CN105978742A - Transmission method for onboard image data - Google Patents
Transmission method for onboard image data Download PDFInfo
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- CN105978742A CN105978742A CN201610571487.8A CN201610571487A CN105978742A CN 105978742 A CN105978742 A CN 105978742A CN 201610571487 A CN201610571487 A CN 201610571487A CN 105978742 A CN105978742 A CN 105978742A
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- node
- route
- link
- energy consumption
- routing
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/02—Topology update or discovery
- H04L45/021—Ensuring consistency of routing table updates, e.g. by using epoch numbers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/70—Routing based on monitoring results
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/74—Address processing for routing
- H04L45/742—Route cache; Operation thereof
Abstract
The present invention provides a transmission method for onboard image data. The method comprises: a node sets a route to a target node by receiving a response; a local repair function is invoked to conduct route interrupt repair; the node sends heartbeat packets to neighbor nodes at regular times, clears interrupted neighbor nodes and clears interrupted routes, detects a routing table at regular times, and clears timed out routing entries in the routing table; an energy consumption threshold and a received signal strength threshold are set for onboard nodes; if a certain node in a link reaches the thresholds, a source node is notified of the risk from the target node, and if no interrupt risk in link exists in a new link, a newly added route is used. The present invention proposes a transmission method for onboard image data, which optimizes media collection and transmission according the characteristics of onboard systems and distribution network communications, thereby improving the overall performance of onboard media transmission.
Description
Technical field
The present invention relates to car networking, particularly to a kind of vehicle-mounted image data transfer method.
Background technology
Vehicle mounted electric line of force communication network be intelligent transportation realizes vehicle multimedia transmission, remote traffic accident pre-
The basis of the application technologies such as police.The application of vehicle mounted electric line of force communication network is the most simply at safety, the car of vehicle
The field such as flow management, monitoring, under real road environment, owing to fast running can cause topological structure dynamic
Change, simultaneously power line carrier signal be also faced with electromagnetic interference influence cause communication quality reduce even interrupt,
The most existing vehicle mounted electric line of force communication network is difficult to the media transmission of stability and high efficiency.
Summary of the invention
For solving the problem existing for above-mentioned prior art, the present invention proposes the transmission of a kind of vehicle-mounted view data
Method, including:
Each node is responded by reception, arranges the route of destination node；When a route occurs to interrupt,
Route is called local repair function and is carried out route repair；The timing of each node sends heartbeat packet to neighbor node,
Remove the neighbor node interrupted and remove the route interrupted, route-caching intervalometer timing detection routing table, and
Time remove the route entry of time-out in routing table, realize the vehicle-mounted matchmaker of electrically-based line communication with current routing table
Body transmits；
Respectively set energy consumption and the received signal strength threshold value of vehicle-mounted node；If certain node in link
Reach threshold value, sent notice from destination node to opposite direction, risk is notified source node, such as new link
Do not deposit disruption risk in a link, then use the route being newly added；
The most internodal signal receiving strength is calculated as:
G=PcHcHrlclr/s3k
The signal intensity that its interior joint receives is g；PcFor signal transmission power；HcChain for sending node
Road gain；HrLink gain for receiving node；lcFor sending the length of link；lrLong for receiving node link
Degree, s is the spacing between two nodes；K is loss coefficient；
Size g of signal intensity judgment thresholdtIt is defined as:
gt=gn×t+g
T represents the time delay that cannot receive signal, gnIllustrate the node energy consumption when two adjacent signal receive
Successively decrease；
By controlling threshold range, when less than certain scope, select search new routing link and safeguard new
Routing link table；
The energy consumption calculation of its interior joint is:
Ut=(R × t)+U
U is the energy consumption maintaining basic communication；R is node energy consumption power；T is that energy consumption uses up the time, if passing through
Time be ts, DtRepresent t node energy consumption situation, then energy consumption power R can be expressed as R=(D(t-ts)-Dt)
/ts
By controlling UtThe threshold value of energy consumption avoids routing link to interrupt.
The present invention compared to existing technology, has the advantage that
The present invention proposes a kind of vehicle-mounted image data transfer method, the spy communicated according to onboard system with distribution
Point, is optimized acquisition of media and transmission, improves the overall performance of vehicle-mounted media transmission.
Accompanying drawing explanation
Fig. 1 is the flow chart of vehicle-mounted image data transfer method according to embodiments of the present invention.
Detailed description of the invention
Hereafter provide one or more embodiment of the present invention together with the accompanying drawing of the diagram principle of the invention is detailed
Thin description.Describe the present invention in conjunction with such embodiment, but the invention is not restricted to any embodiment.This
Bright scope is limited only by the appended claims, and the present invention contains many replacements, amendment and equivalent.?
Middle elaboration many detail is described below to provide thorough understanding of the present invention.For exemplary purposes
And these details are provided, and can also be according to right without some in these details or all details
Claim realizes the present invention.
An aspect of of the present present invention provides a kind of vehicle-mounted image data transfer method.Fig. 1 is real according to the present invention
Execute the vehicle-mounted image data transfer method flow chart of example.
Vehicle node has router and main frame dual identity, has operation as main frame and applies kimonos accordingly
The function of business；As router, have and safeguard routing table, determine the function of Route Selection.At vehicle power
Line communication network environment lower node has random movement, self-organizing, provisional feature, the therefore present invention couple
Power line communication network agreement is optimized.
The physical layer of vehicle mounted electric line of force communication network be responsible for the selection of frequency, the detection of carrier signal, modulation with
Demodulation, signal send and receive.Vehicle-mounted node uses based on OFDM agreement, arranges 64 secondary loads
Ripple, the channel of a width of 20MHz of each band is made up of 52 subcarriers in 64 subcarriers.Wherein 4
Subcarrier is as pilot tone, and to monitor frequency offset and phase bias, remaining 48 subcarrier is then for transmitting
Data.The header file of each physical layer data bag includes short sequence symbol and long sequence symbol, is used for doing signal
Detecting, frequency offset estimation, time synchronized and channel judge.Before being adjusted to carrier wave, information bit is used
Interlacing scan encodes.In order to carry out larger range of communication in the automotive environment, define the highest effectively etc.
It is 44dBm to radiant power, allows automobile process emergency to greatest extent.Network layer protocol monitoring network
The change of topological structure；Exchange routing iinformation；The position of the node determined；Produce, safeguard and cancel road
By；Select route and forward data.Routing Protocol includes route requests, route response and route maintenance.Association
View relies on four bags to realize: routing request packet, route response bag, and route interrupts bag and heartbeat packet.At net
In the case of network resource is sufficient, Routing Protocol safeguards route by periodic broadcasting heartbeat packet, once finds certain
One link disconnects, and node just sends erroneous packets notice, and because link disconnects, inaccessible knot removal is corresponding
Record or already present route is repaired.When source node sends packet to destination node, first
Find the route table items of destination node in the routing table, if it is found, be then transmitted by this route；No
Then, structure routing request packet carries out broadcasting the route searching out destination node.Other node is receiving route
After request bag, first determine whether oneself to be destination node；Secondly, search oneself routing table whether have to
The route entry of destination node, if had, sends respond packet to neighbor node, without then continuing to forward route requests
Bag.Each routing request packet arranges a max-forwards number of times, does not still have when exceeding this max-forwards number of times
There is the route finding destination node, then abandon this bag.When a node receives routing request packet, find certainly
When oneself is to have the route to this destination node in destination node or the routing table of oneself, then send respond packet.
Notice upstream node finds the route towards destination node.When node receives respond packet, initially set up
The route of destination node；Secondly, check whether oneself is source node, if then stopping forwarding response, otherwise
Continue transmitted response.When a route is interrupted, first start local routing reparation, if can not repair, then
Send route response bag to relevant node, notify that this route is interrupted.The timing of route-caching timer is by time-out
Route entry delete from routing table.Additionally, neighbor node timer also can the detection of fixed time broadcast heartbeat packet
The connectivity of neighbor node, removes the route interrupted.
Transport layer, for providing reliable end-to-end service to application layer, makes upper strata be isolated with communication subnet,
And use udp protocol to utilize Internet resources according to the characteristic of Internet.Application layer offer is user oriented respectively
Plant application service, including the transmission service of media data.
The handling process sending routing request packet is as follows:
First check whether local routing has to Target Link, if local routing table has to target circuit and
Can use, then be disposed；When arriving the time sending routing request packet, detection search routing times
Whether have arrived at number of times to limit, the most do not search destination node if reaching to limit, then delete packet,
It is disposed；If sending routing request packet for the first time, arranging searching threshold is initial value.If not
Once send broadcast packet, then expand the broadcasting area of bag；If arriving the search threshold sent when bag number of times limits
Value, still little than the searching threshold arranged, then increase searching threshold.Contrary, if sent out for the last time
Also have remaining searching threshold when sending bag, then increase packet broadcast radius.
The when that upper-layer protocol having data to send, packet receiving function is called by system, in the interpolation of this packet
IP header, then carries out routing resolution.Adding a route to destination node in the routing table, keeping in should
Packet, then sends request bag, sends routing request packet and searches out the route of destination node.Now in source
The routing table of node is set up a route from source node to destination node.
When node receives routing request packet, first determine whether whether this routing request packet is that oneself sends, if
It is to abandon this routing request packet and terminate to process.Followed by setting up reversely route.Search in routing table and be
No have the route to source node, if not having, then adds a route.Then, it is judged that to the route of source node
The need of renewal.After having updated source node route, sending the packet arriving source node in caching all
Send.Thus establish reverse route.Then, it is judged that whether this node is destination node.If
It is then to send respond packet and carry out route response.Otherwise, search in routing table whether have the road to destination node
By.If having, sending respond packet and carrying out route response (arriving destination node through available).If the most do not looked for
To the route of destination node, then this routing request packet is broadcasted, continually looks for route.
The foundation of forward direction route, sets up during receiving respond packet.When node receives sound
When should wrap, first look for whether routing table has the route to destination node.If no, then setting up target
The route of node.Then, it is judged that to the route of destination node the need of renewal.After having updated route, sentence
Whether this node disconnected is source node, just arranges corresponding entry if being.If this node has mesh to be sent to
The packet of mark node, then perform transmission.If route does not update, then abandon this response, thus reduce number
According to transmission.If this routing update but this node is not destination node; whether search routing table have and to save to source
The route of point, if having, forwards this response, otherwise, abandons this response and terminates to process.Each node passes through
Receive response, the route of destination node is set to, has thus set up forward direction route.
The maintenance of routing table is made up of three parts: local reparation, heartbeat packet, route-caching intervalometer.When one
The when that bar route occurring to interrupt, if it occur that the nodal distance destination node interrupted is closer, route is called
Local repair function, carries out route repair.The timing of each node sends heartbeat packet to neighbor node, comes with this
The connectivity of detection neighbor node, removes the neighbor node interrupted in time, thus removes the route of interruption in time.
Route-caching intervalometer can timing detection routing table, the in time route entry of time-out in removing routing table.Pass through
These three function guarantees it is up-to-date route in routing table.
When in link, certain node relative velocity signal intensity that is excessive or that receive is too low, this circuit
Just there is the risk of interruption, in order to avoid the link of high power consumption and high latency, have employed method below: respectively
Threshold value is set for the energy consumption of node and the received signal strength of node.If certain node in link reaches
Threshold value, sends notice from destination node to opposite direction, and notice source node has the risk causing link down, root
Whether disruption risk is had, by every from this node to this section of link of destination node according to node maintenance each in link
Whether the sending node of link section is it may determine that have disruption risk from this node to this section of link of destination node.
As new link does not deposit risk in a link, then use the route being newly added, otherwise use original route.
Disruption risk often occurs it is necessary to it is carried out a suboptimization process so that communication process route
Gradually become the route lines that disruption risk is minimum.Optimize Routing Protocol time consider signals below receiving intensity and
The impact on Route Selection of the node energy consumption parameter:
Internodal signal receiving strength can be calculated as follows, and the signal intensity that its interior joint receives is g；
PcFor signal transmission power；HcLink gain for sending node；HrLink gain for receiving node；lc
For sending the length of link；lrFor receiving node linkage length, s is the spacing between two nodes；K is for damaging
Lose coefficient.
G=PcHcHrlclr/s3k
Size g of signal intensity judgment thresholdtIt is defined as:
gt=gn×t+g
T represents the time delay that cannot receive signal, gnIllustrate the node energy consumption when two adjacent signal receive
Successively decrease；By controlling threshold range, when less than certain scope, select search new routing link and safeguard
New routing link table.
Additionally, carry out range set according to the energy consumption of each node, in following equation, U is to remain basic
The energy consumption of communication；R is node energy consumption power；T is that energy consumption uses up the time, node total energy consumption Ut=(R × t)+U
Assume that elapsed time is ts, DtRepresent t node energy consumption situation, then energy consumption power R can be with table
It is shown as R=(D(t-ts)-Dt)/ts
Have only to control UtThe threshold value of energy consumption, is the most just avoided that the risk that routing link interrupts.
In the acquisition of media stage, it is first turned on media device file, reads photographic head in structure, image
Essential information, arranges the information parameter of acquisition of media.The media formats of capture, resolution, frame rate are set；
Control management media device I/O passage, carry out inquiring about and arrange media device attribute；Media-driven interface passes through
Internal memory mapping mode, by application to address, kernel buffers be mapped to user's space, define an input
Queue and an output queue.The former is to wait for receiving the queue of storage media data, and the latter is to have been placed in
The queue of media data.Acquisition of media application program by application to relief area be put into successively input rank row
Team, then starts acquisition of media, each frame media data gathered sequentially is put into the relief area of input rank
In.The relief area storing media data is moved to output queue by driver successively, waits application program
Take out relief area and process media data therein.After having processed data, this relief area is placed again into
Input rank is queued up.The frame buffer zone just processed is placed again into Gather and input queue tail.
The edge direction of image block is done pretreatment by existing method, calculates complexity, is not suitable for terminal high definition
The real-time Transmission of media；And code check change is huge, the bandwidth of power line channel is proposed challenge.The present invention
A kind of interframe compression transmission method being applicable to vehicle-mounted media is proposed, based on inter mode decision algorithm and adopt
Spend gently with image and judge.
The original pixel value of input macro block and macro block position information to be predicted, first carry out horizontal pattern and vertical mould
Formula is predicted, calculates the predictive value under both patterns respectively, then subtracts each other with original pixel value and obtain each pattern
Under residual sum cost value, compare and obtain the pattern of minimum cost value and be optimum prediction mode.To pass through again
Optimal mode adjudicates the optimal mode and optimal cost value input selector drawn, carries out the right side according to optimal mode
Vertical mode, lower horizontal pattern, left vertical mode and the prediction of upper horizontal pattern, the more optimal mould that will obtain
Formula and the next selector of optimal cost value input carry out the judgement of optimal mode；Through judging step by step, obtain
Final predictive mode and optimal cost value；After prediction terminates, output optimal mode and cost value, and export
Good residual error.Output residual error carries out dct transform, quantifies, then carries out inverse process, and both inverse quantization and IDCT became
Changing, output valve adds best predictor, completes the reconstruct of macro block.Wherein, through DCT quantify after the most residual
Difference data is transported to the transmission of NAL layer after carrying out entropy code again.
In inter predication process, by under vertical coordinate identical in computing macro block, it is separated by two pictures of abscissa
The absolute value of element gray scale difference judges that this macro block is the mildest, and i.e. 16 × 16 macro blocks are spent T gently and are defined as
T=∑ | (x+2, y)+(x+3, y)-(x, y)-(x+1, y) |
x∈[1,12] y∈[1,15]
Two threshold T are set1And T2As the basis for estimation that macro block is mild, spend gently in advance according to image
Judge interframe prediction block sizes, so that it is determined that use 16 × 16 or 8 × 8 pieces to carry out inter prediction；If T
＜ T1, use 16 × 16 to carry out inter prediction, if T is ＞ T2, use 8 × 8 pieces and carry out inter prediction, its
In the case of him, use 16 × 16 and 8 × 8 pieces to carry out inter prediction simultaneously；
Carrying out inter prediction for 8 × 8 macro blocks, utilizing procedure below to skip can not become optimal 8 × 8
Predictive mode, the amount of calculation of minimizing coding:
The minimum RDO cost of obtaining mode 0 and 1, continues search for its neighboring modes, calculates respective
RDO cost, then carries out the comparison of neighboring modes.Use and press with left reference pixel above current macro
Lower-left is to the interpolation of upper right as predictive value, and wherein left and top neighbor pixel are respectively as follows:
Acquisition predicts the outcome:
Pre (x, y)=((5 × H) (i-7)+(5 × V) (j-7))/64+16 wherein i, j ∈ [0,15]
In sum, the present invention proposes a kind of vehicle-mounted image data transfer method, according to onboard system and joining
The feature of Network Communication, is optimized acquisition of media and transmission, improves the overall performance of vehicle-mounted media transmission.
Obviously, it should be appreciated by those skilled in the art, each module or each step of the above-mentioned present invention are permissible
Realizing by general calculating system, they can concentrate in single calculating system, or is distributed in many
On the network that individual calculating system is formed, alternatively, they can use the executable program code of calculating system
Realize, it is thus possible to be stored in storage system being performed by calculating system.So, this
Bright be not restricted to any specific hardware and software combine.
It should be appreciated that the above-mentioned detailed description of the invention of the present invention is used only for exemplary illustration or explains this
The principle of invention, and be not construed as limiting the invention.Therefore, without departing from the spirit and scope of the present invention
In the case of any modification, equivalent substitution and improvement etc. done, should be included in protection scope of the present invention
Within.Additionally, claims of the present invention be intended to fall into scope and border or
Whole in the equivalents on this scope of person and border change and modifications example.
Claims (1)
1. a vehicle-mounted image data transfer method, it is characterised in that including:
Each node is responded by reception, arranges the route of destination node；When a route occurs to interrupt,
Route is called local repair function and is carried out route repair；The timing of each node sends heartbeat packet to neighbor node,
Remove the neighbor node interrupted and remove the route interrupted, route-caching intervalometer timing detection routing table, and
Time remove the route entry of time-out in routing table, realize the vehicle-mounted matchmaker of electrically-based line communication with current routing table
Body transmits；
Respectively set energy consumption and the received signal strength threshold value of vehicle-mounted node；If certain node in link
Reach threshold value, sent notice from destination node to opposite direction, risk is notified source node, such as new link
Do not deposit disruption risk in a link, then use the route being newly added；
The most internodal signal receiving strength is calculated as:
G=PcHcHrlclr/s3k
The signal intensity that its interior joint receives is g；PcFor signal transmission power；HcChain for sending node
Road gain；HrLink gain for receiving node；lcFor sending the length of link；lrLong for receiving node link
Degree, s is the spacing between two nodes；K is loss coefficient；
Size g of signal intensity judgment thresholdtIt is defined as:
gt=gn×t+g
T represents the time delay that cannot receive signal, gnIllustrate the node energy consumption when two adjacent signal receive
Successively decrease；
By controlling threshold range, when less than certain scope, select search new routing link and safeguard new
Routing link table；
The energy consumption calculation of its interior joint is:
Ut=(R × t)+U
U is the energy consumption maintaining basic communication；R is node energy consumption power；T is that energy consumption uses up the time, if passing through
Time be ts, DtRepresent t node energy consumption situation, then energy consumption power R can be expressed as R=(D(t-ts)-Dt)
/ts
By controlling UtThe threshold value of energy consumption avoids routing link to interrupt.
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|---|---|---|---|
| CN201610571487.8A CN105978742A (en) | 2016-07-19 | 2016-07-19 | Transmission method for onboard image data |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610571487.8A CN105978742A (en) | 2016-07-19 | 2016-07-19 | Transmission method for onboard image data |
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| CN105978742A true CN105978742A (en) | 2016-09-28 |
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| CN1663149A (en) * | 2002-06-27 | 2005-08-31 | 高通股份有限公司 | Method and apparatus for forward link gain control in a power controlled repeater |
| CN104936169A (en) * | 2014-03-18 | 2015-09-23 | 中国移动通信集团公司 | Safety verification processing method, device, terminal and base station thereof |
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