JP2007089017A - Communication terminal, data transmission method, data reception method, data transmission program, data reception program and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively utilize image data which can be obtained by each terminal. <P>SOLUTION: A first communication apparatus 110 and a second communication apparatus 120 are communication terminals in a communication network which is composed of several communication terminals communicative with one another. The first communication apparatus 110 is composed of a delivery part 111, a reception part 112, an acquisition part 113, a transmission part 114 and a decision part 115. The delivery part 111 delivers spot information on the actual position of the first communication terminal 110 to the second communication terminal 120. The reception part 112 receives a request signal for transmission of image data concerning the actual position as the results of delivery of the spot information. The acquisition part 113 acquires image data concerning the actual position when the request signal for transmission is received. The transmission part 114 transmits the acquired image data to the second communication terminal 120 which has transmitted the request signal for transmission. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a communication terminal, a data transmission method, a data reception method, a data transmission program, a data reception program, and a recording medium used for data transmission / reception between users. However, use of the present invention is not limited to the communication terminal, data transmission method, data reception method, data transmission program, data reception program, and recording medium described above.

  2. Description of the Related Art Conventionally, with the development of network infrastructure and the spread of information communication terminals, data (information) is transferred between individual users via a network, and a community sharing the same information is formed.

  In such a community, for example, another mobile terminal receives a signal transmitted from a mobile terminal within the short-range wireless communication range by the short-range wireless communication unit, and exchanges necessary data. The received data is displayed on the display unit, and a transition to the next phase is prompted. Next, a connection is made to a server on the wide area network by the wide area wireless communication unit, confirming the identity of the other party and prompting the transition to the next phase. At this point, the personal details data is exchanged between the terminals (for example, see Patent Document 1 below).

JP 2001-333451 A

  However, according to the above-described prior art, there is a problem that it is impossible to know whether or not the information held by the communication partner is the information that the communication partner needs. In particular, when there are a large number of communicable parties, there is a problem that it is necessary to efficiently determine from which communication partner information is acquired.

  Moreover, even if the current position of the communication partner can be specified to some extent, there is a problem that information held by the communication partner is not necessarily related to the location. In particular, in communication using a movable communication terminal, there is a problem that an important factor for determining whether or not information is acquired is an important factor for determining where the information is related.

  Furthermore, there is a problem that information held by the communication partner cannot know the time (time) generated. In particular, for information that changes from moment to moment, the information that has passed since it was generated has no information value, and when the information was generated or not An example is the problem of being an important factor in determining

  In order to solve the above-mentioned problems and achieve the object, a communication terminal according to the invention of claim 1 is a communication terminal in a communication network composed of a plurality of communication terminals capable of communicating with each other, Distribution means for distributing the point information of the point to other communication terminals other than the communication terminal, and as a result of the distribution of the point information by the distribution means, a transmission request signal of video data relating to the current point is transmitted to the other communication terminal. When the transmission request signal is received by the reception means, the acquisition means for acquiring the video data relating to the current location, and the transmission request signal for transmitting the video data acquired by the acquisition means Transmitting means for transmitting to the communication terminal.

  The communication terminal according to the invention of claim 5 is a communication terminal in a communication network composed of a plurality of communication terminals capable of communicating with each other, and the location information of the current location of other communication terminals other than the communication terminal is obtained. A first receiving means for receiving, an output means for outputting the spot information received by the first receiving means, and when the spot information is outputted by the output means, the current spot of the other communication terminal Input means for accepting an input of a transmission request for video data; a transmission means for transmitting a transmission request signal for video data relating to the current location when the transmission request is input by the input means; and the transmission by the transmission means Second reception means for receiving video data related to the current location from the other communication terminal as a result of transmission of the request signal. .

  A data transmission method according to an eighth aspect of the invention is a data transmission method using a communication terminal in a communication network composed of a plurality of communication terminals capable of communicating with each other, wherein the location information of the current location of the communication terminal is obtained. A distribution step of distributing to other communication terminals other than the communication terminal, and a reception step of receiving a video data transmission request signal related to the current location from the other communication terminal as a result of the distribution of the location information by the distribution step. When the transmission request signal is received by the reception step, the acquisition step of acquiring the video data regarding the current location, and the video data acquired by the acquisition step are transmitted to the communication terminal that has transmitted the transmission request signal. A transmission step.

  According to a ninth aspect of the present invention, there is provided a data receiving method using a communication terminal in a communication network composed of a plurality of communication terminals capable of communicating with each other. A first receiving step of receiving point information of a current point; an output step of outputting point information received by the first receiving step; and An input step for receiving an input of a transmission request for video data relating to the current location of the communication terminal; and a transmission step for transmitting a transmission request signal for video data relating to the current location if there is an input for the transmission request in the input step; As a result of the transmission request signal being transmitted in the transmission step, a second receiver that receives video data related to the current location from the other communication terminal Characterized in that it comprises a and.

  According to a tenth aspect of the present invention, a data transmission program causes a computer to execute the data transmission method according to the eighth aspect.

  A data reception program according to an invention of claim 11 causes a computer to execute the data reception method according to claim 9.

  A recording medium according to a twelfth aspect of the present invention is readable by a computer in which the data transmission program according to the tenth aspect is recorded.

  A recording medium according to a thirteenth aspect of the present invention is readable by a computer in which the data receiving program according to the eleventh aspect is recorded.

  Exemplary embodiments of a communication terminal, a data transmission method, a data reception method, a data transmission program, a data reception program, and a recording medium according to the present invention are explained in detail below with reference to the accompanying drawings.

(Embodiment)
First, the functional configuration of the data transmission / reception system according to the embodiment will be described. FIG. 1 is a block diagram of a functional configuration of the data transmission / reception system according to the embodiment. 1, the data transmission / reception system 100 includes a first communication terminal 110 that transmits video data and a second communication terminal 120 that receives video data. The first communication terminal 110 and the second communication terminal 120 are communication terminals in a communication network including a plurality of communication terminals that can communicate with each other.

  The first communication terminal 110 includes a distribution unit 111, a reception unit 112, an acquisition unit 113, a transmission unit 114, and a determination unit 115. The distribution unit 111 distributes the location information of the current location of the first communication terminal 110 to other communication terminals including the second communication terminal 120. The location information of the current location is, for example, latitude and longitude information of the current location of the first communication terminal 110. Specifically, the distribution unit 111 specifies the current position of the first communication terminal 110 based on, for example, a GPS signal received by the GPS receiver.

  Specifically, for example, the distribution unit 111 transmits point information using a broadcast address that transmits information to all communication terminals in the communication network. In addition, the distribution unit 111 transmits the point information only to the communication terminal located in the communication area of the specific base station, specifies the communication address of the second communication terminal 120, etc. It is good also as distributing point information etc. only to the limited one of them.

  The reception unit 112 receives a transmission request signal for video data related to the current location from other communication terminals including the second communication terminal 120 as a result of the location information being delivered by the delivery unit 111. The transmission request signal received by the receiving unit 112 may specify the length of the video data and the direction from which the video data showing the current location is desired.

  The acquisition unit 113 acquires video data related to the current location when the transmission request signal is received by the reception unit 112. Here, the video data includes still images and moving images. If the transmission request signal received by the reception unit 112 specifies the length of the video data or the direction from which the video data showing the current location is desired, the acquisition unit 113 specifies the specified condition. Get video based on.

  For example, when the transmission request signal is received by the receiving unit 112, acquisition of video data may be started, or acquisition may be started after a predetermined time after the transmission request signal is received. In addition, after the start of the acquisition of the video data, the acquisition may be stopped after a predetermined time has elapsed, or the acquisition may be stopped by an instruction from the user of the first communication terminal 110. Furthermore, the acquisition unit 113 acquires video data based on the determination result of the determination unit 115 when the determination unit 115 described below makes a determination.

  At this time, additional information supplementing the acquired video data may be attached. For example, if it is possible to attach an explanation or actual situation of an event reflected in video data by text or voice, the value as information can be improved.

  The transmission unit 114 transmits the video data acquired by the acquisition unit 113 to the communication terminal that transmitted the transmission request signal. For example, the transmission unit 114 specifies the communication address of the second communication terminal 120 from the transmission request signal received by the reception unit 112 and transmits the video data. Note that the video data may be transmitted as a single file of video data captured for a certain period of time or may be streamed in real time. Further, depending on the format of the video data and additional information, a plug-in necessary for use at the transmission destination may be attached and transmitted.

  The determination unit 115 determines whether to acquire video data based on the elapsed time from distribution by the distribution unit 111 and whether or not the transmission request signal is received by the reception unit 112. Specifically, for example, the determination unit 115 determines that the video data is not acquired even if the transmission request signal is received after a predetermined time or more has elapsed since the distribution by the distribution unit 111.

  Next, a functional configuration of the second communication terminal 120 will be described. The second communication terminal 120 includes a first reception unit 121, an output unit 122, an input unit 123, a transmission unit 124, and a second reception unit 125.

  The first receiving unit 121 receives the location information of the current location of the first communication terminal 110 that is a communication terminal other than the second communication terminal 120. As described above, the location information of the current location is, for example, latitude and longitude information of the current location of the first communication terminal 110.

  The output unit 122 outputs the spot information received by the first receiving unit 121. The output unit 122 displays, for example, a drawing of the spot information on a map, displays the spot information in text format on the screen, and outputs a voice.

  When the location information is output by the output unit 122, the input unit 123 receives an input of a transmission request for video data related to the current location of the first communication terminal 110 that is another communication terminal. At this time, the length of the video data, the direction from which the video data showing the current location is desired, and the video data transmission method (batch transmission or streaming) may be designated.

  Specifically, the input unit 123 accepts a data transmission request made by the user based on the information output by the output unit 122, for example. Specifically, the input unit 123 receives an input of a video data transmission request by using, for example, an operation button, a touch panel, a voice input device, or the like.

  The transmission unit 124 transmits a transmission request signal for video data when a transmission request is input by the input unit 123. For example, the transmission unit 124 specifies the communication address of the first communication terminal 110 from the point information received by the first reception unit 121 and transmits a transmission request signal.

  As a result of the transmission request signal being transmitted by the transmission unit 124, the second reception unit 125 receives video data related to the current location from the first communication terminal 110, which is another communication terminal. The second receiving unit 125 may receive video data related to the current location when the transmission request signal is transmitted, or may receive video data related to the current location within a predetermined time after transmitting the transmission request signal. Also good. That is, video data showing the current location immediately after transmission of the transmission request signal may be received, or video data showing the current location after a predetermined time may have been received after transmission of the transmission request signal.

  Next, a procedure of data transmission / reception processing by the data transmission / reception system 100 will be described. Hereinafter, the data transmission process of the first communication terminal 110 that performs data transmission and the data reception process of the second communication terminal 120 that performs data reception will be described separately. FIG. 2 is a flowchart showing a procedure of data transmission processing of the first communication terminal.

  In the flowchart of FIG. 2, the first communication terminal 110 first distributes the location information of the current location to other communication terminals including the second communication terminal 120 by the distribution unit 111 (step S201). Then, the receiver 112 waits for reception of a data transmission request signal from other communication terminals including the second communication terminal 120 (step S202: No loop).

  When the data transmission request signal is received (step S202: Yes), the acquisition unit 113 acquires video data relating to the current location (step S203). At this time, when the start time of video data acquisition and the length of the video to be acquired are specified, the video is acquired in accordance with the specification. The determination unit 115 may determine whether to acquire video data based on the elapsed time from distribution by the distribution unit 111 and whether or not the transmission request signal is received by the reception unit 112.

  Then, the transmission unit 114 transmits the video data to the communication terminal that has transmitted the transmission request signal (step S204), and the processing according to this flowchart ends. Video data may be transmitted as a file of video data taken for a certain period of time or may be streamed in real time.

  Next, processing performed by the second communication terminal 120 will be described. FIG. 3 is a flowchart showing a procedure of data reception processing of the second communication terminal. In the flowchart of FIG. 3, first, the second communication terminal 120 waits until the first receiving unit 121 receives the point information of the first communication terminal 110 (step S301: No loop). When the spot information is received (step S301: Yes), the spot information received in step S301 is output by the output unit 122 (step S302).

  Then, it is determined whether or not a video data transmission request is input from the user by the input unit 123 (step S303). When a video data transmission request is input (step S303: Yes), a video data transmission request signal is transmitted to the first communication terminal 110 (step S304). On the other hand, when a video data transmission request is not input (step S303: No), the process returns to step S301, and the subsequent processing is repeated.

  In step S304, when the video data transmission request signal is transmitted to the first communication terminal 110, the second reception unit 125 waits until the video data is received (step S305: No loop) and receives the video data. Then (step S305: Yes), the process according to this flowchart is terminated.

  As described above, according to the data transmission / reception system 100 according to the embodiment, in the communication network including a plurality of communication terminals that can communicate with each other, the video data relating to the current position acquired by the first communication terminal 110 is obtained. And transmitted to other communication terminals including the second communication terminal 120. Thereby, the second communication terminal 120 can acquire video data related to the current location of the first communication terminal 110 or video data close thereto.

  At that time, by distributing the point information of the first communication terminal 110 in advance, whether or not to request transmission of the video data to the user of the other communication terminal, that is, the video data at that point is necessary for itself. It can be judged whether it is information. Thereby, the user of each communication terminal can access the data he needs more accurately.

  Further, the video data acquisition deadline is determined by determining whether or not to acquire video data based on the elapsed time from the distribution of the location information and the like and the reception of the transmission request signal. Thereby, for example, it is avoided that video data different from the content originally desired to be transmitted is distributed to other communication terminals due to, for example, a change in the surrounding situation or the movement of the first communication terminal 110. can do.

  Next, an example of the data transmission / reception system 100 according to the above-described embodiment will be described. In the following embodiment, a case where the data transmission / reception system 100 is applied to a data transmission / reception system 400 using a navigation device mounted on a vehicle will be described.

  First, the system configuration of the data transmission / reception system 400 according to the embodiment will be described. FIG. 4 is an explanatory diagram of a system configuration of the data transmission / reception system according to the embodiment. In FIG. 4, vehicles 410 and 420 (420a to 420e) are traveling on roads L1 and L2.

  In addition, navigation devices 411 and 421 (421a to 421e) are mounted on the vehicles 410 and 420, respectively. The navigation devices 411 and 421 communicate with the roadside devices 430 (430a to 430c) installed on the sides of the roads on which the vehicles 410 and 420 travel, respectively, and transmit and receive data.

  The roadside machines 430a to 430c are each connected to a network, and the communication areas are areas A, B, and C indicated by dotted lines in FIG. The vehicles 410 and 420 that have entered the communication areas of the roadside devices 430a to 430c are connected to the network via the roadside devices 430a to 430c to transmit and receive data. In addition to the illustration, the roadside machine 430 is installed so as to cover a point where the vehicles 410 and 420 can enter, such as a road and a parking lot, as a communication area.

  For each of the vehicles 410 and 420, an ID for identifying the vehicle is uniquely assigned to each of the vehicles 410 and 420, for example, as an IP address. This ID is used as a communication address in the data transmission / reception system 400, and the navigation devices 411 and 421 can transmit information to specific vehicles 410 and 420 using the IDs of the vehicles 410 and 420. The IDs of the vehicles 410 and 420 are stored in the navigation devices 411 and 421, respectively.

  Further, the navigation devices 411 and 421 can transmit information using a “broadcast address” that is a common address of the vehicles 410 and 420 in the communication area of all the roadside devices 430. By using the broadcast address, data can be transmitted to unspecified vehicles 410 and 420 even when the IDs of the individual vehicles 410 and 420 are not known. Further, a broadcast address for each roadside machine 430 may be provided. For example, when information is distributed using the broadcast address for the roadside machine 430a, the information is distributed to the vehicles 410 and 420 in the area A.

  In addition, each of the navigation devices 411 and 421 includes a camera for video shooting. The camera can capture still images and moving images. In addition, it is possible to capture still image data and video data captured using a digital camera or a mobile phone camera. Passengers of the vehicles 410 and 420 can transmit video data captured by the cameras of the navigation devices 411 and 412 or captured from other devices to the other vehicles 410 and 420 via the network.

  On the other hand, the passengers of the other vehicles 410 and 420 determine whether or not the video data to be transmitted is necessary, and then determine whether or not to receive the transmission. For example, if the vehicle 410, 420 near the current position of the vehicle, the vehicle 410, 420 at the point where the vehicle is going to travel, the video data transmitted from the vehicle, or the video data of the field of interest may be received. Is expensive.

  Hereinafter, the vehicle that provides (sends) video data will be described as a vehicle 410, and the vehicle that provides (receives) video data will be described as a vehicle 420. 410 and 420 may be the transmission side and the reception side.

(Hardware configuration of navigation devices 411 and 421)
Next, the hardware configuration of the navigation devices 411 and 421 will be described. FIG. 5 is a block diagram illustrating a hardware configuration of the navigation apparatus. In FIG. 5, a navigation device 411, 421 includes a CPU 501, a ROM 502, a RAM 503, a magnetic disk drive 504, a magnetic disk 505, an optical disk drive 506, an optical disk 507, an audio I / F (interface) 508, A microphone 509, a speaker 510, an input device 511, a video I / F 512, a display 513, a communication I / F 514, and a GPS receiver 515 are provided. In addition, the components 501 to 515 are connected by a bus 520, respectively.

  First, the CPU 501 governs overall control of the navigation devices 411 and 421. The ROM 502 records programs such as a boot program, a communication program, a database creation program, and a data analysis program. The RAM 503 is used as a work area for the CPU 501.

  The magnetic disk drive 504 controls the reading / writing of the data with respect to the magnetic disk 505 according to control of CPU501. The magnetic disk 505 records data written under the control of the magnetic disk drive 504. As the magnetic disk 505, for example, an HD (hard disk) or an FD (flexible disk) can be used.

  The optical disk drive 506 controls reading / writing of data with respect to the optical disk 507 according to the control of the CPU 501. The optical disk 507 is a detachable recording medium from which data is read according to the control of the optical disk drive 506. As the optical disc 507, a writable recording medium can be used. In addition to the optical disk 507, the removable recording medium may be an MO, a memory card, or the like.

  The audio I / F 508 is connected to a microphone 509 for audio input and a speaker 510 for audio output. The sound received by the microphone 509 is A / D converted in the sound I / F 508. In addition, sound is output from the speaker 510. Note that the sound input from the microphone 509 can be recorded as sound data on the magnetic disk 505 or the optical disk 507.

  Further, examples of the input device 511 include a remote controller, a keyboard, a mouse, a touch panel, and the like provided with a plurality of keys for inputting characters, numerical values, various instructions, and the like. Further, the input device 511 can be connected to another information processing terminal (hereinafter simply referred to as a device) such as a digital camera to input / output data.

  In addition, the input device 511 includes a camera that can capture still images and moving images (videos). Still images and moving images shot by the camera can be recorded on the magnetic disk 505 or the optical disk 507 as video data. It is also possible to connect other devices such as a handheld digital camera or mobile phone to the input device 511 and capture video data captured by each device.

  The video I / F 512 is connected to the display 513. Specifically, the video I / F 512 includes, for example, a graphic controller that controls the entire display 513, a buffer memory such as a VRAM (Video RAM) that temporarily records image information that can be displayed immediately, and a graphic controller. Based on the output image data, the display 513 is configured by a control IC or the like.

  The display 513 displays icons, cursors, menus, windows, or various data such as characters and images. As the display 513, for example, a CRT, a TFT liquid crystal display, a plasma display, or the like can be adopted.

  The communication I / F 514 is connected to a communication network via radio and functions as an interface between the navigation devices 411 and 421 and the CPU 501. The communication I / F 514 is further connected to a communication network such as the Internet via wireless, and also functions as an interface between the communication network and the CPU 501.

  Communication networks include LANs, WANs, public line networks and mobile phone networks. Specifically, the communication I / F 514 includes, for example, an FM tuner, a VICS (Vehicle Information and Communication System) / beacon receiver, a radio navigation device, and other navigation devices. Get road traffic information such as regulations. VICS is a registered trademark.

  Further, the GPS receiver 515 acquires information indicating the current positions of the vehicles 410 and 420 (current positions of the navigation devices 411 and 421) using output values from GPS (Global Positioning System) and various sensors. The information indicating the current position is information for specifying one point on the map information such as latitude and longitude.

(Data transmission / reception processing of the data transmission / reception system 400)
Next, a procedure of data transmission / reception processing performed by the data transmission / reception system 400 will be described. Hereinafter, the processing performed by the navigation device 411 of the vehicle 410 that transmits data and the processing performed by the navigation device 421 of the vehicle 420 that receives data will be described separately.

  FIG. 6 is a flowchart illustrating a procedure of data transmission processing of the vehicle navigation apparatus that transmits data. In the flowchart of FIG. 6, the navigation apparatus 411 waits until a point information transmission request is input (step S601: No loop). For example, when a passenger of the vehicle 410 wants to convey the current surrounding situation to the surroundings, such as when the vehicle is involved in a traffic jam, a point information transmission request is input.

  When the point information transmission request is input (step S601: Yes), the navigation device 411 uses the broadcast address to distribute the point information to the navigation device 421 of the other vehicle 420 (step S602). In the point information, in addition to the position information of the current position of the vehicle 410, presence / absence of a video data category (for example, video regarding traffic jams, video regarding landscapes, etc.) and additional information (for example, voice information and text information for situational explanation) Etc. may be included, and if these contents do not change, only the point information may be transmitted.

  In addition, a transmission time limit may be set for the video data. For example, information that fluctuates with the passage of time, such as when it is desired to convey traffic jam information, has no information value if the traffic jam is resolved or the situation changes as the vehicle leaves the traffic jam. For this reason, for example, after the point information is transmitted, it may be set so that the video data is not shot after a predetermined time has elapsed.

  On the other hand, for example, when the vehicle 410 is stationary at a certain point, and when it is desired to transmit video data without fixed time limit as fixed point observation, it may be set to “permanent transmission” or the like. Further, for example, a camera may be installed not only on a moving body such as the vehicles 410 and 420 but also on a feature near the road such as a traffic light. In this case as well, “permanent transmission” may be used without setting an access time limit. The user can always obtain video data at a fixed location.

  Further, a data transmission request notification is distributed only within a specific area, for example, by using a broadcast address transmitted only to a vehicle 420 in a specific base station, instead of a broadcast address transmitted to all vehicles 420. May be. In addition, for example, a broadcast address that can specify a group of acquaintances or a group having terminals that can receive a specific service may be used.

  Returning to the description of FIG. 6, the navigation device 411 determines whether a video data transmission request signal is received from the navigation device 421 of another vehicle 420 (step S <b> 603). When the video data transmission request signal is received (step S603: Yes), the video data shooting is started by the camera provided in the navigation device 411 (step S604).

  On the other hand, when the video data transmission request signal is not received (step S603: No), the process returns to step S602, and the distribution of the spot information is continued. This is because the vehicle 410 often moves and the current position changes from moment to moment. Note that the transmission of the spot information is continued even when the processing from step S604 is performed.

  And it waits until predetermined time passes (step S605: No loop), and when predetermined time passes (step S605: Yes), imaging | photography will be complete | finished (step S606). Here, the predetermined time is a photographing time set in advance by a passenger of the vehicle 410 or a photographing time designated by a transmission applicant included in the video data transmission request signal. If necessary, additional information is attached to the acquired video data.

  Subsequently, the video data is transmitted to the navigation device 421 of the vehicle 420 that has transmitted the video data transmission request signal (step S607), and the processing according to this flowchart ends. In addition to transmitting the video data collected for a predetermined time in this way, streaming transmission may be performed in which the captured video data is immediately transmitted.

  Further, if the received video data transmission request signal has a request that data further narrowed down to a specific region or direction is desired, the data may be narrowed down to the corresponding region. If there is a plug-in necessary to use the data, it is transmitted together with the data.

  Next, processing performed by the navigation device 421 of the vehicle 420 that receives data will be described. FIG. 7 is a flowchart illustrating a procedure of data reception processing of the vehicle navigation apparatus that receives data. In the flowchart of FIG. 7, the navigation device 421 first waits until point information is received from the navigation device 411 of the vehicle 410 (step S701: No loop).

  When the spot information is received (step S701: Yes), the received spot information is output by screen display by the display 513, voice output from the speaker 510, or the like (step S702). As described in step S602 of FIG. 6, the point information includes information about the category of data and the presence / absence of additional information. The navigation device 421 outputs these pieces of information and waits for a determination as to whether or not the passenger of the vehicle 420 receives data. That is, it is determined whether or not a video data transmission request for requesting transmission of video data to the vehicle 410 is input (step S703).

  When it is determined that the passenger receives the video data and a video data transmission request for transmission of the video data is input (step S703: Yes), the navigation device 421 sends a video data transmission request signal to the navigation device 411. A reply is made (step S704). At this time, the address of the navigation device 411 as a reply destination is specified using the transmission source address of the spot information received in step S701. In addition, in the case where video data of a specific area or direction is desired, the district name or direction may be transmitted.

  Then, it waits until the video data requested to be transmitted is received (step S705: No loop). When the video data is received (step S705: Yes), the processing according to this flowchart is terminated. On the other hand, when a video data transmission request is not input in step S703 (step S703: No), the process returns to step S701 and the subsequent processing is repeated.

  Here, an example of the output form of the spot information performed in step S702 will be described. FIG. 8 is an explanatory diagram illustrating an example of a screen display of point information. A new arrival message 801 of point information is displayed on the display 513 of the navigation device 421.

  In the new arrival message 801, sender information 811, position information 812, category information 813, reception date / time information 814, access time limit information 815, and additional information presence / absence information 816 regarding the new arrival point information are displayed.

  The sender information 811 is information for specifying a transmission source of point information such as IDs of the vehicles 410 and 420, for example. The position information 812 indicates the current position of the point information transmission source. The category information 813 indicates what category the content of the transmitted video data belongs to. The reception date / time information 814 indicates the date / time when the location information is received. The access time limit information 815 indicates the video data transmission time limit set by the point information sender. Additional information presence / absence information 816 indicates the presence / absence of additional information regarding video data.

  Furthermore, a received point information list 821 that is a list of already received point information is displayed. Similar to the new arrival message 801, the sender information 831, position information 832, category information 833, reception date / time information 834, access time limit information 835, and additional information presence / absence information 836 are displayed in the received point information list 821.

  The user refers to these pieces of information to determine whether or not to send a video data transmission request to the point information transmission source. When video data is received, the point information is selected and a video data transmission request signal is returned (see step S704 in FIG. 7).

  In the illustrated example, the data list is displayed in the order of reception date and time, but the data can be sorted or selected according to each information. Further, data can be narrowed down by inputting a keyword in the search input box 841 or selecting a genre of data from the genre selection box 842. Note that data whose access time limit has passed is deleted from the received point information list 821.

  When the “display on map” button 851 is pressed, the points indicated by the position information 812 and 832 of the received point information are drawn and displayed on the map information stored in the navigation device 421. This makes it possible for the user to intuitively grasp a point where a video data transmission request can be made.

  Thus, when displaying point information on a map, it is good also as displaying the change of the present position of the vehicle 410 which transmitted point information with a point and an icon. For example, the current location information is periodically received from the transmission source between the transmission of the location information and the access deadline, and the points and icons on the map are moved based on the received information. As a result, it is possible to more accurately grasp which point the video data transmitted from the point information transmission source is.

  Further, when the “display only on route” button 852 is pressed, only the point information on the route to the destination point set by the navigation device 421 is displayed. Thereby, the user can display only the point information on the route on which the own vehicle will travel and obtain video data of the current situation.

  As described above, according to the data transmission / reception system 400, based on the video data transmission request from the navigation device 421, the navigation device 411 captures video data regarding the current position of the vehicle 410 and transmits the video data to the navigation device 421. Thereby, the passenger of the vehicle 420 can acquire the video regarding the current location of the vehicle 410 in real time or close to it.

  In addition, by distributing the spot information of the vehicle 410 in advance, it is determined whether or not the user of the vehicle 420 is requested to transmit video data, that is, whether or not the video data at the spot is necessary information for the user. Judgment can be made. Thereby, the user of each communication terminal can access the data he needs more accurately.

  In addition, when shooting video data, an access time limit is set, and the display of point information is updated in real time. Thus, for example, the video data that is different from the content that the passenger who requested the transmission of the video data originally desires to transmit because the vehicle 410 that transmitted the location information moves or the surrounding situation changes. Can be avoided.

  The data transmission / reception method described in this embodiment can be realized by executing a program prepared in advance on a computer such as a personal computer or a workstation. This program is recorded on a computer-readable recording medium such as a hard disk, a flexible disk, a CD-ROM, an MO, and a DVD, and is executed by being read from the recording medium by the computer. The program may be a transmission medium that can be distributed via a network such as the Internet.

It is a block diagram which shows the functional structure of the data transmission / reception system concerning embodiment. It is a flowchart which shows the procedure of the data transmission process of a 1st communication terminal. It is a flowchart which shows the procedure of the data reception process of a 2nd communication terminal. It is explanatory drawing which shows the system configuration | structure of the data transmission / reception system concerning an Example. It is a block diagram which shows the hardware constitutions of a navigation apparatus. It is a flowchart which shows the procedure of the data transmission process of the navigation apparatus of the vehicle which transmits data. It is a flowchart which shows the procedure of the data reception process of the navigation apparatus of the vehicle which receives data. It is explanatory drawing which shows an example of the screen display of point information.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Data transmission / reception system 110 1st communication terminal 111 Distribution part 112 Receiving part 113 Acquisition part 114 Transmission part 115 Judgment part 120 2nd communication terminal 121 1st receiving part 122 Output part 123 Input part 124 Transmission part 125 2nd Receiver

Claims (13)

A communication terminal in a communication network composed of a plurality of communication terminals capable of communicating with each other,
Distribution means for distributing the location information of the current location of the communication terminal to a communication terminal other than the communication terminal;
As a result of the location information being delivered by the delivery means, receiving means for receiving a transmission request signal of video data relating to the current location from the other communication terminal;
When a transmission request signal is received by the reception means, an acquisition means for acquiring video data relating to the current location;
Transmitting means for transmitting the video data acquired by the acquiring means to the communication terminal that transmitted the transmission request signal;
A communication terminal comprising: The acquisition means includes
2. The communication terminal according to claim 1, wherein acquisition of the video data is started when a transmission request signal is received by the receiving means. The acquisition means includes
The communication terminal according to claim 1, wherein the acquisition is stopped after a predetermined time has elapsed after the start of the acquisition of the video data. A determination unit that determines whether to acquire the video data based on an elapsed time from distribution by the distribution unit and whether or not the transmission request signal is received by the reception unit;
The acquisition means includes
The communication terminal according to claim 1, wherein the video data is acquired based on a determination result determined by the determination unit. A communication terminal in a communication network composed of a plurality of communication terminals capable of communicating with each other,
A first receiving means for receiving point information of a current point of a communication terminal other than the communication terminal; an output means for outputting the point information received by the first receiving means;
When the location information is output by the output means, an input means for receiving an input of a video data transmission request regarding the current location of the other communication terminal;
When the transmission request is input by the input means, a transmission means for transmitting a transmission request signal of video data related to the current location;
Second receiving means for receiving video data relating to the current location from the other communication terminal as a result of the transmission request signal being transmitted by the transmitting means;
A communication terminal comprising: The second receiving means includes
The communication terminal according to claim 5, wherein the communication terminal receives video data relating to the current location when the transmission request signal is transmitted. The second receiving means includes
The communication terminal according to claim 5, wherein video data relating to the current location within a predetermined time after transmitting the transmission request signal is received. A data transmission method using a communication terminal in a communication network composed of a plurality of communication terminals capable of communicating with each other,
A distribution step of distributing the location information of the current location of the communication terminal to a communication terminal other than the communication terminal;
As a result of the location information being delivered by the delivery step, a reception step of receiving a transmission request signal of video data related to the current location from the other communication terminal;
When a transmission request signal is received by the reception step, an acquisition step of acquiring video data related to the current location;
A transmission step of transmitting the video data acquired by the acquisition step to the communication terminal that transmitted the transmission request signal;
A data transmission method comprising: A data receiving method using a communication terminal in a communication network composed of a plurality of communication terminals capable of communicating with each other,
A first receiving step of receiving point information of a current point of a communication terminal other than the communication terminal;
An output step of outputting the spot information received by the first reception step;
When the point information is output by the output step, an input step of receiving an input of a video data transmission request regarding the current point of the other communication terminal;
When there is an input of the transmission request by the input step, a transmission step of transmitting a transmission request signal of video data related to the current location;
As a result of the transmission request signal being transmitted by the transmission step, a second reception step of receiving video data relating to the current location from the other communication terminal;
A data receiving method comprising:   A data transmission program for causing a computer to execute the data transmission method according to claim 8.   A data receiving program for causing a computer to execute the data receiving method according to claim 9.   A computer-readable recording medium on which the data transmission program according to claim 10 is recorded. A computer-readable recording medium on which the data receiving program according to claim 11 is recorded.

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