illuminator Camera with Bracket

Camera with Scanner Camera with enclosure

Capture technology

NTSC and PAL

Recorded video is composed of scan lines. These lines can be displayed in two ways: •  Interlaced scan •  Progressive scan

There are two analog video standard resolutions: •  NTSC (National Television System Committee) •  PAL (Phase Alternating Line)

IP Surveillance Essential •  Resolution

D1

720

x 48

0 4CIF 704 x 480

2CIF 704 x 240

CIF 352 x 240

QCIF 176 x 120 D

1 72

0 x

576 4CIF 704 x 576

2CIF 704 x 288

CIF 352 x 288

QCIF 176 x 144

NTSC Image Resolutions PAL Image Resolutions

Sensor type and function

CCD (Charge-Coupled Device) sensor has better light sensitivity and produces less noise image than CMOS sensors.

CCD complex process consumes a lot more power, as much as 100 times more power than CMOS sensor.

Interlaced CCD

Progressive CCD

Interlaced CMOS

Progressive CMOS

CMOS (Complementary Metal Oxide Semiconductor) sensors offers more integration and functionality on the chip

Lower power dissipation CMOS is cheaper Light sensitivity of CMOS sensors is almost equal to CCD

sensors now

CCD Technology

CCD (Charge-Coupled Device) sensor is a mature sensor technology that has been used in cameras.

Special process is used in CCDs manufacturing to create the ability of CCD to transmit charge across the chip without distortion thus CCD has better light sensitivity and produces less noise image than CMOS sensors.

CCD complex process consumes a lot more power, as much as 100 times more power than CMOS sensor.

IP Surveillance Essential •  Image Sensors

16

CMOS Technology

Compared to CCD sensors, CMOS (Complementary Metal Oxide Semiconductor) sensors offers more integration and functionality on the chip, with lower power dissipation at chip level, and faster readout, which are important advantages for producing high quality image. CMOS is cheaper as compared to CCD sensor because the chip can be fabricated on almost any standard silicon production line. Light sensitivity of CMOS sensors is lower than CCD sensors because each pixel on a CMOS sensor has several transistors located next to it, thus many of the photos hit the transistors instead of the photodiode.

IP Surveillance Essential •  Image Sensors

Megapixel Resolution

Pixel is a tiny square of color, the smallest component of a digital image. One megapixel consists of a million of individual pixel. A camera with megapixel resolution has a megapixel sensor that can produce an image using a million or more pixels in it. The more pixels a sensor has, the more details and higher quality the image can be produced. Details of image produced by the camera is one of the most important aspects in surveillance system.

Display format No. of megapixels Pixels

SXGA 1.3 megapixels 1280 x 1024

UXGA 1.9 megapixel 1600 x 1200

IP Surveillance Essential •  Resolution

Megapixel Sensor

Resolution means details of an image. For video surveillance applications, to easily identify a criminal usually requires a high resolution image.

The maximum resolution of analog camera is: •  NTSC D1(704x480 = 337,920) similar 0.3 Megapixel •  PAL D1(704x576= 405,504) equals 0.4 Megapixel

Usually, only CIF resolution is used for recording: •  NTSC CIF(352x240 = 84,480) similar 0.08 Megapixel •  PAL CIF(352x288= 101,376) equals 0.1 Megapixel

Currently only IP cameras that use digital compression and transmission can achieve megapixel resolution. Higher resolutions are expected in the future.

A common megapixel format is •  CMOS 1.3M(1280x1024=1,310,720) equals 1.3 Megapixel •  CCD 1.3M(1280x960=1,228,800) similar 1.2 Megapixel

It’s 4 times higher than analog cameras!

1.3 megapixel Camera provides up to 4 times higher resolution than common VGA/D1 camera Megapixel resolution provides details and clarity not seen on traditional analog and VGA cameras, especially at the border of the object.

Megapixel VGA

Megapixel Sensor

CIF D1 / VGA Mega pixel

1.3 megapixel Camera provides up to 4 times higher resolution than common VGA/D1 camera Megapixel resolution provides details and clarity not seen on traditional analog and VGA cameras, especially at the border of the object.

Megapixel Sensor

16x Digital Zoom

1x ~ 16x digital zoom adjustable at VGA resolution

1x video @ VGA resolution

16x digital zoom

actual size of 36mm 16x zoom size of 2mm

The left image is a 16x zoom image for 2mm length. The right image is around 18 pcs of 2mm actual length. Therefore, DCS-2121/2102 supports 16x digital zoom

Optical Zoom 18x

Light Sensitivity

Light sensitivity of a surveillance camera is the luminance 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.

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

IP Surveillance Essential •  Light Sensitivity

Lens type and function

Fixed lens Fixed focal length Fixed iris Fixed zoom

Board mount Lens

C/CS mount Lens

Varifocal lens Variety of focal length( need to manually

refocus the lens every time they change the field of view of the camera)

Manual/auto Iris Manual/auto zoom

Board mount Lens

C/CS mount Lens

Field of View

There are three types of surveillance camera’s field of view: •  Normal View

Normal view offers the same field of view with human eye. •  Telephoto

Telephoto offers narrower field of view as compared to human eye, but better details of image. This type of view is usually used for small or far surveillance object.

•  Wide Angle Wide angle offers wider field of view as compared to human eye, but lesser details of image. This type is usually used for viewing larger areas of surveillance.

IP Surveillance Essential •  Lens Elements

Wide Angle Normal View Telephoto

Field of View

There are three types of lens categorized based on how their field of view is adjusted: •  Fixed lens

This type of lens provides fixed focal length and only supports one field of view, either of telephoto, normal or wide angle, and is usually designed for optimal resolution. A fixed IP camera usually has 4 mm focal length.

•  Verifocal lens This type of lens provides a variety of vocal length and supports different fields of view. A verifocal IP camera offers a range of 3 mm to 8 mm focal length. One limitation of such lens is that users need to manually refocus the lens every time they change the field of view of the camera.

•  Zoom lens Similar to verifocal lens, Zoom lens gives users the flexibility of adjusting the focal length and field of view. With zoom lens, users do not need to refocus the lens when they adjust the focal length. A lens zoom capability is the ratio between the lens’ shortest and longest focal length, for example in the case of an 8x-zoom, the shortest focal length will be 6 mm and the longest 48 mm.


The focal length of an optical system is a measure of how strongly the system converges (focuses) or diverges (defocuses) light. In photography, longer focal length or lower optical power is associated with larger magnification of distant objects.

9mm (0.4lux outdoor) 22mm (0.4lux outdoor)

Focal Length

Matching Lens and Sensor

When an IP camera offers an exchangeable lens feature, selecting a suitable lens for the camera is one of the most important factor in order to fully utilize the camera’s capability. If a smaller lens is used instead of the one that actually fits the image sensor of the camera, the resulting image will have black corners (Left Image below). If a larger lens is used instead of the one that actually fits the image sensor of the camera, it will not fully utilize the lens’ field of view (Right Image below), and will have a smaller field of field than the lens’ capability.

1/2” Sensor

Black Corner

2/3” Lens 1/2” Lens 1/3” Lens

1/2” Sensor 1/2” Sensor

F-Number & Exposure

F-Number, also known as focal ratio, define light-gathering ability of a lens – the amount of light allowed to pass through the lens. F-Number, f/#, is the ratio of lens’ focus length to diameter of the lens aperture.

f/# = N = f/D f is focal length, and D is diameter of lens’ aperture. Common F-number on a lens

are f/1, f/2, f/4, f/8, etc. The lower the f-number, the more light can pass through the lens. This kind of lens perform better and produce higher quality image in low-light situation compared to lens with higher f-number.

F-number f1.0 f1.2 f1.4 f1.7 f2.8 f4.0 f5.6

% of light passed 20% 14.14% 10% 7.07% 2.5% 1.25% 0.625%


Manual or Automatic Iris

In camera, a diaphragm is an opaque structure with an aperture in its center to limit the amount of light that passes through the lens. Most of modern cameras use adjustable diaphragm called an iris diaphragm or often referred as an iris.

Manual Iris •  Lens with manual iris usually provides either a ring for users to

manually adjust the iris, or the iris is fixed at a specific f-number. •  Manual iris lens is most suitable for environments with constant light

level such as indoor environments. Automatic Iris

•  Lens with automatic iris, the aperture of the iris is automatically adjusted and controlled by the camera processor to maintain optimum light level to the image sensor. Generally, camera processor controls the automatic iris via direct current (DC) thus automatic iris is also known as DC-iris.

•  Automatic iris lens is most suitable for outdoor environment where the light level is constantly changing.


Day & Night Solution

Infrared LED is usually used for night surveillance, with camera set to allow Infrared (IR) light pass thru sensor to get night vision

Solution 1: With dual-band filter, cameras can be used during day time with visible light as well as for night time with IR light (extra IR LED illuminator required). This is the most entry level solution that can work in the day and at night, but sometimes its side effect may affect picture color for day time.

Solution 2: With ICR (Infrared-Cut Removable filter) module, it can use 2 filters for day and night time to provide better color performance, but at a higher cost.

Solution 3: Camera with built-in IR LED for illumination and dual-band or ICR filter to provide advanced functionality, usually known as an all-in-one camera.

Day & Night Solution - Light

Light perception •  Light is a form of radiation wave energy that exists in a spectrum. The

human eye can see, however, only a portion (between wavelengths of ~400 – 700 nanometers or nm).

•  The following illustration shows the wavelength where human eyes will not be able to see: outside the range to the left of the BLUE color below 400nm is the ultraviolet light, and outside the range to the right of the RED color above 700nm is the infrared light.

Day & Night Solution – IR-Cut Filter

IR cut coating in all camera •  Normal camera with coating filter allows only visible light to pass through •  Can’t see anything in night mode

Day & Night Solution - ICR

ICR (IR-Cut Removable) Lens •  Remove IR-cut filter during night time will give best results •  True day and night •  But more expensive

ICR Lens Module With ICR Without ICR

Day & Night Solution – Dual Band

Dual band coating to allow visible light and IR illumination to pass through.

Problem of dual band coating •  Sensors respond to both

visible light and infrared light •  White balance algorithm will

be affected by the infrared •  Image have color problem in

strong IR light environment

Filter glass.

Day & Night Solution – IR Camera

Structure of IR Camera •  With condenser, the distance of IR can reach up to two times

further than without.

Optical Condenser

IR LED

Day & Night Solution

Devices with con Dual-‐band filter: DCS-‐6110 DCS-‐7510 DCS-‐3420 DCS-‐7410 Devices with ICR (Infrared-‐Cut Removable filter): DCS-‐3110 DCS-‐3415 DCS-‐3430 DCS-‐3710 DCS-‐6505/6535 Devices with built-‐in IR LED & dual-‐band Filter or ICR Filter: DCS-‐5230 DCS-‐6111 DCS-‐7410 DCS-‐6511 DCS-‐7110

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.

Correct White Balance Incorrect White Balance

Wide Dynamic Range (WDR)

WDR is a new sensor technology for handling extreme variations of bright and dark conditions within the same scene, allowing it to function like the human eye which quickly adjusts to changing lighting conditions.

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.

Original Image BLC WDR

WDR Application

WDR sensor is capable of capturing both the dark and bright areas of a scene to combine the differences and generate a highly realistic image as the real scene.

As it preserves as much information within the video as possible, the WDR camera is able to provide video quality close to the capabilities of the human eye. It is largely applied in highly contrast environments such as lobby entrances, parking lots, ATM, loading areas and much more.

Normal Camera WDR Camera

Video Compression

Uncompressed or raw video data consumes very large amount of data storage and requires high bandwidth to transmit.

Video compression is a technique to reduce or remove some quantity of video data with acceptable quality so that the digital video can be stored or sent in an efficient size.

There are many compression technologies available in the market which may be proprietary or following industry standard. Most network vendors use standard compression technique to ensure compatibility and interoperability.

IP Surveillance Essential •  Compression

Video Codec

Video Codec (encoder/decoder) is a pair of algorithms used for compressing and/or decompressing digital video.

Different algorithms can be implemented in the same hardware or software which will allow multiple formats to coexist. Different algorithms however may not be compatible with each other, and video compressed with one algorithm usually cannot be decompressed using a different algorithm.

Some of the commonly used video codec include: •  MPEG-1 : used for Video CDs •  MPEG-2 : used for DVD, SVCD and most digital video

broadcasting and cable distribution system •  MPEG-4 : used for Internet, broadcast and storage media •  WMV: Microsoft’s family of video codec designs


Motion JPEG

Motion JPEG is a digital video sequence format that consist of a series of individual JPEG image. A series of image frames is considered as a motion video if 16 image frames or more are shown in one second. 30 (NTSC) or 25 (PAL) frames per second will be recognized as full motion video. Each image frame in the video sequence should have the same quality depending on the compression level. The higher the compression level, the lower the image quality and file size.


Frame 1 Frame 2 Frame 3

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MPEG-4

MPEG-4 is one of the licensed standard developed by MPEG (Moving Picture Experts Group), a committee formed by ISO to set standard for audio and video compression. One of the main advantage of MPEG-4 is that MPEG-4 offers high quality image with minimum file size thus MPEG-4 is suitable for low bandwidth application that requires high quality images. MPEG-4 uses an algorithm that compares a frame with its reference frame and only pixels that are different from the reference frame are coded.


Transmitted

Not Transmitted

H.264

H.264, also known as MPEG-4 part 10/AVC, is the latest MPEG video compression standard. Without affecting image quality, H.264 can reduce the size of a digital video file by more than 80% as compared with motion JPEG format, and by more than 50% as compared with MPEG-4 standard.

H.264 delivers excellent video quality across an entire bandwidth spectrum from 3G to HD and everything in between (from 40 Kbps to upwards of 10 Mbps).

The improved compression performance of H.264 comes at the price of greater computational cost. H.264 is more sophisticated than earlier compression methods.

The highly efficient compression technology of H.264 is expected to support the adaptation of higher performance network cameras such as megapixel camera.


MPEG-2 MPEG-4 H.264

Compression Format Comparison

Video Compression Type

MJPEG MPEG-4 H.264

Low bit rate streams No Yes Yes

Stream size @ 30fps D1 1800KBps 60KBps 60KBps

Stream size @ 2fps D1 60KBps 50KBps 50KBps

Compression quality Standard Good Excellent

Computational requirement

Low Medium High

Applications Security surveillance

DVD, Digital TV, Satellite TV, Personal

video recorders, mobile streaming, internet

streaming, camcorders

Security surveillance, video phone, video conferencing, digital

TV, satellite TV, mobile streaming

Frame Rate

Frame rate is the measurement of number of frames or images that an imaging device produces in one second.

Video with higher frame rate has a higher quality image and smoother object movement, but has a larger file size.

NTSC frame rate is 60 interlaced field per second or approximately 29.87 frame per second. (2 fields will combine into 1 frame)

PAL frame rate is 50 interlaced field per second or 25 frame per second. (2 fields will combine into 1 frame).


Audio Support

In traditional analog surveillance system, implementation of audio support needs two separate cables for audio and video data. IP surveillance supports audio implementation in the system. IP camera with audio support can process and send both audio and video data over the same IP network infrastructure for monitoring, recording or any other audio/video processing.

IP Surveillance Essential •  Audio

Audio Stream

Video Stream

Analog Surveillance System

Audio Stream

Video Stream

IP Surveillance System

DVR

Monitor

Analog Camera

IP Camera Management Server

IP Network

Audio Compression – Audio Codec

Advanced Audio Coding (AAC) •  Advanced Audio Coding (AAC) is a standardized encoding mechanism for

digital audio that uses lossy compression. AAC generally offers better sound quality than MP3 at many bit rates. AAC encoding compresses more efficiently and thus produces higher quality audio with smaller file sizes.

Adaptive Multi-Rate (AMR) •  Adaptive Multi-Rate (AMR) is an audio data compression scheme optimized for

speech coding. AMR is now widely used in GSM and UMTS. It uses link adaptation to select from one of eight different bit rates based on link conditions.

Adaptive Differential Pulse-Code Modulation (ADPCM)

•  ADPCM (adaptive differential pulse-code modulation) is a technique for converting sound or analog information to digital information by taking frequent samples of the sound and converting the value of the sampled sound modulation in binary terms. ADPCM is used to send sound on fiber-optic long-distance lines to store sound together with text, images, and codes to CD-ROM or other media.

Streaming Technologies

What is Streaming? •  Streaming provides the ability to grab multimedia data (i.e. audio, video, and other types of

multimedia) from a source or a streaming provider to deliver to the end user, which in the following illustration, is the user's computer.

Different technologies for data streaming: •  RTP (Real-time Transfer Protocol) •  RTCP (Real Time Control Protocol) •  RTSP (Real Time Streaming Protocol)

IP Networking Essential •  Local Area Network

Internal Multimedia server

Switch

Gigabit uplink to internal multimedia server

Client

Client

Client in the network streams multimedia data from the

multimedia server

Dual Stream / Multi-Profile

All the new cameras are featured with MPEG4 and MJPEG dual stream. It can stream 2 different stream with independent compression, resolution and frame rate. This will benefit end user to view the video from different site or device

•  e.g. one from PC, one from mobile phone

Multi-profile means the IP camera can stream more than 2 streams. Some of the new models support this feature.

•  e.g. Using CIF and MPEG4 for Web Viewing, QCIF and MPEG4 for 3G Mobile Viewing, and D1 and MJPEG for Recording

3GPP Video Streaming

Using this feature it is possible to remotely visualize IP camera live video on your 3G Phone. (eg. rstp://ipcameras.dlinkddns.com:559)

Bandwidth Needs

IP Surveillance system with less than 10 IP cameras can be implemented in 100 Mbps network without having to consider bandwidth limitation.

Implementing more than 10 IP cameras using gigabit backbone connection will provide better performance and prevent the IP surveillance system from overwhelming the network. This is because high quality image with high frame rate used by the IP Camera can use up to more than 2 to 3 Mbps of network bandwidth.

Calculating Storage Needs

H.264 and MPEG-4 calculation •  Mega bit per hour = approx. bit rate x 3600s

Resolution Image size (Kb) Frames per second

Mega bit per hour

Mega Byte per hour

CIF 104 15 5616 702 4CIF 320 15 17280 2160

Compression Type

Resolution Approx. bit rate (Kbps)

Mega bit per hour

Mega Byte per hour

H.264 CIF 110 396 49.5 4CIF 600 2160 270

MPEG-4 CIF 170 612 76.5 4CIF 880 3168 396

M-JPEG calculation •  Mega bit per hour = image size x frame per second x 3600s

Digital Input/Digital Output (DI/DO)

The following is a list of external devices that can be connected to the I/O connector of the D-Link IP Camera. •  DI interface:

•  Siren/Alarm relays •  PIR Motion Sensor •  Temperature sensor •  Simple on/off switch

•  DO interface: •  External light (Illuminator, etc) •  Any relayed control device

RS-485

RS-485 is a serial data communication protocol that allows multiple PTZ cameras on the same twisted pair cable to connect via serial connection for control from one camera to the next

RS-485 offers high data transmission speeds (Up to 35Mbps on 10 meters distance and up to 100Kbps on 1200 meters distance) and is able to cover relatively long distances (approximately 1200 meters)

When included with an IP camera, the RS-485 interface can be used for connecting the IP Camera to an external PTZ scanner

Power over Ethernet (PoE)

Power over Ethernet, with its standard protocol defined by IEEE 802.3af specification, delivers electrical power (DC voltage) over the same network cable of a device for sending data traffic. Certain models of D-link IP Cameras support Power over Ethernet (PoE) to provide more flexibility and easier implementation of the IP camera without the need to worry about finding a connection to nearest power supply. PoE is especially useful for scenarios where power supply is not available or is difficult to reach at the location where the IP Camera is to be installed.

PoE Switch

PoE IP Camera

Current electric Data traffic

With PoE support on the IP Camera, connection to power outlet is no longer needed. All that is needed is for the IP camera to be connected to a Switch with PoE built-in.

Data+ Power 48V

Power 48V + Data

Power 12V

Data

Power 12V

Datos

Switch PoE 802.3af (DES-‐1228P)

IP Camera DCS-‐5220

SpliWer

What we can do if the device is not PoE?

Event Triggered Recording

With event-based recording feature enabled, D-Link IP camera will automatically start recording every time specific event set by administrator occurs

Four types of event can trigger D-Link IP Camera to run an action as specified by the administrator such as to start recording. The events are:

•  Motion detection •  Digital input of external devices (e.g. PIR

motion sensor, alarm relays) •  Periodic schedule

•  Specifies the duration for action trigger to send out email of captured image for scheduled event

•  System boot •  System will trigger camera to run the

specified action at boot-up

Motion Detection

Motion detection feature, if enabled, will trigger the IP camera to send the snapshot/video clip to remote server (Email, FTP) or to record the event to local storage. How does motion detection in D-Link IP Camera works?

•  D-Link IP Cameras that support motion detection feature allow three different areas to be monitored for motion detection.

•  Sensitivity and Percentage parameters must be defined in order for the motion detection of the IP camera to work.

Figure A – Percentage Indicator

Figure B – How motion detection work

Front End Storage

Front end storage can store video at the camera for backup. It can stop storing after the disk is full or continuously overwrite to keep the latest data.

Currently it supports CF card, SD card or Micro SD card.

IP66 and IP44 (Environmental Certification)

The European Committee for Electro technical Standardization developed the Ingress Protection (IP) ratings (CENELEC) (described in IEC/EN 60529), which specifies the degrees of protection against the intrusion of solid objects to a piece of electrical equipment or enclosures.

The way in which the index and classification works is as follows: The IP will be made up of two numbers

•  The first states the level of mechanical protection from thing such as dust and other solid objects.

•  The second number indicates the degree of protection from water and other liquids. Examples of this certification are IP code 66 (total protection against dust, and also

against heavy water spray) and IP code 44 (protection against solid object over 1 mm and also against sprayed water from all direction).

Rule of IP Code – IP66 and IP44

0 No Protection

1 Protected against solid objects up to 50mm, e.g. accidental touch by hands.

2 Protected against solid objects up to 12mm, e.g. fingers.

3 Protected against solid objects over 2.5mm (tools and wires).

4 Protected against solid objects over 1mm (tools, wire, and small wires).

5 Protected against dust limited ingress (no harmful deposit).

6 Totally protected against dust.

0 No protection.

1 Protection against vertically falling drops of water e.g. condensation.

2 Protection against direct sprays of water up to 15° from the vertical.

3 Protected against direct sprays of water up to 60° from the vertical.

4 Protection against water sprayed from all directions. limited ingress permitted.

5 Protected against low pressure jets of water from all directions. limited ingress.

6 Protected against low pressure jets of water, e.g. for use on ship decks - limited ingress permitted.

7 Protected against the effect of immersion between 15cm and 1m.

8 Protects against long periods of immersion under pressure.

IP first number Protection against solid object

IP second number Protection against liquid

Wired-in Bracket

Wire-in bracket is designed to secure the camera’s wire and prevent it from damage

Vari-focal adjustment with outdoor housing

The focus and zoom control are located at the external of the enclosure for ease of adjustment.

Video Server (Encoder)

A video server (also referred to as video encoder) digitizes analog video signals and sends digital images directly over an IP network, such as a LAN, intranet or Internet It turns an analog video system into a network video system and enables users to view live images using a Web browser or a video management software on any local or remote computer on a network It allows authorized viewers from different locations to simultaneously access images from the same analog camera as well as network cameras if they are added to the system The Video Server is suitable as a solution for targeting the market which has existing analog CCTV cameras and looking into converting its CCTV into an IP-compatible surveillance system to provide users with remote access for video imaging through the LAN, Intranet or Internet.

Internet Remote User CCTV (Analog Camera)

Video Server

IP Camera

Training Videovigilancia IP: Capture

Technology

Transcript of Training Videovigilancia IP: Capture