CN1684024A - High speed video frequency collecting system - Google Patents
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- CN1684024A CN1684024A CN 200510055527 CN200510055527A CN1684024A CN 1684024 A CN1684024 A CN 1684024A CN 200510055527 CN200510055527 CN 200510055527 CN 200510055527 A CN200510055527 A CN 200510055527A CN 1684024 A CN1684024 A CN 1684024A
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Abstract
The present invention discloses a kind of high speed video acquisition system in image sensing and recording technology. The high speed video acquisition system consists of high speed video camera, computer and software, and adopts USB2.0 as digital video transmission protocol. The high speed video camera converts the light signal into digital video signal fed to the computer via USB2.0 data interface; and the computer sets the operation parameters of the high speed video camera by means of its software and acquires digital image from the high speed video camera for storing and operation. Adopting USB2.0 as digital video transmission protocol can omit PCI video acquisition card, and this results in optimized system structure, raised system reliability and lowered cost. The computer and the high speed video camera transmit data through one USB cable and this raises system flexibility and platform compatibility.
Description
Technical field
The invention belongs to image sensing and recording technique field, particularly a kind of high speed video frequency collecting system.
Background technology
The video formats that the most of video acquisition system in the present world is supported is a similarly standard system such as PAL and NTSC, and wherein the frame per second of pal mode is 25fps, and the frame per second of TSC-system formula is 30fps.The observation ability of these two kinds of standards and human eyes is suitable, is fit to human watching.When but the speed that takes place when incident exceeded the observation ability of human eye, write down and study such incident just can not be by the video acquisition system of human eye or normal video standard, and need be by high speed video frequency collecting system.The frame per second of high-speed video system can reach hundreds of fps even several thousand fps, can write down the image of high speed incident generating process, is the sharp weapon of research high speed incident.There is very important application in the high-speed video system in fields such as military affairs, space flight, material, manufacturing, biology.
High speed video frequency collecting system all has irreplaceable effect in a lot of fields.High speed video frequency collecting system the earliest should be a high speed film film photographic machine.High speed film film equipment heaviness, film can not be reused, and the shooting expense is very high, film need wash and could develop, take and show need between at regular intervals, and film photographic can not directly be sent into image data computing machine and carry out calculation process just to the record of image.These factors have limited the use of high-speed film greatly, and especially after the high speed video frequency collecting system appearance based on high-speed CCD, high-speed film does not re-use basically.The high-speed CCD video acquisition system have the speed height, highly sensitive, data directly can be sent into plurality of advantages such as Computer Processing.
In the development field of high speed video frequency collecting system, most of in the world high speed video frequency collecting systems are all taked the framework of high-speed camera+special-purpose PCI video frequency collection card+computing machine+special software at present.Canada DALSA company is famous CCD chip and ccd video camera design production firm, the high speed video frequency collecting system structural drawing that the CA-D1 high-speed camera of DALSA company and other assemblies constitute.System is made up of high-speed camera and computing machine and software, and system's frame per second can reach the RS-422 protocol transmission digital video signal that 843.95 CA-D1 systems adopt multidiameter delay, and RS-422 adopts difference modes, a pair of twisted-pair feeder of every road RS-422 signal demand.The pixel output rating of the CCD chip of CA-D1 is 15M pixel/s, and after 8 A/D conversion, the message transmission rate that needs interface is 120Mbits/s.The message transmission rate of single channel RS-422 is 10Mbits/s, so CA-D1 has adopted the pattern of multichannel RS-422 parallel transmission.This has just increased the quantity of CA-D1 external connection line greatly, adds control line, power supply etc., and the actual external connection of CA-D1 has 65.RS-422 is a kind of early stage interface electrical equipment standard, and voltage ratio is higher, and velocity ratio is lower.In recent years some new interface electrical equipment standards occurred as LVDS, CAMERA LINK etc., these agreements and RS-422 are differential signals from similar in essence, but voltage is lower, and speed is higher.Adopt this several interface standards, not too big difference of the framework of system and CA-D1 all will be introduced special-purpose capture card in system, and system cost increases, reliability reduces thereby cause.Because such system adopts the multichannel data parallel transmission, therefore inevitably in system, introduce a large amount of connecting lines simultaneously.
Summary of the invention
The purpose of this invention is to provide a kind of high speed video frequency collecting system, described high speed video frequency collecting system mainly is made of the pattern of high-speed camera, computing machine and software; It is characterized in that: in the described high speed video frequency collecting system of forming by high-speed camera, computing machine and software, adopt the host-host protocol of USB2.0 as digital video, its high-speed camera is made up of optical lens, driving circuit, vision signal pre-process circuit, A/D convertor circuit, USB2.0 data-interface, power supply, convert light signal to digital video, send into computing machine by the USB2.0 data-interface; On computer motherboard, be integrated with the USB2.0 interface; Described software comprises Windows driver, second development interface and application program, mainly is that the digital picture that high-speed camera internal running parameter, collection high-speed camera are set is stored and computing.
The invention has the beneficial effects as follows and adopt the host-host protocol of USB2.0 as digital video, the fundamentally framework of optimization system.In system, save video frequency collection card, thereby optimized system architecture, improved system reliability, reduced cost.While, control data and view data can be transmitted by USB2.0 owing to the employing of USB2.0 agreement is the high speed serial transmission mode.Therefore the data bus connection between computing machine and the high-speed camera also reduces to a USB cable from original tens, thereby has improved the dirigibility that system uses
Description of drawings
Fig. 1 is the structural representation of high speed video frequency collecting system.
The space multistory structural representation that Fig. 2 adopts for high-speed camera.
Fig. 3 is high-speed camera structural framing figure.
Embodiment
The invention provides a kind of high speed video frequency collecting system, described high speed video frequency collecting system all takes the pattern of high-speed camera, computing machine and software to constitute.Figure 1 shows that the structural representation of the high speed video frequency collecting system that adopts the USB2.0 agreement.Form by high-speed camera 1, computing machine 2 and software 3 three parts, in the described high speed video frequency collecting system, for to the taking all factors into consideration of factors such as performance, cost, complex interfaces degree, volume, external connection line quantity, this paper has adopted and has gathered the USB2.0 agreement that seldom adopt in the field at high-speed video at present.USB (Universal Serial Bus) is present popular interface protocol.The earlier version USB1.1 of USB, message transmission rate is very low, supports two kinds of transmission speeds, is respectively 12Mbps and 1.5Mbps.Just being applied to rate request is not very high serial transmission field.After but USB2.0 released, its message transmission rate was up to arriving 480Mbps, and making USB be applied to high speed data transfer becomes possibility.USB2.0 has become the Peripheral Interface standard that nearly all PC manufacturer supports.
As shown in Figure 1 and Figure 2, high-speed camera in the high speed video frequency collecting system is made up of optical lens 4, driving circuit 5, vision signal pre-process circuit 6, A/D convertor circuit 7, USB2.0 data-interface 8, power supply 9, convert light signal to digital video, send into computing machine 2 by USB2.0 data-interface 8; High-speed camera 1 is the most important component in the high speed video frequency collecting system, according to modular designing requirement, with high-speed camera be divided into following function independently submodule design respectively: CCD sensitive chip module 10; CCD driver module 5:CCD signal pre-processing module 6:USB2.0 interface module 8; Power module 9.The function of CCD master chip module is directly to support the work of CCD, as: drive signal level conversion, ccd signal amplification, CCD power filter etc.; The major function of CCD driver module is the driving logical signal that produces CCD logical drive signal and pre-process circuit; Ccd signal pretreatment module function is ccd signal to be carried out operations such as clamper, correlated-double-sampling, programmable-gain, AD conversion; The function of USB2.0 interface module provides the USB2.0 high speed interface with computing machine, according to the indication of computing machine high-speed camera is configured; The function of power module is to provide power supply and and extraneous plug receptacle for whole high-speed camera.Because the relation of CCD driver module and ccd signal pretreatment module is very tight, so these two modules are made on the same circuit board, other several modules are respectively made a circuit board respectively, and four circuit boards link together by connector, constitute a complete high-speed camera.In order to reduce the volume of high-speed camera, this paper has adopted a kind of special circuit space geometry.Four circuit boards are connected into a rectangular parallelepiped in the space, form one " circuit body ", the components and parts Surface Mount is at the surfaces externally and internally of rectangular parallelepiped.This structure has overcome all components and parts of circuit board and had in one plane taken large-area weakness, has guaranteed the efficient utilization in high-speed camera space, makes that the volume of camera is smaller and more exquisite (as shown in Figure 2).System debug and upgrading are convenient in this design.Four circuit boards can be debugged respectively according to function, and can upgrade or change certain module wherein future, and can not have influence on other modules.For example: can the module of USB2.0 be redesigned when needing, change the interface shape of high-speed camera, and do not need to change other modules.
In Fig. 3, the USB plate mainly is made up of MCU, CPLD# 2, FIFO and USB2.0 interface chip, and MCU is responsible for initialization USB2.0 interface chip, and controls signal of interests such as frame rate adjustment, startup.CPLD# 2 is responsible for receiving the Digital Image Data from AD converter, and data high-speed is write the USB2.0 interface chip.FIFO plays the data buffering effect between CPLD and the USB2.0 interface chip, to prevent loss of data.
Power panel not only provides power supply for high-speed camera, and the external combination hub of high-speed camera has been installed, and is respectively USB socket and 12V supply socket.One group of linear stabilized power supply is arranged on power panel, and this group linear stabilized power supply drives for respectively CCD plate, CCD and the pre-processed board power supply 12V power supply voltage stabilizing becoming 12V, 5V, the 3.3V of outside input.Power panel provides 5V power supply for the USB plate by USB interface.
On computing machine 2 mainboards, be integrated with USB2.0 interface 8; Described software 3 comprises Windows driver, second development interface and application program, mainly is that the digital picture that high-speed camera internal running parameter, collection high-speed camera are set is stored and computing.
Canada DALSA company is famous CCD chip and ccd video camera design production firm.The ccd sensor that this paper adopts is exactly the CCD chip product (model: IA-D1) of the said firm.DALSA is except providing the CCD chip, and itself also produces the CCD camera.
The photoelectric sensor that the high speed video frequency collecting system of this paper invention and CA-D1 adopt is same model IA-D1, and this paper system compares with CA-D1 has following characteristics:
| This paper THSVCS-1 | The CA-D1 of Canada DALSA company | |
| The highest frame per second | ????843.95fps | ????736fps |
| Computer interface | Integrated USB2.0 interface | Special-purpose RS422 PCI image pick-up card |
| Extensibility | Independent development | Technical know-how can not be revised |
| Cost and price | Less than 20,000 yuans (costs) | 150,000 yuans (price) |
| Camera weight | Less than 0.5Kg | ????0.7Kg |
| Size | ????56.0mm×52.0mm×89.0mm | ????88.9mm×88.9mm×82.6mm |
| The |
1 USB cable+2 power lead | 65 |
| The running software platform | ????Windows98/2000/XP/2003 | ????Windows98/NT4.0/2000/ |
Compare with the CA-D1 of Canadian DALSA company, THSVCS-1 obviously has: the frame per second height, volume is little, in light weight, interface is general, aerial lug is few, overall cost is low, the compatible characteristics such as good of platform.
Claims (2)
1. high speed video frequency collecting system, described high speed video frequency collecting system mainly is made of the pattern of high-speed camera, computing machine and software; It is characterized in that: in the high speed video frequency collecting system of forming by high-speed camera, computing machine and software, adopt the host-host protocol of USB 2.0 as digital video, its high-speed camera is made up of optical lens, driving circuit, vision signal pre-process circuit, A/D convertor circuit, USB2.0 data-interface, power supply, convert light signal to digital video, send into computing machine: on computer motherboard, be integrated with the USB2.0 interface by the USB2.0 data-interface.
2. according to the described high speed video frequency collecting system of claim 1, it is characterized in that: described software comprises Windows driver, second development interface and application program, mainly is that the digital picture that high-speed camera internal running parameter, collection high-speed camera are set is stored and computing.
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| CN 200510055527 CN1684024A (en) | 2005-03-16 | 2005-03-16 | High speed video frequency collecting system |
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| CN 200510055527 CN1684024A (en) | 2005-03-16 | 2005-03-16 | High speed video frequency collecting system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101662674B (en) * | 2009-09-09 | 2012-07-04 | 汕头市超声仪器研究所有限公司 | Video data transmission method |
| CN104853077A (en) * | 2015-05-27 | 2015-08-19 | 周毅 | Broadcast-quality high-speed high-definition camera |
| CN106791319A (en) * | 2016-12-30 | 2017-05-31 | 广州华友明康光电科技有限公司 | A kind of high definition medical treatment camera module |
| CN107809635A (en) * | 2011-11-14 | 2018-03-16 | 深圳迈辽技术转移中心有限公司 | Information carrying means |
-
2005
- 2005-03-16 CN CN 200510055527 patent/CN1684024A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101662674B (en) * | 2009-09-09 | 2012-07-04 | 汕头市超声仪器研究所有限公司 | Video data transmission method |
| CN107809635A (en) * | 2011-11-14 | 2018-03-16 | 深圳迈辽技术转移中心有限公司 | Information carrying means |
| CN104853077A (en) * | 2015-05-27 | 2015-08-19 | 周毅 | Broadcast-quality high-speed high-definition camera |
| CN106791319A (en) * | 2016-12-30 | 2017-05-31 | 广州华友明康光电科技有限公司 | A kind of high definition medical treatment camera module |
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