CN110913125A - Synchronous communication method for multiple wireless cameras and vehicle panoramic system - Google Patents
Synchronous communication method for multiple wireless cameras and vehicle panoramic system Download PDFInfo
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- CN110913125A CN110913125A CN201911033503.8A CN201911033503A CN110913125A CN 110913125 A CN110913125 A CN 110913125A CN 201911033503 A CN201911033503 A CN 201911033503A CN 110913125 A CN110913125 A CN 110913125A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/66—Remote control of cameras or camera parts, e.g. by remote control devices
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- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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Abstract
The application relates to a method for synchronous communication of a plurality of wireless cameras and a vehicle panoramic system, which are applied to the vehicle panoramic system provided with a wireless controller and a plurality of wireless cameras, and the method comprises the following steps: dividing a communication channel of the wireless controller into a plurality of sub-channels; the wireless cameras are respectively in communication connection with different sub-channels on the wireless controller through self-adaptive frequency hopping; and processing signals transmitted by the plurality of wireless cameras. The beneficial effects are that: according to the method, the communication channel of the wireless controller is divided into different sub-channels, so that the plurality of cameras select the idle sub-channels to access through self-adaptive frequency hopping, the plurality of wireless cameras are synchronously connected with the wireless controller at the same time, and the phenomenon that different cameras adopt the same channel to communicate with the same controller to generate signal interference is effectively avoided; meanwhile, a connecting wire harness of a camera is omitted, the installation of the system is simplified, and compared with the background technology, the cost is lower.
Description
Technical Field
The application relates to the technical field of automotive electronics, in particular to a method for synchronous communication of a plurality of wireless cameras and a vehicle panoramic system.
Background
The application of the existing 360-degree panoramic image system to medium-high-grade vehicles is very common, four cameras are respectively arranged on the front, the back, the left and the right of a vehicle body, and a complete top view is formed by an image seamless splicing technology. The automobile parking assisting device can help automobile drivers park vehicles more intuitively and safely. However, the four cameras of the existing 360-degree panoramic image system are all connected in a wired mode, wiring harnesses are arranged in an automobile body, the electromagnetic environment of the automobile body is complex, interference cannot be avoided sometimes, and the user experience is affected due to the fact that stripes and other images appear in images. The wire harness on the other hand also increases the complexity of wiring in the vehicle and increases the manufacturing cost.
Disclosure of Invention
In order to solve the above technical problem, the present application provides a method for synchronous communication of multiple wireless cameras, which is applied to a vehicle panoramic system provided with a wireless controller and multiple wireless cameras, and the method includes:
dividing a communication channel of the wireless controller into a plurality of sub-channels;
the wireless cameras are respectively in communication connection with different sub-channels on the wireless controller through self-adaptive frequency hopping;
and processing signals transmitted by the plurality of wireless cameras.
Optionally, the dividing the communication channel of the wireless controller into a plurality of sub-channels includes:
and dividing the communication channel into a plurality of sub-channels with equal bandwidth, wherein the center frequency point interval of two adjacent sub-channels is a preset interval.
Optionally, the number of the subchannels is 14.
Optionally, the connecting the plurality of wireless cameras with different sub-channels on the wireless controller through adaptive frequency hopping respectively includes:
after the wireless camera detects a matching response event, broadcasting a request frame to a preset channel list on the wireless controller;
after the wireless controller detects the request frame from the wireless camera, feeding back a response message;
and the wireless camera selects an idle sub-channel of the wireless controller to send an image signal packet according to the response message.
Optionally, the matching response event comprises one or more of vehicle ignition, key input.
Optionally, the response packet is a data packet containing a channel occupation status of the response packet.
Optionally, the processing the signals transmitted from the plurality of wireless cameras includes:
according to the image signal packet transmitted by each wireless camera, deserializing to generate a first image signal;
splicing the first image signals of the plurality of wireless cameras to generate a second image signal;
transcoding the second image signal to generate an LVDS signal for display by the display.
In addition, the application also provides a vehicle panoramic system, which comprises the synchronous communication method of the plurality of wireless cameras, the system also comprises a wireless controller and a plurality of wireless cameras which are in communication connection with the wireless controller, wherein,
the wireless cameras are respectively arranged on the outer side of the vehicle and used for acquiring image signal packets around the vehicle;
the wireless controller is integrated in the vehicle central controller and used for receiving the image signal packets transmitted by the cameras and splicing and transcoding the image signal packets of the multiple wireless cameras to generate LVDS signals for display of the display;
the system is used for: dividing a communication channel of the wireless controller into a plurality of sub-channels; the wireless cameras are respectively in communication connection with different sub-channels on the wireless controller through self-adaptive frequency hopping; and processing signals transmitted by the plurality of wireless cameras.
Optionally, the plurality of wireless cameras are connected to the wireless controller through WIFI.
Optionally, the wireless controller includes a deserializer, a graphic signal processor, and a serializer, wherein input ends of the deserializers are respectively connected to different sub-channels of the wireless controller, output ends of the deserializers are all connected to different input ends of the graphic signal processor, an output end of the graphic signal processor is connected to an input end of the serializer, and an output end of the serializer is connected to an external display;
the wireless controller is to: receiving the image signal packet transmitted by each wireless camera through different sub-channels, deserializing the image signal packet by the deserializer to generate a first image signal, and transmitting the first image signal to the image signal processor; the image signal processor generates a second image signal from the first image signals of the plurality of wireless cameras, and sends the second image signal to a serializer for encoding to generate an LVDS signal for display, so as to be displayed by an external display.
The application discloses a method for synchronous communication of a plurality of wireless cameras and a vehicle panoramic system, which has the beneficial effects that: according to the method, the communication channel of the wireless controller is divided into different sub-channels, so that the plurality of cameras select the idle sub-channels to access through self-adaptive frequency hopping, the plurality of wireless cameras are synchronously connected with the wireless controller at the same time, and the phenomenon that different cameras adopt the same channel to communicate with the same controller to generate signal interference is effectively avoided; meanwhile, a connecting wire harness of a camera is omitted, the installation of the system is simplified, and compared with the background technology, the cost is lower.
Drawings
Fig. 1 is a flowchart of a method for synchronous communication among a plurality of wireless cameras according to an embodiment of the present disclosure;
FIG. 2 is a flowchart of step 200 of FIG. 1 according to an embodiment of the present disclosure;
FIG. 3 is a flowchart of step 300 of FIG. 2 according to an embodiment of the present application;
FIG. 4 is a schematic structural diagram of a wireless controller according to an embodiment of the present application;
FIG. 5 is a schematic view of a camera head according to an embodiment of the present disclosure;
fig. 6 is a schematic diagram of subchannel division according to an embodiment of the present application.
Detailed Description
The following detailed description of the preferred embodiments of the present application, taken in conjunction with the accompanying drawings, will make the advantages and features of the present application more readily appreciated by those skilled in the art, and thus will more clearly define the scope of the invention.
In an embodiment shown in fig. 1-6, the present application provides a method for synchronous communication among multiple wireless cameras, applied to a vehicle panoramic system provided with a wireless controller and multiple wireless cameras, and referring to fig. 1, the method includes:
100, dividing a communication channel of a wireless controller into a plurality of sub-channels;
in step 100, the communication channel is divided into a plurality of sub-channels, and the center frequency point interval between two adjacent sub-channels is a preset interval. In one implementation manner of this embodiment, the wireless controller and the wireless camera adopt IEEE 802.11b/G wireless communication, and the standard thereof works in a 2.4G frequency band, and the frequency range is 2.400 to 2.4835GHz, which is 83.5M bandwidth in total; in this embodiment, the preset interval is 5MHz, a communication channel between the wireless controller and the wireless camera is divided into 14 sub-channels, each sub-channel has a bandwidth of 22MHz, and a plurality of adjacent signals have frequency overlapping; see fig. 6.
200, connecting a plurality of wireless cameras with different sub-channels on a wireless controller respectively through self-adaptive frequency hopping;
in step 200, the method for connecting multiple wireless cameras to different sub-channels on a wireless controller in a communication manner through adaptive frequency hopping includes: 210, after detecting the matching response event, the wireless camera broadcasts a request frame to a preset channel list on the wireless controller; 220, after detecting the request frame from the wireless camera, the wireless controller feeds back a response message; and 230, the wireless camera selects an idle sub-channel of the wireless controller to send the image signal packet according to the response message. The communication channel of the wireless controller is divided into different sub-channels, so that the plurality of cameras select idle sub-channels to access through self-adaptive frequency hopping, the plurality of wireless cameras are synchronously connected with the wireless controller at the same time, and the problem that different cameras adopt the same channel to communicate with the same controller to generate signal interference is effectively avoided.
And 300, processing signals transmitted by the plurality of wireless cameras.
In step 300, 310, according to the image signal packet transmitted by each wireless camera, deserializing to generate a first image signal; 320, splicing the first image signals of the plurality of wireless cameras to generate a second image signal; and 330, transcoding the second image signal to generate an LVDS signal for display of the display. In an implementation manner of this embodiment, referring to fig. 4, image signal packets of four wireless cameras enter the controller through four different channels, and the four wireless image signal packets do not interfere with each other. The four receiving ends respectively receive the image signal packets, deserialize the image signal packets into a first image signal through the deserializer, and send the first image signal to the image processing chip through a BT656 transmission mode. The image processing chip performs fusion splicing on the plurality of first image signals to generate a second image signal, and then the second image signal is converted into an LVDS signal through the serializer and transmitted to the display for displaying. In this embodiment, the transmission distance between the wireless controller and the transceiver module of the wireless camera can reach 200 meters, and the wireless controller and the transceiver module of the wireless camera can bypass obstacles. The receiving and transmitting module is a WIFI receiving and transmitting module, the deserializer is a DS90UB934-Q1 deserializer, and the serializer is a DS90UB925Q-Q1 serializer.
In some embodiments, dividing the communication channel of the wireless controller into a plurality of sub-channels includes: the equal bandwidth of a communication channel is divided into a plurality of sub-channels, and the interval of the central frequency points of two adjacent sub-channels is a preset interval. The number of subchannels is 14. In this embodiment, the communication channel is divided into a plurality of sub-channels, and the interval between the center frequency points of two adjacent sub-channels is a preset interval. In one implementation manner of this embodiment, the wireless controller and the wireless camera adopt IEEE 802.11b/G wireless communication, and the standard thereof works in a 2.4G frequency band, and the frequency range is 2.400 to 2.4835GHz, which is 83.5M bandwidth in total; in this embodiment, the preset interval is 5MHz, a communication channel between the wireless controller and the wireless camera is divided into 14 sub-channels, each sub-channel has a bandwidth of 22MHz, and a plurality of adjacent signals have frequency overlapping; see fig. 6.
In some embodiments, the connecting the plurality of wireless cameras with different sub-channels of the wireless controller respectively through adaptive frequency hopping includes: 210, after detecting the matching response event, the wireless camera broadcasts a request frame to a preset channel list on the wireless controller; 220, after detecting the request frame from the wireless camera, the wireless controller feeds back a response message; and 230, the wireless camera selects an idle sub-channel of the wireless controller to send the image signal packet according to the response message. The matching response event comprises one or more of vehicle ignition and key input. The response message is a data message containing the self channel occupation condition. In an implementation manner of this embodiment, the wireless camera is started by vehicle start or input in vehicle central control, and a receiving module of the wireless camera is used as an STA to automatically broadcast a request frame to a preset channel table on the wireless controller; the STA is a wireless terminal, the STA itself does not receive wireless access, and can be connected to the AP, and the general wireless network card operates in this mode. If a wireless controller, namely an AP node, exists in the STA search range, after the AP node detects an air packet access code, namely a request frame of a wireless camera, a response message with the channel occupation condition data of the wireless controller is fed back; the STA automatically selects an idle sub-channel according to the response message, i.e., according to the current channel occupation status.
In some implementations, processing signals from a plurality of wireless cameras includes: 310, according to the image signal packet transmitted by each wireless camera, deserializing to generate a first image signal; 320, splicing the first image signals of the plurality of wireless cameras to generate a second image signal; and 330, transcoding the second image signal to generate an LVDS signal for display of the display. In an implementation manner of this embodiment, referring to fig. 4, image signal packets of four wireless cameras enter the controller through four different channels, and the four wireless image signal packets do not interfere with each other. The four receiving ends respectively receive the image signal packets, deserialize the image signal packets into a first image signal through the deserializer, and send the first image signal to the image processing chip through a BT656 transmission mode. The image processing chip performs fusion splicing on the plurality of first image signals to generate a second image signal, and then the second image signal is converted into an LVDS signal through the serializer and transmitted to the display for displaying. In this embodiment, the transmission distance between the wireless controller and the transceiver module of the wireless camera can reach 200 meters, and the wireless controller and the transceiver module of the wireless camera can bypass obstacles. The receiving and transmitting module is a WIFI receiving and transmitting module, the deserializer is a DS90UB934-Q1 deserializer, and the serializer is a DS90UB925Q-Q1 serializer.
In another implementation, the present application further provides a vehicle panoramic system, which includes a method for synchronous communication of multiple wireless cameras as described above, the system further includes a wireless controller, and multiple wireless cameras communicatively connected to the wireless controller, wherein,
the wireless cameras are respectively arranged on the outer side of the vehicle and used for acquiring image signal packets around the vehicle;
in an implementation manner of this embodiment, the number of the wireless cameras is 4, and the wireless cameras are respectively distributed around the front, the back, the left, and the right of the automobile, referring to fig. 5, by acquiring image signal packets of 4 paths around the automobile, a complete top view is formed after splicing.
The wireless controller is integrated in the vehicle central controller and used for receiving the image signal packets transmitted by the cameras and splicing and transcoding the image signal packets of the multiple wireless cameras to generate LVDS signals for display of the display;
in an implementation manner of this embodiment, the wireless controller includes a deserializer, a graphic signal processor, and a serializer, wherein input ends of the deserializers are respectively connected to different sub-channels of the wireless controller, output ends of the deserializers are all connected to different input ends of the graphic signal processor, an output end of the graphic signal processor is connected to an input end of the serializer, and an output end of the serializer is connected to an external display;
the system is used for: dividing a communication channel of a wireless controller into a plurality of sub-channels; a plurality of wireless cameras are respectively in communication connection with different sub-channels on a wireless controller through self-adaptive frequency hopping; and processing signals transmitted by the plurality of wireless cameras.
In some embodiments, a plurality of wireless cameras are connected with the wireless controller through WIFI. The WI-FI is a brand of wireless network communication technology, and is held by a WI-FI alliance, and the WI-FI comprises a basic service unit, a distribution system, an access point, an extended service unit, a gateway and the like. The object is to improve the interoperability between wireless network products based on the IEEE 802.11 standard.
In some embodiments, the wireless controller comprises a deserializer, a graphic signal processor, and a serializer, wherein the input ends of the deserializers are respectively connected with different sub-channels of the wireless controller, the output ends of the deserializers are connected with different input ends of the graphic signal processor, the output end of the graphic signal processor is connected with the input end of the serializer, and the output end of the serializer is connected with the external display; the wireless controller and the wireless camera adopt IEEE 802.11b/G wireless communication, the standard works in a 2.4G frequency band, the frequency range is 2.400-2.4835 GHz, and the total bandwidth is 83.5M; in this embodiment, the preset interval is 5MHz, a communication channel between the wireless controller and the wireless camera is divided into 14 sub-channels, each sub-channel has a bandwidth of 22MHz, and a plurality of adjacent signals have frequency overlapping; see fig. 6.
This wireless controller is used for: receiving image signal packets transmitted by each wireless camera through different sub-channels, deserializing the image signal packets by a deserializer to generate first image signals, and transmitting the first image signals to an image signal processor; the image signal processor generates a second image signal from the first image signals of the plurality of wireless cameras, and sends the second image signal to the serializer for encoding to generate an LVDS signal for display for an external display. In this embodiment, the transmission distance between the wireless controller and the transceiver module of the wireless camera can reach 200 meters, and the wireless controller and the transceiver module of the wireless camera can bypass obstacles. The receiving and transmitting module is a WIFI receiving and transmitting module, the deserializer is a DS90UB934-Q1 deserializer, and the serializer is a DS90UB925Q-Q1 serializer.
According to the method for synchronous communication of the multiple wireless cameras and the vehicle panoramic system, the communication channel of the wireless controller is divided into different sub-channels, so that the multiple cameras select idle sub-channels to access through self-adaptive frequency hopping, the multiple wireless cameras are synchronously connected with the wireless controller at the same time, and the situation that the different cameras adopt the same channel to communicate with the same controller to generate signal interference is effectively avoided; meanwhile, a connecting wire harness of a camera is omitted, the installation of the system is simplified, and compared with the background technology, the cost is lower.
The embodiments of the present application have been described in detail with reference to the drawings, but the present application is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present application within the knowledge of those skilled in the art.
Claims (10)
1. A method for synchronous communication of a plurality of wireless cameras is applied to a vehicle panoramic system provided with a wireless controller and a plurality of wireless cameras, and comprises the following steps:
dividing a communication channel of the wireless controller into a plurality of sub-channels;
the wireless cameras are respectively in communication connection with different sub-channels on the wireless controller through self-adaptive frequency hopping;
and processing signals transmitted by the plurality of wireless cameras.
2. The method according to claim 1, wherein the dividing the communication channel of the wireless controller into a plurality of sub-channels comprises:
and dividing the communication channel into a plurality of sub-channels with equal bandwidth, wherein the center frequency point interval of two adjacent sub-channels is a preset interval.
3. The method as claimed in claim 2, wherein the number of the sub-channels is 14.
4. The method according to claim 1, wherein the communicatively connecting a plurality of wireless cameras with different sub-channels of the wireless controller respectively through adaptive frequency hopping comprises:
after the wireless camera detects a matching response event, broadcasting a request frame to a preset channel list on the wireless controller;
after the wireless controller detects the request frame from the wireless camera, feeding back a response message;
and the wireless camera selects an idle sub-channel of the wireless controller to send an image signal packet according to the response message.
5. The method of claim 4, wherein the matching response event comprises one or more of vehicle ignition, key input, etc.
6. The method according to claim 4, wherein the response message is a data message containing its own channel occupation status.
7. The method according to claim 4, wherein the processing the signals from the plurality of wireless cameras comprises:
according to the image signal packet transmitted by each wireless camera, deserializing to generate a first image signal;
splicing the first image signals of the plurality of wireless cameras to generate a second image signal;
transcoding the second image signal to generate an LVDS signal for display by the display.
8. A vehicle panorama system comprising a plurality of wireless cameras according to any of claims 1-7, the system further comprising a wireless controller, and a plurality of wireless cameras communicatively coupled to the wireless controller,
the wireless cameras are respectively arranged on the outer side of the vehicle and used for acquiring image signal packets around the vehicle;
the wireless controller is integrated in the vehicle central controller and used for receiving the image signal packets transmitted by the cameras and splicing and transcoding the image signal packets of the multiple wireless cameras to generate LVDS signals for display of the display;
the system is used for: dividing a communication channel of the wireless controller into a plurality of sub-channels; the wireless cameras are respectively in communication connection with different sub-channels on the wireless controller through self-adaptive frequency hopping; and processing signals transmitted by the plurality of wireless cameras.
9. The vehicle panorama system of claim 8, wherein a plurality of said wireless cameras are connected to said wireless controller via WIFI.
10. The vehicle panorama system of claim 8, wherein said wireless controller comprises a deserializer, a graphic signal processor, and a serializer, wherein a plurality of inputs of said deserializer are connected to different sub-channels of said wireless controller, respectively, and wherein a plurality of outputs of said deserializer are connected to different inputs of said graphic signal processor, wherein an output of said graphic signal processor is connected to an input of said serializer, and wherein an output of said serializer is connected to an external display;
the wireless controller is to: receiving the image signal packet transmitted by each wireless camera through different sub-channels, deserializing the image signal packet by the deserializer to generate a first image signal, and transmitting the first image signal to the image signal processor; the image signal processor generates a second image signal from the first image signals of the plurality of wireless cameras, and sends the second image signal to a serializer for encoding to generate an LVDS signal for display, so as to be displayed by an external display.
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Application publication date: 20200324 Assignee: Shenzhen Dechi micro vision technology Co.,Ltd. Assignor: SHENZHEN DESAY MICROELECTRONIC TECHNOLOGY Co.,Ltd. Contract record no.: X2020980002081 Denomination of invention: Synchronous communication method for multiple wireless cameras and vehicle panoramic system License type: Exclusive License Record date: 20200509 |
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Application publication date: 20200324 |