cnlab ag, Ob. Bahnhofstrasse 32b, 8640 Rapperswil, Tel: +41 55 214 3333, Fax: +41 55 214 3334

cnlab LiveCam: Mode of Operation

[ Overview | System | Mode of Operation | Tech Specs ]
 

cnlab LiveCam

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The cnlab LiveCam system consists of a PC based, dedicated web server which is reading and remotely controlling a motorized color video camera. The camera is connected to the server with a video (koaxial 75 ohm) and a serial cable (shielded signal cable). The LiveCam Server is permanently connected to the internet.

The cnlab LiveCam System is available for indor or outdoor operation.

cnlab LiveCam Proxy Server

The cnlab LiveCam Proxy Server on its outside interface presents a standard cnlab LiveCam Server. On the 'inside interface' it interacts with the pre-configured "real" cnlab LiveCam. This way only one single video stream is transmitted from LiveCam to the LiveCam Proxy Server. Many video streams are possible to users which connect to the Proxy Server. This way LiveCam installations can be connected to the Interne via low capacity feeds.

The cnlab LiveCam Proxy Server can be used to provide a virtually unlimited number of simultaneous video streams (users).

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The cnlab LiveCam Proxy Server helps to connect LiveCam installations within secure networks to the Internet.

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Snapshot Mode

The LiveCam System can be set up for single snapshot pictures and/or for video streams (server push) according to customer's needs. Both setups can be interactively controlled via the Internet.

In Snapshot Mode the user clicks on a camera position and receives a new static image.

Each snapshot request needs 5 to 10 seconds for positioning the camera (and digitizing the image). If there are simultaneous requests, they are processed in the order they are received.

Video Mode

In streaming Video Mode all connected users see the same moving image and everyone can move the camera.  The systems provides for limiting the number of users which obtain control.

The streaming Video is transmited in M-JPEG format and is directly displayed as image (Server Push) or with a Java-Applet, depending on your browser type.

Control Modes

The camera can be controlled by

  • clicking into the actual picture
  • a predefined overview image
  • a predefined panorama picture
  • preset fixed positions
  • control links / buttons

Requirements

The LiveCam Server has to be permanently reachable via Internet. Normally, this requires a leased line connection and fixed IP-addresses.

The required internet bandwidth depends on mode of operation:

Snapshot Mode

The standard internet bandwidth requirement is 60 kbps if the the camera is heavily used. Normally the actually used bandwidth is lower.

Approx. average bandwidth:

images per day 320 x 240 Pixel
(default)		 640 x 480 Pixel
100 0.2 kbps 0.6 kbps
1'000 2 kbps 6 kbps
5'000 10 kbps 30 kbps
10'000 20 kbps 60 kbps

Video Mode

The required internet bandwidth depends on image resolution, frame rate and number of simultaneous users. Normally the system is set up for a bandwidth of approx. 50 kbps per stream (or user), this permits a resolution of 240 x 180 pixel with 2 frames per second.

Approx. 'peek' bandwidth:

max. users 160 x 120 Pixel, 2 frames/sec 240 x 180 Pixel, 2 frames/sec
(default)
1 30 kbps 50 kbps
5 150 kbps 250 kbps
10 300 kbps 500 kbps
50 1.5 Mbps 2.5 Mbps
100 3 Mbps 5 Mbps
500 15 Mbps 25 Mbps

Higher resolution and frame rate up to 320 x 240 pixel with 8 frames/sec. is possible if the required bandwidth is available.

 

cnlab ag 

Ob. Bahnhofstrasse 32b, CH-8640 Rapperswil

 +41 55 2143333

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30.04.2007 © cnlab AG