IP camera: Difference between revisions
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* Progressive scan (versus interlaced scanning). Allows still-images to be removed in better quality from a video feed and can render clearer images from a fast moving target (interlaced scanning will have shutter-blind artifacting). Not all IP cameras are progressive scan. Progressive scan are available with both CMOS image sensors and CCD sensors. |
* Progressive scan (versus interlaced scanning). Allows still-images to be removed in better quality from a video feed and can render clearer images from a fast moving target (interlaced scanning will have shutter-blind artifacting). Not all IP cameras are progressive scan. Progressive scan are available with both CMOS image sensors and CCD sensors. |
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* No additional hardware required to convert vision signal into computer domain for recording onto hard drives. |
* No additional hardware required to convert vision signal into computer domain for recording onto hard drives. |
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* It's very easy to add one camera at a time to the system. |
* It's very easy to add one camera at a time to the system.<ref>http://www.imakenews.com/kin2/e_article000654641.cfm?x=b8v5FDQ,b25tl0b3,w</ref> |
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'''Disadvantages''' |
'''Disadvantages''' |
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*The range of IP cameras is somewhat limited when compared to analog CCTV (although this is beginning to change quickly). |
*The range of IP cameras is somewhat limited when compared to analog CCTV (although this is beginning to change quickly). |
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*Lack of standards for IP Video protocol. Not all IP cameras send video the same way and this means only certain cameras work with certain IP video recording solutions (which again further limits the range of cameras that can be chosen for an installation). Analog CCTV has practically one standard of transmission (being either PAL or NTSC depending on the world region). |
*Lack of standards for IP Video protocol. Not all IP cameras send video the same way and this means only certain cameras work with certain IP video recording solutions (which again further limits the range of cameras that can be chosen for an installation). Analog CCTV has practically one standard of transmission (being either PAL or NTSC depending on the world region). |
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*High network bandwidth requirements: typical CCTV camera with |
*High network bandwidth requirements: typical CCTV camera with resolution 640x480 and 10fps in MJPEG mode requires about 3 Mbit/s<ref>[http://www.jvsg.com/bandwidth-storage-space-calculation/ Network bandwidth and video storage space calculation] by JVSG, January 17, 2008</ref>. |
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*Latency: the stream encoded at the camera source takes time to travel to the server. |
*Latency: the stream encoded at the camera source takes time to travel to the server. |
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Revision as of 14:49, 19 November 2008
 |
 Outdoor Megapixel IP camera | |
| Media type | Internet Protocol |
|---|---|
| Encoding | MJPEG |
| Capacity | 30+ fps |
| Developed by | IQinvision |
| Usage | video transmission |
 IP Camera | |
| Media type | Internet Protocol |
|---|---|
| Encoding | MJPEG and MPEG4 |
| Capacity | 30+ fps |
| Developed by | Axis Communications |
| Usage | video transmission |
 Video motion detection IP Camera | |
| Media type | Internet Protocol |
|---|---|
| Encoding | MJPEG and H.264 |
| Capacity | 30+ fps |
| Developed by | Lumenera |
| Usage | video transmission |
IP video surveillance can be defined as the transmission of video utilizing open internet protocols and standards for the purpose of recording and monitoring. This should not be confused with more proprietary methodologies of transmitting video in which only the manufacturer of the camera can decode the video for the purpose of recording and/or display.
The first IP camera was released in 1996 by Axis Communications, and it utilized an embedded Linux platform internal to the camera. Axis also released documentation for their low-level API called "VAPIX" which builds on the open standards of HTTP and RTSP. This open architecture encouraged third-party software manufacturers to develop management and recording software resulting in exponential growth of the IP video surveillance market.
As with still digital cameras, resolution are increasing all the time. multi-megapixel IP-CCTV cameras are now available at resolutions of 1, 2, 3, 5 and even 11 megapixels. This said, affordable lenses that can deliver sharp enough images for cameras of 5Mpix and above are not yet available
Some of the advantages of IP-based video surveillance include:
- Reduced system cost and added functionality due to general-purpose IP networking equipment infrastructure.
- Choice of open-platform video recording hardware and software.
- Greatly reduced system cost due to low-cost cabling in large installations (CAT5e instead of RG-59 coaxial cable).
- Ability to use Power over Ethernet allowing for one cable to handle power and data.
- Flexible and seamless support for a variety of standard and multi-megapixel image resolutions way beyond NTSC, PAL and SECAM.
- Transmission of commands for PTZ (pan, tilt, zoom) cameras via the same cable.
- On-camera automated alerting via email or file transfer in response to video motion detection or dry-contact alarms.
- Support for different streaming media and compression formats to relieve transmission bandwidth and data storage requirements.
- Support for new embedded intelligent video motion detection with shape recognition/counting applied to objects, people, and vehicles.
- Integration of video surveillance with other systems and functions such as access control, alarm systems, building management, traffic management, etc.
- Future-proof installations with field-upgradeable products due to the ability to upgrade camera firmware over the network.
Today there are many vendors of IP cameras and many vendors for digital video recorders and network video recorder (NVR) software. IP surveillance equipment vendors typically include both specialized digital imaging equipment manufacturers and larger manufacturers that are active in consumer, broadcast, and security video.
Some specific advantages and disadvantages of IP cameras
Advantages
- Higher resolution. Megapixel cameras can far exceed image detail from conventional CCTV cameras.
- Convergence onto existing IP cabling infrastructure
- Easy to route long distances over existing IP infrastructure on multibuilding sites
- Reduced space requirements in large (many camera) CCTV setups because video switching and routing is done via computer and does not need physically large and expensive video matrix switchers.
- Progressive scan (versus interlaced scanning). Allows still-images to be removed in better quality from a video feed and can render clearer images from a fast moving target (interlaced scanning will have shutter-blind artifacting). Not all IP cameras are progressive scan. Progressive scan are available with both CMOS image sensors and CCD sensors.
- No additional hardware required to convert vision signal into computer domain for recording onto hard drives.
- It's very easy to add one camera at a time to the system.[1]
Disadvantages
- IP cameras tend to have an initial higher cost (yet in many cases have a lower system implementation cost).
- The range of IP cameras is somewhat limited when compared to analog CCTV (although this is beginning to change quickly).
- Lack of standards for IP Video protocol. Not all IP cameras send video the same way and this means only certain cameras work with certain IP video recording solutions (which again further limits the range of cameras that can be chosen for an installation). Analog CCTV has practically one standard of transmission (being either PAL or NTSC depending on the world region).
- High network bandwidth requirements: typical CCTV camera with resolution 640x480 and 10fps in MJPEG mode requires about 3 Mbit/s[2].
- Latency: the stream encoded at the camera source takes time to travel to the server.