Method and device for the continuous transmission of a video in a communication network

• US 20050198676A1
• Filed: 12/13/2004
• Published: 09/08/2005
• Est. Priority Date: 12/22/2003
• Status: Active Grant

• Current Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Original Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Inventors: Henocq, Xavier, Le Leannec, Fabrice
• Granted Patent: US 8,397,265 B2
• Time in Patent Office: Days
• US Class Current: 725/86
• CPC Class Codes: H04N 19/17 the unit being an image region, e.g. an object
• CPC Class Codes: H04N 21/2662 Controlling the complexity of the video stream, e.g. by scaling the resolution or bitrate of the video stream based on the client capabilities
• CPC Class Codes: H04N 21/4402 involving reformatting operations of video signals for household redistribution, storage or real-time display details of conversion of video standards at pixel level H04N7/01; video transcoding H04N19/40; adapting incoming signals to the display format of the display terminal G09G5/005; media handling at the source in data packet switching networks H04L65/764
• CPC Class Codes: H04N 21/4621 Controlling the complexity of the content stream or additional data, e.g. lowering the resolution or bit-rate of the video stream for a mobile client with a small screen arrangements for using the results of monitoring on user's side in broadcast systems H04H60/65; flow control in packet networks H04L47/10
• CPC Class Codes: H04N 21/4728 for selecting a Region Of Interest [ROI], e.g. for requesting a higher resolution version of a selected region
• CPC Class Codes: H04N 21/6373 for rate control , e.g. request to the server to modify its transmission rate flow control in packet networks H04L47/10
• CPC Class Codes: H04N 21/6377 directed to server one-way streaming services wherein the source is controlled by the destination H04L65/613
• CPC Class Codes: H04N 21/6405 Multicasting data broadcast and multicast in packet switching networks H04L12/18
• CPC Class Codes: H04N 21/64792 Controlling the complexity of the content stream, e.g. by dropping packets intermediate media network packet handling H04L65/765; proxy provisioning conversion or adaptation for reducing the amount or size of exchanged application data H04L67/5651; negotiation of resources in wireless networks H04W28/16

Abstract

The invention relates to a method for the continuous transmission of a video from a server to a number of client machines over a communication network, comprising the following steps: obtaining requests from client machines, at least some of the requests obtained each specifying at least one spatial zone of interest in one or more images of the video, a spatial zone representing a set of digital data, processing the requests obtained so as to determine one or more intersections defining common data between the spatial zones of interest of the video, creating a multipoint network session for each intersection thus determined.

Claims

1. A method for the continuous transmission of a video from a server to a number of client machines over a communication network, comprising:

obtaining requests from client machines, at least some of the requests obtained each specifying at least one spatial zone of interest in one or more images of the video, a spatial zone representing a set of digital data,

processing the requests obtained so as to determine one or more intersections defining common data between the spatial zones of interest of the video,

creating a multipoint network session for each intersection thus determined.

2. A method according to claim 1, further comprising a step of point-to-point transmission over the network, from the server, of a description of the content of each multipoint network session designed to inform each client machine.

3. A method according to claim 2, further comprising a step of obtaining a request to subscribe one of the client machines to a subset or to the entire set of the multipoint sessions created by the server, this subset or entire set being designed to transport the data that meets the initial request from the client machine, said subscription request being transmitted by said client machine after the latter has consulted the description of the content of at least one multipoint network session.

4. A method according to claim 3, further comprising a step of transmitting to the client machine in question data transported by the subset or entire set of multipoint network sessions.

5. A method according to claim 1, further comprising a step of creating at least one multipoint or point-to-point network session for the data that are not contained in the intersections determined.

6. A method according to claim 5, further comprising a step of transmitting to the client machines in question data that are not contained in the intersections determined.

16. An information storage means which can be read by a computer or microprocessor, comprising code instructions for a computer program for executing the steps of the method according to claim 1.

17. An information storage means which can be partially or completely removed and can be read by a computer or microprocessor, comprising code instructions for a computer program for executing the steps of the method according to claim 1.

18. A computer program that can be loaded onto a programmable apparatus, comprising sequences of instructions or portions of software code for implementing the steps of the method according to claim 1, when said computer program is loaded onto and run on the programmable apparatus.

7. A device for the continuous transmission of a video from a server to a number of client machines over a communication network, the device comprising:

means for obtaining requests from client machines, at least some of the requests obtained each specifying at least one spatial zone of interest in one or more images of the video, a spatial zone representing a set of digital data,

means for processing the requests obtained so as to determine one or more intersections defining common data between the spatial zones of interest of the video,

means for creating a multipoint network session for each intersection thus determined.

8. A device according to claim 7, further comprising means for the point-to-point transmission over the network, from the server, of a description of the content of each multipoint network session designed to inform each client machine.

9. A device according to claim 7, wherein the multipoint network session comprises a multipoint address in the network.

10. A device according to claim 9, wherein the multipoint address corresponds to the address of a multipoint router of the network.

11. A device according to claim 8, further comprising means for obtaining a request to subscribe one of the client machines to a subset or to the entire set of the multipoint sessions created by the server, this subset or entire set being designed to transport the data that meets the initial request from the client machine.

12. A device according to claim 11, further comprising means for transmitting to the client machine in question data transported by the subset or entire set of multipoint network sessions.

13. A device according to claim 7, further comprising means for creating at least one multipoint or point-to-point network session for the data that are not contained in the intersections determined.

14. A device according to claim 13, further comprising means for transmitting to the client machines in question data that are not contained in the intersections determined.

15. A communication apparatus comprising a device according to claim 7.