Image processing system for teleconference system

• US 4,980,761 A
• Filed: 08/17/1989
• Issued: 12/25/1990
• Est. Priority Date: 08/17/1988
• Status: Expired due to Term

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Natori, Hiroaki
• Primary Examiner(s): Britton, Howard W.
• Assistant Examiner(s): Lee, Michael H.
• Application Number:
  US07/395,086
• Time in Patent Office: 495 Days
• Field of Search: 358/87, 358/181, 358/85, 358/210, 358/105, 358/133-138, 358/125, 358/108, 358/229, 358/146, 379/54, 379/53, 379/202, 379/203, 379/204, 379/205, 379/52, 379/53
• US Class Current: 348/14.08
• CPC Class Codes: H04N 19/152 by measuring the fullness of the transmission buffer
• CPC Class Codes: H04N 19/50 using predictive coding H04N19/61 takes precedence
• CPC Class Codes: H04N 19/503 involving temporal prediction adaptive coding with adaptive selection between spatial and temporal predictive coding H04N19/107; adaptive coding with adaptive selection among a plurality of temporal predictive coding modes H04N19/109
• CPC Class Codes: H04N 7/15 Conference systems

Abstract

A camera assembly is provided having a rotary camera and a fixed camera for outputting an image signal. A switching unit receives the image signal from the rotary and fixed cameras and switches between them. The rotary camera rotates on a rotary stand drive. A control unit receives an operation signal and a speaker position signal from an operation panel and a speaker detection unit, respectively. The control unit outputs drive signal and/or switch signal based on the operation signal and/or speaker position signal to control a compression rate. An image coding unit codes the image signal from the control unit and the switching unit. The image coding unit determines a fixed compression rate so as to place primary importance on a movement of the image until the image coding unit receives an operation completion signal from the control unit after receiving the operation notice signal.

Claims

1. An image processing system for a teleconference system comprising:

a camera assembly including a rotary camera and a fixed camera for outputting an image signal;

a switching means operatively connected to said rotary camera and said fixed camera, for receiving said image signal and switching between them;

a rotary stand drive means operatively connected to said rotary camera for rotating said rotary camera;

a control means operatively connected to an operation panel and a speaker detection means to receive an operation signal and a speaker position signal, and operatively connected to said rotary stand drive means and said switching means to output a drive signal and/or a switch signal based on said operation signal and/or said speaker position signal, said control means further generating an operation notice signal to control a compression rate at a timing when said operation signal or said speaker position signal is input thereto, and then, said drive signal and/or said switch signal is output therefrom; and

an image coding means operatively connected to said control means and said switching means for coding said image signal, said image coding means further determining a fixed compression rate so as to place primary importance on a movement of said image until said image coding means receives an operation completion signal from said control means after receiving said operation notice signal.

2. An image processing system as claimed in claim 1, wherein said control means comprises a first OR gate for generating said operation notice signal to said image coding means based on said operation signal and said speaker position signal, a second OR gate for receiving a mode fixing completion signal from said image coding means, and a third OR gate for outputting said operation completion signal.

3. An image processing system as claimed in claim 1, wherein said control means further comprises a first timer for receiving said operation notice signal and outputting a time out signal after a predetermined time has lapsed, and a second timer for receiving said switch signal and outputting a time out signal after a predetermined time has lapsed.

4. An image processing system as claimed in claim 1, wherein said image coding means comprises a parameter decision unit for receiving said operation notice signal, generating a parameter control signal for determining said fixed compression rate, and generating said mode fixing completion signal to said control means after receiving said operation completion signal.

5. An image processing system as claimed in claim 2, wherein said control means further comprises a first timer for receiving said operation notice signal and outputting a time out signal after a predetermined time has lapsed, and a second timer for receiving said switch signal and outputting a time out signal after a predetermined time has lapsed.

6. An image processing system as claimed in claim 2, wherein said image coding means comprises a parameter decision unit for receiving said operation notice signal, generating a parameter control signal for determining said fixed compression rate, and generating said mode fixing completion signal to said control means after receiving said operation completion signal.