CN204929048U - Video image acquisition system - Google Patents
Video image acquisition system Download PDFInfo
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- CN204929048U CN204929048U CN201520511970.8U CN201520511970U CN204929048U CN 204929048 U CN204929048 U CN 204929048U CN 201520511970 U CN201520511970 U CN 201520511970U CN 204929048 U CN204929048 U CN 204929048U
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Abstract
The utility model discloses a video image acquisition system, including the input interface, the wave filter, the decoder, operational amplifier, synchronous separating module and image processing module, wave filter and decoder are connected respectively to the input interface, the decoder is still connected respectively to the wave filter, operational amplifier and synchronous separating module, operational amplifier still connects AD conversion module, AD conversion module still connects crystal oscillator and CPLD module respectively, synchronous separating module is still connected respectively to the CPLD module, crystal oscillator and image processing module, image processing module still connects the output interface. The utility model discloses a DSP's piece is gone up ADC and is realized image acquisition, does not need the video decoding chip of specialty, has that the circuit is simple, with low costs, characteristics of easy to maintain and upgrading, its collection that can adapt to different standard image signal of more importantly, and when buildding data acquisition system with DSP and CPLD, complicated hardware design has been avoided to image acquisition chip that needn't external specialty, provides sufficient throughput simultaneously.
Description
Technical field
The utility model relates to a kind of acquisition system, specifically a kind of Video Image Collecting System Based.
Background technology
Fast-developing automobile industry is that vehicle electronics product provides wide application market, as video surveillance devices such as vehicle-mounted " infrared surveillances ", " radar for backing car ", for driver had both brought conveniently, also brings safety.These surveillance equipments be unable to do without video image acquisition, and the key link of video image acquisition is exactly the AD conversion of picture signal.Traditional Video Image Collecting System Based generally adopts special image collection chip, as SAA7110 video decoding chip, automatically completes the collection of image; Shortcoming is that circuit is complicated, cost is high, inconveniently carries out software programming and upgrading to it, and then it gathers the precision of image and speed is also restricted, bad to non-standard image signal adaptability.
Utility model content
The purpose of this utility model is to provide ADC on the sheet of a kind of DSP of employing to realize the Video Image Collecting System Based of IMAQ, to solve the problem proposed in above-mentioned background technology.
For achieving the above object, the utility model provides following technical scheme:
A kind of Video Image Collecting System Based, comprise input interface, filter, decoder, operational amplifier, separated in synchronization module and image processing module, described input interface connects filter and decoder respectively, filter also connects decoder respectively, operational amplifier and separated in synchronization module, operational amplifier also connects A/D modular converter, A/D modular converter also connects crystal oscillator and CPLD module respectively, CPLD module also connects separated in synchronization module respectively, crystal oscillator and image processing module, image processing module also connects output interface, described A/D converter adopts TMS320F2812.
As further program of the utility model: described filter adopts TDA9181.
As further program of the utility model: described decoder adopts TDA9143.
As further program of the utility model: described image processing module adopts TMS320C6416T.
As the utility model further scheme: described separated in synchronization module adopts LM1881.
Compared with prior art, the beneficial effects of the utility model are: the utility model adopts ADC on the sheet of DSP to realize IMAQ, do not need the video decoding chip of specialty, have the advantages that circuit is simple, cost is low, be easy to maintenance and upgrading, the more important thing is that it can adapt to the collection of various criterion picture signal, when building data acquisition system with DSP and CPLD, need not the image collection chip of external specialty, avoid complicated hardware designs, provide enough disposal abilities simultaneously.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of Video Image Collecting System Based.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Refer to Fig. 1, in the utility model embodiment, a kind of Video Image Collecting System Based, comprise input interface, filter, decoder, operational amplifier, separated in synchronization module and image processing module, input interface connects filter and decoder respectively, filter also connects decoder respectively, operational amplifier and separated in synchronization module, operational amplifier also connects A/D modular converter, A/D modular converter also connects crystal oscillator and CPLD module respectively, CPLD module also connects separated in synchronization module respectively, crystal oscillator and image processing module, image processing module also connects output interface, described A/D converter adopts TMS320F2812.
Filter adopts TDA9181.
Decoder adopts TDA9143.
Image processing module adopts TMS320C6416T.
Separated in synchronization module adopts LM1881.
Operation principle of the present utility model is: first carry out synchronizing signal separation to the picture signal obtained, the synchronizing signal separated is connected to CPLD module.Picture signal, after the preliminary treatment such as clamping, amplitude adjustment, is connected to the ADC input of TMS320F2812.TMS320F2812 exports the result of ADC on its sheet to CPLD module by XINTF, and video brightness signal is transferred to image processor TMS320C6416T by HPI according to the sequential relationship of isolated synchronizing signal and carries out image procossing by CPLD module.
Video pre-filtering: include video brightness signal, chroma video signal, video synchronization signal in analog picture signal.The peak-to-peak value of picture signal is 1V, and its sync signal level is lower than zero level, and the ADC range that TMS320F2812 adopts is 0 ~ 3V, therefore before Video Quality Metric, need to carry out the preliminary treatment such as Y/C separation, separated in synchronization, clamping, amplitude amplification to it.
Y/C is separated and clamping: native system adopts TDA9181 with TDA9143 chip to carry out Y/C and is separated, TDA9181 is the dynamic comb filter of many standards, be made up of time delay, adder, subtracter, band pass filter, support that the comb of PALB, G, H, D, I, M, N and NTSCM standard is whole, can carry out Y/C separation for the picture signal of its relevant standard, TDA9181 can also carry out clamping to the signal of input.TDA9143 is a kind of PAL/NTSC/SECAM decoder by I2C bus marco, can for TDA9181 provide Y/C be separated required for SAND signal and look subcarrier frequency signal.
Operational amplifier: the peak-to-peak value due to picture signal is 1V, and the ADC range of TMS320F2812 is 0 ~ 3V, so in order to better carry out video sampling, need to amplify 3 times to picture signal, the AD8066 that system adopts be high pressure, at a high speed, the single channel that exports of the track to track of low-power consumption and big current and two-way operational amplifier, its differential gain error and differential phase error be respectively 0.01% and the flatness of 0.02%, 7MHz bandwidth be 0.1dB, be applicable to very much video buffer application.
Separated in synchronization module: separated in synchronization adopts the LM1881 chip of NS company, PAL, NTSC that LM1881 can be 0.5 ~ 2V from peak-to-peak value are separated out various synchronizing signal in addition with SECAM picture signal, and LM1881 also can be applicable to the separated in synchronization of non-standard image signal.
A/D modular converter: TMS320F2812 is 32 fixed point programmable processor chips, highest frequency is 150MHz, can be connected with other processors easily, on sheet, 12 the highest sampling bandwidth of ADC can reach 12.5MHz, have the FIFO being equivalent to 16 grades, make ADC on sheet can reach upper limit operation speed, realize every 80ns and gather 1 data.In addition, TMS320F2812 can carry out software programming easily, to adapt to the picture signal of various criterion, therefore adopts TMS320F2812 to be used as AD conversion.By the analog picture signal of the PAL/NTSC standard of input by TDA9181 with TDA9143 carry out Y/C be separated and clamping after, a road becomes digital signal to TMS320F2812, and synchronizing signal is isolated to LM1881 in another road.
View data after being gathered by TMS320F2812 transfers to CPLD module by its XINTF; LM1881 is isolated parity field signal and composite synchronizing signal also to give CPLD module and carry out logic control, decided to gather strange field picture or even field picture according to parity field signal and composite synchronizing signal by CPLD module, or gather the complete image of a frame.
When field sync signal arrives, CPLD module is gather strange field picture or even field picture according to parity field signal deciding, or gathers the complete image of a frame; When composite synchronizing signal arrives, it is which that CPLD module judges.CPLD module can according to the collection of these logical sequence control TMS320F2812, and provide synchronous sequence to the image processor extended out, user also can according to oneself need process these synchronizing signals, such as replace CPLD module to judge row, the field of image with the image processor that extends out.
To those skilled in the art, obvious the utility model is not limited to the details of above-mentioned one exemplary embodiment, and when not deviating from spirit of the present utility model or essential characteristic, can realize the utility model in other specific forms.Therefore, no matter from which point, all should embodiment be regarded as exemplary, and be nonrestrictive, scope of the present utility model is limited by claims instead of above-mentioned explanation, and all changes be therefore intended in the implication of the equivalency by dropping on claim and scope are included in the utility model.Any Reference numeral in claim should be considered as the claim involved by limiting.
In addition, be to be understood that, although this specification is described according to execution mode, but not each execution mode only comprises an independently technical scheme, this narrating mode of specification is only for clarity sake, those skilled in the art should by specification integrally, and the technical scheme in each embodiment also through appropriately combined, can form other execution modes that it will be appreciated by those skilled in the art that.
Claims (5)
1. a Video Image Collecting System Based, comprise input interface, filter, decoder, operational amplifier, separated in synchronization module and image processing module, it is characterized in that, described input interface connects filter and decoder respectively, filter also connects decoder respectively, operational amplifier and separated in synchronization module, operational amplifier also connects A/D modular converter, A/D modular converter also connects crystal oscillator and CPLD module respectively, CPLD module also connects separated in synchronization module respectively, crystal oscillator and image processing module, image processing module also connects output interface, described A/D converter adopts TMS320F2812.
2. Video Image Collecting System Based according to claim 1, is characterized in that, described filter adopts TDA9181.
3. Video Image Collecting System Based according to claim 1, is characterized in that, described decoder adopts TDA9143.
4. Video Image Collecting System Based according to claim 1, is characterized in that, described image processing module adopts TMS320C6416T.
5. Video Image Collecting System Based according to claim 1, is characterized in that, described separated in synchronization module adopts LM1881.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520511970.8U CN204929048U (en) | 2015-07-14 | 2015-07-14 | Video image acquisition system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520511970.8U CN204929048U (en) | 2015-07-14 | 2015-07-14 | Video image acquisition system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106231264A (en) * | 2016-08-10 | 2016-12-14 | 哈尔滨理工大学 | A kind of farmland image capturing system |
| CN106412382A (en) * | 2016-11-20 | 2017-02-15 | 广西大学 | Electronic information signal processing system |
| CN106534865A (en) * | 2016-11-04 | 2017-03-22 | 天津大学 | JPEG2000 collection compression board based on ADV212 |
| CN109031012A (en) * | 2018-05-24 | 2018-12-18 | 国网四川省电力公司宜宾供电公司 | A kind of automatic Testing Alarm System and method based on UWB technology |
-
2015
- 2015-07-14 CN CN201520511970.8U patent/CN204929048U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106231264A (en) * | 2016-08-10 | 2016-12-14 | 哈尔滨理工大学 | A kind of farmland image capturing system |
| CN106534865A (en) * | 2016-11-04 | 2017-03-22 | 天津大学 | JPEG2000 collection compression board based on ADV212 |
| CN106412382A (en) * | 2016-11-20 | 2017-02-15 | 广西大学 | Electronic information signal processing system |
| CN109031012A (en) * | 2018-05-24 | 2018-12-18 | 国网四川省电力公司宜宾供电公司 | A kind of automatic Testing Alarm System and method based on UWB technology |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151230 Termination date: 20170714 |
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| CF01 | Termination of patent right due to non-payment of annual fee |