JP2017163379A - Wireless communication terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wireless communication terminal capable of life-saving for operators, reducing a tackling time, and preventing a second disaster from occurring.SOLUTION: A mobile wireless apparatus 2 comprises: a status change detection section 416a to detect a specific status change, that is, an operator falling over, a detonating sound, and abnormal high-temperature; an image transmission control section 416b to transmit an image data around the operator obtained by a camera 403, in a time range from a detected point of the specific status change to a predetermined time, to a management center with an abnormality notification information. Moreover, even if the operator is in a state of falling over and disabling to move, the image data around the operator is automatically transmitted to the management center after passing predetermined timing since the status change detection section 416a detecting the falling over.SELECTED DRAWING: Figure 1

Description

  The present invention uses a camera-equipped portable wireless communication terminal, and supports quick support and rescue by controlling the wireless communication terminal from the management center and transmitting information from the holder of the wireless communication terminal to the management center. The present invention relates to a camera-equipped portable wireless communication terminal.

  In recent years, for example, there are business-use portable wireless devices used in field work (see, for example, Patent Document 1). In such a portable wireless device, diversification of functions is required in accordance with work conditions. As a function, for example, there is an operator's fall detection function.

  By the way, when an operator wears a portable radio with a fall detection function and falls down due to an accident during work, the fall detection function of the portable radio can make a report to the management center. It was difficult to grasp the situation as to whether the patient was in poor health or had fallen due to an external factor.

  Workers such as firefighters, police officers, security guards, etc. have no means to store images in a portable wireless device with an external microphone with a camera and notify the management center automatically or manually of the situation immediately before the accident. It was.

  On the other hand, for management centers, portable radios owned by workers are used to check whether workers such as firefighters, police officers, and guards are performing normal activities or have encountered an abnormal situation. For example, when a firefighter enters a building for fire fighting or lifesaving, the person loses consciousness due to smoke suction, or the worker falls into an emergency situation. In some cases, it was impossible to respond, and it was difficult for the management center to grasp the state of the worker or the surrounding situation.

Japanese Patent Laying-Open No. 2015-194960

  The prior art only transmits a fall notification and surrounding voice to the management center when a fall is detected, and means for grasping the surrounding situation of the worker from the management center is limited to estimation from the voice around the worker. For this reason, it was difficult for the management center to deal with an appropriate rescue procedure because the level of operator fall and the urgency were unknown.

  When rushing into a building for fire fighting or lifesaving by firefighters etc., it is often exposed to danger because it is impossible to predict that the destination will be abnormally hot or exploding due to a backdraft etc. It has become a challenge.

  When an emergency inquiry is made to the worker from the management center and the worker cannot respond due to an accident or malfunction at that time, the management center cannot grasp the surrounding situation of the worker, and it takes time to respond, and the relief is delayed was there.

  An object of the present invention is to provide a wireless communication terminal capable of saving a worker's life and reducing response time and capable of preventing a secondary disaster.

  In order to achieve the above object, according to a first aspect of the present invention, there is provided a radio unit connected to a management center via a communication network and capable of communicating with the management center via the communication network, and a camera unit. A state change detection unit that detects a specific state change, a storage unit that stores video data within an imaging field obtained by the camera unit, and the state change detection unit The video data obtained by the camera unit from a time point when a specific state transition is detected to a predetermined time is stored in the storage unit, the video data stored in the storage unit is read, and the wireless unit And a control unit for executing transmission of the video data.

  According to the first aspect, when a specific state change, that is, a worker's fall, explosion noise, or abnormally high temperature is detected, the video data around the worker from the detection time to a predetermined time is managed. It will be sent to the center along with information indicating the status change. For this reason, even in places where it is difficult to install surveillance cameras, etc., or in places where surveillance cameras are blind spots, the management center will instantly grasp the situation, determine appropriate responses, and send them to the adjacent firefighters on site. Requests for support can be made quickly. In addition, when an abnormally high temperature is detected, it is possible to warn and support peripheral workers.

  According to a second aspect of the present invention, in the first aspect, the control unit is predetermined from an operation of a transmission key included in the wireless communication terminal or a time point when a state transition is detected by the state transition detection unit. After the elapse of time or based on reception of a transmission request from the management center, the wireless unit is caused to execute transmission of the video data.

  According to the second aspect, if the transmission key can be operated even if the worker falls down, the video data around the worker is immediately transmitted to the management center. Even if the worker falls and cannot move, the video data around the worker is automatically transmitted to the management center after a predetermined time has elapsed since the time when the fall was detected. Furthermore, if the management center makes an urgent inquiry to the worker and the worker cannot respond due to an accident or poor physical condition at that time, the wireless communication terminal is controlled from the management center and the video data around the worker is obtained from the camera unit. Therefore, it is possible to determine the reason for not being able to respond and to promptly respond.

  According to a third aspect of the present invention, in the first and second aspects, a wireless device main body including the wireless unit, the state transition detection unit, the storage unit, and the control unit, and at least the camera The wireless device main body and the handset are connected by wired or short-range wireless communication.

  According to the third aspect, by providing the camera unit in a handset separate from the radio device main body, for example, even if the site is a place where the radio device main body becomes a blind spot, work is performed by the camera unit provided in the handset. The site can be imaged.

  According to a fourth aspect of the present invention, in the first and second aspects, the control unit changes the number of pixels with respect to the video data stored in the storage unit or stores the storage according to a remaining battery level. Generating a data to be transmitted to the communication network as a still image divided from the moving image with respect to the video data stored in the unit.

  According to the fourth aspect, when the battery has a low voltage regardless of the video storage setting of the wireless communication terminal, the data size is changed and transmitted by reducing the resolution of the video data or changing the video to a still image. As a result, the management center can reliably grasp the situation and determine an appropriate response.

  As described above, according to the present invention, since the management center controls the portable wireless communication terminal with a camera, there are effects such as lifesaving of workers and reduction of response time.

  When a firefighter enters a dangerous situation, the MPU of a portable wireless communication terminal with a thermo camera detects a high temperature abnormality and reports it to the management center. Because it is possible to give a warning of danger, it is effective in preventing secondary disasters.

The functional block diagram which shows the structure of the portable radio | wireless machine concerning one Embodiment of the radio | wireless communication terminal of this invention. 1 is a configuration diagram of a business wireless system according to a first embodiment. 5 is a flowchart illustrating a control processing procedure between the portable wireless device and the management center according to the first embodiment. FIG. 3 is a configuration diagram of a business wireless system according to a second embodiment. 9 is a flowchart illustrating a control processing procedure between the portable wireless device and the management center according to the second embodiment. FIG. 6 is a configuration diagram of a business use wireless system according to a third embodiment. 10 is a flowchart illustrating a control processing procedure between the portable wireless device and the management center according to the third embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

The portable wireless communication terminal with a camera in the present invention is one having a camera directly in the wireless device body or an external microphone with a camera in the wireless device body.
FIG. 1 is a functional block diagram showing a configuration of a portable wireless device according to an embodiment of a wireless communication terminal of the present invention.

  The portable wireless device 2 includes an external interface 400, a thermo camera 401, a thermo sensor 402, a camera 403, a microphone 404, a speaker 405, a microphone 406, a speaker 407, an audio codec 408, and an image processing unit 409. A DSP 410 as a radio unit, a radio circuit unit 411 as a radio unit, an antenna 412, a triaxial acceleration sensor 413, an LCD 414, an operation unit 415, an MPU 416, a memory 417, a battery 418, and a power source A circuit 419.

  Among these, the external interface 400, the thermo camera 401, the thermo sensor 402, the camera 403, the microphone 404, and the speaker 405 are provided in the handset 3. Here, the case where the external interface 400, the thermo camera 401, the thermo sensor 402, the camera 403, the microphone 404, and the speaker 405 are provided in the handset 3 is described, but the thermo camera 401, the thermo sensor 402, and the camera are described. 403 may be provided not in the handset 3 but in the main body of the portable wireless device 2 without using the external interface 400.

  A radio frequency signal arriving from a base station (not shown) via a radio channel is received by the antenna 412 and then input to the radio circuit unit 411. The radio circuit unit 411 performs channel coding (modulation / demodulation) processing, bit synchronization / frame synchronization, error detection, and the like on the radio frequency signal.

  The output signal of the wireless circuit unit 411 is supplied to a DSP (Digital Signal Processor) 410 where it is separated into audio data, video data, and control information. Then, the audio data is supplied to the audio codec 408, where it is decoded, and the reproduced audio signal is output from the speaker 407 or output from the speaker 405 of the handset 3 via the external interface 400. . On the other hand, the video data is subjected to video decoding processing by the image processing unit 409, and the video signal reproduced thereby is supplied to the LCD 414 via the MPU 416 and displayed. The control information is supplied to the MPU 416.

  On the LCD 414, various information indicating the operation state of the portable wireless device 2 output from the MPU 416, such as the remaining amount of the battery 418, is also displayed.

  On the other hand, the worker's transmission voice signal output from the microphone 406 or the worker's transmission voice signal output from the microphone 404 of the handset 3 is input to the audio codec 408, where it is voice-encoded. Input to the DSP 410. In addition, video signals output from the thermocamera 401 and the camera 403 of the handset 3 are input to the image processing unit 409 of the DSP 410 via the external interface 400 and the MPU 416, where video encoding processing is performed.

  In the DSP 410, the audio encoded audio data and the video data are multiplexed in a predetermined format, and the multiplexed transmission data is input to the radio circuit unit 411. The radio circuit unit 411 performs frequency conversion processing, power amplification processing, and the like on the transmission data to generate a radio frequency signal. This radio frequency signal is transmitted from the antenna 412 to a base station (not shown).

  The thermo sensor 402 detects an external temperature. The three-axis acceleration sensor 413 detects an external three-dimensional acceleration change of the portable wireless device 2. The operation unit 415 is provided with a key group such as a dial key, a call key, a power key, an end key, a volume adjustment key, and a mode designation key.

  Note that the power supply circuit 419 generates a predetermined operating power supply voltage based on the output of the battery 418 and supplies it to each unit.

  The MPU 416 includes a microcomputer as a main control unit, for example, and includes a state transition detection unit 416a and an image transmission control unit 416b as control functions according to the present invention.

  The state transition detection unit 416a detects the fall of the worker as a specific state transition based on the information on the acceleration change by the three-axis acceleration sensor 413, and detects an abnormal state based on the temperature detection information by the thermosensor 402. Detect high temperature. In addition, the state transition detection unit 416a detects an on-site explosion sound based on the sound volume input to the microphones 404 and 406. Furthermore, the state transition detection unit 416a may determine that the state transition is a specific state transition when there is no response operation even after a predetermined time has passed in response to an emergency inquiry from the management center.

  The image transmission control unit 416b sets the video data in the imaging field captured by the thermo camera 401 or the camera 403 in advance from the time of detection when a specific state transition is detected by the state transition detection unit 416a. The data is stored in the memory 417 until the time (for example, 30 seconds). Then, when the transmission key of the operation unit 415 is pressed, after a preset time (for example, 1 minute) has elapsed from the detection time point, or based on reception of a transmission request from the management center, the data is stored in the memory 417. The input video data is input to the DSP 410 and transmitted to the management center via the wireless circuit unit 411.

  Also, the image transmission control unit 416b inputs the video data stored in the memory 417 to the DSP 410 according to the remaining amount of the battery 418, and changes the number of pixels by the image processing unit 409 or divides the video data from the moving image. A process for generating data to be transmitted to the management center as a still image is executed.

  The portable wireless device 2 and the handset 3 are connected by wire, but may be connected by a short-range wireless communication function such as Bluetooth (registered trademark).

Next, a method of using the portable wireless device 2 configured as described above at a work site will be described.
(Preparation before work)
For example, before the start of work by firefighters, police officers, security guards, etc., video save settings on the portable wireless device 2 (resolution, save time interval for still images, save time for always overwriting for movies, save Automatic setting according to the destination memory capacity, etc.), the handset 3 is attached to the chest and the like, and video storage is started.

  In the case of the thermo camera 401, the handset 3 is attached to the chest or the like, and image storage and temperature monitoring using the thermo camera 401 are started.

(Operation during work)
When the MPU 416 determines that the MPU 416 has fallen from data from the triaxial acceleration sensor 413 due to poor physical condition or accident during the work, an abnormality detection notification and video information are transmitted to the management center.

  When a loud sound such as an explosive sound during work is collected by the microphone 404 and the MPU 416 determines that there is an abnormality, an abnormality detection notification and video information are similarly transmitted to the management center.

  On the other hand, when a high temperature abnormal state is judged by the MPU 416 from the data from the thermo camera 401 for fire fighting or lifesaving, the operator who is the owner of the portable wireless device 2 is warned with an alert sound or the like, and further the management center Anomaly detection notification and video information are transmitted.

  Further, the management center makes an urgent call to the worker, and if there is a response from the worker, the normal operation is performed. If there is no response, the worker's portable radio device 2 is remotely controlled from the management center. In order to obtain the peripheral information of the video, a command or the like is sent to send video information. The MPU 416 of the portable wireless device 2 that has received it determines a command or the like, and transmits video information to the management center.

  If the battery 418 is at a low voltage (for example, the remaining battery level is 20%) regardless of the video storage setting of the portable wireless device 2, the number of pixels of the video data is changed to lower the resolution or change the video to a still image. The data size can be changed and transmitted.

(Response at the management center)
Analyzes the abnormality notification and video information received at the management center, determines whether it is necessary to remotely control the camera 403 connected to the portable wireless device 2 of the worker, and if necessary, looks around the worker See and respond accordingly.
After the end, the video storage is ended by the operation of the management center or the operator.

  Hereinafter, specific examples of the business wireless system in which the portable wireless device 2 is used will be described according to each embodiment.

(Example 1: 3-axis acceleration sensor)
In the first embodiment, a case where the triaxial acceleration sensor 413 is used will be described. FIG. 2 is a configuration diagram of the business wireless system according to the first embodiment.

  The commercial wireless system is composed of a portable wireless device 2 and a management center 1A. The management center 1A is connected to the portable wireless device 2 of the worker 4A at the work site via a communication network NW1 such as a LAN (Local Area Network) or the Internet (such as an optical line or CATV). A fall notification and video information captured by the camera 403 are received. The video information falls according to the save setting (resolution, save time interval for still images, save time for always overwriting for movies, automatic setting according to the memory capacity of the save destination, etc.) Sometimes it is transferred to the management center 1A via the portable wireless device 2 together with a fall notification. In this case, it is assumed that the portable wireless device 2 is located within a wireless area formed by a plurality of base stations (not shown) connected to the communication network NW1. The portable wireless device 2 is connected to the base station via a wireless line within a wireless area formed by the base station.

  As a result, the management center 1A immediately grasps the situation even in places where it is difficult to install surveillance cameras or blind spots of surveillance cameras, judges appropriate responses, requests for support from the firefighters adjacent to the site, etc. Can be done quickly. Also, not only when a fall is detected, but also a loud sound such as an explosion sound at the work site is detected by the microphone 404 of the handset 3, and triggered by this, an abnormality notification around the worker 4A and video information are transmitted to the management center 1A. Also possible. As the type of the camera 403, a wide-angle lens with a wide viewing angle, an infrared camera for night vision, and the like can be considered. In the case of a movable camera, it is possible to acquire a live image by controlling the angle and zoom of the camera 403 by real-time control from the management center 1A to the portable wireless device 2 of the worker.

  In addition, when the battery 418 is at a low voltage regardless of the video storage setting of the portable wireless device 2, it is also possible to change the data size and transmit by reducing the resolution of the video data or changing the video to a still image. Become.

  FIG. 3 is a flowchart showing a control processing procedure between the portable wireless device 2 and the management center 1A.

  When the operator 4A operates the operation unit 415 of the portable wireless device 2 to set a video storage method (step ST101), the portable wireless device 2 starts video storage (step ST102).

  Then, when the operator 4A operates the operation unit 415 of the portable wireless device 2 at the end of the work and performs a video storage end operation (step ST103: Yes), the portable wireless device 2 ends the video storage process (step ST111). .

  On the other hand, the portable wireless device 2 monitors information on acceleration change output from the three-axis acceleration sensor 413 during the work of the worker 4A (step ST104). For example, each of the x-axis direction and the z-axis direction in FIG. When it is determined that the operator 4A has fallen due to the waveform shape, size, number of times, and time interval (Yes), the video data in the imaging field captured by the camera 403 is set in advance from the time of detection. The data is stored in the memory 417 until (for example, 30 seconds), and the abnormality detection notification and the video data stored in the memory 417 are transmitted to the management center 1A after elapse of a preset time (for example, 1 minute) from the detection time (step ST106). In this case, when the magnitudes of the waveforms in the x-axis direction and the z-axis direction are aa (aa is an integer) or more, the portable wireless device 2 determines that the worker 4A has fallen.

  In addition, even when the portable wireless device 2 does not determine that the worker 4A falls from the information on the acceleration change output from the triaxial acceleration sensor 413 during the work of the worker 4A (No), the portable wireless device 2 monitors the volume of the microphone 404 of the handset 3. (Step ST105), and when a loud volume exceeding bb (bb is an integer) is detected (Yes), the image data in the imaging field captured by the camera 403 is determined as an explosion sound generated in the field. From the detection time point, a preset time (for example, 30 seconds) is stored in the memory 417, and after the preset time (for example, one minute) has elapsed from the detection time point, the abnormality detection notification to the management center 1A and the video stored in the memory 417 are stored. Send data. If the worker 4A can move, the abnormality detection notification and the video data stored in the memory 417 can be immediately transmitted to the management center 1A by pressing the transmission key of the operation unit 415.

  When the management center 1A analyzes the video data sent from the portable wireless device 2 (step ST107) and determines that remote control is necessary (step ST108: Yes), the angle, zoom, Sensitivity adjustment and the like are remotely controlled (step ST109). And management center 1A respond | corresponds suitably, such as support of a surrounding worker (step ST110). Thereafter, the video storage is ended (step ST111). Even if it is determined that the remote control is not necessary in the management center 1A (step ST108: No), the management center 1A takes appropriate measures such as supporting peripheral workers.

(Example 2: Thermo sensor)
In the second embodiment, a case where the thermosensor 402 is used will be described. FIG. 4 is a configuration diagram of the business wireless system according to the second embodiment. In FIG. 4, the same parts as those in FIG.

  The commercial wireless system is composed of a portable wireless device 2 and a management center 1B. For example, before the worker 4B such as a firefighter enters the scene 5 without knowing that the temperature is high due to fire extinguishing activities or lifesaving, the camera 403 is automatically switched from the camera 403 to the thermo camera 401 at a certain temperature or more by sensing of the thermo sensor 402, The information obtained by the thermo camera 401 is judged by the MPU 416 of the portable wireless device 2, the worker 4B is warned by an alert tone or the like, and the high temperature abnormality information notification and the video information obtained by the camera 403 are further notified to the management center 1B. It transmits via communication network NW1. As a result, the management center 1B side can determine an appropriate response, and can warn and support peripheral workers.

  FIG. 5 is a flowchart showing a control processing procedure between the portable wireless device 2 and the management center 1B.

  When the operator 4B operates the operation unit 415 of the portable wireless device 2 to set a video storage method (step ST201), the portable wireless device 2 starts video storage and temperature monitoring by the thermo camera 401 (step ST202).

  Then, when the worker 4B operates the operation unit 415 of the portable wireless device 2 at the end of the work and performs a video storage end operation (step ST211: Yes), the portable wireless device 2 ends the video storage process (step ST209). .

  On the other hand, the portable wireless device 2 monitors temperature change information output from the thermo camera 401 during the work of the worker 4B (step ST203), and detects a temperature exceeding, for example, cc (cc is an integer) ° C. In this case (Yes), it is determined that the temperature is abnormally high, and the video data in the imaging field captured by the thermo camera 401 is stored in the memory 417 from the detection time until a preset time (for example, 30 seconds). After elapse of a preset time (for example, 1 minute), the abnormality detection notification and the video data stored in the memory 417 are transmitted to the management center 1B (step ST204).

  When the management center 1B analyzes the video data sent from the portable wireless device 2 (step ST205) and determines that remote control is necessary (step ST206: Yes), the angle, zoom, Sensitivity adjustment and the like are remotely controlled (step ST207). And management center 1B respond | corresponds suitably, such as a support of a surrounding worker (step ST208). Thereafter, the video storage is terminated (step ST209). Even if it is determined that the remote control is not necessary in the management center 1B (step ST206: No), the management center 1B appropriately responds such as support of surrounding workers.

(Example 3: Inquiries from the management center)
In the third embodiment, a case where an inquiry from the management center 1C is used will be described. FIG. 6 shows a configuration diagram of the business wireless system of the third embodiment. In FIG. 6, the same parts as those in FIG.

  When the management center 1C makes an urgent inquiry to the worker 4C and the worker 4C cannot respond due to an accident or poor physical condition at that time, save settings (resolution, save time interval for still images, and always record for movies) The portable wireless device 2 of the worker 4C is controlled from the management center 1C according to the storage time of the overwrite, the automatic setting according to the storage destination memory capacity, etc., and the worker 4C peripheral information from the camera 403 of the handset 3 connected thereto. The reason why the video cannot be answered by acquiring the video is quickly determined.

  As the type of the camera 403, a wide-angle lens with a wide viewing angle, an infrared camera for night vision, and the like can be considered. In the case of a movable camera, the live image can be acquired by controlling the angle and zoom of the camera 403 by real-time control from the management center 1C to the portable wireless device 2 of the worker 4C.

  FIG. 7 is a flowchart showing a control processing procedure between the portable wireless device 2 and the management center 1C.

  When the operator 4C operates the operation unit 415 of the portable wireless device 2 to set a video storage method (step ST301), the portable wireless device 2 starts video storage (step ST302).

  Then, when the operator 4C operates the operation unit 415 of the portable wireless device 2 at the end of the work and performs a video storage end operation (step ST303: Yes), the portable wireless device 2 ends the video storage process (step ST311). .

  The management center 1C makes an emergency inquiry to the portable wireless device 2 of the worker 4C as necessary. When the portable wireless device 2 receives an incoming call for an emergency inquiry from the management center 1C (step ST304: Yes), the portable wireless device 2 notifies the worker 4C of the incoming call and determines whether there is a response operation of the worker 4C. Monitor (step ST305). When the worker 4C responds to the incoming call notification (No), the portable wireless device 2 establishes a communication link via the communication network NW1 with the management center 1C, and thereafter calls are possible.

  On the other hand, if there is no response from the worker 4C even after a certain time (for example, 1 minute) has elapsed (Yes), the management center 1C remotely controls the portable wireless device 2 to transmit video information (step ST306). At this time, the portable wireless device 2 determines that the accident of the worker 4C or the poor physical condition of the worker 4C is a specific state transition, and determines that the video data obtained by the camera 403 is an accident or poor physical condition of the worker 4C. You may make it memorize | store in the memory 417 from the time to preset time (for example, 30 seconds).

  When the management center 1C analyzes the video data sent from the portable wireless device 2 (step ST307) and determines that remote control is necessary (step ST308: Yes), the angle, zoom, Sensitivity adjustment and the like are remotely controlled (step ST309). And management center 1C respond | corresponds suitably, such as a support of a surrounding worker (step ST310). Thereafter, the video storage is terminated (step ST311).

(Operational effects of this embodiment)
As described above, according to the present embodiment, in the portable wireless device 2, when the state transition detection unit 416a detects a specific state transition, that is, an operator's fall, explosion sound, or abnormally high temperature, from this detection time point. Video data around the worker up to a predetermined time is transmitted to the management centers 1A, 1B, and 1C together with the abnormality notification information. For this reason, the management centers 1A, 1B, and 1C instantly grasp the situation, determine appropriate responses, even in places where it is difficult to install surveillance cameras, etc., or places that are blind spots of surveillance cameras. Requests for support from the adjacent firefighters can be made quickly. In addition, when an abnormally high temperature is detected, it is possible to warn and support peripheral workers.

  Further, according to the present embodiment, in the portable wireless device 2, even if the worker 4A falls down and cannot move, the surrounding area of the worker is automatically obtained after a predetermined time has elapsed since the time when the fall was detected. Are transmitted to the management center 1A. Furthermore, when the management center 1C makes an urgent inquiry to the worker and the worker cannot respond due to an accident or poor physical condition at that time, the portable wireless device 2 is controlled from the management center 1C, and the surroundings of the worker 4C from the camera 403 are controlled. It is possible to determine the reason why the video data is acquired and cannot respond, and to respond quickly.

  Further, according to the present embodiment, by providing the thermo camera 401 and the camera 403 in the handset 3 that is separate from the portable wireless device 2, the worker 4A holds the portable wireless device 2 on the waist, for example, in the field. Therefore, even if it becomes a blind spot, the work site can be imaged by the thermo camera 401 and the camera 403 of the handset 3 attached to the chest of the worker 4A.

  Furthermore, according to the present embodiment, when the battery 418 has a low voltage regardless of the video storage setting of the portable wireless device 2, the data size is changed by reducing the resolution of the video data or changing the video to a still image. Thus, the management center 1A, 1B, 1C can transmit to the management center 1A, 1B, 1C, so that the management center 1A, 1B, 1C can reliably grasp the situation and determine an appropriate response.

(Other embodiments)
In addition, the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

  1A, 1B, 1C ... management center, 2 ... portable radio, 3 ... handset, 5 ... site, 400 ... external interface, 401 ... thermo camera, 402 ... thermo sensor, 403 ... camera, 404 ... microphone, 405 ... speaker, 406 ... Microphone, 407 ... Speaker, 408 ... Audio codec, 409 ... Image processing unit, 411 ... Radio circuit unit, 412 ... Antenna, 413 ... Triaxial acceleration sensor, 415 ... Operating unit, 416a ... State transition detection unit, 416b ... Image transmission control unit, 417, memory, 418, battery, 419, power supply circuit, NW1, communication network.

Claims (4)

A portable wireless communication terminal connected to a management center via a communication network and having a wireless unit capable of communicating with the management center via the communication network, and a camera unit,
A state transition detection unit for detecting a specific state transition;
A storage unit for storing video data within an imaging field obtained by the camera unit;
Video data obtained by the camera unit from a time point when a specific state transition is detected by the state transition detection unit to a predetermined time is stored in the storage unit, and the video data stored in the storage unit is stored in the storage unit. A wireless communication terminal comprising: a control unit that reads and executes transmission of the video data by the wireless unit; and video data.   The control unit is configured to operate a transmission key provided in the wireless communication terminal, or after a predetermined time elapses from the time when the state change is detected by the state change detection unit, or based on reception of a transmission request from the management center. The wireless communication terminal according to claim 1, wherein the wireless unit transmits the video data. A radio main body having the radio unit, the state transition detection unit, the storage unit, and the control unit;
A handset having at least the camera unit;
The wireless communication terminal according to claim 1, wherein the wireless device main body and the handset are connected by wired or short-range wireless communication.   The control unit is configured to change the number of pixels for the video data stored in the storage unit according to a remaining battery level, or as a still image obtained by dividing the video data stored in the storage unit from a moving image. The wireless communication terminal according to any one of claims 1 to 3, wherein a process for generating data to be transmitted to the mobile station is executed.