Worzyk FH Anhalt Telemedizin WS 03/04 Einführung - 1 Video Conference

Worzyk FH Anhalt Telemedizin WS 03/04 Einführung - 2 Definition A video conference is a virtual meeting of two or more spatially separated dialogue partners, which can communicate in real time over audio and video with each other. At the same time all data (audio, video, text) can be digitized, handled simutanously and exchanged among the partners.

Worzyk FH Anhalt Telemedizin WS 03/04 Einführung - 3 components Camera – Display –Transmission of moving pictures in real time Microphone – Loudspeaker –Transmission of sound in real time Chat –Written Communication Whiteboard –Concurrent drawing, writing, inserting Share programs –using Word, PowerPoint from the partner Transfer of data –Transfer of any data

Worzyk FH Anhalt Telemedizin WS 03/04 Einführung - 4

Worzyk FH Anhalt Telemedizin WS 03/04 Einführung - 5 Transmission Codec Codierer/Decodierer Codec Codierer/Decodierer ISDN IP

Worzyk FH Anhalt Telemedizin WS 03/04 Einführung - 6 reduction of data MPEG motion pictures expert group Spatial redundancy Areas with same brightness and color can be summarized. The first pixel is accurately transferred, then an instruction for the repetitions follows

Worzyk FH Anhalt Telemedizin WS 03/04 Einführung - 7 reduction of data MPEG Temporal redundancy Some parts in the scene do not change from one pictuer to the next picture. So it is only necessary to transmit the changing parts of the

Worzyk FH Anhalt Telemedizin WS 03/04 Einführung - 8 reduction of data MPEG Statistical Redundancy Prediction Movements which are known from the past are predicted to the future and only unpredictable parts of the picture are transmitted,

Worzyk FH Anhalt Telemedizin WS 03/04 Einführung - 9 reduction of data MPEG Datastream Intra picture: compleate picture reduced by Spatial redundancy Predicted picture: predicted by a previous picture Bidirectional predicted picture : predicted or calculated by previous and subsequent pictures. I B BP B BP B BI

Worzyk FH Anhalt Telemedizin WS 03/04 Einführung H.323 Terminal H.323 Terminal H.323 Terminal ISDN Terminal

Worzyk FH Anhalt Telemedizin WS 03/04 Einführung - 11 Videoconferencing Room

Worzyk FH Anhalt Telemedizin WS 03/04 Einführung - 12

Worzyk FH Anhalt Telemedizin WS 03/04 Einführung - 13 Examples BremerhavenBerlin Duisburg Garching

Worzyk FH Anhalt Telemedizin WS 03/04 Einführung - 14 interior design Sufficient seats, visible from the camera Display must be visible from each seat No blind area Sufficient lightning, no mixed light (blue daylight and red bulb light) Acoustic shielding Monochrome, neutral background

Worzyk FH Anhalt Telemedizin WS 03/04 Einführung - 15 Video Camera to track the speaker should be movable with programmable positions Document camera or presentation camera should be movable For each camera one display at the own and at the remote site Speakers camera should be directly above the assigned display Control panel

Worzyk FH Anhalt Telemedizin WS 03/04 Einführung - 16 Audio Shield external sound source –Traffic, engines, elevators, Air conditions, Avoid reverberation in the interior Same distance to the microphone for each speaker A single person should use a headset High quality loudspeakers Mixer

Worzyk FH Anhalt Telemedizin WS 03/04 Einführung - 17 Lighting Illumination uniformity of the room Diffuse light No cast shadow No reflection on the displays No direct light to the camera

Worzyk FH Anhalt Telemedizin WS 03/04 Einführung - 18 During the conference The sound may come in delay (probably use a seperate sound connection) eye contact is not possible, so position camera and monitor as close as possible side by side Inform the partner about each action –Turning off the micro, freeze image, someone is leaving or comming, … Little gesture

Worzyk FH Anhalt Telemedizin WS 03/04 Einführung - 19 Examples

Worzyk FH Anhalt Telemedizin WS 03/04 Einführung - 20 Installation of NetMeeting Check headphone or loudspeaker Connect the microphone Check the microphone CAll NetMeeting –No registration to the directory server Connect to the partner via IP address

Worzyk FH Anhalt Telemedizin WS 03/04 Einführung - 21 Weitere Informationen bochum.de/rz/dienste/internet/vkonf/ hmenbedingungen_ pdf

Worzyk FH Anhalt Telemedizin WS 03/04 Einführung - 22 Videoconference systeme in our Department NetMeeting –One camera –ein microphone (Sound in one direction) –Transmission of Presentation Shared Whiteboard Chat

Worzyk FH Anhalt Telemedizin WS 03/04 Einführung - 23 Videoconference systeme in our Department Interkom + Polycom 2 movable Cameras Camera controll 6 Microphones Microphone controll

Worzyk FH Anhalt Telemedizin WS 03/04 Einführung - 24 Konferenzschaltung Interkom Polycom Internet