FR3025378A1 - METHOD OF PROCESSING IN A RADIO COMMUNICATION SYSTEM, RADIO FREQUENCY TERMINAL AND COMPUTER PROGRAM - Google Patents

Abstract

A method of processing in a radio communication system (1) comprising a radio communication network (2) and at least one radiofrequency mobile terminal (3) comprising an image sensor, said method comprising a video capture step of a video image a target object (4) by the image sensor of the radio frequency mobile terminal; said processing method being characterized in that it further comprises the following steps triggered by the radio frequency mobile terminal during the implementation of the video capture step, said mobile radio frequency terminal further comprising a distance sensor : i / measuring, by said distance sensor, the distance between the radiofrequency terminal and said captured target object; ii / determining the orientation and location of the mobile radio terminal; said method of processing being further characterized in that it comprises a step of: iii / determining the location of the target object as a function of the measured distance and the determined orientation and location of the mobile radio terminal .

Description

The present invention relates to a method of treatment in a radio communication system comprising a radio communication network and at least one radiofrequency mobile terminal comprising an image sensor, said radio frequency communication system comprising a radio communication network and at least one radio frequency mobile terminal comprising an image sensor, said method comprising a step of video capturing at least one image of a target object by the image sensor of the radio frequency mobile terminal. The present invention particularly relates to mobile radio systems of the private type, known as PMR, for example used by the security forces and offering radio services such as group calls, individual calls and alert calls. High-speed access to the radiocommunications network in these systems now allows radiofrequency mobile terminals with image sensors to capture photos or videos of strategic target objects such as monitored individuals, monitored areas or vehicles, and so on. , and / or store, receive and / or transmit such photos or videos. The photo or video file generally includes, in addition to the image data additional data fields indicating the date or time of the capture of the photo or video.

There is a need to increase the quality and accuracy of monitoring the monitored objects by minimizing the necessary computing and memory resources. For this purpose, according to a first aspect, the invention proposes a method of treatment in a mobile radio system of the aforementioned type characterized in that it further comprises the steps i / and ii / below triggered by the terminal mobile radio frequency during the implementation of the video capture step, said mobile radio frequency terminal further comprising a distance sensor: i / measurement, by said distance sensor, of the distance between the radio frequency terminal and said target object captured; ii / determining the orientation and location of the mobile radio terminal; said method of processing being further characterized in that it comprises a step of: iii / determining the location of the target object as a function of the measured distance and the determined orientation and location of the mobile radio terminal .

The present invention thus makes it possible to know the position of the target object captured on the image, which constitutes a major asset for the surveillance operations, and without resorting to image processing algorithms that are greedy for resources and computing time.

In embodiments, the method of processing in a radio communication system according to the invention further comprises one or more of the following features: the method further comprises a step of recording a data set relating to the captured image including the captured image and the determined location of the target object; said step of determining the location of the target object is carried out by the radio frequency mobile terminal, said radio frequency mobile terminal then transmitting, by radiofrequency, to the radiofrequency network, the set of data relating to the captured image; including the captured image and the determined location of the target object; the distance sensor of the mobile radio frequency terminal is a range finder; the radiofrequency mobile terminal comprises an orientation sensor adapted to determine the orientation of said terminal and said orientation determined in step ii is determined by said orientation sensor; and / or the radiofrequency mobile terminal comprises a GPS module adapted to obtain the GPS coordinates of said terminal and said location determined in step ii is determined by said GPS module and is a function of said GPS coordinates; the method further comprises a step of determining the size of the target object as a function of at least the measured distance and the size of the portion in the image corresponding to the target object. According to a second aspect, the present invention proposes a program to be installed in a radiofrequency mobile terminal comprising an image sensor and adapted to communicate radiofrequency with a radio communication network, said program comprising instructions for implementing the steps of FIG. a method according to the first aspect of the invention when executing the program by means of processing the radio frequency terminal. According to a third aspect, the present invention proposes a radiofrequency mobile terminal comprising an image sensor and adapted to communicate by radio frequency see with a radio communication network, said radio frequency mobile terminal being adapted to capture with the aid of the image sensor. at least one image of a target object; Said radiofrequency mobile terminal being characterized in that it further comprises a distance sensor and is adapted for, when the image sensor captures at least one image of a target object, to trigger a measurement, by said distance sensor, of the distance between the radiofrequency terminal and said target object; and determining the orientation and location of the mobile radio terminal. These features and advantages of the invention will appear on reading the description which will follow, given solely by way of example, and with reference to the appended drawings, in which: FIG. 1 represents a telecommunications system in a embodiment of the invention; Figure 2 is a schematic view of a user terminal in an embodiment of the invention; Figure 3 is a flow diagram of steps implemented in one embodiment of the invention. FIG. 1 represents a telecommunications system 1 in one embodiment of the invention. The telecommunications system 1 comprises a radio network 2 and a plurality of terminals 3a. The terminals 3a comprise, for example, mobile radio frequency user terminals and wired terminals adapted to be connected to the network 2 by wired or satellite telecommunication network, etc. In the embodiment considered, the mobile radio frequency user terminals 3a and the network 2 are adapted to communicate in accordance with the 3GPP LTE ("Long Term Evolution") standard. Hereinafter, among the terminals 3a, a mobile radio frequency user terminal 3 of the "smart phone" type (in English "smartphone"), hereinafter referred to as the mobile telephone 3, is considered.

Of course, the mobile phone 3 comprises radiofrequency transmission-reception means, a man / machine interface comprising a screen and a keyboard, a microprocessor and a memory (not shown). In one embodiment, this memory notably stores software application software instructions, which, when executed by the microprocessor 35 of the mobile telephone 3, implement in particular all or some of the steps indicated below with reference to FIG. figure 3.

The mobile phone 3 further comprises a measurement block 4, a digital camera, a processing block 6 and an image file area 7. The measurement block 4 comprises a GPS receiver 41, a digital orientation tool 42 and a telemeter 43.

These elements of the mobile phone 3 offer different functionalities implemented for example via software applications stored in the memory of the mobile phone mentioned above. The GPS receiver 41 is adapted to determine, in known manner, GPS location data of the mobile telephone 3, as a function of signals it receives from satellites of a satellite positioning system. In what follows, we consider that the location of the phone is provided in the form of a vector (Long, Lat) where Long is the longitude and Lat is the latitude, expressed in degrees, minutes, seconds. The digital orientation tool 42 comprises a compass and is adapted to determine the orientation of the mobile phone in the North, South, East, West reference system, for example by determining that of a set P of cardinal and interchannel points P1 , P2 ..., PN, for example N = 16 points, towards which the mobile phone is currently oriented. Hereinafter, the orientation of the telephone is represented by a vector normal to the front face of the screen, passing through the center of the front face, directed from the front face towards the outside of the telephone and towards the determined point of the set P. The rangefinder 43, in a known manner, is adapted to project a laser beam in a direction of sight of the range finder and to receive and process reflections of the laser beam. When an object is located on the path of the laser beam, a reflected laser beam is returned from the object toward the range finder. The telemeter 43 receives the reflected laser beam 25 and then determines the distance between the mobile phone 3 and the object, as a function of the phase difference between the transmitted and received laser beams. Area 7 of image files is a memory area suitable for storing data. The digital camera 5 is adapted to capture an image of the scene 30 delimited by a frame of view and located facing the direction of view of the camera 5, to create a data file including the image data defining the image, for example in JPEG format and having associated data, and for storing the data file created in the zone 7 of image files. The captured image is centered around the line of sight of the digital camera 5.

According to the invention, the camera 5 and the rangefinder 43 are arranged vis-a-vis each other so that the rangefinder 43 measures the distance between the mobile phone 3 and an object located at center of the frame of view of the camera. In the embodiment considered here, the sighting directions of the rangefinder 43, the digital camera 5 and the vector - are substantially merged. In embodiments, the rangefinder 43 and the digital camera 5 are arranged in the mobile phone 3 so that the range direction of the rangefinder 43 and the aiming direction of the digital camera 5 are substantially confused or substantially parallel. In one embodiment of the invention, the mobile telephone 3 is adapted to implement the set of steps indicated below with reference to FIG.

The user of the mobile phone 3 carries out a monitoring mission. The mobile phone 3 is on. The user of the mobile phone 3 identifies a target object 4 of interest, in this case this target object is an individual 4. The user of the mobile phone 3 launches the shooting function of his mobile phone, by example, by user selecting a "camera" field in a menu or on a touch screen In step 101, the mobile phone 3 detects that user's control of operating the camera 5 Following the detection of this command, the mobile phone 3 turns on the camera 5, and also puts into operation the GPS receiver 41, the orientation tool 42 and the telemeter 43 in case the latter were not already in operation (this setting up includes, for example, launching the corresponding software applications). The user aims with his mobile phone the individual 4 and when he considers the individual located in the center of the frame of sight, he controls the capture of an image by the camera 25 photo 5, for example by pressing a button or a field corresponding to the image capture. In a step 102, the mobile phone 3 detects this image capture command, and simultaneously triggers the following operations: capture of the image as currently targeted by the camera 5 and supplying a file of image data delivered by the camera 5 and defining the captured image and further comprising an associated data field indicating the date and time of the capture; determination by the GPS receiver 41 of the current position of the mobile phone 3: vector (Long, Lat); Determining by the orientation tool 42 the current orientation of the mobile phone defined by a point P of the set P; 3025378 6 - distance measurement d by the rangefinder 43; the distance measured indicates the distance between the individual 4 and the mobile phone 3. In a step 103, the mobile phone 3 collects the image data file provided, the data (Long, Lat) determined, the orientation Pi determined 5 (corresponding to the vector) and the distance measured during step 102 and calculates, based on these collected elements, the position of the individual 4. In one embodiment, the position of the individual 4 is calculated as equal to the result of a translation by a vector d. the point defined by (Long, Lat), and this position is also expressed as longitude and latitude: Longa, Lat4, taking into account the relationships between distance and longitude deviations, latitude at the location of capture considered. Then the mobile phone 3 completes the associated data field in the image data file by indicating the calculated position of the individual and stores the image data file thus completed in the area 7 of image files.

In a step 104, following a corresponding command from the user, the mobile phone 3 extracts said image data file from the image file zone 7 and transmits this image file by radio frequency via the network. 2 to a third party terminal, for example a supervisory terminal (for example by email or MMS).

In an embodiment in step 103, the mobile phone 3 determines the size of the representation of the individual 4 on the image captured in step 102 (for example by an image processing algorithm), then calculates the actual size of the individual 4 according to the distance d and the size of the determined representation.

And the mobile phone 3 completes the associated data field in the image data file by indicating the size of the calculated individual and stores the image data file thus completed in the area 7 of image files. . The invention has been described above with reference to an image corresponding to a photograph. It can of course be implemented relative to images of a video captured by the user terminal 3. It has been considered above that the location of the mobile phone 3 was determined using a GPS receiver included in the mobile phone, in the form of 35 longitude / latitude.

In other embodiments, the location is determined by other locating means, for example by the network using a triangulation and so on. In embodiments, the location data is expressed using data other than longitude / latitude, for example by coordinates in a three-dimensional coordinate system defined by its center O, chosen near the Earth's center of gravity. and three orthonormal unit vectors Ox, Oy and Oz, Ox and Oy lying in the Earth's equatorial plane, and Oz being oriented along the axis of Earth's rotation. The steps 101 to 104 have been described above as implemented by the mobile phone 3.

In other embodiments of the invention, at least some of these steps are implemented in a distributed manner between the mobile telephone 3 and at least one other equipment in the telecommunications system 1, for example a supervisory terminal. For example, in one embodiment, the mobile phone 3, at the end of step 102, transmits to this other equipment the captured image file and the associated data including the capture date, the location data. (Long, Lat) and the orientation of the telephone as well as the distance as determined in step 102. And the supervisor terminal performs step 103 of calculating the position of the target object according to these associated data, and if necessary then inserts this position into the image file. In other embodiments, the orientation of the mobile phone is determined using a tool other than a digital tool including a compass, for example using software application calculating the orientation of the phone according to the detection of movements of the phone using accelerometers and / or gyroscopes 25 etc. In other embodiments, the distance between the mobile phone and the target object is estimated using tools other than a rangefinder, for example using equipment adapted to deduce the distance. according to any type of transmitted signals, and reflected from these transmitted signals (radar type) etc.

Claims (14)

REVENDICATIONS1. A method of processing in a radio communication system (1) comprising a radio communication network (2) and at least one radiofrequency mobile terminal (3) comprising an image sensor (5), said method comprising a video capture step of at least one image of a target object (4) by the image sensor of the radio frequency mobile terminal; said method of processing being characterized in that it further comprises the steps i / and ii / below triggered by the radio frequency mobile terminal during the implementation of the video capture step, said mobile radio frequency terminal comprising in in addition to a distance sensor: i / measuring, by said distance sensor, the distance between the radiofrequency terminal and said captured target object; ii / determining the orientation and location of the mobile radio terminal; said method of processing being further characterized in that it comprises a step of: iii / determining the location of the target object as a function of the measured distance and the determined orientation and location of the mobile radio terminal . 2. Processing method according to claim 1, further comprising a step of recording a set of data relating to the captured image comprising the captured image and the determined location of the target object (4). 3. Treatment method according to claim 1 or 2, wherein said step of determining the location of the target object (4) is implemented by the radio frequency mobile terminal (3), said mobile terminal radiofrequency then transmitting, radiofrequency, to the radio frequency network (2), the set of data relating to the captured image comprising the captured image and the determined location of the target object. 4. Treatment method according to any one of the preceding claims, wherein the sensor (43) distance of the mobile radio frequency terminal (3) is a rangefinder. 5. Treatment method according to any one of the preceding claims, wherein: the radiofrequency mobile terminal (3) comprises an orientation sensor (42) adapted to determine the orientation of said terminal and said orientation determined in step ii / is determined by said orientation sensor; and / or the radiofrequency mobile terminal (3) comprises a GPS module (41) adapted to obtain the GPS coordinates of said terminal and said location determined in step ii / is determined by said GPS module and is a function of said GPS coordinates. The treatment method according to any one of the preceding claims, further comprising a step of determining the size of the target object (4) as a function of at least the measured distance and the size of the portion, in the image, corresponding to the target object. 7. A computer program to be installed in a radio frequency mobile terminal comprising an image sensor (5) and adapted to communicate radiofrequency with a radio communication network (2), said program comprising instructions for implementing the steps of a method according to one of claims 1 to 6 during a program execution by processing means of the radiofrequency terminal. 8.- mobile radio frequency terminal (3) comprising an image sensor (5) and adapted to communicate by radiofrequency see with a network (2) of radiocommunications, said mobile radio terminal being adapted to capture with the aid of the sensor images of at least one image of a target object; said radiofrequency mobile terminal being characterized in that it further comprises a distance sensor (43) and is adapted for, during a capture by the image sensor of at least one image of a target object, triggering: a measurement, by said distance sensor (43), of the distance between the radiofrequency terminal and said target object; and determining the orientation and location of the mobile radio terminal. 9. A mobile radio terminal (3) according to claim 8, further adapted to determine the location of the target object as a function of the measured distance and the determined orientation and location of the mobile radio terminal. 10. A mobile radio terminal (3) according to claim 9, comprising a memory and adapted to record in said memory a set of data relating to the captured image comprising the captured image and the determined location of the object. target (4). 11. A mobile radio terminal (3) according to one of claims 9 to 10, adapted 5 for transmitting, radiofrequency, to the network (2) radiofrequency, the captured target object image and: - the location of the target object determined as a function of the measured distance and furthermore of the determined orientation and location of the mobile radio terminal; and / or - the measured distance and furthermore the determined orientation and location. 10 12. Mobile radio terminal (3) according to any one of claims 8 to 11, wherein the sensor (43) distance of the mobile radio frequency terminal (3) is a rangefinder. 15 13. A mobile radio terminal (3) according to any one of claims 8 to 12, wherein: - the mobile radio terminal (3) comprises an orientation sensor (42) adapted to determine said orientation of said terminal; and / or the radiofrequency mobile terminal (3) comprises a GPS module (41) adapted to obtain the GPS coordinates of said terminal and said location is a function of said GPS coordinates. 14. A mobile radio terminal (3) according to any one of the preceding claims, adapted to determine the size of the target object (4) as a function of at least the measured distance and the size of the portion, in the image, corresponding to the target object.