CN1642259A - Method for converting video-frequency signal format - Google Patents
Method for converting video-frequency signal format Download PDFInfo
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- CN1642259A CN1642259A CN 200410015194 CN200410015194A CN1642259A CN 1642259 A CN1642259 A CN 1642259A CN 200410015194 CN200410015194 CN 200410015194 CN 200410015194 A CN200410015194 A CN 200410015194A CN 1642259 A CN1642259 A CN 1642259A
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Abstract
The invention is a video signal format converting method, including the steps as follows: 1) identifying input format of horizontal and vertical signals separated by A/D converter; 2) then arranging the corresponding sampling frequencies, picture clamping positions and sampling phases, etc., for different signals, making A/D converter output accurate digital picture signals and arranging sampling clock of a digital picture processing chip to synchronize with the before-mentioned clock and locking the phase; 3) in the digital picture chip, adopting a mode of displaying based on picture storage and sampling without locking the phase, and making it able to display different formats of signals after processed at the same horizontal or vertical frequency by arranging different proportion factors of horizontal-vertical conversion. The method is easy to be compatible with various traditional video signal formats and various high-definition video signal formats.
Description
[technical field]
The invention relates to TV domain, especially about a kind of conversion method of video signal format.
[background technology]
At present, there is multiple format standard in the TV programme in the whole world, comprises traditional PAL, NTSC, SECAM, and signal formats such as 1080i@50HZ, the 1080i@60HZ of high definition, 720P, and the program source that makes the user obtain may be the signal of different-format.Low frequency low-bandwidth signals such as the most energy of present TV compatible PAL, NTSC, SECAM.And,, think that compatible full format has more technological difficulties because several format differences are big for high-definition signal.For various video signal formats, the scanning of TV domain mainly contains following several application mode:
1. the 15K line frequency interlacing scan of conventional form: advantage is that scan pattern realizes easily, and cost is low, good reliability.Shortcoming is that capable rustic is arranged, and field rate flicker is creeped etc.Especially obvious when particularly being applied in the picture tube more than 29 inches.
2.100HZ scanning: this be since the mid-90 be with the Philips representative for eliminating a kind of scanning technique that field rate flicker adopts, this scheme adopts digital technology that image is stored, and scan with 2 times of frequencies to the input signal line frequency, guaranteeing under the constant situation of every field signal line number field frequency to be become 100HZ by 50HZ, thereby eliminated the large tracts of land field rate flicker, and can support the VGA input.But its shortcoming is a row rustic problem still not to be resolved.
3. line by line scan: this technology starts from the end of the nineties, and this technology type is similar to the 100HZ technology, but what change is every line number, eliminated the phenomenon of capable rustic, make image become fine and smooth, also can support the VGA input, but large tracts of land field rate flicker problem is not resolved.
4. variable-frequency scanning: this is these 2 years new technologies of just rising.This technology is that the PAL conversion of signals with the 50HZ field frequency is the 60HZ field frequency and handles output simultaneously line by line, and this technology can solve the insurmountable capable rustic of traditional tv scan mode simultaneously, field rate flicker, shortcoming such as creep.
HD digital TV class: because the standard of HD digital TV is different from the standard of conventional television signal, the television set of above-mentioned several scan modes all can not be watched the HD digital TV signal.The HD digital TV also has several classes: 1080i60HZ, 1080i50HZ, 720P etc., 1080i60HZ is adopted in Japan, the U.S., Europe, there is the HD digital TV of the 1080i60HZ that pilots in China part city, but China will adopt 1080i50HZ as China's HD digital television standard in the future.At present China is used to watch that the television set of Digital Television adopts multirow mode frequently more, and this multirow frequently mode realize difficulty, the cost height, reliability is relatively poor, thereby the Digital Television of each producer holds at high price, thereby has also influenced the popularization of China's Digital Television.
[summary of the invention]
The object of the present invention is to provide the conversion method of the video signal format of compatible various conventional video signals of a kind of energy and high-definition format video.
The object of the present invention is achieved like this: the conversion method of this a kind of video signal format is that different video signal formats is converted to digital signal corresponding, then this digital signal is converted to the vision signal with single line frequency or field frequency.
Described method comprises identification step a), and it is that the row field signal that analog to digital converter separates is carried out the identification of input signal format.
Also comprise step b) after the described step a): it is that different signals is provided with corresponding sampling parameters, thereby makes the correct digital video signal of analog to digital converter output.
Also comprise step c) after the described step b): it is by the vision signal process chip corresponding sampling clock to be set, the sampling clock of this clock and analog to digital converter is also phase-locked synchronously, and different video signal formats is converted to the single line frequency or the video signal format of field frequency.
The vision signal of single line frequency or field frequency is stored in the frame memory.
Also comprise step d) after the described step c): it is the digital signal with after treatment, by video display chip being provided with the scale factor of a different read clocks and row conversion, and shows with single line frequency or field frequency.
Be by the scale factor of a different read clocks and row conversion is set during the conversion of described vision signal, and different video signal formats is converted to identical line frequency or field frequency.
Described video display chip adopts based on the demonstration of image storage and the not phase-locked method of sampling.
Compared with prior art, the present invention has following advantage: this method is converted to single line frequency by the vision signal with different-format or field frequency shows, so can compatible various traditional video signal formats and various high-definition video signal form.
[description of drawings]
Fig. 1 is the schematic diagram of signal processing flow of the present invention.
[embodiment]
See also Fig. 1, the conversion method of a kind of video signal format of the present invention is to be the display mode that display device is supported with traditional video signal format and various high-definition video signal format conversion, and it is that various vision signal is converted to single line frequency or field frequency.The concrete steps of this method are as follows: 1) row field signal that separates with analog to digital converter is carried out the identification of pattern of the input; 2) then different signals is provided with corresponding sample frequency, picture clamping positions and sampling phase etc., make the correct digital image signal of digital to analog converter output, and the sampling clock of the Digital Image Processing chip in the digital video modular converter is set, make and aforesaid clock synchronization and phase-locked, and each vision signal is converted to single line frequency or field frequency signal; 3) in the digital video display chip of digital video modular converter, employing is based on the demonstration and the not phase-locked mode of sampling of image storage, by show different demonstrations all the time, the scale factor of a row conversion, make that can handle the back to the different-format signal shows with a kind of identical line frequency or field frequency.
The circuit module of the TV of this method correspondence mainly contains three tunnel signalling channels:
1. for traditional television video frequency signal (, reaching DVD component YUV signal), it is decoded as digital YUV signal, gives the Digital Video Processing chip then with existing Video Decoder as composite video CVBS, S terminal signals.
2. the high-definition signal (1080i@50HZ, 1080i@60HZ, 720P) for various YPbPr reaches DVD signal process high accuracy, high speed analog-to-digital conversion (A/D) process chip (model is 9883) line by line, be converted to digital YUV signal, then give the Digital Video Processing chip.
For the computer shows signal (VGA, SVGA, XGA) of the high-definition signal (1080i@50HZ, 1080i@60HZ, 720P) of various RGB terminals, DVD signal and PC output line by line through high accuracy, high speed analog-to-digital conversion (A/D) process chip (model is 9883), be converted to digital YUV signal, then give the Digital Video Processing chip.
This three tunnel signalling channel is switched by existing passage diverter switch, it is the road signal of selecting in the multichannel input signal wherein by being controlled at, this moment, selected signal one tunnel was in connected state, and other not selected input signal is in dissengaged positions.
For traditional vision signal, because signal bandwidth is lower, analog-to-digital sample frequency is 13.5MHz, and since existing digital image decoding device all integrated corresponding analog to digital converter, data volume is less, thereby is easy to handle.
But for high-definition signal, its signal bandwidth height, the data sampling frequency that requires is not less than 74.25MHz, must just can meet the demands with the high speed analog-to-digital conversion process chip,, must select for use high performance Digital Image Processing chip just can handle accordingly because data volume is big, simultaneously, because various high-definition signal form difference are big, various forms are discerned rapidly and accurately and done different processing soft, thereby software is also had very high requirement.
For high definition 1080i@50HZ signal, owing to when the large tracts of land high brightness shows, can have the field rate flicker problem, mainly be to carry out the conversion of field frequency, the method by non-linear interframe interpolation realizes by the conversion of 50HZ to 60HZ, for high definition 1080i@60HZ signal, then only carry out image and further promote processing, as edge lifting, γ correction etc., and for the 720P signal, because its line frequency very high (45KHZ), mainly be the conversion of line frequency, be converted to the frequency (34KHZ is following) that is easy to show.The data volume of these high-definition signals is all very big, and SDRAM is required to be not less than 32, and frequency is not less than 100MHZ.
The method of this nonlinear interframe interpolation is meant the production method of 6 new in to 50HZ commentaries on classics 60HZ process two field pictures, be that new the 1st, 2,3 frames are constant, the 4th two field picture carries out interpolation by the 3rd original frame and the 4th two field picture according to the image motion characteristic value and produces, the 5th new two field picture is weighted interpolation by the 4th original frame and the 5th two field picture according to the image motion characteristic value and produces, the 6th new two field picture is weighted interpolation by the 5th original frame and the 5th new two field picture according to the image motion characteristic value and produces, thereby realizes by the conversion of 50HZ to 60HZ.
Like this, the control with algorithm of selecting for use by device can realize the signal of different frequency is handled with circuit kit, has both realized the full compatibility to various vision signals of tradition and various high-definition formats, does not increase hardware cost again, and good reliability is arranged.
Claims (8)
1. the conversion method of a video signal format is characterized in that: different video signal formats is converted to digital signal corresponding, then this digital signal is converted to the vision signal with single line frequency or field frequency.
2. the conversion method of a kind of video signal format as claimed in claim 1, it is characterized in that: described method comprises identification step a), it is that the row field signal that analog to digital converter separates is carried out the identification of input signal format.
3. the conversion method of a kind of video signal format as claimed in claim 2, it is characterized in that: also comprise step b) after the described step a): it is that different signals is provided with corresponding sampling parameters, thereby makes the correct digital video signal of analog to digital converter output.
4. the conversion method of a kind of video signal format as claimed in claim 3, it is characterized in that: also comprise step c) after the described step b): it is by the vision signal process chip corresponding sampling clock to be set, the sampling clock of this clock and analog to digital converter is also phase-locked synchronously, and different video signal formats is converted to the single line frequency or the video signal format of field frequency.
5. the conversion method of a kind of video signal format as claimed in claim 4 is characterized in that: will be used for single line frequency or the field frequency video signal displayed is stored in the frame memory.
6. as the method for the conversion of claim 4 or 5 described a kind of video signal formats, it is characterized in that: also comprise step d) after the described step c): it is the digital signal with after treatment, by being the scale factor that video display chip is provided with different read clocks and a row conversion, and show with single line frequency or field frequency with digital signal.
7. the conversion method of a kind of video signal format as claimed in claim 6, it is characterized in that: be by the scale factor of a different read clocks and row conversion is set during the conversion of described vision signal, and different video signal formats is converted to identical line frequency or field frequency.
8. the method for the conversion of a kind of video signal format as claimed in claim 6 is characterized in that: demonstration and the not phase-locked method of sampling that described video display chip employing is stored based on image.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100151949A CN100493171C (en) | 2004-01-17 | 2004-01-17 | Method for converting video-frequency signal format |
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| CNB2004100151949A CN100493171C (en) | 2004-01-17 | 2004-01-17 | Method for converting video-frequency signal format |
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| CN1642259A true CN1642259A (en) | 2005-07-20 |
| CN100493171C CN100493171C (en) | 2009-05-27 |
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| CNB2004100151949A Expired - Fee Related CN100493171C (en) | 2004-01-17 | 2004-01-17 | Method for converting video-frequency signal format |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100464567C (en) * | 2005-02-04 | 2009-02-25 | 董涛 | Integrated video-frequency siganl exchanging apparatus and method |
| CN1917575B (en) * | 2006-09-07 | 2011-05-25 | 康佳集团股份有限公司 | Method for switching image display formats of digital display |
| CN101068334B (en) * | 2007-01-30 | 2011-07-13 | 宝利微系统控股公司 | Visual frequency image digital processing chip and Dip integrated circuit packaging the same chip |
| CN101572826B (en) * | 2008-04-29 | 2011-07-13 | 深圳迈瑞生物医疗电子股份有限公司 | Ultrasonic video display device and method |
| CN105975419A (en) * | 2016-04-27 | 2016-09-28 | 北京小鸟看看科技有限公司 | Displayport interface and clock recovery method therefor |
| WO2020020149A1 (en) * | 2018-07-25 | 2020-01-30 | 杭州海康威视数字技术股份有限公司 | Method and device for video signal identification, electronic device, and readable storage medium |
| CN110769176A (en) * | 2018-07-25 | 2020-02-07 | 杭州海康威视数字技术股份有限公司 | Video signal type identification method and device, electronic equipment and readable storage medium |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100225072B1 (en) * | 1996-12-18 | 1999-10-15 | 윤종용 | Format converter |
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2004
- 2004-01-17 CN CNB2004100151949A patent/CN100493171C/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100464567C (en) * | 2005-02-04 | 2009-02-25 | 董涛 | Integrated video-frequency siganl exchanging apparatus and method |
| CN1917575B (en) * | 2006-09-07 | 2011-05-25 | 康佳集团股份有限公司 | Method for switching image display formats of digital display |
| CN101068334B (en) * | 2007-01-30 | 2011-07-13 | 宝利微系统控股公司 | Visual frequency image digital processing chip and Dip integrated circuit packaging the same chip |
| CN101572826B (en) * | 2008-04-29 | 2011-07-13 | 深圳迈瑞生物医疗电子股份有限公司 | Ultrasonic video display device and method |
| CN105975419A (en) * | 2016-04-27 | 2016-09-28 | 北京小鸟看看科技有限公司 | Displayport interface and clock recovery method therefor |
| CN105975419B (en) * | 2016-04-27 | 2019-08-20 | 北京小鸟看看科技有限公司 | A kind of Displayport interface and its method of clock recovery |
| WO2020020149A1 (en) * | 2018-07-25 | 2020-01-30 | 杭州海康威视数字技术股份有限公司 | Method and device for video signal identification, electronic device, and readable storage medium |
| CN110769176A (en) * | 2018-07-25 | 2020-02-07 | 杭州海康威视数字技术股份有限公司 | Video signal type identification method and device, electronic equipment and readable storage medium |
| CN110769176B (en) * | 2018-07-25 | 2022-01-25 | 杭州海康威视数字技术股份有限公司 | Video signal type identification method and device, electronic equipment and readable storage medium |
| US11930158B2 (en) | 2018-07-25 | 2024-03-12 | Hangzhou Hikvision Digital Technology Co., Ltd. | Video signal identification method and apparatus, electronic device and readable storage medium |
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| Publication number | Publication date |
|---|---|
| CN100493171C (en) | 2009-05-27 |
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