CN102930720A - Video-based traffic information detection device and method - Google Patents
Video-based traffic information detection device and method Download PDFInfo
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- CN102930720A CN102930720A CN2012104135047A CN201210413504A CN102930720A CN 102930720 A CN102930720 A CN 102930720A CN 2012104135047 A CN2012104135047 A CN 2012104135047A CN 201210413504 A CN201210413504 A CN 201210413504A CN 102930720 A CN102930720 A CN 102930720A
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Abstract
The invention discloses a video-based traffic information detection device and method. The device comprises a pick-up lens, a photosensitive chip board, an image processing board, an interface board and a power supply interface which are sequentially connected, wherein the pick-up lens is used for projecting an image of a road scene onto the photosensitive chip board, the photosensitive chip board is used for transforming the image to a digital image and outputting the digital image onto the image processing board, the results of traffic information can be obtained by processing via the image processing board and output through the interface board, and the power supply interface is used for providing a power supply required for the device. The invention further discloses a video-based traffic information detection method. According to the device and the method, disclosed by the invention, the volume is significantly reduced, the cost is saved, the interface is flexible, the mounting, operation and management are facilitated, and the obtained information can be sent to a traffic management center through a communication interface for traffic control and monitoring.
Description
Technical field
The present invention relates to the intelligent transport technology field, relate in particular to a kind of traffic information detection device based on video and method.
Background technology
Along with continuing to increase of large-and-medium size cities vehicle population, caused thus many traffic problems, crowded such as road, Frequent Accidents, ecological deterioration, air pollution are day by day serious.In order to address these problems, intelligent transportation system (Intelligent Transportation Systems, ITS) in response to and give birth to.Along with people to the going deep into of the understanding of people, car, road Relations Among, intelligent transportation system is being brought into play more and more important effect day by day in people's life.Intelligent transportation system is take computing machine as instrument, take infotech as means, with the relation between landman, car, the road, by efficient, safe, the energy-conservation communications and transportation of multifactorial collaborative realization.The research in this field has been obtained in countries in the world paying attention to widely, and obtained and develop rapidly.Develop at present, existing a lot of business systems are being used.
Aspect the traffic control and monitoring of intelligent transportation system, be the core of system to the detection and tracking of operational vehicle on the road.By detection and the tracking to vehicle, can obtain the transport information such as vehicle flowrate, running velocity in detected highway section, traffic signals control and inducible system can be controlled traffic signals or induce according to the transport information that detection obtains, and realization is to the control of traffic.
Traditional vehicle detection and tracking, mainly contain the hardware devices such as annular magnetic test coil, velocity radar, traffic microwave detector, sound wave detector, there is following shortcoming in these equipment to vehicle Flow Detection: the amount of traffic information information that (1) obtains is relatively less, and it is extremely limited to be applied to analyze data; (2) reliability and confidence level are unstable; (3) Detection accuracy is lower, and the flase drop situation is serious; (4) without surveyed area widely; (5) can't finish in-site modeling to the traffic hazard situation, can't punish vital information to traffic survey and analysis, traffic and finish real-time processing.And based on the transport information extracting method of video technique, video camera is combined with computer vision technique, can effectively overcome the most not enough of aforementioned conventional method.Its major advantage shows: (1) has wider field range, and therefore a cover video camera can be realized the detection in a plurality of tracks, the detecting of a plurality of regional extents; (2) equipment is installed simple and flexible, need not to destroy existing road environment, can not affect traffic and normally move.And pollution economical and practical, that produce is little, cost performance is high; (3) amount of traffic information that obtains is abundant, and is with a high credibility.Vehicle flowrate parameter detection method based on video technique not only can obtain the ordinary traffic information such as vehicle number, the speed of a motor vehicle, vehicle acceleration, and general detecting device can also be obtained and the vehicle movement track can't be obtained, and the relevant information such as traffic accident; (4) real-time is high, can carry out real-time analysis to the data that obtain, and draw out the chart of various parameter Relations Amongs, and traffic is carried out simulation and forecast; (5) stronger transplantability, extendability and reusability are arranged, conveniently carry out secondary development.(6) have Real Time Monitoring and intelligent management function, for administrative authority provides the site traffic event simulation, and for administrative authority provides the visual image evidence, so that carry out evidence-gathering and accident reaction.
Existing transport information based on video technique detects, and generally comprises following components: (1) camera; (2) video frequency collection card; (3) computing machine; (4) operation functional software on computers.Camera is installed in the scene, is used for obtaining image scene, then sends images on the computing machine of Surveillance center by wired or wireless communication mode and processes.Because the transmission of image information needs higher bandwidth, therefore this mode is very high to the requirement of the communication link in the system, causes cost also fine.Along with the development of embedded computing technique, the image processing system based on digital signal processing chip also occurred, and be applied in the transport information detection.In this type systematic, on near the image information that camera obtains is connected to by cable the digital image processing system, the integrated digitizer spare of image on digital image processing system, can realize the function of similar capture card, digital signal processing chip (such as DSP) is finished the processing to image, and result is sent to the equipment that needs data.But this disposal system based on digital signal processing chip needs long cable that analog picture signal is connected on the disposable plates of system, and volume is larger, installs inconvenient.
Summary of the invention
The technical matters that the present invention solves be the image processing with shooting, sensitization is integrated separates, equipment volume is larger, installs inconvenient.
In order to solve above technical matters, the embodiment of the invention discloses a kind of traffic information detection device based on video, comprise the pick-up lens, sensitive chip plate, image processing board and interface board and the power supply interface that are linked in sequence; Pick-up lens with the image projecting of road scene to the sensitive chip plate, the sensitive chip plate is converted into digitized image with image and outputs on the image processing board, process the result who obtains transport information through image processing board, and by interface board output, power supply interface provides needed power supply for device.
Preferably, also comprise signal connecting line, be used for connecting sensitive chip plate, image processing board and interface board.
Preferably, also comprise the machine box, pick-up lens, sensitive chip plate, image processing board, interface board and power interface are fixedly mounted on the machine box.
Preferably, also comprise mechanical mounting interface in machine box one side, whole device is fixed by mechanical mounting interface.
Preferably, the sensitive chip plate further comprises: sensitive chip, clock circuit, sensitive chip plate output interface circuit and sensitive chip plate power module, sensitive chip is exported digitized image under the driving of clock circuit, this digital image signal is connected to the image processing board input interface circuit by sensitive chip plate output interface circuit, and sensitive chip plate power module provides power supply.
Preferably, sensitive chip adopts cmos image sensitive chip or ccd image sensitive chip.
Preferably, image processing board further comprises the power module of image processing board input interface circuit, processor, image processing board output interface circuit, storer and image processing board, processor on the image processing board reads digital image information by the image processing board input interface circuit, and through processing the result who obtains transport information, result is sent to interface board by the image processing board output interface circuit, storer is used for storage intermediate image information, and the power module of image processing board provides power supply.
Preferably, image processing board output interface circuit Adoption Network interface RJ45 or RS232/422/485 interface or general Purpose IO Interface GPIO or VGA or USB or Flash card or jtag interface.
Preferably, also comprise camera pan-tilt, pick-up lens is installed on the camera pan-tilt, and remote-controlled.
The embodiment of the invention also discloses a kind of traffic information detection method based on video information process, may further comprise the steps:
A) by the interface on the interface board, connect display and mouse, the Digital Image Display that processor obtains the image chip plate is to display, the user passes through mouse, interested road area is set on the image or by network interface the area-of-interest that sets is sent to processor, finish the setting of road area interested on the image;
B) digital image sequence that gathers by image processing board input interface circuit Real-time Obtaining sensitive chip plate of processor;
C) processor is to the image sequence of input, only in the area-of-interest that step a) arranges, adopt the method for inter-frame difference, image to adjacent three frames carries out difference, when the difference value of pixel during greater than the threshold value of some prior settings, think that this pixel is the sport foreground point, otherwise be background dot, form thus the binary image zone; Binary image is opened and closed morphology process, to remove isolated noise spot; And the zone, foreground point cut apart and mark, obtain the position of moving vehicle, and record detects the current location of the vehicle that obtains;
D) in a certain time interval, the vehicle that step c) is detected adopts the method for predicting tracing, obtains the running orbit of vehicle, calculates the speed of vehicle according to time interval of image sampling; To obtain the magnitude of traffic flow in this highway section in the unit interval through this regional vehicle number;
E) processor sends to traffic control center with car speed and the traffic flow data that obtains by interface circuit.
Processing and the camera function of the present invention by transport information is integrated, does not need parts and the modules such as image pick-up card, computing machine, has that volume is little, energy consumption is low, easy for installation.In addition, because information processing and image acquisition section are integrated, saved the needed high bandwidth of image transmitting, provided cost savings thus.Affiliated device is installed in different road sections, to realize the examination and controlling to whole road area.Can be used for the application scenario that every needs carry out the moving vehicle detection and tracking in the intelligent transportation system, is the nucleus equipment of intelligent transportation system.
Description of drawings
When considered in conjunction with the accompanying drawings, by the following detailed description of reference, can more completely understand better the present invention and learn easily wherein many advantages of following, but accompanying drawing described herein is used to provide a further understanding of the present invention, consist of a part of the present invention, illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of to improper restriction of the present invention, wherein:
Fig. 1 is based on the traffic information detection device structural representation of video.
Fig. 2 is sensitive chip plate structure synoptic diagram.
Fig. 3 is the image processing board structural representation.
Embodiment
Referring to figs. 1 through Fig. 3 embodiments of the invention are described.
For above-mentioned purpose, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
As Figure 1-3, a kind of traffic information detection device based on video, comprise the pick-up lens 1 that is linked in sequence, sensitive chip plate 2, image processing board 3 and interface board 4 and power supply interface 7, described sensitive chip plate 2 further comprises: sensitive chip 13, clock circuit 14, sensitive chip plate output interface circuit 15 and sensitive chip plate power module 16, sensitive chip 13 is exported digitized image under the driving of clock circuit 14, this digital image signal is connected to image processing board input interface circuit 9 by sensitive chip plate output interface circuit 15, and sensitive chip plate power module 16 provides power supply; Described image processing board 3 further comprises the power module 12 of image processing board input interface circuit 9, processor 8, image processing board output interface circuit 10, storer 11 and image processing board, processor 8 on the image processing board 3 reads digital image information by image processing board input interface circuit 9, and through processing the result who obtains transport information, result is sent to interface board 4 by image processing board output interface circuit 10, storer 11 is used for storage intermediate image information, and the power module 12 of image processing board provides power supply; Described image processing board output interface circuit 10 Adoption Network interface RJ45 or RS232/422/485 interface or general Purpose IO Interface GPIO or VGA or USB or Flash card or jtag interface; Pick-up lens 1 with the image projecting of road scene to sensitive chip plate 2, sensitive chip plate 2 is converted into digitized image with image and outputs on the image processing board 3, process the result who obtains transport information through image processing board 3, and by interface board 4 outputs, power supply interface 7 provides needed power supply for device.Also comprise signal connecting line 6, be used for connecting sensitive chip plate 2, image processing board 3 and interface board 4.Also comprise machine box 5, pick-up lens 1, sensitive chip plate 2, image processing board 3, interface board 4 and power interface 7 are fixedly mounted on the machine box 5.Also comprise mechanical mounting interface 17 in machine box 5 one sides, whole device is fixing by mechanical mounting interface 17.
Embodiment 1:
In embodiment 1, sensitive chip 13 on the sensitive chip plate 2 adopts CCD class chip, realize the clock driver circuit 14 of CCD sensitive chip by piece of CPLD, and adopt the simulation output of a slice analog front-end chip and CCD to link to each other, realize the amplification of CCD chip signal output.On image processing board 3, image processing board input interface circuit 9 adopts a slice TVP5150 to realize the A/D conversion of image, the TMS320DM642 multimedia processor chip of processor adopting TI company, storer 11 adopts the SDRAM chip of two 16bit, and a slice flash storer, be used for storage code and data.Interface board 4 has network interface, RS232 interface and jtag interface.
Embodiment 2:
In embodiment 2, sensitive chip 13 on the sensitive chip plate 3 adopts CMOS class chip, realize that by piece of CPLD CMOS sensitive chip 13 required clocks drive 14 signals, the digital signal of CMOS chip output is directly received image processing board 3, in image processing board input interface circuit 9, adopt after the data image signal process cementing logic of FPGA of FPGA with CMOS output, temporarily be kept in the SRAM storer 11, the TMS320DM6467 multimedia processor chip of the processor adopting TI company on the image processing board 3, two kernels of DSP of this chip internal is integrated ARM9 and C64X+, the storer of DDR2 has been expanded in the outside, utilize the DSP kernel to finish image processing algorithm, the interface resource that enriches that provides with ARM nuclear links to each other with interface board, the interface that provides comprises network, USB, RS232, JTAG, the VGA interface is realized by VPort ports-Extending a slice video encoder SAA7121 of DSP.
The invention also discloses a kind of traffic information detection method based on video information process, road area interested arranges in the image that at first sensitive chip is obtained, then, vehicle to process in the image of interest zone carries out detection and tracking, and according to information such as the tracking results calculating magnitude of traffic flow and car speeds, specifically may further comprise the steps:
A) by the interface on the interface board, connect display and mouse, the Digital Image Display that processor obtains the image chip plate is to display, the user passes through mouse, interested road area is set on the image or by network interface the area-of-interest that sets is sent to processor, finish the setting of road area interested on the image;
B) digital image sequence that gathers by image processing board input interface circuit Real-time Obtaining sensitive chip plate of processor;
C) processor is to the image sequence of input, only in the area-of-interest that step a) arranges, adopt the method for inter-frame difference, image to adjacent three frames carries out difference, when the difference value of pixel during greater than the threshold value of some prior settings, think that this pixel is the sport foreground point, otherwise be background dot, form thus the binary image zone; Binary image is opened and closed morphology process, to remove isolated noise spot; And the zone, foreground point cut apart and mark, obtain the position of moving vehicle, and record detects the current location of the vehicle that obtains;
D) in a certain time interval, the vehicle that step c) is detected adopts the method for predicting tracing, obtains the running orbit of vehicle, calculates the speed of vehicle according to time interval of image sampling; To obtain the magnitude of traffic flow in this highway section in the unit interval through this regional vehicle number;
E) processor sends to traffic control center with car speed and the traffic flow data that obtains by interface circuit.
Although more than described the specific embodiment of the present invention, but those skilled in the art is to be understood that, these embodiments only illustrate, those skilled in the art can carry out various omissions, replacement and change to the details of said method and system in the situation that does not break away from principle of the present invention and essence.For example, merge the said method step, then belong to scope of the present invention thereby carry out the identical function of essence according to the identical method of essence to realize the identical result of essence.Therefore, scope of the present invention is only limited by appended claims.
Claims (10)
1. the traffic information detection device based on video is characterized in that, comprises the pick-up lens, sensitive chip plate, image processing board and interface board and the power supply interface that are linked in sequence; Pick-up lens with the image projecting of road scene to the sensitive chip plate, the sensitive chip plate is converted into digitized image with image and outputs on the image processing board, process the result who obtains transport information through image processing board, and by interface board output, power supply interface provides needed power supply for device.
2. described traffic information detection device based on video according to claim 1 is characterized in that, also comprises signal connecting line, is used for connecting sensitive chip plate, image processing board and interface board.
3. described traffic information detection device based on video according to claim 2 is characterized in that also comprise the machine box, pick-up lens, sensitive chip plate, image processing board, interface board and power interface are fixedly mounted on the machine box.
4. described traffic information detection device based on video according to claim 3 is characterized in that also comprise mechanical mounting interface in machine box one side, whole device is fixed by mechanical mounting interface.
5. according to claim 1 to the described traffic information detection device based on video of 4 any one, it is characterized in that, described sensitive chip plate further comprises: sensitive chip, clock circuit, sensitive chip plate output interface circuit and sensitive chip plate power module, sensitive chip is exported digitized image under the driving of clock circuit, this digital image signal is connected to the image processing board input interface circuit by sensitive chip plate output interface circuit, and sensitive chip plate power module provides power supply.
6. described traffic information detection device based on video according to claim 5 is characterized in that, described sensitive chip adopts cmos image sensitive chip or ccd image sensitive chip.
7. according to claim 1 to the described traffic information detection device based on video of 4 any one, it is characterized in that, described image processing board further comprises the image processing board input interface circuit, processor, the image processing board output interface circuit, the power module of storer and image processing board, processor on the image processing board reads digital image information by the image processing board input interface circuit, and through processing the result who obtains transport information, result is sent to interface board by the image processing board output interface circuit, storer is used for storage intermediate image information, and the power module of image processing board provides power supply.
8. described traffic information detection device based on video according to claim 7, it is characterized in that described image processing board output interface circuit Adoption Network interface RJ45 or RS232/422/485 interface or general Purpose IO Interface GPIO or VGA or USB or Flash card or jtag interface.
9. described traffic information detection device based on video according to claim 1 is characterized in that, the described camera pan-tilt that also comprises, and pick-up lens is installed on the camera pan-tilt, and remote-controlled.
10. traffic information detection method based on video information process is characterized in that: may further comprise the steps:
A) by the interface on the interface board, connect display and mouse, the Digital Image Display that processor obtains the image chip plate is to display, the user passes through mouse, interested road area is set on the image or by network interface the area-of-interest that sets is sent to processor, finish the setting of road area interested on the image;
B) digital image sequence that gathers by image processing board input interface circuit Real-time Obtaining sensitive chip plate of processor;
C) processor is to the image sequence of input, only in the area-of-interest that step a) arranges, adopt the method for inter-frame difference, image to adjacent three frames carries out difference, when the difference value of pixel during greater than the threshold value of some prior settings, think that this pixel is the sport foreground point, otherwise be background dot, form thus the binary image zone; Binary image is opened and closed morphology process, to remove isolated noise spot; And the zone, foreground point cut apart and mark, obtain the position of moving vehicle, and record detects the current location of the vehicle that obtains;
D) in a certain time interval, the vehicle that step c) is detected adopts the method for predicting tracing, obtains the running orbit of vehicle, calculates the speed of vehicle according to time interval of image sampling; To obtain the magnitude of traffic flow in this highway section in the unit interval through this regional vehicle number;
E) processor sends to traffic control center with car speed and the traffic flow data that obtains by interface circuit.
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Application publication date: 20130213 |