WO2009004567A2 - Systèmes de transmission vidéo - Google Patents

Systèmes de transmission vidéo Download PDF

Info

Publication number
WO2009004567A2
WO2009004567A2 PCT/IB2008/052623 IB2008052623W WO2009004567A2 WO 2009004567 A2 WO2009004567 A2 WO 2009004567A2 IB 2008052623 W IB2008052623 W IB 2008052623W WO 2009004567 A2 WO2009004567 A2 WO 2009004567A2
Authority
WO
WIPO (PCT)
Prior art keywords
video
unit
transmission system
baby
mpeg
Prior art date
Application number
PCT/IB2008/052623
Other languages
English (en)
Other versions
WO2009004567A3 (fr
Inventor
Lincoln S. Lobo
Frank A. M. Van De Laar
Jan Van Wijgerden
Wilhelmus J. J. Stut
Original Assignee
Koninklijke Philips Electronics N.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2009004567A2 publication Critical patent/WO2009004567A2/fr
Publication of WO2009004567A3 publication Critical patent/WO2009004567A3/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
    • H04N7/183—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast for receiving images from a single remote source
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
    • H04M1/725—Cordless telephones
    • H04M1/72502—Cordless telephones with one base station connected to a single line
    • H04M1/72505—Radio link set-up procedures
    • H04M1/72513—On hold, intercom or transfer communication modes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2250/00—Details of telephonic subscriber devices
    • H04M2250/08—Details of telephonic subscriber devices home cordless telephone systems using the DECT standard

Definitions

  • the invention relates to video transmission systems, and in particular to a system and method for wirelessly communicating video and audio information from a transmitter to a receiver, with specific application to baby monitoring systems.
  • Baby monitoring systems are becoming increasingly popular, and these systems generally comprise a baby unit that is placed close to a baby or child to be monitored, and a parent unit that communicates with the baby unit to provide a parent with information about the status of their baby.
  • the most common baby monitor systems have a microphone in the baby unit for picking up sounds (such as the baby crying), and these sounds are sent to the parent unit where they are broadcast for the parent to hear.
  • the parent unit can also or alternatively include a visual indicator, such as a series of lights, which gives the parent a visual indication of the level of noise at the baby unit.
  • Other types of baby monitoring systems are available in which the baby unit includes a video camera for providing a video feed to the parent unit.
  • Baby monitoring systems provide a video feed from the baby unit to the parent unit using a radio link in the 2.4 GHz band to carry an analog television signal (for example PAL or NTSC format) from the baby unit to the parent unit.
  • analog television signal for example PAL or NTSC format
  • these baby monitoring systems are susceptible to interference from other household devices including microwave ovens, WiFi devices, Bluetooth devices and amateur radio transmissions.
  • these monitoring systems suffer from a relatively limited transmission range, and provide little privacy protection for the transmitted video feed.
  • Baby monitoring systems that use WiFi can overcome some of these problems, but as they also use the 2.4 GHz band (if the devices are in accordance with the IEEE 802.11 b/g/n standards), there is still a high risk of interference.
  • a video transmission system uses a combination of communications in accordance with the Digital Enhanced Cordless Telecommunications (DECT) standard and video compression using MPEG-4 compression techniques.
  • DECT Digital Enhanced Cordless Telecommunications
  • MPEG-4 allows good picture quality, relatively free of coding artefacts at the bit rates permitted using the DECT protocol.
  • the use of MPEG-4 transmission efficiency tools increases the robustness of the transmission against bit stream errors.
  • DECT Digital Enhanced Driver Assistance Systems
  • specific embodiments of the invention provide that the audio and video components of the feed are transmitted in separate streams. In this way, it is possible for the system to operate in an audio-only mode if the bandwidth available in the communication link between the devices is reduced, or if it is desirable or necessary to reduce the power consumption of the transmitting and/or receiving devices.
  • a video transmission system in which a video stream is transmitted from a first unit to second unit, wherein the first unit is adapted to compress the video stream using MPEG-4 video compression techniques and to transmit the compressed video stream to the second unit in accordance with the DECT communication standard.
  • the first unit is adapted to transmit an audio stream from the first unit to the second unit in accordance with the DECT communication standard.
  • the audio and video are transmitted in respective DECT time slots.
  • the first unit is adapted to transmit only the audio stream in the event that an insufficient number of DECT time slots are available in the DECT communication channel.
  • the first unit is adapted to cease the compression and transmission of the video stream in the event that a power-saving mode of the first unit is required.
  • the first unit is adapted to compress the video stream using MPEG- 4 transmission efficiency tools.
  • the MPEG-4 transmission efficiency tools are selected from a video packet tool, data partitioning tool and a reversible variable length code tool.
  • the video transmission system is a baby monitoring system
  • the first unit is a baby unit for use in the vicinity of a baby or child
  • the second unit is a parent unit for use in the vicinity of a parent or carer of the baby or child.
  • the video transmission system is a video conferencing system.
  • the second unit is adapted to transmit a respective video stream to the first unit, wherein the second unit is adapted to compress the respective video stream using MPEG-4 video compression techniques and transmit the compressed video stream to the first unit in accordance with the DECT communication standard.
  • a method of operating a first unit in a video transmission system comprising compressing a video stream using MPEG-4 compression techniques; and transmitting the compressed video stream to a second unit in accordance with the DECT communication standard.
  • a communication system in particular a baby monitoring system, arranged for using, in video monitoring and video conferencing applications, of a combination of DECT communication standard with MPEG-4 video compressing techniques.
  • the communications system is arranged for selectively enabling the transmission of video data in dependence of the available bandwidth.
  • a method for communication of audio and video data by combining DECT communication standard with MPEG-4 video compression techniques.
  • the invention will now be described in the form of a baby monitoring system that comprises a parent unit and baby unit in which a video feed is provided from the baby unit to the parent unit, it will be appreciated that the invention is equally applicable to other types of devices that provide wireless transmission of video feeds over a medium range (of the order of a few hundred meters), and in particular to systems in which a video feed is transmitted from each device. Such devices can be used in video conferencing applications.
  • FIG. 1 shows a block diagram of a baby monitoring system 2 in accordance with an aspect of the invention.
  • the system comprises a transmission unit 4 in the form of a baby unit that is placed in the vicinity of a baby or child to be monitored, and a receiving unit 6 that is carried or used by a parent remotely from the baby unit 4.
  • the baby unit 4 comprises a camera 8 for recording video images of the baby, a microphone 10 for recording audio in the vicinity of the baby unit 4, and one or more other sensors 12 for sensing conditions at the baby unit 4, such as temperature.
  • the data from the camera 8 is provided to an encoder 14 where it is processed in accordance with MPEG-4 compression techniques.
  • the compressed video data, along with the audio data from the microphone 10 and data from the sensors 12, is provided to transmission circuitry 16 for transmission (via an antenna 18) over an air interface in accordance with the DECT protocol.
  • the parent unit 6 receives the transmissions from the baby unit 4 via an antenna 20 and receiver circuitry 22.
  • the receiver circuitry 22 provides the received video data to a decoder 24 that processes the MPEG-4 compressed data to recover the video data.
  • the video data which can include a visual output indicating the measurements from the sensors 12 (for example a temperature indication that is superimposed on the video images), is then provided to a visual display unit (VDU) 26 for display to the user of the parent device 6.
  • VDU visual display unit
  • the audio data is provided from the receiver circuitry 22 to a speaker or speakers 28 for presentation to the user of the parent device 6.
  • the parent unit 6 can also include a separate visual indicator 30 for indicating the level of noise recorded by the baby unit 4.
  • a separate visual indicator 30 for indicating the level of noise recorded by the baby unit 4.
  • a series of lights can be provided on the parent unit 6, with more lights being lit as the level of noise increases.
  • the system 2 may have a talk back function, which allows a user of the parent unit 6 to transmit audio to the baby unit 4.
  • the parent unit 6 is provided with a respective microphone and transmitter circuitry for sending the audio data to the baby unit 4, and the baby unit 4 is provided with receiver circuitry and a respective speaker for playing the audio.
  • DECT Digital Enhanced Cordless Telecommunications
  • DECT was developed for cordless telephony applications and provides interference- free wireless operation up to a range of around a couple hundred meters.
  • DECT systems can operate substantially interference free in common congested domestic radio traffic situations, and is generally immune to interference from equipment using the unlicensed 2.4 GHz frequency band.
  • the radio spectrum is divided into physical channels in two dimensions: frequency and time. Typically, one time slot is used for a voice/audio connection, and this provides a net bit rate of 32 kbit/s. The use of additional time slots provides the option for ancillary data transmission, such as video data.
  • CAT-iq stands for Cordless Advanced Technology- Internet and quality. Although CAT-iq has been promoted for use in very high-quality voice telephony, music streaming and Internet browsing applications, it has been realized that CAT-iq can also be extended to video streaming applications.
  • bit rates of up to 320 kbit/s are possible using a DECT wireless link.
  • Video quality in such a system depends on a series of parameters, and in particular video resolution and frame rate. In a baby monitoring system, the amount of movement in the video images is typically relatively limited (when compared with other video content such as movies or sports). Even so, in order to provide smooth motion, a frame rate of at least 10 frames per second is recommended, although a higher frame rate is preferred.
  • the typical display size in a baby monitoring system application is relatively small (a typical size is between 3.5 cm and 8 cm), which helps to limit the minimum video resolution required to achieve a good picture quality.
  • the Quarter Common Intermediate Format (QCIF) resolution (144 x 176 pixels at 30 frames per second) is considered to be an acceptable minimum.
  • the invention is based on the realization that given these requirements, the use of MJPEG, MPEGl or MPEG2 compression results in video being received at the parent unit 6 with significant amounts of coding artefacts.
  • MPEG-I and MPEG-2 in particular are very sensitive to bit stream errors.
  • MPEG-4 compression techniques are used, an in particular either MPEG-4 part 2 (ASP/SP) or MPEG- 4 part 10 (AVC). It is considered that MPEG-4 part 2 provides an acceptable video quality at a relatively low cost, but it is also considered that low cost implementations of MPEG-4 AVC codecs provide an even better picture quality.
  • MPEG4 transmission efficiency tools such as a video packet tool, a data partitioning tool and a reversible variable length code tool.
  • the audio and video data from the baby unit 4 are transmitted in respective streams of the DECT transmission.
  • the audio and video data are not multiplexed into a single stream as in a conventional system, but are transmitted in respective time slots over the DECT air interface.
  • the devices when the video transmission system is activated, the devices will determine the available time slots on the channel. The devices will claim one or more of these time slots for their transmissions. If an insufficient number of time slots are claimed or available to support both video and audio streams (for example because other DECT devices in the surrounding area are using the required time slots), then the transmitter circuitry 16 in the baby unit 4 can switch to an audio-only mode in which it operates to only transmit the audio stream (in an available time slot) from the baby unit 4 to the parent unit 6.
  • the MPEG-4 encoder 14, MPEG-4 decoder 24 and visual display unit 26 can be deactivated.
  • the audio subsystem (comprising the microphone 10 and DECT transmission module 16) can remain activated, while the video subsystem (comprising the camera 8, encoder 14, decoder 24 and VDU 26) can be deactivated.
  • the video subsystem In normal usage, the video subsystem generates the compressed video stream and passes it to the audio subsystem (DECT module 16) for transmission to the parent unit 6.
  • the baby unit 4 instead, or in addition to, switching to an audio- only mode when there is insufficient bandwidth in the system, the baby unit 4 can switch to the audio-only mode in order to conserve power, if the baby unit 4 is running on battery power. Therefore, there is provided a simple, high-performance but low-cost video transmission system that is able to provide a secure and reliable feed from the transmitting unit to the receiving unit.
  • the video transmission systems can use existing DECT transmitter and receiver modules, so dedicated hardware in this respect is not required to implement the invention.
  • DECT transmitter and receiver modules also include the functionality required to perform the necessary coding and decoding of the audio stream, so separate circuitry for this is not required.
  • a computer program may be stored/distributed on a suitable medium, such as an optical storage medium or a solid-state medium supplied together with or as part of other hardware, but may also be distributed in other forms, such as via the Internet or other wired or wireless telecommunication systems.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Multimedia (AREA)
  • Closed-Circuit Television Systems (AREA)
  • Alarm Systems (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)

Abstract

L'invention concerne un système de communication, en particulier un système de surveillance d'un bébé, arrangé pour une utilisation, dans des applications de visioconférence et de contrôle vidéo, d'une combinaison d'une norme de communication DECT avec des techniques de compression vidéo MPEG-4.
PCT/IB2008/052623 2007-07-03 2008-06-30 Systèmes de transmission vidéo WO2009004567A2 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP07111619 2007-07-03
EP07111619.8 2007-07-03
EP08157180.4 2008-05-29
EP08157180 2008-05-29

Publications (2)

Publication Number Publication Date
WO2009004567A2 true WO2009004567A2 (fr) 2009-01-08
WO2009004567A3 WO2009004567A3 (fr) 2009-02-26

Family

ID=40050274

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2008/052623 WO2009004567A2 (fr) 2007-07-03 2008-06-30 Systèmes de transmission vidéo

Country Status (1)

Country Link
WO (1) WO2009004567A2 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101964905A (zh) * 2010-10-11 2011-02-02 北京中科大洋科技发展股份有限公司 一种利用无线通讯网络实现电视新闻直播的终端
CN102447885A (zh) * 2010-10-15 2012-05-09 中兴通讯股份有限公司 一种视频监控系统及其接入物联网的方法和系统
DE102012100665A1 (de) * 2012-01-26 2013-08-01 Gigaset Communications Gmbh Kommunikationssystem mit einer Zeitschlitzstruktur zur Übertragung von Audio- und Videodaten
CN103916625A (zh) * 2013-01-04 2014-07-09 北京兆维电子(集团)有限责任公司 一种基于云计算的视频监控系统及方法
WO2017055082A1 (fr) 2015-09-30 2017-04-06 Koninklijke Philips N.V. Sous-système de surveillance d'enfant et procédé de traitement vidéo d'un flux vidéo d'une caméra d'un système de surveillance d'enfant

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4322519A1 (de) * 1993-07-06 1995-01-12 Mark Von Seydlitz Verfahren und Anordnung zur optischen Überwachung
US5477542A (en) * 1993-03-30 1995-12-19 Hitachi, Ltd. Method and appartus for controlling multimedia information communication
DE19737355A1 (de) * 1997-08-27 1999-03-04 Siemens Ag Schnurloses Kommunikationsendgerät mit Video-Anschluß
EP0917365A2 (fr) * 1997-11-17 1999-05-19 NEC Corporation Système amélioré de transmission de données pour la vidéoconférence
WO2002062062A1 (fr) * 2001-01-30 2002-08-08 Fastcom Technology Sa Procede et dispositif servant a creer une sequence video fixe au moyen d'un appareil et transmission de cette sequence a un appareil de communication mobile dans le but de l'utiliser
WO2007118180A2 (fr) * 2006-04-05 2007-10-18 Graco Children's Products Inc. Système vidéo de surveillance pour bébé

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5477542A (en) * 1993-03-30 1995-12-19 Hitachi, Ltd. Method and appartus for controlling multimedia information communication
DE4322519A1 (de) * 1993-07-06 1995-01-12 Mark Von Seydlitz Verfahren und Anordnung zur optischen Überwachung
DE19737355A1 (de) * 1997-08-27 1999-03-04 Siemens Ag Schnurloses Kommunikationsendgerät mit Video-Anschluß
EP0917365A2 (fr) * 1997-11-17 1999-05-19 NEC Corporation Système amélioré de transmission de données pour la vidéoconférence
WO2002062062A1 (fr) * 2001-01-30 2002-08-08 Fastcom Technology Sa Procede et dispositif servant a creer une sequence video fixe au moyen d'un appareil et transmission de cette sequence a un appareil de communication mobile dans le but de l'utiliser
WO2007118180A2 (fr) * 2006-04-05 2007-10-18 Graco Children's Products Inc. Système vidéo de surveillance pour bébé

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101964905A (zh) * 2010-10-11 2011-02-02 北京中科大洋科技发展股份有限公司 一种利用无线通讯网络实现电视新闻直播的终端
CN102447885A (zh) * 2010-10-15 2012-05-09 中兴通讯股份有限公司 一种视频监控系统及其接入物联网的方法和系统
DE102012100665A1 (de) * 2012-01-26 2013-08-01 Gigaset Communications Gmbh Kommunikationssystem mit einer Zeitschlitzstruktur zur Übertragung von Audio- und Videodaten
DE102012100665B4 (de) 2012-01-26 2019-06-13 Gigaset Communications Gmbh Kommunikationssystem mit einer Zeitschlitzstruktur zur Übertragung von Audio- und Videodaten
CN103916625A (zh) * 2013-01-04 2014-07-09 北京兆维电子(集团)有限责任公司 一种基于云计算的视频监控系统及方法
WO2017055082A1 (fr) 2015-09-30 2017-04-06 Koninklijke Philips N.V. Sous-système de surveillance d'enfant et procédé de traitement vidéo d'un flux vidéo d'une caméra d'un système de surveillance d'enfant

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