EP1576824A1 - Device for the digital radio transmission of data comprising video information - Google Patents

Device for the digital radio transmission of data comprising video information

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Publication number
EP1576824A1
EP1576824A1 EP03799694A EP03799694A EP1576824A1 EP 1576824 A1 EP1576824 A1 EP 1576824A1 EP 03799694 A EP03799694 A EP 03799694A EP 03799694 A EP03799694 A EP 03799694A EP 1576824 A1 EP1576824 A1 EP 1576824A1
Authority
EP
European Patent Office
Prior art keywords
signal
stage
digital
video
transmission
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP03799694A
Other languages
German (de)
French (fr)
Inventor
Frédéric TROUVE
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Teamcast
Original Assignee
Avenir Numeric's
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 Avenir Numeric's filed Critical Avenir Numeric's
Publication of EP1576824A1 publication Critical patent/EP1576824A1/en
Withdrawn legal-status Critical Current

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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
    • H04N7/181—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast for receiving images from a plurality of remote sources

Definitions

  • the invention relates to the field of digital transmission systems.
  • It relates more particularly to transmission devices which can be connected in a network in order to be able to transmit video signals by radio.
  • the invention finds a very particular application in the realization of networks of telesurveillance cameras, in places of very varied configurations and in particular difficult to equip with traditional wired devices.
  • a home system has also been described in document US 2002/009154, making it possible to connect various electronic and computer devices to a local network of very small dimensions.
  • This type of system works with an IEEE 1394 interface which requires a very large bandwidth to transport video streams, so that it cannot in any case be transposed to a remote monitoring system by radio, including a large number of cameras.
  • a first objective of the invention is to make it possible to connect a very large number of video cameras with a central installation capable of ensuring the analysis, the saving or any other operation on all of the video information acquired by each of the cameras.
  • An objective of the invention is also to make it possible to deploy this type of installation in a very simple manner, without therefore requiring costly wire infrastructure.
  • Another objective is to allow the installation of this type of installation without limitation as to the configuration of the area to be covered.
  • the invention therefore relates to a radio-digital data transmission device including video information.
  • this device is characterized in that it comprises: has a video acquisition camera,
  • a compression stage capable of generating a digital signal from the signal from the video acquisition camera, with a compression ratio at least greater than 1: 300,
  • a shaping stage capable of inserting the compressed video signal in a frame
  • a digital modulation stage capable of generating a digital radio signal
  • a transmission / reception stage capable of transmitting the digital radio signal in a predetermined frequency band, intended for analog transmission devices and for receiving signals including frames of the same structure sent by analogous devices.
  • the invention consists in making a network connecting each of the unitary devices.
  • a data flow is thus ensured between each of the devices, which integrate the video signal from their own camera into this flow, in real time.
  • Each of the devices therefore receives all of the video signals from all the devices connected to the network, and therefore ensures their transmission with respect to the devices which are within its field of emission and reception.
  • the network of these unitary devices therefore ensuring a network which makes it possible to deploy the network over a coverage area which can be very large, without comparison with that of existing devices.
  • each of the network devices ensuring the propagation of all the video signals, it is possible to deploy this network in very uneven configuration areas, since it suffices that an isolated device is connected with another device of the network so that its video signal can be routed to the supervision installation.
  • this mesh makes it possible to ensure a certain redundancy in the event that one of the devices is faulty.
  • the video acquisition camera can generate either an analog signal or a digital signal.
  • the compression ratio is determined in relation to the bandwidth of the equivalent digitized analog signal.
  • the compression stage can be directly integrated into the video acquisition camera. However, it can be separated from the latter and form a specific electronic circuit.
  • each device can include means for remotely modifying the viewing angle of the camera, that is to say that each camera can perform zoom functions, or else can be oriented or moved to scan. an enlarged area.
  • the device forms a unitary mechanical assembly
  • these phenomena are taken into account in the characterization of the transmission and reception performances.
  • means of autonomous electrical supply for example by means of photovoltaic panels or equivalent.
  • the type of camera used can allow night surveillance, or more generally can be adapted to particular visibility conditions.
  • each device includes its compressed video signal in a frame organized in a predetermined manner, according to techniques known under the name of "transport stream".
  • the shaping stage therefore provides multiplexing allowing the data to be inserted into the general frame.
  • this frame is sent to the digital modulation stage which can operate according to different techniques, so as to generate radio frequency signals.
  • the modulations can be of the multiple access type, by distribution in broadband code, coding better known under the name of COFDM for "Coded Ortogonal Frequency Division Multiplexed".
  • WCDMA Wideband Code Division Multiple Access
  • This radio signal thus generated can be transmitted or received according to different transmission modes, and in particular in SFN mode for "Single Frequency Network", or even in MFN mode for "Multiple Frequency Network”.
  • the transmit reception stage may have either a local directive antenna, or even a distributed antenna, which can take the form of a radiating cable, for example of the coaxial type.
  • FIG. 1 is a view general of an area equipped with a device according to the invention.
  • Figure 2 is a block diagram illustrating the operation of a unitary device.
  • the invention relates to a digital radio transmission device including video information, which finds a very particular application in the field of remote monitoring.
  • transmission devices (1-4) are connected by digital radio link to each other so as to form a network. It is observed that this network can be meshed between the devices (1, 2, 3).
  • the device (4) is in turn arranged in an area in which it is only accessible to the single device (2), which however allows it to be connected to the network.
  • This network is also connected to a specific device (5) making it possible to collect information and analyze it, for example in a remote monitoring center.
  • a unitary device comprises a video acquisition camera (11).
  • This camera (11) produces a video signal, which can be embellished, for example, with an audio signal, as well as data specific to the camera, which can for example include the date and time of the shots, various identifiers, as well as the positioning and orientation parameters of the camera.
  • This camera is connected to a compression stage (15), which makes it possible to compress the various data, whether they are of the video, audio or other type,
  • This format can preferably be the format
  • the camera can integrate the compression operations into its internal electronics so that it delivers an already compressed signal.
  • This signal is then transmitted to a shaping stage (16).
  • This signal ensures the elementary framing (TSN) of the various signals produced by the camera (11) and compressed.
  • TSN elementary framing
  • Each of the elementary frames (TSN) is then integrated by multiplexing into a general frame (18).
  • the compression ratio is greater than 300, so as to limit the bandwidth used. In practice, it is preferred that this bandwidth is lower for each of the unitary devices at 500 kbit per second. 25
  • the overall frame (18) thus produced is transmitted to a modulation stage (19), making it possible to ensure channel coding.
  • Different types of coding can be used, and in particular those already mentioned and known under the abbreviations of COFDM or WCDMA, defined in particular by the ETS 300 standard.
  • This digital modulation stage (19) makes it possible to generate a signal which is then transmitted to a radio modulation stage (20), which makes it possible to generate the radio signal which will be transmitted by the antenna (21).
  • This signal is typically situated in the frequency bands of 2.4 GigaHertz or 5 GigaHertz, without however being a decisive point for the implementation of the present invention.
  • the device (10) is also capable of receiving information coming from analogous devices, by the reception stage (22) which ensures the demodulation of the radio signal received by the antenna (23).
  • the signal is then transmitted to a demodulator providing channel decoding (24).
  • This stage (24) therefore decodes the signal received to transmit the overall frame to the shaping stage (16). It is in this decoded global frame that the device (16) incorporates as already mentioned the data relating to the new acquisition by the camera (11).
  • the device according to the invention has multiple advantages, and in particular that of allowing the creation of networks of cameras and more generally systems making it possible to transmit video or derivative data, with the possibility of keeping a particularly high bit rate (typically of the order of 512 kbits / s) and sufficient for a high number of cameras (typically several tens).
  • This device is particularly suitable for carrying out remote monitoring tasks, whether in collective housing, in particular areas such as parking lots, shopping malls and other public places where security requirements are important. -s "
  • the devices can be mounted on mobile vehicles such as buses, metro, trains and other armored vans.
  • the device according to the invention can also be installed very quickly to cover public or private places within the framework of organization or event manifestation.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Closed-Circuit Television Systems (AREA)
  • Studio Devices (AREA)

Abstract

The invention relates to a device (10) for the digital radio transmission of data comprising video information. The inventive device is characterised in that it comprises: a video acquisition camera (11); a compression stage (15) which can generate a digital signal from the signal originating from the video acquisition camera (11), with a compression ratio which is at least greater than 1:300; a conforming stage (16) which can insert the compressed video signal into a frame (18); a digital modulation stage (24) which can generate a digital radio signal; a transmission/reception stage (20, 22) which can transmit the digital radio signal in a pre-determined frequency band to analogue transmission devices and which can receive signals comprising frames with the same structure transmitted by said analogue devices.

Description

DISPOSITIF DE TRANSMISSION RADIO NUMERIQUE DE DONNEESDEVICE FOR DIGITAL RADIO DATA TRANSMISSION
INCLUANT DES INFORMATIONS VIDEOINCLUDING VIDEO INFORMATION
Domaine technique L'invention se rattache au domaine des systèmes de transmission numérique.Technical field The invention relates to the field of digital transmission systems.
Elle vise plus particulièrement des dispositifs de transmission qui peuvent être connectés en réseau pour pouvoir transmettre par voie radio des signaux de type vidéo.It relates more particularly to transmission devices which can be connected in a network in order to be able to transmit video signals by radio.
L'invention trouve une application toute particulière dans la réalisation de réseaux de caméras de télésurveillance, dans des lieux de configurations très variées et notamment difficilement équipables avec des dispositifs traditionnels filaires.The invention finds a very particular application in the realization of networks of telesurveillance cameras, in places of very varied configurations and in particular difficult to equip with traditional wired devices.
Techniques antérieuresPrevious techniques
A ce jour, les solutions existantes dans le domaine de la télésurveillance vidéo sont limitées pour de multiples raisons liées aux technologies employées. Ainsi, des systèmes ont déjà été proposés dans lesquels une caméra est équipé d'un émetteur radio, émettant à destination d'un récepteur unique associé à un système de traitement vidéo. De tels systèmes sont notamment commercialisés par la Société MICROWAVE RADIO COMMUNICATION. Ce type de système est notamment employé dans le domaine du reportage télévisuel, mais il n'est pas transposable au domaine de la télésurveillance, qui nécessite que plusieurs images puissent être analysées simultanément.To date, existing solutions in the field of video surveillance are limited for many reasons related to the technologies used. Thus, systems have already been proposed in which a camera is equipped with a radio transmitter, transmitting to a single receiver associated with a video processing system. Such systems are sold in particular by the MICROWAVE RADIO COMMUNICATION Company. This type of system is used in particular in the field of television reporting, but it cannot be transposed to the field of remote monitoring, which requires that several images can be analyzed simultaneously.
D'autres solutions ont déjà été proposées dans lesquelles plusieurs caméras possèdent chacune un émetteur, et émettent leurs informations à destination d'un récepteur unique associé à la chaîne de traitement de l'information vidéo.Other solutions have already been proposed in which several cameras each have a transmitter, and transmit their information to a single receiver associated with the video information processing chain.
Ce type de solution présente l'inconvénient de nécessiter et de positionner le récepteur à un emplacement où il est à la portée de tous les émetteurs. Cela limite donc l'étendue de la couverture du système, pour un niveau de puissance d'émission donnée. En outre, des configurations complexes, avec de multiples zones encaissées ne peuvent pas être équipées avec ce type de systèmes.This type of solution has the disadvantage of requiring and positioning the receiver in a location where it is within the reach of all transmitters. This therefore limits the extent of system coverage, for a power level given program. In addition, complex configurations, with multiple concealed zones cannot be equipped with this type of system.
En outre, les technologies utilisées, et notamment les protocoles de transmission ne permettent pas la transmission d'une quantité importante d'informations vidéo, de sorte que ce type de système n'est pas adapté pour assurer la télésurveillance.In addition, the technologies used, and in particular the transmission protocols, do not allow the transmission of a large quantity of video information, so that this type of system is not suitable for ensuring remote monitoring.
On a également décrit dans le document US 2002/009154 un système domestique, permettant de relier sur un réseau local de très petites dimensions différents appareils électroniques et informatiques. Ce type de système fonctionne avec une interface IEEE 1394 qui nécessite une très large bande passante pour transporter des flux video, de sorte qu'il n'est en aucun cas transposable à un système de télésurveillance par radio, incluant un nombre de caméra important.A home system has also been described in document US 2002/009154, making it possible to connect various electronic and computer devices to a local network of very small dimensions. This type of system works with an IEEE 1394 interface which requires a very large bandwidth to transport video streams, so that it cannot in any case be transposed to a remote monitoring system by radio, including a large number of cameras.
Un premier objectif de l'invention est de permettre de relier un nombre très important de caméras vidéo avec une installation centrale susceptible d'assurer l'analyse, la sauvegarde ou toute autre opération sur l'ensemble des informations vidéo acquises par chacune des caméras.A first objective of the invention is to make it possible to connect a very large number of video cameras with a central installation capable of ensuring the analysis, the saving or any other operation on all of the video information acquired by each of the cameras.
Un objectif de l'invention est également de permettre de déployer ce type d'installation de manière très simple, sans donc nécessiter d'infrastructure fïlaire coûteuse.An objective of the invention is also to make it possible to deploy this type of installation in a very simple manner, without therefore requiring costly wire infrastructure.
Un autre objectif est de permettre la mise en place de ce type d'installation sans limitation quant à la configuration de la zone à couvrir.Another objective is to allow the installation of this type of installation without limitation as to the configuration of the area to be covered.
Exposé de l'inventionStatement of the invention
L'invention concerne donc un dispositif de transmission radio-numérique de données incluant des informations vidéo. Conformément à l'invention, ce dispositif se caractérise en ce qu'il comporte : a une caméra d'acquisition vidéo,The invention therefore relates to a radio-digital data transmission device including video information. According to the invention, this device is characterized in that it comprises: has a video acquisition camera,
" un étage de compression, apte à générer un signal numérique à partir du signal issu de la caméra d'acquisition vidéo, avec un taux de compression au moins supérieur à 1 :300,"a compression stage, capable of generating a digital signal from the signal from the video acquisition camera, with a compression ratio at least greater than 1: 300,
" un étage de conformation, apte à insérer le signal vidéo compressé dans une trame,"a shaping stage, capable of inserting the compressed video signal in a frame,
" un étage de modulation numérique, apte à générer un signal radio numérique, " un étage d'émission/réception, apte à émettre le signal radio numérique dans une bande de fréquence prédéterminée, à destination de dispositifs de transmission analogue et à recevoir des signaux incluant des trames de mêmes structures émises par des dispositifs analogues."a digital modulation stage, capable of generating a digital radio signal," a transmission / reception stage, capable of transmitting the digital radio signal in a predetermined frequency band, intended for analog transmission devices and for receiving signals including frames of the same structure sent by analogous devices.
Autrement dit, l'invention consiste à réaliser un réseau reliant chacun des dispositifs unitaires. Un flux de données est donc ainsi assuré entre chacun des dispositifs, qui intègrent à ce flux le signal vidéo de sa propre caméra, et ce en temps réel. Chacun des dispositifs reçoit donc l'ensemble des signaux vidéo de tous les dispositifs reliés au réseau, et en assure donc la transmission vis à vis des dispositifs qui sont dans son champ d'émission et réception.In other words, the invention consists in making a network connecting each of the unitary devices. A data flow is thus ensured between each of the devices, which integrate the video signal from their own camera into this flow, in real time. Each of the devices therefore receives all of the video signals from all the devices connected to the network, and therefore ensures their transmission with respect to the devices which are within its field of emission and reception.
Le réseau de ces dispositifs unitaires assurant donc un maillage qui permet de déployer le réseau sur une aire de couverture qui peut être très étendue, sans comparaison avec celle des dispositifs existants. En outre, chacun des dispositifs du réseau assurant la propagation de l'ensemble des signaux vidéo, il est possible de déployer ce réseau dans des zones de configuration très accidentées, puisqu'il suffit qu'un dispositif isolé soit relié avec un autre dispositif du réseau pour que son signal vidéo puisse être acheminé jusqu'à l'installation de supervision.The network of these unitary devices therefore ensuring a network which makes it possible to deploy the network over a coverage area which can be very large, without comparison with that of existing devices. In addition, each of the network devices ensuring the propagation of all the video signals, it is possible to deploy this network in very uneven configuration areas, since it suffices that an isolated device is connected with another device of the network so that its video signal can be routed to the supervision installation.
En pratique, cela signifie qu'une caméra peut être disposée dans une zone exiguë, dès lors qu'elle est dans la portée de réception et d'émission d'un autre dispositif situé dans une zone plus dégagée. En outre, ce maillage permet d'assurer une certaine redondance dans le cas où l'un des dispositifs serait défaillant.In practice, this means that a camera can be placed in a cramped area, as long as it is within the reception and emission range of another device located in a more open area. In addition, this mesh makes it possible to ensure a certain redundancy in the event that one of the devices is faulty.
L'intégration d'un nombre très important de signaux vidéo pour permettre d'assurer notamment des tâches de télésurveillance est permise grâce à l'emploi d'un taux de compression particulièrement élevé et supérieur à 300. Ce type de compression peut notamment être obtenue en utilisant des algorithmes de compression au format MPEG-4, avec possibilité d'adaptation du débit.The integration of a very large number of video signals to make it possible in particular to carry out remote monitoring tasks is permitted thanks to the use of a particularly high compression rate and greater than 300. This type of compression can in particular be obtained using compression algorithms in MPEG-4 format, with the possibility of bitrate adaptation.
En pratique, la caméra d'acquisition vidéo peut générer soit un signal analogique, soit un signal numérique. C'est par rapport à la bande passante du signal analogique numérisé équivalent qu'est déterminé le taux de compression.In practice, the video acquisition camera can generate either an analog signal or a digital signal. The compression ratio is determined in relation to the bandwidth of the equivalent digitized analog signal.
Dans une forme particulière de réalisation, l'étage de compression peut être directement intégré à la caméra d'acquisition vidéo. Toutefois, il peut être séparé de cette dernière et former un circuit électronique spécifique.In a particular embodiment, the compression stage can be directly integrated into the video acquisition camera. However, it can be separated from the latter and form a specific electronic circuit.
Avantageusement en pratique, chaque dispositif peut comporter des moyens pour modifier à distance l'angle de vue de la caméra, c'est-à-dire que chaque caméra peut assurer des fonctions de zoom, ou bien encore peut être orienté ou déplacé pour balayer une zone élargie.Advantageously in practice, each device can include means for remotely modifying the viewing angle of the camera, that is to say that each camera can perform zoom functions, or else can be oriented or moved to scan. an enlarged area.
Dans ce dernier cas, on peut prévoir de dissocier physiquement la caméra mobile de l'étage d'émission/réception, afin d'éviter des phénomènes d'effet Doppler pouvant perturber l'émission et la réception radio.In the latter case, provision can be made to physically dissociate the mobile camera from the transmission / reception stage, in order to avoid Doppler effect phenomena which can disturb radio transmission and reception.
Dans le cas où le dispositif forme un ensemble mécanique unitaire, ces phénomènes sont pris en compte dans la caractérisation des performances d'émission et de réception. Pour faciliter la mise en place de ces dispositifs dans des lieux difficilement accessibles, notamment en terme d'infrastructure électrique, on peut avantageusement inclure des moyens d'alimentation électrique autonome, par exemple au moyen de panneaux photovoltaïques ou équivalent. Le type de caméra utilisé peut permettre une surveillance nocturne, ou plus généralement peut être adapté à des conditions de visibilité particulières.In the case where the device forms a unitary mechanical assembly, these phenomena are taken into account in the characterization of the transmission and reception performances. To facilitate the installation of these devices in places that are difficult to access, in particular in terms of electrical infrastructure, it is advantageous to include means of autonomous electrical supply, for example by means of photovoltaic panels or equivalent. The type of camera used can allow night surveillance, or more generally can be adapted to particular visibility conditions.
En pratique, chaque dispositif inclut son signal vidéo compressé dans une trame organisée de manière prédéterminée, selon les techniques connues sous l'appellation de "transport stream". L'étage de conformation assure donc un multiplexage permettant d'insérer les données dans la trame générale.In practice, each device includes its compressed video signal in a frame organized in a predetermined manner, according to techniques known under the name of "transport stream". The shaping stage therefore provides multiplexing allowing the data to be inserted into the general frame.
Par la suite, cette trame est acheminée à l'étage de modulation numérique qui peut fonctionner selon différentes techniques, de manière à générer des signaux de radio- fréquence. Les modulations peuvent être du type par accès multiples, par répartition en code à large bande, codage plus connu sous l'appellation de COFDM pour "Coded Ortogonal Frequency Division Multiplexed".Subsequently, this frame is sent to the digital modulation stage which can operate according to different techniques, so as to generate radio frequency signals. The modulations can be of the multiple access type, by distribution in broadband code, coding better known under the name of COFDM for "Coded Ortogonal Frequency Division Multiplexed".
D'autres types de codage, et notamment le codage par accès multiples par répartition en code à larges bandes, également connu sous l'appellation WCDMA pour "Wide Band Code Division Multiple Accès" peuvent être employés.Other types of coding, and in particular coding by multiple access by distribution in wideband code, also known under the name WCDMA for "Wide Band Code Division Multiple Access" can be used.
D'autres systèmes de codage, mixant par exemple les deux types présentés peuvent également être utilisés.Other coding systems, for example mixing the two types presented, can also be used.
Ce signal radio ainsi généré peut être émis ou reçu selon différents modes d'émission, et notamment en mode SFN pour "Single Frequency Network", ou bien encore en mode MFN pour "Multiple Frequency Network".This radio signal thus generated can be transmitted or received according to different transmission modes, and in particular in SFN mode for "Single Frequency Network", or even in MFN mode for "Multiple Frequency Network".
En pratique, l'étage d'émission réception peut posséder soit une antenne locale directive, ou bien encore une antenne répartie, pouvant adopter la forme d'un câble rayonnant, par exemple du type coaxial. Description sommaire des figuresIn practice, the transmit reception stage may have either a local directive antenna, or even a distributed antenna, which can take the form of a radiating cable, for example of the coaxial type. Brief description of the figures
La manière de réaliser l'invention ainsi que les avantages qui en découlent ressortiront bien de la description du mode de réalisation qui suit, donné à titre d'exemple, et à l'appui des figures annexées dans lesquelles : La figure 1 est une vue générale d'une zone équipée d'un dispositif conforme à l'invention.The manner of carrying out the invention as well as the advantages which result therefrom will emerge clearly from the description of the embodiment which follows, given by way of example, and in support of the appended figures in which: FIG. 1 is a view general of an area equipped with a device according to the invention.
La figure 2 est un schéma bloc illustrant le fonctionnement d'un dispositif unitaire.Figure 2 is a block diagram illustrating the operation of a unitary device.
Manière de réaliser l'inventionWay of realizing the invention
Comme déjà évoqué, l'invention concerne un dispositif de transmission radio numérique incluant des informations vidéo, qui trouve une application toute particulière dans le domaine de la télésurveillance.As already mentioned, the invention relates to a digital radio transmission device including video information, which finds a very particular application in the field of remote monitoring.
Dans ce cas, et comme illustré à la figure 1, plusieurs dispositifs unitaires (1,In this case, and as illustrated in FIG. 1, several unitary devices (1,
2, 3, 4) peuvent être installés sur différents immeubles à des endroits particuliers, de manière à surveiller des zones Zl, Z2, Z3, Z4 spécifiques.2, 3, 4) can be installed on different buildings in particular places, so as to monitor specific zones Zl, Z2, Z3, Z4.
Ces dispositifs de transmission (1-4) sont reliés par liaison radio numérique entre elles de manière à former un réseau. On observe que ce réseau peut être maillé entre les dispositifs (1, 2, 3). Le dispositif (4) est quant à lui disposé dans une zone dans laquelle il n'est à la portée que du seul dispositif (2), ce qui le permet toutefois de le relier au réseau.These transmission devices (1-4) are connected by digital radio link to each other so as to form a network. It is observed that this network can be meshed between the devices (1, 2, 3). The device (4) is in turn arranged in an area in which it is only accessible to the single device (2), which however allows it to be connected to the network.
Ce réseau est également relié à un dispositif particulier (5) permettant d'assurer la collecte des informations et leur analyse, par exemple dans un centre de télésurveillance.This network is also connected to a specific device (5) making it possible to collect information and analyze it, for example in a remote monitoring center.
Bien entendu, ce centre de télésurveillance peut être relié au dispositif (5) soit directement, soit par l'intermédiaire d'une liaison informatique à haut débit, et par exemple par fibre optique. De façon schématique, et comme illustré à la figure 2, un dispositif unitaire (10) comporte une caméra d'acquisition vidéo (11). Cette caméra (11) élabore un signal vidéo, qui peut être agrémenté par exemple d'un signal audio, ainsi que de données spécifiques à la caméra, pouvant par exemple inclure la date et l'heure des 5 prises de vue, différents identifiants, ainsi que les paramètres de positionnement et d'orientation de la caméra.Of course, this remote monitoring center can be connected to the device (5) either directly or via a high speed computer link, and for example by optical fiber. Schematically, and as illustrated in FIG. 2, a unitary device (10) comprises a video acquisition camera (11). This camera (11) produces a video signal, which can be embellished, for example, with an audio signal, as well as data specific to the camera, which can for example include the date and time of the shots, various identifiers, as well as the positioning and orientation parameters of the camera.
Cette caméra est reliée à un étage de compression (15), qui permet de comprimer les différentes données, qu'elles soient de type vidéo, audio ou autres,This camera is connected to a compression stage (15), which makes it possible to compress the various data, whether they are of the video, audio or other type,
10 selon des formats prédéterminés. Ce format peut de préférence être le format10 according to predetermined formats. This format can preferably be the format
MPEG-4 ou DivX-5 pour ce qui est des données vidéo, ou bien encore le formatMPEG-4 or DivX-5 for video data, or even the format
MPEG-1 pour les signaux audio.MPEG-1 for audio signals.
La caméra peut intégrer dans son électronique interne les opérations de 15 compression de sorte qu'elle délivre un signal déjà compressé.The camera can integrate the compression operations into its internal electronics so that it delivers an already compressed signal.
Ce signal est ensuite transmis à un étage de conformation (16). Ce signal assure la mise en trame élémentaire (TSN) des différents signaux élaborés par la caméra (11) et compressés. Chacune des trames élémentaires (TSN) est ensuite 20 intégrée par multiplexage dans une trame générale (18).This signal is then transmitted to a shaping stage (16). This signal ensures the elementary framing (TSN) of the various signals produced by the camera (11) and compressed. Each of the elementary frames (TSN) is then integrated by multiplexing into a general frame (18).
Le taux de compression est supérieur à 300, de manière à limiter la bande passante utilisée. En pratique, on préfère que cette bande passante soit inférieure pour chacun des dispositifs unitaires à 500 kbit par seconde. 25The compression ratio is greater than 300, so as to limit the bandwidth used. In practice, it is preferred that this bandwidth is lower for each of the unitary devices at 500 kbit per second. 25
Par la suite, la trame globale (18) ainsi réalisée est transmise à un étage de modulation (19), permettant d'assurer le codage de canal. Différents types de codage peuvent être employés, et notamment ceux déjà évoqués et connus sous les abréviations de COFDM ou WCDMA, définis notamment par la norme ETS 300Subsequently, the overall frame (18) thus produced is transmitted to a modulation stage (19), making it possible to ensure channel coding. Different types of coding can be used, and in particular those already mentioned and known under the abbreviations of COFDM or WCDMA, defined in particular by the ETS 300 standard.
30 744. Cet étage de modulation numérique (19) permet de générer un signal qui est ensuite transmis à un étage de modulation radio (20), qui permet de générer le signal hertzien qui sera émis par l'antenne (21).30,744. This digital modulation stage (19) makes it possible to generate a signal which is then transmitted to a radio modulation stage (20), which makes it possible to generate the radio signal which will be transmitted by the antenna (21).
Ce signal se situe typiquement dans les bandes de fréquence de 2,4 GigaHertz ou de 5 GigaHertz, sans toutefois qu'il s'agisse d'un point déterminant pour la réalisation de la présente invention.This signal is typically situated in the frequency bands of 2.4 GigaHertz or 5 GigaHertz, without however being a decisive point for the implementation of the present invention.
Le dispositif (10) est également capable de recevoir les informations en provenance de dispositifs analogues, par l'étage de réception (22) qui assure la démodulation du signal radio reçu par l'antenne (23).The device (10) is also capable of receiving information coming from analogous devices, by the reception stage (22) which ensures the demodulation of the radio signal received by the antenna (23).
Le signal est ensuite transmis à un démodulateur assurant le décodage de canal (24). Cet étage (24) décode donc le signal reçu pour transmettre la trame globale à l'étage de conformation (16). C'est dans cette trame globale décodée que le dispositif (16) incorpore comme déjà évoqué les données relatives à la nouvelle acquisition par la caméra (11).The signal is then transmitted to a demodulator providing channel decoding (24). This stage (24) therefore decodes the signal received to transmit the overall frame to the shaping stage (16). It is in this decoded global frame that the device (16) incorporates as already mentioned the data relating to the new acquisition by the camera (11).
Il ressort de ce qui précède que le dispositif conforme à l'invention présente de multiples avantages, et notamment celui de permettre la réalisation de réseaux de caméras et plus généralement des systèmes permettant de faire transiter des données vidéo ou dérivées, avec la possibilité de conserver un débit particulièrement important (typiquement de l'ordre de 512 kbits/s) et suffisant pour un nombre de caméras élevés (typiquement de plusieurs dizaines).It appears from the above that the device according to the invention has multiple advantages, and in particular that of allowing the creation of networks of cameras and more generally systems making it possible to transmit video or derivative data, with the possibility of keeping a particularly high bit rate (typically of the order of 512 kbits / s) and sufficient for a high number of cameras (typically several tens).
Applications industriellesIndustrial applications
Ce dispositif est particulièrement approprié pour la réalisation de tâches de télésurveillance, que ce soit en habitat collectif, dans des zones particulières telles que des parkings de stationnement, des galeries marchandes et autres lieux publics dans lesquels les impératifs de sécurité sont importants. -s"This device is particularly suitable for carrying out remote monitoring tasks, whether in collective housing, in particular areas such as parking lots, shopping malls and other public places where security requirements are important. -s "
Dans des formes particulières, les dispositifs peuvent être montés sur des véhicules mobiles tels que des bus, métro, trains et autres fourgons blindés.In particular forms, the devices can be mounted on mobile vehicles such as buses, metro, trains and other armored vans.
Le dispositif conforme à l'invention peut également être installé très rapidement pour couvrir des lieux publics ou privés dans le cadre d'organisation ou manifestation événementielle. The device according to the invention can also be installed very quickly to cover public or private places within the framework of organization or event manifestation.

Claims

REVENDICATIONS
1/ Dispositif (10) de transmission radio numérique de données incluant des informations vidéo, caractérisé en ce qu'il comporte : " une caméra d'acquisition vidéo (11),1 / Device (10) for digital radio transmission of data including video information, characterized in that it comprises: "a video acquisition camera (11),
" un étage de compression (15), apte à générer un signal numérique à partir du signal issu de la caméra d'acquisition vidéo (11), avec un taux de compression au moins supérieur à 1 :300, " un étage de conformation (16), apte à insérer le signal vidéo compressé dans une trame ( 18),"a compression stage (15), capable of generating a digital signal from the signal from the video acquisition camera (11), with a compression ratio at least greater than 1: 300," a conformation stage ( 16), capable of inserting the compressed video signal in a frame (18),
" un étage de modulation numérique (24), apte à générer un signal radio numérique, " un étage d'émission/réception (20, 22), apte à émettre le signal radio numérique dans une bande de fréquence prédéterminée, à destination de dispositifs de transmission analogue et à recevoir des signaux incluant des trames de mêmes structures émises par des dispositifs analogues."a digital modulation stage (24), capable of generating a digital radio signal," a transmission / reception stage (20, 22), capable of transmitting the digital radio signal in a predetermined frequency band, intended for devices for analog transmission and for receiving signals including frames of the same structure transmitted by analog devices.
2/ Dispositif selon la revendication 1, caractérisé en ce que la caméra d'acquisition (4) vidéo génère un signal analogique.2 / Device according to claim 1, characterized in that the video acquisition camera (4) generates an analog signal.
3/ Dispositif selon la revendication 1, caractérisé en ce que la caméra d'acquisition vidéo (11) génère un signal numérique3 / Device according to claim 1, characterized in that the video acquisition camera (11) generates a digital signal
4/ Dispositif selon la revendication 1, caractérisé en ce que l'étage de compression (15) est intégré à la caméra d'acquisition vidéo4 / Device according to claim 1, characterized in that the compression stage (15) is integrated into the video acquisition camera
5/ Dispositif selon la revendication 1, caractérisé en ce que l'étage de compression (15) utilise des algorithmes de compression au format MPEG-4.5 / Device according to claim 1, characterized in that the compression stage (15) uses compression algorithms in MPEG-4 format.
6/ Dispositif selon la revendication 1, caractérisé en ce qu'il comporte des moyens pour modifier à distance l'angle de vue de la caméra. Il Dispositif selon la revendication 1, caractérisé en ce que l'étage de modulation numérique (19, 24) fonctionne par multiplexage par répartition orthogonale de la fréquence avec codage (COFDM).6 / Device according to claim 1, characterized in that it comprises means for remotely modifying the viewing angle of the camera. Device according to claim 1, characterized in that the digital modulation stage (19, 24) operates by multiplexing by orthogonal frequency distribution with coding (COFDM).
8/ Dispositif selon la revendication 1, caractérisé en ce que l'étage de modulation numérique (19, 24) fonctionne par accès multiples par répartition en codes à larges bandes (WCDMA).8 / Device according to claim 1, characterized in that the digital modulation stage (19, 24) operates by multiple access by distribution in wide band codes (WCDMA).
9/ Dispositif selon la revendication 1, caractérisé en ce que les étages d'émission/réception (20, 22) fonctionnent en mode de réseau à fréquence unique ou à fréquences multiples. 9 / Device according to claim 1, characterized in that the transmit / receive stages (20, 22) operate in single frequency or multiple frequency network mode.
EP03799694A 2002-12-27 2003-12-23 Device for the digital radio transmission of data comprising video information Withdrawn EP1576824A1 (en)

Applications Claiming Priority (3)

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FR0216768 2002-12-27
FR0216768A FR2849566B1 (en) 2002-12-27 2002-12-27 DIGITAL DATA RADIO TRANSMISSION DEVICE INCLUDING VIDEO INFORMATION
PCT/FR2003/003876 WO2004062290A1 (en) 2002-12-27 2003-12-23 Device for the digital radio transmission of data comprising video information

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AU (1) AU2003299400A1 (en)
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WO (1) WO2004062290A1 (en)

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AU2003299400A1 (en) 2004-07-29
FR2849566B1 (en) 2005-04-08
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US20060087552A1 (en) 2006-04-27
WO2004062290A1 (en) 2004-07-22

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