Video Conference Camera And Tracking System

Video conference camera and tracking system

1. Classification and composition

The video conference camera system is divided into venue camera and tracking camera. It is usually composed of image acquisition, image transmission, image processing and image display. The image acquisition part can be composed of video conference cameras, decoders, and supports. The image transmission part can consist of transmission cables. The image processing part can be composed of a video distributor, a video switcher, a control host (including software), a control keyboard, and the like. The image display portion can be composed of various display devices.

2. Video conference camera requirements

(l) The tracking camera should have a preset function, and the number of preset positions should be greater than the number of speakers.When the preset position is less than the number of speakers, it can be expanded by an external controller; for example, the keyboard is operated and the camera linkage controller is operated. In general, each conference unit that has a speaking function needs a preset position, that is, pre-stored PTZ camera positioning information. It is also possible to set up preset positions only for some conference units, such as conference units on the rostrum. If no one speaks or a person speaks together, the conference camera should give a panoramic image.

(2) The video conference camera lens should be designed with a fixed focus lens or zoom lens depending on the size of the camera surveillance area.

(3) The videoconferencing camera lens should have aperture automatic adjustment function.

(4) The horizontal resolution of analog black-and-white cameras should not be lower than 570 lines, and the horizontal resolution of color cameras should not be lower than 480 lines.

(5) The horizontal and vertical resolution levels of standard definition digital videoconferencing cameras shall not be less than 450 velvet, and the horizontal and vertical resolution of high-definition digital conference cameras shall not be less than 720 lines. For 100 tracking cameras, the maximum rotation speed of the pan tilt should not be lower than 260 degrees per second, and the vertical maximum rotation speed should not be lower than 100 degrees per second.

(6) Video Conferencing Cameras PTZ should select low-noise products.

(7) The video conference camera PTZ PSNR should not be less than 50dB.

(8) The minimum illumination of the video conference camera should not be greater than 1. OLUX.

(9) PTZ camera call preset offset should not be greater than o. 1. .

(10) When the speaker turns on the microphone, the camera tracking camera should automatically track the speaker, and automatically zoom in and link the video display device to display the speaker's image.

(11) The system should have automatic power-off memory function.

(12) The video conference camera system uses the video control software to set the correspondence between the camera presets and the conference unit.

3. System requirements for equipment

(1) The selection of video switchers should meet the following requirements:

1.The number of video input/output channels should meet the needs of the system, and 20% of redundancy should be reserved and the logic matrix function can be implemented.

2.The general communication protocol should be supported to connect and control high-speed PTZ cameras.

3.should have a video signal doubler function, can convert composite video, S-VIDEO signal to high-quality VGA signal.

4.It is recommended that the toilet surface is stationary, frozen, and synchronized.

5.should have a screen character display function, which can represent the name and other information in the preset position.

6.The amplitude and frequency characteristics, random noise/noise ratio, differential gain and differential phase of the video switcher shall comply with the relevant provisions of Article 8.4.8 of this specification.

(2) The selection of PTZ cameras should meet the following requirements:

1.Video conference camera resolution should be higher than the system requirements display resolution.

2. declared with preset function.

3. should have optical zoom and electronic zoom.

4 .should have aperture automatic adjustment function.

5.PAL and NTSC video signals should be supported.