CN202168221U - Wireless video sensor network node device - Google Patents
Wireless video sensor network node device Download PDFInfo
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- CN202168221U CN202168221U CN2011202755883U CN201120275588U CN202168221U CN 202168221 U CN202168221 U CN 202168221U CN 2011202755883 U CN2011202755883 U CN 2011202755883U CN 201120275588 U CN201120275588 U CN 201120275588U CN 202168221 U CN202168221 U CN 202168221U
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Abstract
The utility model relates to a wireless video sensor network node device and mainly solves shortcomings of complicated design, low video transmission efficiency and the like in a prior device. The wireless video sensor network node device is a wireless audio and video collecting and transmitting device based on H.264 which is a highly compressed digital video Codec raised by Zigbee low rate wireless communication protocol and JVT (Joint Video Team). In the utility model, an MX 27 processor is used for realizing video compression and coding. A Zigbee radio frequency module is equipped for realizing the wireless transmission of audio and video. The Zigbee radio frequency module supports a 2.4 GHz Zigbee standard and can communicate with data monitoring nodes distributed in an area to be monitored. The wireless video sensor network node device in the utility model has advantages of Zigbee technology and H.264 video compression standard, and has characteristics of high transmission efficiency, good communication quality, low power consumption, low cost, large network capacity, strong network self-organization ability and the like, thereby satisfying requirements of video collecting and transmitting application occasions having low video quality requirements.
Description
Technical field
The utility model relates to a kind of wireless video sensor network node device, and this equipment utilization IMX27 processor is realized video acquisition and compressed encoding, utilizes the Zigbee wireless communication technique to realize transfer of data, belongs to wireless telecommunications and embedded system technology field.
Background technology
Wireless sensor network (Wireless Sensor Networks; WSNs) as an emerging technology; Form by being deployed in the monitored area a large amount of cheap miniature nodes; Through the self-organizing network of a multi-hop of wireless communication mode formation, cooperation ground is gathered and is handled the perceptive object message in the monitored area, and sends to the observer.Its appearance provides a kind of brand-new message to obtain and tupe.The WSNs technology has obtained extensive use in various fields such as environmental monitoring, military investigation, Smart Home, intelligent transportation, Industry Control, is that wireless senser is in the typical application aspect the monitoring and monitor based on the video of wireless sensor network.
In recent years; Utilize the video sensor node device collection of dispersed and distributed; Compressed video data is transferred to wireless video sensor network (Wireless Video Sensor Node Platform, WVSNP) the research develop rapidly of destination node through wireless mode.Relevant with it many technology have been tending towards ripe, like multitiered network structural research, and multi-sensor image integration technology, image and video compression technology, home control network communication protocol etc.Simultaneously, the application of wireless video sensor network also constantly enlarges, and is included in computer vision, video tracking and location, and video monitoring, remote live video and control aspect have all obtained application.
The Zigbee technology is a kind of near field communication (NFC) that latest developments are got up, and low rate, low-power consumption, the characteristics that the MANET ability is strong are widely used in the wireless sensor network it.Can only reach 250 kbps but its transmission rate is the highest,, otherwise realize that in this network environment the transmission of video almost is impossible only if adopt video compression technology efficiently.
The radio video sensor node device based on the Zigbee technology of external comparative maturity has " MeshEye " of Stanford University's wireless senser laboratory research and development, " WiSN "; " XYZ " of Yale University's research and development, these several kinds of platforms adopt TI CC2420 as radio frequency chip, support the transmission of video images of low rate.But do not have the software/hardware image processing function.Thereby can't show the continuous video transmission surely.The Imote2 platform of Crossbow company is supported IEEE 802.15.4/Zigbee agreement; The DSP of its graphics processing unit supports more than 30 MMX Video processing instruction; Greatest frame rate can reach 15 SXGA (1280*1024) fps/ 30 VGA (640x480) fps, be a kind of well behaved wireless video apparatus for network node, but its price is more expensive; Complex structure, the application and development difficulty is bigger.
Summary of the invention
The purpose of the utility model is the deficiency to prior art, and a kind of wireless video sensor network node device is provided.This equipment is based on high compression digital video coding-coding device standard that Zigbee low rate home control network communication protocol and JVT propose H.264 wireless video collection and transmission equipment.This equipment has been realized in low rate, the collection of video communications and transmission in the low power consumption wireless network.
The utility model is the technical scheme that its purpose of realization is taked: a kind of wireless video sensor network node device comprises microprocessor and the coupled respectively sound that connects, video acquisition unit, memory cell, Zigbee radio frequency unit, PMU and communication unit;
Said microprocessor adopts the IMX27 module, and said Zigbee radio frequency unit adopts the MC13192 module, is connected with the CSPI interface of said IMX27 module through the SPI interface;
Said sound, video acquisition unit comprise video acquisition unit and audio collection unit; Said video acquisition unit adopts Micron MT9D131 module; Be connected with the cmos sensor interface CSI of IMX27, connect the control that realizes this module through
;
Said audio collection unit adopts audio codec WM8974 module, and its SSI 1 port is connected with said IMX27 module with CSPI 1 port, the voice data that SSI 1 port transmission is gathered, and SPI 1 port is accomplished relative parameters setting in the audio collection;
Said PMU is the LM26480 power management chip; Said communication unit comprises RS232/485 serial ports and hard disk.
Said IMX27 module integrated ARM 926EJ-S microprocessor core and video compression hardware compression device H.264.
Said LM26480 power management chip with the input the 3.3V supply voltage respectively step-down be 2.75V, 1.8V, 1.4V.
The workflow of the utility model: collect the audio frequency and video signal from front end audio frequency microphone and CMOS video sensor; Generate the digital audio/video formatted data through audio frequency and video A/D conversion back, obtain H.264 video flowing and ACC audio stream respectively through IMX27 microprocessor compressed encoding again after the preliminary treatment.These audio/video flows are stored in when wireless sensor network is busy in the node hard disk, when network is idle, directly send to destination node.
The utility model is based on high compression digital video coding-coding device standard wireless sound, video acquisition and the transmission equipment H.264 of Zigbee low rate home control network communication protocol and JVT proposition.Utilize the IMX27 microprocessor to realize video compression coding, configuration Zigbee radio-frequency module is realized the wireless transmission of sound, video.The Zigbee radio-frequency module is supported 2.4GHz Zigbee standard, can with the data monitoring node communication that is distributed in the area to be monitored.The utility model has the Zigbee technology and the advantage of video compression standard H.264 concurrently; Have the efficiency of transmission height, communication quality is good, power consumption is little, cost is low, network capacity is big; Characteristics such as the self-organization of network ability is strong have satisfied various to the needs of the low video acquisition of video quality requirement with the transmission application scenario.The application of the H.264 video compression technology of high data compression rate makes that at low data rate the unsettled Zigbee transmission through network of network environment high-quality video becomes possibility.
The advantage of the utility model is mainly reflected in the following aspects:
(1) sound, video transmission be in strict accordance with the regulation of IEEE802.15.4 standard to physical layer and MAC layer, and Zigbee alliance is beneficial to interconnection and MANET between the video sensor node to the requirement of network layer and application layer.Advantages such as this node device has Zigbee and is prone to self-organizing network, and open ended network equipment number is many.
(2) the utility model has been realized the collection and the transmission of the high-quality audio frequency and video in the low rate Zigbee network.
(3) the utility model equipment power dissipation is low.The microprocessor that adopts has adopted multiple power-saving technique, and radio-frequency module has multiple park mode, and these technology equipment that makes can work long hours under battery powered condition, satisfies long-term unattended wireless video monitoring application need;
(4) be different from the ARM-DSP dual processor framework of conventional video processing unit, built-in ARM 9 nuclears of the microprocessor unit that the utility model adopts and hardware compression device H.264.Wherein, ARM nuclear is as the control centre of entire equipment, and collection, processing and the transfer function of audio frequency and video accomplished in control.H.264 the hardware compression device does not take cpu resource when video compression, and video processing speed is higher.
(5) the H.264 Standard of image compression that adopts of the utility model has low code check, and the characteristics that fault-tolerant ability is stronger are particularly suitable for the application of video transmission under the wireless sensor network environment.
Description of drawings
Fig. 1 is a wireless video sensor network node device structural representation;
Fig. 2 is that each unit of wireless video sensor network node device is connected sketch map with processor;
Fig. 3 is sound, videl signal flow diagram.
Embodiment
Fig. 1 is the utility model wireless video sensor network node device structural representation, and the utility model comprises microprocessor 1 and the coupled respectively sound that connects, video acquisition unit 2, memory cell 3, Zigbee radio frequency unit 4, PMU 5 and communication unit 6.Microprocessor 1 adopts the IMX27 module of Freescale Semiconductor, and it includes high performance ARM 926EJ-S nuclear and hardware-compressed codec H.264.Wherein, ARM nuclear is as the control centre of entire equipment, and the collecting unit of control audio frequency and video is accomplished the collection of audio frequency and video and the communication of control MC13192 and other wireless sensor network nodes.H.264 the hardware-compressed codec is accomplished the compressed encoding of sound, videl signal.
Zigbee radio frequency unit 4 adopts the MC13192 module, is connected with the CSPI interface of said IMX27 module through the SPI interface.
Sound, video acquisition unit 2 comprise video acquisition unit 2-1 and audio collection unit 2-2, and the EEPROM 2-3 that is used for the imageing sensor parameter configuration.Video acquisition unit 2-1 adopts Micron MT9D131 module.Micron MT9D131 module is a kind of video sensor of 2,000,000 pixels; Be connected with the cmos sensor interface CSI of IMX27, connect the control that realizes this module through
.EEPROM links to each other with IMX27
port, accomplishes cmos sensor parameter configuration and control.Audio collection unit 2-2 adopts audio codec WM8974 module, and its SSI 1 port is connected with said IMX27 module with CSPI 1 port, the voice data that SSI 1 port transmission is gathered, and CSPI 1 port is accomplished relative parameters setting in the audio collection; PMU 5 is the LM26480 power management chip; Said communication unit 6 comprises RS232/485 serial ports 6-1 and hard disk 6-2.The LM26480 power management chip with the 3.3V supply voltage of input respectively step-down be 2.75V, 1.8V, 1.4V, check the different needs of voltage to satisfy imageing sensor, memory cell, CPU.Audio codec is connected with IMX27 CSPI 1 port through SSI 1 port, SSI 1 port transmission voice data, and CSPI 1 port is accomplished relative parameters setting.
Different chips are different to the requirement of supply voltage with processing unit in the utility model equipment.Need 1.4V voltage like CPU nuclear, imageing sensor needs 2.75V voltage, and memory cell needs 1.8V voltage, and Zigbee radio frequency unit, audio collection unit all need 3.3V voltage.Therefore, PMU 5 is selected the LM26480 power management chip for use, is the needed voltage of system unit with the input voltage step-down of 3.3V.Wherein, the Buck 1 of LM26480 provides 1.4V voltage, and LDO1 provides 2.75V voltage, and Buck 2 provides 1.8V voltage.
Communication unit 6 comprises RS232/485 serial ports 6-1 and hard disk 6-2, wherein the RS232 serial ports be used for need with the occasion of the direct communication of computer; Hard disk is used for wireless sensor network when busy, preserves sound, the video data of gathering when node is interim, by the time network is sent to destination node with the data in the hard disk when idle again.RS232 and hard disk respectively with the UART 1 of microprocessor unit, ata port connects.
Connected mode and the port agreement observed are as shown in Figure 2 between each unit.
Shown in Figure 3 is sound, the videl signal flow diagram of the utility model.
As shown in Figure 3, cmos sensor collection site video communications and digitlization, digitized video data is realized the video preprocessor processing through the integrated hardware accelerator (eMMA) of IMX27 earlier.Again video is sent into H.264 hardware coder, press H.264 video compression standard compressed video data.For realizing the video Data Transmission in the Zigbee network, the data flow after also needing to encode is packaged into the Frame of the data frame format that meets Zigbee.Subsequently, judge whether network is in busy state, then data are stored in the node hard disk when network is busy temporarily, when network is idle, redispatch.Network directly utilizes radio frequency unit MC13192 that video data is sent with the spread spectrum mode when idle.Video data according to the difference of destination node, is ultimately delivered to destination node with the mode of single-hop or multi-hop when the Zigbee transmission through network.Subsequently, the destination node decode video data is for further processing and uses.Fig. 3 is the videl signal handling process, and each step is following:
Step 1: sound, video sensor collection site sound, video data
Step 2: to the sound of simulation, video data digitlization and preliminary treatment
Step 3:H.264 video compression standard compressed video data
Step 4: the data flow after will encoding is packaged into and meets Zigbee specification data frame.
Step 5: direct transmission data when network is idle, when busy temporarily with storage in the node hard disk
Step 6: data are sent to destination node with single-hop or multi-hop mode
Step 7: destination node receives and decompress(ion), recovers sound, video communications.
Audio signal handling process and videl signal handling process basically identical.
Claims (3)
1. wireless video sensor network node device; Comprise microprocessor (1) and the coupled respectively sound that connects, video acquisition unit (2), memory cell (3), Zigbee radio frequency unit (4), PMU (5) and communication unit (6), it is characterized in that:
Said microprocessor adopts the IMX27 module, and said Zigbee radio frequency unit (4) adopts the MC13192 module, is connected with the CSPI interface of said IMX27 module through the SPI interface;
Said sound, video acquisition unit (2) comprise video acquisition unit (2-1) and audio collection unit (2-2),
Said video acquisition unit (2-1) adopts Micron MT9D131 module; Be connected with the cmos sensor interface CSI of IMX27, connect the control that realizes this module through
;
Said audio collection unit (2-2) adopts audio codec WM8974 module; Its SSI 1 port is connected with said IMX27 module with CSPI 1 port; The voice data that SSI 1 port transmission is gathered, SPI 1 port is accomplished relative parameters setting in the audio collection;
Said PMU (5) is the LM26480 power management chip; Said communication unit (6) comprises RS232/485 serial ports (6-1) and hard disk (6-2).
2. video sensor network node device according to claim 1 is characterized in that: said IMX27 module integrated ARM 926EJ-S microprocessor core and video compression hardware compression device H.264.
3. video sensor network node device according to claim 1 is characterized in that: said LM26480 power management chip with the input the 3.3V supply voltage respectively step-down be 2.75V, 1.8V, 1.4V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202755883U CN202168221U (en) | 2011-08-01 | 2011-08-01 | Wireless video sensor network node device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202755883U CN202168221U (en) | 2011-08-01 | 2011-08-01 | Wireless video sensor network node device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104981029A (en) * | 2015-06-26 | 2015-10-14 | 深圳市科信通信技术股份有限公司 | Wireless self-organizing network audio and video communication system |
| CN105992007A (en) * | 2015-03-03 | 2016-10-05 | 中国联合网络通信集团有限公司 | Wireless video transmission method and device |
-
2011
- 2011-08-01 CN CN2011202755883U patent/CN202168221U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105992007A (en) * | 2015-03-03 | 2016-10-05 | 中国联合网络通信集团有限公司 | Wireless video transmission method and device |
| CN104981029A (en) * | 2015-06-26 | 2015-10-14 | 深圳市科信通信技术股份有限公司 | Wireless self-organizing network audio and video communication system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120314 Termination date: 20140801 |
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| EXPY | Termination of patent right or utility model |