JP2010054293A - In-vehicle image data transfer system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image data transfer system for effectively utilizing a transfer band of an in-vehicle network, according to vehicle speed. <P>SOLUTION: A transfer frequency of various image data, such as, a navigation map image data and a device operation image data, with respect to the data required through the in-vehicle network 207, is calculated per type in response to the vehicle speed. Various image data are transferred to the in-vehicle network 207, according to the calculated transfer frequency. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a data transfer system, and more particularly to an in-vehicle image transfer system in an in-vehicle network.

  The construction of an in-vehicle network for multimedia, which is configured in a car with multimedia devices such as car navigation devices and DVD devices, is progressing mainly by automobile manufacturers.

  FIG. 1 is an example of the in-vehicle network, and the connection of each device is described in a network configuration conforming to IDB-1394 which is a protocol of the in-vehicle network. The various multimedia devices 101 and the display monitor 102 in FIG. 1 are configured as an integrated device, and the various multimedia devices 101 are operated by an external input such as a touch panel displayed on the monitor 1. The integrated device is installed on the front seat 105 side and is referred to as a main terminal 108. In addition, a device including the display monitors 103 and 104 is connected to the main terminal 108 via a network. These are installed on the rear seat 106 side and are called sub-terminals 109 and 110.

  Navigation map data for car navigation and touch panel input devices from various multimedia devices 101 included in the main terminal 108 to the subterminal 1 (109) and the subterminal 2 (110) via the in-vehicle network 107 Operation device operation image data and the like are transferred and displayed on the display monitors 103 and 104.

  As a result, various multimedia devices 101 that were conventionally installed only on the front seat 105 side for operation and viewing mainly by the driver can be viewed individually by the passengers other than the driver operating from the rear seat 106 side. Is possible.

  Also, the multimedia device 101 connected to the in-vehicle network mainly distributes image data. Therefore, when these devices operate simultaneously, large-capacity image data is transferred to the network.

  Patent Document 1 describes a car navigation device that changes the distribution of CPU resources for each operation process according to the vehicle speed of the host vehicle.

  In Patent Document 2, once the traffic information displayed on the navigation screen is saved for comparison and compared with the subsequent traffic information. If it is determined that the traffic information is exactly the same, the navigation information is used to eliminate the troublesomeness. It describes how to provide road traffic information that is not displayed again on the screen.

  Further, in Patent Document 3, in a vehicle-mounted digital television, an on-vehicle TV system that monitors a reception state of a TV radio wave during traveling, predicts a break in a moving image due to a deterioration in the reception state, and complements the break in the image with a still image. Is described.

These patent documents do not describe an in-vehicle network.
JP2001-99662 JP2005-127887 JP2006-222509

  However, conventionally, since the transfer band of the in-vehicle network is limited, the image data transfer amount may exceed the transfer band, and transfer errors and delays may occur.

  On the other hand, the priority with respect to each image data changes with vehicle speed. For example, in a car navigation device, the user cannot specify the position of the vehicle unless the map is frequently rewritten on the monitor during high-speed driving. Therefore, the priority for the map image data for navigation increases during high-speed driving. The operation of the car navigation device is mainly performed while the host vehicle is stopped or driving at a low speed. Therefore, the priority for the device operation image data is increased during low-speed operation.

  Accordingly, an object of the present invention is to provide an in-vehicle image data transfer apparatus that effectively uses a transfer band of an in-vehicle network according to the vehicle speed.

  According to one aspect, in the in-vehicle image transfer apparatus included in the image data generation apparatus in the in-vehicle network system in which the image data generation apparatus and the image display apparatus are connected via a network, the image data generation apparatus generates the image data generation apparatus. The transfer frequency of the image data is changed according to the type of image data and the vehicle speed generated by the vehicle speed sensor, and the image data is transferred to the image display device via the network according to the transfer frequency.

  According to the above invention, the transfer band can be effectively used according to the vehicle speed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the technical scope of the present invention is not limited to these embodiments, but extends to the matters described in the claims and equivalents thereof.

  The in-vehicle image transfer device according to the present embodiment calculates transfer frequency according to the vehicle speed for image data such as navigation map image data and device operation image data required via the in-vehicle network. Then, transfer frequency calculation control for transferring various image data to the in-vehicle network is performed according to the calculated transfer frequency.

  First, the types of image data transferred to the in-vehicle network and the classification of these various image data according to the vehicle speed will be described. In order to clarify the following description, the types of image data are limited, but the image data actually transferred via the in-vehicle network in the present embodiment is limited to the types of image data described below. Absent.

  As described above, the priority of various image data changes according to the vehicle speed. They are classified into two types: image data prioritized during high speed operation and image data prioritized during low speed operation. Hereinafter, image data prioritized during high-speed operation is referred to as high-speed image data, and image data prioritized during low-speed operation is referred to as low-speed image data.

  In addition to the above-described navigation map image data, the high-speed image data includes video from a camera outside the vehicle and monitor monitor image data representing vehicle body conditions such as engine abnormality of the vehicle body. Further, the device operation image data which is the low-speed image data includes device command data for operating the device in addition to the navigation operation image data and the DVD operation image data.

  This device command data is generated as a result of operating the device operation image displayed on the monitor screen with the touch panel, transferred to each device via the in-vehicle network, and each device is operated accordingly.

  For example, when the navigation device of the main terminal is operated from the sub terminal via the in-vehicle network, and the device operation image data for operation of the navigation device is displayed on the monitor screen with the touch panel of the sub terminal, By pressing a button on the touch panel for requesting map image data for navigation, the device command data is transferred to the navigation device of the main terminal via the in-vehicle network. Then, in response to the device command data, the navigation device transfers the navigation map image to the monitor device of the sub-terminal via the in-vehicle network.

  In the present embodiment, navigation operation image data is distinguished from device operation image data for other device operations.

  Thus, the high-speed image data will be described as navigation map image data and monitoring monitor image data, and the low-speed image data will be described as navigation operation image data and device operation image data.

[First embodiment]
FIG. 2 is a schematic diagram of an in-vehicle network configuration for explaining the first embodiment. The network configuration of FIG. 2 is the same as that of FIG. 1, and includes a main terminal 208, a sub terminal 1 (209), and a sub terminal 2 (210).

  Each of the terminals 208, 209, and 210 has a 1394 interface, and is connected to the network through them. The control unit 11 included in each of the terminals 208, 209, and 210 performs image data transfer frequency calculation control according to the vehicle speed data S2 generated by the vehicle speed sensor unit 12 that calculates the vehicle speed.

  In order to explain the transfer frequency calculation control of the in-vehicle network in FIG. 2, each device constituting the in-vehicle network will be described.

  First, the function and operation of each part constituting the main terminal 208 will be described.

  FIG. 3 is a block diagram of the image data transfer apparatus provided in the main terminal 208 in the first embodiment.

  The DVD device 1 and the navigation device 2 are connected to the CPU 3, the external input device 24, and the monitor 25 via the bus 26, and are operated by device command data transmitted from the external input device 24 via the bus 26. The external input device 24 may be a touch panel type input device integrated with the monitor 25.

  The control unit 11 is connected to other devices via the in-vehicle network 207 via the 1394 interfaces 18 and 19, and performs bi-directional transfer of image data with these devices. The control unit 11 includes a data processing unit 7 that performs various processes on the image data, a transfer frequency calculation unit 9 that calculates the transfer frequency of various image data according to the vehicle speed, and an in-vehicle network 207. And a data transfer unit 20 that performs packet transfer processing.

  The data processing unit 7 includes an image data transfer management unit 8, an encoder 5, and a decoder 6.

  The image data transfer management unit 8 receives image data g7 and g8 from the DVD device 1 and the navigation device 2. Then, the image data transfer management unit 8 transmits a type transfer request signal S1 corresponding to the type of the input image data g7 and g8 to a transfer frequency calculation unit 9 described later. Then, the image data transfer management unit 8 sends the input image data g7 and g8 to the data transfer unit 20, the image output device 23, or both in accordance with the transfer command signal S4 generated by the transfer frequency calculation unit 9. Transfer (g4, g9). Further, when transferring image data to the data transfer unit 20, the image data transfer management unit 8 transfers the image data after encoding the image data.

  Further, the image data transfer management unit 8 decodes the image data (g4) input from the data transfer unit 20 via the in-vehicle network 207 and transfers it to the image output device 23 (g9).

  The transfer frequency calculation unit 9 includes a frequency calculation unit 10, a frequency control unit 13, and a release signal generation unit 15. Then, according to the vehicle speed data S2 generated by the vehicle speed sensor unit 12 and the type transfer request signal S1 generated by the data processing unit 7 described above, the transfer frequency is calculated, and the transfer command signal S4 is sent to the image data transfer management unit 8. Send.

  The vehicle speed sensor unit 12 is a vehicle speed and acceleration given from a speedometer, a vehicle speed and acceleration given from a tire rotation speed or a tire rotation direction, a vehicle orientation, a stop given from a braking device such as an accelerator or a brake, At least of the information such as traveling conditions such as slow speed, acceleration and deceleration, driving conditions given from the direction of the steering wheel and traveling straight ahead or in a curve, traveling conditions given by gear ratio and gear type, etc. Vehicle speed data S2 is generated with one input. This vehicle speed data S2 may include not only the speed of the host vehicle but also data obtained by quantifying the driving situation. As a result, it is possible to calculate the transfer frequency in accordance with not only the vehicle speed but also the driving situation.

  The frequency calculation unit 10 calculates the frequency data S3 according to the type transfer request signal S1 from the image data transfer management unit 8 and the vehicle speed data S2 from the vehicle speed sensor unit 12.

  The frequency data S3 includes information on whether or not to transfer the image data g7, g8, and g4 input to the image data transfer management unit 8. Further, the frequency data S3 may include information such as the transfer order of the image data g7, g8, g4. Further, the frequency data S3 may be the transfer allocation time of each image data g7, g8, g4.

  The release signal generation unit 15 performs an ON / OFF switching operation of the release signal S5 every time it receives the external signal S6 generated by pressing the frequency control release switch 14 that can be operated from the outside. The release signal S5 is used by the frequency control unit 13 described later as a signal flag for switching whether to perform transfer frequency calculation control.

  This switching function of the transfer frequency calculation control is useful, for example, when an operation of the device is required to change the destination in an emergency during high-speed driving.

  When the release signal S5 generated by the release signal generation unit 15 described above is OFF, for example, the frequency control unit 13 transfers the transfer command signal S4 according to the frequency data S3 generated by the frequency calculation unit 10 described above. Transmit to the management unit 8. Conversely, when the release signal S5 is ON, the frequency data S3 is ignored, and the frequency control unit 13 always transmits the transfer command signal S4 to the image data transfer management unit 8.

  As described above, image data is output from the drawing data transfer management unit 8 in response to the transfer command signal S4. Then, the image data g9 transferred to the image output device 23 is displayed on the monitor 25 via the image output device 23. On the other hand, the image data g4 similarly transferred to the data transfer unit 20 is transferred to each device connected via the in-vehicle network 207.

  The data transfer unit 20 includes a data storage unit 16, a packet processing unit 17, and 1394 interfaces 18 and 19. Then, the image data transferred from the image data transfer management unit 8 is packetized and transferred to the in-vehicle network 207. Conversely, the packets input from the in-vehicle network 207 are packet-combined and output to the transfer management unit 8 as image data (g4).

  The data storage unit (FIFO) 16 is a buffer for temporarily storing and storing various image data g4 continuously transferred from the image data transfer management unit 8, and the image data g4 transferred from the image data transfer management unit 8 The image data g4 is output to the packet processing unit 17 in this order (g3).

  The packet processing unit 17 sequentially packetizes the input image data g3 from the data storage unit. The generated packet is subjected to arbitration control so as not to cause packet interference with transfer packets of other devices connected to the in-vehicle network 207, and from the 1394 interfaces 18 and 19 to the in-vehicle network 207 as packet data g2 according to the arbitration control. Transferred (g1).

  FIG. 4 is an example of a transfer packet form in the first embodiment. The information part of the transfer packet may be configured as shown in FIG. That is, the amount of packet information is allocated according to the frequency of various image data calculated according to the vehicle speed. FIG. 4 shows an example in which the map image data for navigation, the monitor image data, the navigation operation image data, and the device operation image data are simultaneously transferred.

  The packet p1 is a transfer packet when the transfer frequency calculation control is not performed. CS is a cycle start packet and is output at certain intervals. The amount of information of each image data that the packet p1 has is the same.

  The packet p2 is a form of a transfer packet when transfer frequency calculation control is performed during high-speed operation. In the packet p2, the amount of information in the navigation map image data and the monitoring monitor image data, which are high-speed image data, is larger than that in the navigation operation image data and the device operation image data, which are low-speed image data.

  Packet p3 is a form of transfer packet when transfer frequency calculation control is performed during low-speed operation.

  In the packet p3, the navigation operation image data and device operation image data, which are low-speed image data, have a larger amount of information than the navigation map image data and monitoring monitor image data, which are high-speed image data.

  Further, the packet g1 input from the in-vehicle network 207 to the data transfer unit 20 is packet-coupled by the reverse process and transferred to the image data transfer management unit 8 as image data g4.

  If the data g4 transferred to the image data transfer management unit 8 is the device command data for the DVD device 1 or the navigation device 2 described above, the image data transfer management unit 8 sends the device command to each device. Data g7 and g8 are transmitted.

  Next, the configuration of the sub-terminals 209 and 210 connected to the main terminal 208 via the in-vehicle network 207 in FIG. 2 will be briefly described.

  FIG. 5 is a block diagram of an image data transfer apparatus provided in the sub-terminals 209 and 210. The difference from the block diagram of the image data transfer device provided in the main terminal shown in FIG. 3 is that it is not connected to the DVD device 1 and the navigation device 2 via the bus 26, and from the external input device (touch panel) 24. The input command data g11 is transmitted to the data processing unit 7, and the frequency cancellation control switch 14 is not provided, and other identical or corresponding components are denoted by the same reference numerals as those in FIG. Yes.

  Next, an operation example of image data transfer via the in-vehicle network 207 shown in FIG. 2 will be described with reference to FIGS. Although not clearly shown in FIG. 2, the release signal generation unit 15 of the main terminal 208 and the release signal generation unit 15 of the sub-terminals 209 and 210 are connected, and all the release signal generation units 15 release a single frequency control. Simultaneously operated by a switch.

  Also, as a premise for explanation, sub-terminal 1 (209) requests navigation map image data from navigation device 2, and sub-terminal 2 (210) requests device operation image data from DVD device 1, Assume that the vehicle is operating at high speed.

  In FIG. 2, sub-terminal 1 (209) requests map image data for navigation, and sub-terminal 2 (210) requests device operation image data. Correspondingly, the device operation image data g7 from the DVD device 1 and the navigation map image data g8 from the navigation device 2 are transferred to the image data transfer management unit 8 at the main terminal shown in FIG. Here, the navigation map image data g8 is the above-described high-speed image data, and the device operation image data g7 is the above-described low-speed image data. The image data transfer management unit 8 transmits to the transfer frequency calculation unit 9 a type transfer request signal S1 corresponding to the type of each image data g7, g8.

  The transfer frequency calculation unit 9 transfers to the image data transfer management unit 8 so that the transfer frequency of the navigation map image data g8, which is high-speed image data, is increased according to the type transfer request signal S1 and the vehicle speed data S2. Command signal S4 is transmitted.

  The image data transfer management unit 8 encodes each image data according to the transfer command signal S4 and transfers the encoded image data to the data transfer unit 20.

  Each image data transferred to the data transfer unit 20 is subjected to transfer frequency calculation control during high-speed operation. For this reason, the frequency of the image data transferred from the image data transfer management unit 8 to the data storage unit (FIFO) 16 is higher in the navigation map image data than in the above-described device operation image data. Then, the image data g4 transferred to the data storage unit (FIFO) is transferred to the packet processing unit in the transfer order (g3). The packet processing unit 17 sequentially processes input image data (g3), and the generated packet is transmitted as packet data g2 from the 1394 interfaces 18 and 19 through the in-vehicle network 207 to the subterminal 1 (209) and the subterminal. 2 (210).

  In the subterminal shown in FIG. 5, the data transfer unit 20 receives the packet via the in-vehicle network 207, combines the packets, and transfers them as image data to the image data transfer management unit 8.

  Then, the image data transfer management unit 8 decodes the image data requested by each of the sub terminals 209 and 210, and transfers it to the image output device 23 (g9). Then, the image is displayed on the monitor (25).

  As described above, the navigation map image is displayed in the sub-terminal 1 (209), and the DVD device operation image is displayed in the sub-terminal 2 (210). In addition, since frequency calculation control assuming high-speed driving was performed, the amount of information of each image data transferred from the main terminal (208) is larger in the map image data for navigation than in the device operation image data. .

  Next, an example of device command data transfer will be described. In FIG. 2, the multimedia equipment provided in the main terminal 208 is operated from the sub-terminals 209 and 210.

  For example, when the DVD device 1 of the main terminal 208 is operated from the touch panel 24 of the sub terminal 1 (209), the device operation image data displayed on the monitor of the sub terminal 1 (209) upon request is the transfer frequency as described above. The calculation is controlled and transferred from the DVD device 1 to the sub-terminal 1 (209) via the in-vehicle network 207. Therefore, simultaneously with the transfer of the device operation image data, the device control command or the device operation command table for operating the DVD device 1 from the DVD device 1 is transferred in the same manner as the image data, and the internal memory of the sub terminal 1 (209) Resident to As a result, device command data for controlling the DVD device 1 can be transferred from the sub-terminal.

  In FIG. 5, device command data g11 input from the external input device (touch panel) 24 of the sub-terminal is transmitted to the image data transfer management unit 8, and transfer frequency calculation control according to the vehicle speed is performed in the same manner as the device operation image data described above. Thus, the image data is transferred to the image data transfer management unit 8 of the main terminal in FIG. 3, and is transmitted to the DVD device 1 (g7). Then, the DVD device 1 performs processing according to the device command data g7, and the DVD device 1 newly transfers device operation image data to the sub terminal 1 (209) according to the transfer frequency as necessary.

  The above-described image data transfer operation has been described on the assumption that the high-speed operation is basically performed. However, the image data transfer operation during the low-speed operation shows the transfer frequency of the high-speed image data and the low-speed image data as shown in FIG. It only changes like this.

  According to the first embodiment, the transfer bandwidth of the in-vehicle network 207 can be effectively utilized by performing transfer frequency calculation control corresponding to the speed of the own vehicle for various image data.

  In the case where navigation information is displayed on the monitor 25 of the main terminal 208 in FIG. 3, the navigation map image data g8 transferred from the navigation device 2 to the image data transfer management unit 8 in response to the request is the transfer frequency described above. The calculation is performed and transferred to the image output device 23 according to the transfer frequency (g9). The navigation map image data g9 transferred to the image output device 23 is repeatedly displayed on the monitor 25 according to the operating frequency of the image output device 25 (g10). For example, when the transfer frequency to the image output device 25 is once per second, the image output device 25 displays the same image on the monitor 25 30 times per second.

[Second Embodiment]
FIG. 6 is a schematic diagram of an in-vehicle network configuration for explaining the second embodiment. And the main terminal 208 is not used for the apparatus which comprises the said vehicle-mounted network. Then, the DVD device 1 and the navigation device 2 included in the main terminal 208 described above are made independent as optional devices, and each optional device individually transfers image data to the in-vehicle network 207. The in-vehicle network shown in FIG. 6 includes sub terminals 61 and 65 and optional devices 62, 63, and 64. Further, although not explicitly shown in FIG. 6, each device includes a release signal generation unit 15, which are connected and can control all the release signal generation units 15 simultaneously. Further, each device obtains vehicle speed data S2 from the vehicle speed sensor unit 12 in order to perform transfer frequency calculation control.

  Here, the image data transfer operation in the optional device will be briefly described.

  FIG. 7 is a block diagram of an image data transfer device provided in an optional device including a navigation device. The difference from FIG. 5 is that there is no direct operation by an external input device (touch panel) and that a navigation device 30 is attached, and other identical or corresponding components are denoted by the same reference numerals. Yes.

  Briefly explaining the operation, for example, the navigation map image g12 output by the navigation device 30 shown in FIG. 7 according to the device command data (g12) transferred via the in-vehicle network 207 is an image data transfer management unit. 8, undergoes a transfer frequency calculation process, is transferred to the data transfer unit 20, and is transferred to each connected device via the in-vehicle network 207.

  In the main terminal including the DVD device 1 and the navigation device 2 described above, image data generated by the two devices is transferred and managed by one control unit 11. However, the image data g12 transferred from the optional device 62 including the navigation device 30 to the in-vehicle network 207 is only device-specific image data. Therefore, the image data transfer processing can be distributed by configuring each device included in the main terminal as an optional device.

  Next, the image data transfer operation of the optional device will be briefly described with reference to FIGS. When the sub terminal 61 requests the map image data for navigation from the option device 62 and is operating at high speed, the map image data for navigation from the option device 62 including the navigation device 30 is image data for high speed. Therefore, it is transferred to the in-vehicle network 207 with a high transfer frequency. The navigation map image data transferred to the sub terminal 61 is output to the monitor of the sub terminal 61 by the same processing as described above.

  When the navigation device 30 is operated from the sub terminal 61, the command data transferred from the sub terminal 61 is processed in the same manner as the image data as described above and transferred to the navigation device 30 in FIG. 7 (g12).

  Here, in FIG. 6, the optional devices 63 and 64 having the DVD device 31 and the camera device 32 are the optional device 62 having the navigation device 30 described above in that image data is generated and transferred to the in-vehicle network 207. The same treatment is possible. That is, each option device 62, 63, 64 changes the transfer frequency of the image data to the in-vehicle network 207 according to the vehicle speed.

  For example, during high-speed driving, the map data for navigation output from the navigation device 62 and the camera device 64 are output in the image data transferred from the optional devices 62, 63, 64 to the in-vehicle network 207 as required. The monitoring monitor image data transfer frequency is high, and the device operation image data output frequency from each optional device 62, 63, 64 is lower.

  Conversely, during low-speed driving, the transfer frequency of the map image data for navigation output from the navigation device 62 and the monitoring monitor image data output from the camera device 64 is low, and is output from each optional device 62, 63, 64. The transfer frequency of the device operation image data is higher than that.

  According to the second embodiment, the transfer frequency calculation process is distributed, and in addition to the effective use of the transfer band of the in-vehicle network 207 by the frequency calculation control, the transfer process is faster than the in-vehicle network configuration having the main terminal. Is made.

[Third embodiment]
In the third embodiment, by dividing the vehicle speed into a plurality of ranges and setting the transfer frequency corresponding to each range, the transfer frequency of each image data is stepwise according to the range to which the vehicle speed belongs. To change.

  FIG. 8 is a chart showing changes in transfer frequency of each image data according to the vehicle speed. As described above, the high-speed image data is the navigation map image data and the monitoring monitor image data, and the low-speed image data is the navigation operation image data and the device operation image data.

  In Table 1, frequency control is not performed with a vehicle speed of 40 km / h or more and less than 60 km / h as the standard operation speed, and the image data transfer frequency for high speed is reduced by 25% at a vehicle speed of 20 km / h or more and less than 40 km / h, and image data transfer for low speed Increase frequency by 25%. Then, at a vehicle speed of less than 20 km / h, the high-speed image data transfer frequency is reduced by 50%, and the low-speed image data transfer frequency is increased by 50%. Conversely, at a vehicle speed of 60 km / h or more and less than 80 km / h, the high-speed image data transfer frequency is increased by 25%, and the low-speed image data transfer frequency is decreased by 25%. At 80 km / h or higher, the high-speed image data transfer frequency is increased by 50%, and the low-speed image data transfer frequency is decreased by 50%.

  Instead of setting the transfer frequency based on the classification of the high-speed image data and the low-speed image data, a transfer frequency corresponding to the vehicle speed may be set for each type of image data.

  According to the third embodiment, it is possible to speed up image data transfer by frequency calculation control by calculating the transfer frequency for each image data only when the range to which the vehicle speed belongs changes and reducing the amount of calculation. .

[Fourth embodiment]
In the fourth embodiment, the transfer frequency of each image data is calculated at predetermined time intervals. For example, the transfer frequency is calculated every second.

  While driving at constant speed, it is unlikely that the vehicle speed will suddenly change in a predetermined short time. Therefore, after calculating the transfer frequency according to the type of image data and the vehicle speed, the transfer frequency is not calculated within the predetermined time, and each image data is transferred while maintaining the calculated frequency. The time interval for calculating the transfer frequency may be changed according to the traveling situation generated by the vehicle speed sensor described above. For example, during acceleration with a large speed change, the time interval for calculating the transfer frequency is shortened.

  By calculating the transfer frequency for each image data at a predetermined time interval and reducing the amount of calculation, it is possible to speed up image data transfer by frequency calculation control.

  The above embodiment is summarized as follows.

(Appendix 1)
In the in-vehicle image transfer device provided in the image data generation device in the in-vehicle network system that connects the image data generation device and the image display device via a network,
The transfer frequency of the image data is changed according to the type of image data generated by the image data generation device and the vehicle speed generated by the vehicle speed sensor, and the image data is transferred to the image via the network according to the transfer frequency. An in-vehicle image transfer device that transfers to a display device.

(Appendix 2)
The in-vehicle image transfer device is
When the vehicle speed is the first speed,
If the image data is first image data, the transfer frequency is the first transfer frequency,
If the image data is second image data, the transfer frequency is a second transfer frequency higher than the first transfer frequency,
The vehicle speed is a second speed faster than the first speed,
If the image data is first image data, the transfer frequency is the third transfer frequency,
The in-vehicle image transfer apparatus according to appendix 1, wherein when the image data is second image data, the transfer frequency is a fourth transfer frequency lower than the third transfer frequency.

(Appendix 3)
The in-vehicle image transfer apparatus according to appendix 2, wherein the third transfer frequency is higher than the first transfer frequency, and the second transfer frequency is higher than the fourth transfer frequency.
(Appendix 4)
The image data generation device has at least one of a car navigation device or a monitoring monitor device,
The second image data is device operation image data for operating the image data generation device, and the first image data is generated by the map image data generated by the car navigation device or the monitoring monitor device. The image processing apparatus according to appendix 2 or 3, which is monitoring monitor image data to be recorded.

(Appendix 5)
The in-vehicle image transfer apparatus according to appendix 1, wherein the transfer frequency is a transfer allocation time.

(Appendix 6)
The in-vehicle image transfer apparatus according to appendix 1, wherein the transfer frequency is a transfer order.

(Appendix 7)
2. The in-vehicle image transfer apparatus according to appendix 1, wherein the vehicle speed sensor detects a travel situation in addition to the vehicle speed, and the transfer frequency changes according to the travel situation.

(Appendix 8)
The vehicle speed is divided into a plurality of vehicle speed ranges,
The in-vehicle image transfer apparatus according to appendix 1, wherein the transfer frequency is changed every time a vehicle speed range to which the vehicle speed belongs changes.
(Appendix 9)
The in-vehicle image transfer apparatus according to appendix 1, wherein the transfer frequency is obtained every predetermined time interval.

(Appendix 10)
The in-vehicle image transfer device according to appendix 1, further comprising an external switch that stops transfer according to the transfer frequency.

FIG. 1 is an example of an in-vehicle network. FIG. 2 is a schematic diagram of an in-vehicle network configuration for explaining the first embodiment. FIG. 3 is a block diagram of the image data transfer device provided in the main terminal according to the first embodiment. FIG. 4 is an example of a transfer packet form in the first embodiment. FIG. 5 is a block diagram of an image data transfer apparatus provided in the sub-terminal. FIG. 6 is a schematic diagram of an in-vehicle network configuration for explaining the second embodiment. FIG. 7 is a block diagram of an image data transfer device provided in an optional device including a navigation device. FIG. 8 is a chart showing changes in transfer frequency of each image data according to the vehicle speed.

Explanation of symbols

208 Main terminal
209 210 Subterminal
11 Control unit
5 ENCORDER
6 DECORDER
7 Data processing unit
8 Image data transfer manager
9 Transfer frequency calculation unit
10 Frequency calculator
12 Vehicle speed sensor unit
13 Frequency controller
18 19 1394I / F
20 Data transfer unit
23 Image output device
24 External input device (touch panel)
25 Monitor

Claims (8)

In the in-vehicle image transfer device provided in the image data generation device in the in-vehicle network system that connects the image data generation device and the image display device via a network,
The transfer frequency of the image data is changed according to the type of image data generated by the image data generation device and the vehicle speed generated by the vehicle speed sensor, and the image data is transferred to the image via the network according to the transfer frequency. An in-vehicle image transfer device that transfers to a display device. The in-vehicle image transfer device is
When the vehicle speed is the first speed,
If the image data is first image data, the transfer frequency is the first transfer frequency,
If the image data is second image data, the transfer frequency is a second transfer frequency higher than the first transfer frequency,
The vehicle speed is a second speed faster than the first speed,
If the image data is first image data, the transfer frequency is the third transfer frequency,
2. The in-vehicle image transfer apparatus according to claim 1, wherein when the image data is second image data, the transfer frequency is set to a fourth transfer frequency lower than the third transfer frequency.   3. The in-vehicle image transfer apparatus according to claim 2, wherein the third transfer frequency is higher than the first transfer frequency, and the second transfer frequency is higher than the fourth transfer frequency. The image data generation device has at least one of a car navigation device or a monitoring monitor device,
The second image data is device operation image data for operating the image data generation device, and the first image data is generated by the map image data generated by the car navigation device or the monitoring monitor device. 4. The image processing device according to claim 2, wherein the image data is monitoring monitor image data.   2. The in-vehicle image transfer apparatus according to claim 1, wherein the transfer frequency is a transfer allocation time.   2. The in-vehicle image transfer apparatus according to claim 1, wherein the transfer frequency is a transfer order.   2. The in-vehicle image transfer apparatus according to claim 1, wherein the vehicle speed sensor detects a travel situation in addition to the vehicle speed, and the transfer frequency changes according to the travel situation. The vehicle speed is divided into a plurality of vehicle speed ranges,
2. The in-vehicle image transfer apparatus according to claim 1, wherein the transfer frequency is changed every time a vehicle speed range to which the vehicle speed belongs changes.

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