CN108769564A - A kind of image capturing system and image processing method - Google Patents
A kind of image capturing system and image processing method Download PDFInfo
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- CN108769564A CN108769564A CN201810658787.9A CN201810658787A CN108769564A CN 108769564 A CN108769564 A CN 108769564A CN 201810658787 A CN201810658787 A CN 201810658787A CN 108769564 A CN108769564 A CN 108769564A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/01—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/222—Studio circuitry; Studio devices; Studio equipment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/765—Interface circuits between an apparatus for recording and another apparatus
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
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Abstract
The present invention relates to a kind of image capturing system and image processing methods, belong to picture signal technical field.The system includes：Image capture module, image processing module and network transmission module.The LVDS signals received are converted to the accessible digital signal of described image processing module by image capture module, so that image processing module reads LVDS signals from described image acquisition module, and then the LVDS signals to reading carry out compression processing, and give compressed LVDS signal transmissions to the network transmission module, so as to the network transmission module by compressed LVDS signal transmissions to peripheral equipment, speed is relatively slow when solving short LVDS signal transmission distances, transmission, easily causes the technical issues of image interim card.
Description
Technical field
The invention belongs to picture signal technical fields, and in particular to a kind of image capturing system and image real time transfer side
Method.
Background technology
LVDS interface is a kind of technology of Low Voltage Differential Signaling interface, carries out differential signal transmission using low pressure, and difference is believed
Number voltage swing only has 350mV or so.Transmission rate of the signal in differential lines can be made up to hundreds of Mbps using the interface, and
Due to using low pressure and low current type of drive, signal noise and power consumption can be greatly reduced.Adopting for LVDS signals at present
Collection mainly has capture card and LVDS conversion modules, realization method to have FPGA+DSP, FPGA+PCI bus, FPGA+USB transmissions to connect
Mouthful etc..Major function is mostly LVDS signals to be converted to the signals such as VGA, HDMI, and shown locally.
Research people has found that LVDS signal acquisitions exist as following drawbacks at present when studying the application：LVDS signal transmissions away from
From the loss that short, long communication line can increase transmission process, transmission rate is reduced, and influence the integrality of signal；Video is adopted
Truck cost is higher, and technical sophistication has a single function, and needs to design independent software driver, and application range is small, is not easy to expand
Open up other functions.
Invention content
In consideration of it, the purpose of the present invention is to provide a kind of image capturing system and image processing methods, with effective
Ground improves the above problem.
What the embodiment of the present invention was realized in：
An embodiment of the present invention provides a kind of image capturing systems, including：Image capture module, image processing module and net
Network transmission module, described image acquisition module are connect with described image processing module, described image processing module and the network
Transmission module connects；Described image acquisition module turns the LVDS signals received for receiving externally input LVDS signals
It is changed to the accessible digital signal of described image processing module；Described image processing module is used for from described image acquisition module
In the LVDS signals that read carry out compression processing, and give compressed LVDS signal transmissions to the network transmission module；Institute
Network transmission module is stated to be used for compressed LVDS signal transmissions to peripheral equipment.
In optional embodiment of the present invention, further include：First image buffer storage module and the second image buffer storage module, it is described
First image buffer storage module and the second image buffer storage module are connect with described image acquisition module；Described image acquires mould
Block is additionally operable to store transformed LVDS signals to described first image cache module, and first frame picture number has been received in determination
According to when, the second frame image data received is stored and realizes that the alternating of image data is slow to the second image buffer storage module
It deposits.
In optional embodiment of the present invention, described image acquisition module is additionally operable to receive first frame picture number in determination
According to when, send interrupt requests to described image processing module, and the present frame in described first image cache module will be stored in
Image data is placed on the region to be read of itself and described image processing module is waited for read；And determination has received the second frame image
When data, interrupt requests are sent to described image processing module, and it is in the block current to be stored in the second image buffer storage mould
Frame image data is placed on the region to be read of itself and described image processing module is waited for read.
In optional embodiment of the present invention, described image processing module is additionally operable to obtain from the LVDS signals read
Characteristic, and the characteristic is analysed and compared with target data, obtain analysis result；And the analysis is tied
Fruit is sent to the network transmission module.
In optional embodiment of the present invention, described image acquisition module includes FPGA and DDR, described image processing module
Including ARM, the FPGA is connect with the FMC interfaces of the ARM.
In optional embodiment of the present invention, the network transmission module includes：PHY chip and network transformer, it is described
Image processing module sequentially passes through the PHY chip and the network transformer is connect with external network.
The embodiment of the present invention additionally provides a kind of image processing method, is applied to image capturing system, including：Image
Acquisition module, image processing module and network transmission module；The method includes：Described image acquisition module receives external input
LVDS signals, the LVDS signals received are converted into the accessible digital signal of described image processing module；Described image
Processing module carries out compression processing to the LVDS signals read from described image acquisition module, and compressed LVDS is believed
Number it is transferred to the network transmission module；The network transmission module is by compressed LVDS signal transmissions to peripheral equipment.
In optional embodiment of the present invention, described image acquisition system further includes：First image buffer storage module and second
Image buffer storage module, the method further include：Described image acquisition module stores transformed LVDS signals to described first
Image buffer storage module stores the second frame image data received to described when determination has received the first frame image data
Second image buffer storage module realizes the alternating caching of image data.
In optional embodiment of the present invention, the method further includes：Described image acquisition module has received the determining
When one frame image data, interrupt requests are sent to described image processing module, and described first image cache module will be stored in
In current frame image data be placed on itself region to be read wait for described image processing module read；And determination has received
When the second frame image data, interrupt requests are sent to described image processing module, and the second image buffer storage mould will be stored in
Current frame image data in the block are placed on the region to be read of itself and described image processing module are waited for read.
In optional embodiment of the present invention, the method further includes：Described image processing module is from the LVDS read
Characteristic is obtained in signal, and the characteristic is analysed and compared with target data, obtains analysis result；And it will
The analysis result is sent to the network transmission module.
Image capturing system provided in an embodiment of the present invention, including：Image capture module, image processing module and network pass
Defeated module.The LVDS signals received are converted to the accessible digital signal of described image processing module by image capture module,
So that image processing module reads LVDS signals from described image acquisition module, and then the LVDS signals read are pressed
Contracting is handled, and gives compressed LVDS signal transmissions to the network transmission module, so that the network transmission module will compress
For LVDS signal transmissions afterwards to peripheral equipment, speed is relatively slow when solving short LVDS signal transmission distances, transmission, easily causes image
The technical issues of interim card.
Other features and advantages of the present invention will be illustrated in subsequent specification, also, partly be become from specification
It is clear that being understood by implementing the embodiment of the present invention.The purpose of the present invention and other advantages can be by being write
Specifically noted structure is realized and is obtained in specification, claims and attached drawing.
Description of the drawings
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the present invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.Shown in attached drawing, above and other purpose of the invention, feature and advantage will be more clear.In whole
Identical reference numeral indicates identical part in attached drawing.Actual size equal proportion scaling is not pressed deliberately draws attached drawing, emphasis
It is that the purport of the present invention is shown.
Fig. 1 shows a kind of structural schematic diagram for image capturing system that one embodiment of the invention provides.
Fig. 2 shows a kind of structural schematic diagrams for image capturing system that further embodiment of this invention provides.
Fig. 3 shows the flow chart of data processing provided in an embodiment of the present invention.
Fig. 4 shows the flow chart of image processing method provided in an embodiment of the present invention.
Icon：100- image capturing systems；110- image capture modules；120- image processing modules；130- networks
Transmission module；140- the first image buffer storage modules；150- the second image buffer storage modules.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.The present invention being usually described and illustrated herein in the accompanying drawings is implemented
The component of example can be arranged and be designed with a variety of different configurations.
Therefore, below the detailed description of the embodiment of the present invention to providing in the accompanying drawings be not intended to limit it is claimed
The scope of the present invention, but be merely representative of the present invention selected embodiment.Based on the embodiments of the present invention, this field is common
The every other embodiment that technical staff is obtained without creative efforts belongs to the model that the present invention protects
It encloses.
It should be noted that：Similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined, then it further need not be defined and explained in subsequent attached drawing in a attached drawing.
In the description of the present invention, it should be noted that term "center", "upper", "lower", "left", "right", "inner",
The orientation or positional relationship of the instructions such as "outside" be based on the orientation or positional relationship shown in the drawings or the invention product use
When the orientation or positional relationship usually put, be merely for convenience of description of the present invention and simplification of the description, rather than indicate or imply
Signified device or element must have a particular orientation, with specific azimuth configuration and operation, therefore should not be understood as to this
The limitation of invention.In addition, term " first ", " second ", " third " etc. are only used for distinguishing description, and it should not be understood as instruction or dark
Show relative importance.
In the description of the present invention, it is also necessary to which explanation is unless specifically defined or limited otherwise, term " setting ",
" installation ", " connected ", " connection " shall be understood in a broad sense, for example, it may be fixedly connected, may be a detachable connection or one
Connect to body；It can also be electrical connection；It can be directly connected, can also can be indirectly connected through an intermediary two
Connection inside element.For the ordinary skill in the art, above-mentioned term can be understood in the present invention with concrete condition
In concrete meaning.
An embodiment of the present invention provides a kind of image capturing systems 100, as shown in Figure 1.The image capturing system 100 wraps
It includes：Image capture module 110, image processing module 120 and network transmission module 130；Described image acquisition module 110 with it is described
Image processing module 120 connects, described image processing module 120 and the network transmission module 130.
Described image acquisition module 110 converts the LVDS signals received for receiving externally input LVDS signals
For 120 accessible digital signal of described image processing module.I.e. image capture module 110 is mainly responsible for the original LVDS letters of acquisition
Number, the original signal of acquisition is converted into digital signal that image processing module 120 can be read and carries out caching process.The figure
As acquisition module 110 can be LVDS image pick-up cards, in the present embodiment, it is preferable that the image capture module 110 includes FPGA
With DDR (DoubleDataRate).Wherein, FPGA uses Xlinx-Artix7 series processors, LVDS interface to use Artix7
Included high speed GTP transceivers, speed is up to 6.6Gb/s.FPGA is converted to externally input LVDS signals by GTP interfaces
120 manageable digital signal of image processing module.
Described image processing module 120 is used to carry out the LVDS signals read from described image acquisition module 110
Compression processing, and give compressed LVDS signal transmissions to the network transmission module 130.Further, image processing module
120 read transformed LVDS signals from described image acquisition module 110, and are carried out at compression to transformed LVDS signals
Then reason gives the compressed transformed LVDS signal transmissions to the network transmission module 130, realizes image data
Remote transmission.
In addition, described image processing module 120 is additionally operable to obtain characteristic from the LVDS signals read, and by institute
It states characteristic to analyse and compare with target data, obtains analysis result；And the analysis result is sent to the net
Network transmission module 130 realizes the remote monitoring of image.For example, crawl needs the number in the region paid close attention to from raw image data
It is compared according to target data or anticipatory data, judges whether image data is correct.
Wherein, described image processing module 120 includes IC chip, the processing capacity with signal.Above-mentioned collection
Can be at general processor, including central processing unit (Central Processing Unit, CPU), network at circuit chip
Manage device (Network Processor, NP) etc.；It can also be digital signal processor (Digital Signal
Processing, DSP), it is application-specific integrated circuit (Application Specific Integrated Circuit, ASIC), existing
At programmable gate array (Field Programmable Gate Array, FPGA) or other programmable logic device, discrete
Door or transistor logic, discrete hardware components.General processor can be microprocessor or the IC chip
It can also be any conventional processor etc..In the present embodiment, it is preferable that the image processing module 120 includes ARM.Wherein,
ARM uses STM32H7 family chips.ARM is attached using the FMC Peripheral Interfaces that STM32H7 family chips carry with FPGA.
Wherein, image processing module 120 is the number based on lossless compression algorithm to reading when being compressed to data
According to compression processing is carried out, for example, using MiniLZO or QuickLZ lossless compression algorithms.The algorithm committed memory is small, compression
Speed is fast.Wherein, ARM to the collected initial data of FPGA carry out lossless compression processing, can improve network transmission rate,
Reduce network-induced delay, while lossless compression can ensure the integrality of data.
The network transmission module 130 is used to compressed LVDS signal transmissions realizing image data to peripheral equipment
Remote transmission.In addition, the network transmission module 130 be additionally operable to by image processing module 120 to the LVDS signals that read into
Row is compared to be transferred out with the result after analyzing processing, to realize the remote monitoring of image.
Wherein, peripheral equipment can carry out data using identical decompression algorithm after the gathered data for receiving compression
Lossless decompression, then crawl needs the data in the region paid close attention to be carried out with target data or anticipatory data from raw image data
It compares, judges whether image data is correct, to realize the remote monitoring of image.
The network transmission module 130 can be based on wirelessly transmitting, and can also be to be transmitted based on wired mode.
When the network transmission module 130 is based on wired mode transmission data, as an alternative embodiment,
The network transmission module 130 includes PHY chip and network transformer, and described image processing module 120 sequentially passes through the PHY cores
Piece and the network transformer are connect with external network.
When the network transmission module 130 is based on wirelessly transmission data, which can be
WiFi module, ZigBee module, 3G module, 4G modules or other meet the wireless transport module of condition.For example, it may be
The 3G module of the models such as SIM6320C, CEM631, CEM600, WIDEM8800, FWP103, K3G, WM9881.
As an alternative embodiment, the image capturing system 100 further includes：First image buffer storage module, 140 He
Second image buffer storage module 150, as shown in Figure 2.Described first image cache module 140 and the second image buffer storage module
150 connect with described image acquisition module 110.
Described image acquisition module 110 is additionally operable to store transformed LVDS signals to described first image cache module
140, when determination has received the first frame image data, the second frame image data received is stored to second image and is delayed
Storing module 150 realizes the alternating caching of image data.That is it uses two image buffer storage modules to carry out ping-pong operation (to hand over
For caching), to prevent LVDS signals from Loss occur.For example, odd number frame data are stored to the first image buffer storage module 140,
Even number frame data are stored to the second image buffer storage module 150.
Described image acquisition module 110 is additionally operable to, when determination has received the first frame image data, handle to described image
Module 120 sends interrupt requests, and the current frame image data being stored in described first image cache module 140 are placed on certainly
The region to be read of body waits for described image processing module 120 to read.It transformed LVDS signals will store later to institute simultaneously
The second image buffer storage module 150 is stated, i.e., is stored up collected next frame image data to the second image buffer storage module 150.
That is, image capture module 110 is when collecting data, first by data buffer storage in the first image buffer storage module 140, when
When storing complete frame image in the first image buffer storage module 140, FPGA just gives ARM to send interrupt signal, and by the frame
Image data, which is placed in the region to be read (virtual SRAM) of itself, waits for ARM to read.Simultaneously by collected next frame figure
Picture data buffer storage is in the second image buffer storage module 150, when having received the second frame image data to determine, at described image
It manages module 120 and sends interrupt requests, and the current frame image data being stored in the second image buffer storage module 150 are placed on
The region to be read of itself waits for described image processing module 120 to read.
The first above-mentioned image buffer storage module 140 can be the same or different with the second image buffer storage module 150.As
A kind of optional embodiment, the first image buffer storage module 140 and the second image buffer storage module 150 can be a kind of integrated circuits
Chip has storage capacity.Above-mentioned IC chip may be, but not limited to, random access memory (Random
Access Memory, RAM), read-only memory (Read Only Memory, ROM), programmable read only memory
(Programmable Read-Only Memory, PROM), erasable read-only memory (Erasable Programmable
Read-Only Memory, EPROM), electricallyerasable ROM (EEROM) (Electric Erasable Programmable
Read-Only Memory, EEPROM), flash memory (Flash Memory) etc..In the present embodiment, it is preferable that first image is slow
Storing module 140 and the second image buffer storage module 150 are Double Data Rate synchronous DRAM (Double Data
Rate, DDR).
For the ease of understanding above-mentioned flow chart of data processing, can be understood in conjunction with schematic diagram shown in Fig. 3.Wherein scheme
3 illustrate only the flow that rough process flow is not whole.
Furthermore, it is necessary to explanation, which further includes power module, which mainly will be outer
Portion's input high-voltage DC power supply is converted to the required various low-voltage dc power supplies of the chips such as internal FPGA, ARM by DC-DC.
The embodiment of the present invention additionally provides a kind of image real time transfer side applied in above-mentioned image capturing system 100
Method, as shown in Figure 4.It is described below in conjunction with step shown in Fig. 4.
Step S101：Described image acquisition module receives externally input LVDS signals, and the LVDS signals received are turned
It is changed to the accessible digital signal of described image processing module.
Step S102：Described image processing module presses the LVDS signals read from described image acquisition module
Contracting is handled, and gives compressed LVDS signal transmissions to the network transmission module.
Step S103：The network transmission module is by compressed LVDS signal transmissions to peripheral equipment.
Described image acquisition system further includes：First image buffer storage module and the second image buffer storage module, the method is also
Including：Described image acquisition module stores transformed LVDS signals to described first image cache module, is received determining
When complete first frame image data, the second frame image data received is stored to the second image buffer storage module, realizes figure
As the alternating of data caches.
In addition, the method further includes：Described image acquisition module is when determination has received the first frame image data, to institute
It states image processing module and sends interrupt requests, and the current frame image data being stored in described first image cache module are put
Described image processing module is waited for read in the region to be read of itself；And determine when having received the second frame image data, to
Described image processing module sends interrupt requests, and will be stored in the second image buffer storage mould current frame image data in the block
Being placed on the region to be read of itself waits for described image processing module to read.
In addition, the method further includes：Described image processing module obtains characteristic from the LVDS signals read,
And the characteristic is analysed and compared with target data, obtain analysis result；And the analysis result is sent to
The network transmission module.
It should be noted that each embodiment in this specification is described in a progressive manner, each embodiment weight
Point explanation is all difference from other examples, and the same or similar parts between the embodiments can be referred to each other.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, any made by repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of image capturing system, which is characterized in that including：Image capture module, image processing module and network transmission mould
Block, described image acquisition module are connect with described image processing module, described image processing module and the network transmission module
Connection；
The LVDS signals received are converted to the figure by described image acquisition module for receiving externally input LVDS signals
As the accessible digital signal of processing module；
Described image processing module is used to carry out compression processing to the LVDS signals read from described image acquisition module, and
Give compressed LVDS signal transmissions to the network transmission module；
The network transmission module is used for compressed LVDS signal transmissions to peripheral equipment.
2. image capturing system according to claim 1, which is characterized in that further include：First image buffer storage module and
Two image buffer storage modules, described first image cache module and the second image buffer storage module with described image acquisition module
Connection；
Described image acquisition module is additionally operable to store transformed LVDS signals to described first image cache module, in determination
When having received the first frame image data, the second frame image data received is stored to the second image buffer storage module, it is real
The alternating caching of existing image data.
3. image capturing system according to claim 2, which is characterized in that described image acquisition module is additionally operable in determination
When having received the first frame image data, interrupt requests are sent to described image processing module, and described first image will be stored in
Current frame image data in cache module are placed on the region to be read of itself and described image processing module are waited for read；And
When determination has received the second frame image data, interrupt requests are sent to described image processing module, and described second will be stored in
Image buffer storage mould current frame image data in the block are placed on the region to be read of itself and described image processing module are waited for read.
4. according to claim 1-3 any one of them image capturing systems, which is characterized in that described image processing module is also
It analyses and compares with target data for obtaining characteristic from the LVDS signals read, and by the characteristic,
Obtain analysis result；And the analysis result is sent to the network transmission module.
5. image capturing system according to claim 4, which is characterized in that described image acquisition module include FPGA and
DDR, described image processing module include ARM, and the FPGA is connect with the FMC interfaces of the ARM.
6. image capturing system according to claim 4, which is characterized in that the network transmission module includes：PHY chip
And network transformer, described image processing module sequentially pass through the PHY chip and the network transformer and connect with external network
It connects.
7. a kind of image processing method, which is characterized in that it is applied to image capturing system, including：Image capture module, figure
As processing module and network transmission module；The method includes：
Described image acquisition module receives externally input LVDS signals, and the LVDS signals received are converted at described image
Manage the accessible digital signal of module；
Described image processing module carries out compression processing to the LVDS signals read from described image acquisition module, and will pressure
LVDS signal transmissions after contracting give the network transmission module；
The network transmission module is by compressed LVDS signal transmissions to peripheral equipment.
8. the method according to the description of claim 7 is characterized in that described image acquisition system further includes：First image buffer storage
Module and the second image buffer storage module, the method further include：
Described image acquisition module stores transformed LVDS signals to described first image cache module, has been received in determination
When the first frame image data, the second frame image data received is stored to the second image buffer storage module, realizes image
The alternating of data caches.
9. according to the method described in claim 8, it is characterized in that, the method further includes：
Described image acquisition module sends to interrupt to described image processing module and ask when determination has received the first frame image data
It asks, and the current frame image data being stored in described first image cache module is placed on the region to be read of itself and wait for institute
State image processing module reading；And determine when having received the second frame image data, send interruption to described image processing module
Request, and the second image buffer storage mould current frame image data in the block will be stored in and be placed on the region to be read waiting of itself
Described image processing module is read.
10. according to claim 7-9 any one of them methods, which is characterized in that the method further includes：
Described image processing module obtains characteristic from the LVDS signals read, and by the characteristic and number of targets
According to analysing and comparing, analysis result is obtained；And the analysis result is sent to the network transmission module.
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| CN113114993A (en) * | 2021-04-07 | 2021-07-13 | 南京云格信息技术有限公司 | Wireless image acquisition system based on FPGA |
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