CN103945195A - Camera conversion circuit of vehicle-mounted night vision system and signal processing method of camera conversion circuit - Google Patents
Camera conversion circuit of vehicle-mounted night vision system and signal processing method of camera conversion circuit Download PDFInfo
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- CN103945195A CN103945195A CN201410182203.7A CN201410182203A CN103945195A CN 103945195 A CN103945195 A CN 103945195A CN 201410182203 A CN201410182203 A CN 201410182203A CN 103945195 A CN103945195 A CN 103945195A
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- 230000004297 night vision Effects 0.000 title claims abstract description 19
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Abstract
The invention discloses a camera conversion circuit of a vehicle-mounted night vision system and a signal processing method of the camera conversion circuit. The conversion circuit comprises an image acquisition unit, a main control chip and a display module, wherein the main control chip is used for acquiring image signals according to the image acquisition unit and displaying the processed data on the display module; the image acquisition unit is sequentially connected with the main control chip through a first conversion module and a second conversion module; data transmission is performed between the first conversion module and the second conversion module through a differential line, the first conversion module is used for converting 8-bit parallel video data acquired by the image acquisition module to differential digital video data, the differential digital video data is converted to a 8-bit parallel video and is input to the main control chip through the second conversion module, and the data processing is performed by the main control chip. The camera conversion circuit provided by the invention has the advantages of performing signal conversion through the first conversion module and the second conversion module, so as to realize long-distance transmission.
Description
Technical field
The present invention relates to on-vehicle night vision systems technology, particularly a kind of on-vehicle night vision system camera change-over circuit and signal processing method thereof.
Background technology
On-vehicle night vision camera select time, should consider cost consider to be again convenient to install.General circuit adopts CMOS camera to carry out IMAQ, although cost is lower than CCD camera, because the digital signal of CMOS camera output is 8, is not suitable for long-distance transmissions, is therefore unfavorable for the installation of camera.
Summary of the invention
Technical problem to be solved by this invention is, for the deficiencies in the prior art, to provide a kind of on-vehicle night vision system camera change-over circuit and signal processing method thereof of applicable camera long-distance transmissions.
For solving the problems of the technologies described above, technical scheme of the present invention is: a kind of on-vehicle night vision system camera change-over circuit, comprises image acquisition units, main control chip, display module;
Described main control chip, for the picture signal gathering according to image acquisition units, is shown in after deal with data on display module;
Described image acquisition units is connected with described main control chip by the first modular converter, the second modular converter successively.
Described image acquisition units is CMOS camera or CCD camera.
Between the first described modular converter and the second modular converter, carry out transfer of data by differential lines.
Described the first modular converter, for being converted to differential digital video data by 8 parallel-by-bit video datas of image acquisition units collection;
Described differential digital video data is converted to 8 parallel-by-bit video inputs in main control chip by the second modular converter, and carries out data processing by main control chip.
Described the first modular converter adopts chip U3, and its model is DS92LV1021, and described the second modular converter adopts chip U2, and its model is DS92LV1212.
The 27th of described chip U3, 28 pins access respectively 3.3V power supply, and be connected with two capacitor C 8 and C9 in parallel, the 25th of described chip U3, 26 pins access respectively 3.3V power supply, and be connected with two capacitor C 10 and C11 in parallel, the 23rd of described chip, 24 pins access 3.3V power supply by resistance R 3 respectively, the 1-12 pin of described chip U3 connects image input signal, the 13rd pin of chip U3 is by resistance R 7 ground connection, the 14th pin of chip U3 is connected with the OUT pin of active crystal resonator, on described active crystal resonator, be provided with EN pin, VCC pin, OUT pin and GND pin, between the OUT pin of described active crystal resonator and VCC pin, be provided with resistance R 6 and access 3.3V power supply, the 22nd of chip U3, 21 pins respectively with the 5th of chip U2, 6 pins connect.
15-19 pin, the 24-28 pin of described chip U2 are output pin, the 2nd pin of chip U2 accesses 3.3V power supply by resistance R 1, the 3rd pin of chip U2 is connected with the OUT pin of crystal oscillating circuit, the 7th pin of chip U2 accesses 3.3V power supply by resistance R 5, the 8th pin of chip U2 is accessed 3.3V power supply, is passed through capacitor C 2 ground connection by resistance R 4 respectively, and the 9th pin of chip U2 is by capacitor C 3 ground connection.
A signal processing method for on-vehicle night vision system camera change-over circuit, is characterized in that: described method comprises the following steps:
A) quotation marks that change-over circuit gathers CMOS camera by chip U3 input to this chip through input pin 1-12,8 parallel-by-bit video datas are converted to differential digital video data by this chip, the signal after conversion transmitted through differential lines by RI+ and the RI-pin of pin DO+ and DO-and chip U2;
B) differential signal is converted to 8 parallel-by-bit video datas by chip U2, then through the output pin ROUT0-ROUT9 of chip U2, the signal after conversion is input to main control chip and processes, and carries out distant signal transmission.
The present invention adopts said structure and method, have the following advantages: 1, carry out the conversion of signal by the first modular converter and the second modular converter, overcome the characteristic of traditional camera because of himself, cannot carry out the problem of long-distance transmissions, transmission range of the present invention can reach more than 3 meters; 2, by the improvement of circuit, make to make a video recording and easily install first watch, control also more convenient; 3, cost compare is cheap, and market prospects are comparatively wide.
Brief description of the drawings
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation;
Fig. 1 is logical construction block diagram of the present invention;
Fig. 2 is the circuit structure diagram of the first modular converter in the present invention;
Fig. 3 is the circuit structure diagram of the second modular converter in the present invention;
In Fig. 1,1, image acquisition units; 2, main control chip; 3, display module; 4, the first modular converter; 5, the second modular converter.
Embodiment
An on-vehicle night vision system camera change-over circuit as shown in FIG. 1 to 3, comprises image acquisition units 1, main control chip 2, display module 3;
Described main control chip 2, for the picture signal gathering according to image acquisition units 1, is shown in after deal with data on display module 3; Image acquisition units 1 is connected with described main control chip 2 by the first modular converter 4, the second modular converter 5 successively, and described image acquisition units (1) is CMOS camera or CCD camera.Between the first modular converter 4 and the second modular converter 5, carry out transfer of data by differential lines.
The first modular converter 4, is converted to differential digital video data for the 8 parallel-by-bit video datas that image acquisition units 1 is gathered; Differential digital video data is converted to 8 parallel-by-bit video inputs in main control chip 2 by the second modular converter, and carries out data processing by main control chip 2.The first modular converter 4 adopts chip U3, and its model is DS92LV1021, and described the second modular converter 5 adopts chip U2, and its model is DS92LV1212.
The 27th of chip U3, 28 pins (DVCC pin) access respectively 3.3V power supply, and be connected with two capacitor C 8 and C9 in parallel, the 25th of described chip U3, 26 pins (AVCC pin) access respectively 3.3V power supply, and be connected with two capacitor C 10 and C11 in parallel, the 23rd of chip, 24 pin (DEN, PWDN pin) access 3.3V power supply by resistance R 3 respectively, the 1-12 pin of chip U3 connects image input signal, the 13rd pin of chip U3 is by resistance R 7 ground connection, the 14th pin of chip U3 is connected with the OUT pin of active crystal resonator, on active crystal resonator, be provided with EN pin, VCC pin, OUT pin and GND pin, between the OUT pin of active crystal resonator and VCC pin, be provided with resistance R 6 and access 3.3V power supply, the 22nd of chip U3, 21 pin (DO+, DO-pin) respectively with the 5th of chip U2, 6 pin (RI+, RI-pin) connect.
The 15-19 pin (OUT9-OUT5 pin) of chip U2, 24-28 pin (OUT4-OUT0 pin) is output pin, the 2nd pin (RCLK pin) of chip U2 accesses 3.3V power supply by resistance R 1, the 3rd pin (REFCLK pin) of chip U2 is connected with the OUT pin of crystal oscillating circuit, the 7th pin (PWRDN pin) of chip U2 accesses 3.3V power supply by resistance R 5, the 8th pin (REN pin) of chip U2 accesses 3.3V power supply by resistance R 4 respectively, by capacitor C 2 ground connection, the 9th pin (RCLK pin) of chip U2 is by capacitor C 3 ground connection.
A signal processing method for on-vehicle night vision system camera change-over circuit, method comprises the following steps:
A) quotation marks that change-over circuit gathers CMOS camera by chip U3 (DS92LV1021) input to this chip through input pin 1-12,8 parallel-by-bit video datas are converted to differential digital video data by this chip, RI+ and RI-pin by pin DO+ and DO-and chip U2 transmit the signal after conversion through differential lines, and transmission range can reach more than 3 meters;
B) then by chip U2 (DS92LV1212), differential signal is converted to 8 parallel-by-bit video datas in main control end, through the output pin ROUT0-ROUT9 of chip U2, the signal after conversion being input to main control chip again processes, thereby realize distant signal transmission, transmission range can reach more than 3 meters.
By reference to the accompanying drawings the present invention is exemplarily described above; obviously specific implementation of the present invention is not subject to the restrictions described above; as long as the various improvement that adopted technical scheme of the present invention to carry out, or directly apply to other occasion without improvement, all within protection scope of the present invention.
Claims (8)
1. an on-vehicle night vision system camera change-over circuit, comprises image acquisition units (1), main control chip (2), display module (3);
Described main control chip (2), for the picture signal gathering according to image acquisition units (1), is shown in after deal with data on display module (3);
It is characterized in that: described image acquisition units (1) is connected with described main control chip (2) by the first modular converter (4), the second modular converter (5) successively.
2. a kind of on-vehicle night vision system camera change-over circuit according to claim 1, is characterized in that: described image acquisition units (1) is CMOS camera or CCD camera.
3. a kind of on-vehicle night vision system camera change-over circuit according to claim 1, is characterized in that: between described the first modular converter (4) and the second modular converter (5), carry out transfer of data by differential lines.
4. according to a kind of on-vehicle night vision system camera change-over circuit described in claim 1 or 2 or 3, it is characterized in that: described the first modular converter (4), is converted to differential digital video data for the 8 parallel-by-bit video datas that image acquisition units (1) is gathered;
Described differential digital video data is converted to 8 parallel-by-bit video inputs in main control chip (2) by the second modular converter, and carries out data processing by main control chip (2).
5. according to a kind of on-vehicle night vision system camera change-over circuit described in claim 4 any one, it is characterized in that: described the first modular converter (4) adopts chip U3, its model is DS92LV1021, described the second modular converter (5) adopts chip U2, and its model is DS92LV1212.
6. a kind of on-vehicle night vision system camera change-over circuit according to claim 5, it is characterized in that: the 27th of described chip U3, 28 pins access respectively 3.3V power supply, and be connected with two electric capacity in parallel (C8) and (C9), the 25th of described chip U3, 26 pins access respectively 3.3V power supply, and be connected with two electric capacity in parallel (C10) and (C11), the 23rd of described chip, 24 pins are respectively by resistance (R3) access 3.3V power supply, the 1-12 pin of described chip U3 connects image input signal, the 13rd pin of chip U3 is by resistance (R7) ground connection, the 14th pin of chip U3 is connected with the OUT pin of active crystal resonator, on described active crystal resonator, be provided with EN pin, VCC pin, OUT pin and GND pin, between the OUT pin of described active crystal resonator and VCC pin, be provided with resistance (R6) and access 3.3V power supply, the 22nd of chip U3, 21 pins respectively with the 5th of chip U2, 6 pins connect.
7. a kind of on-vehicle night vision system camera change-over circuit according to claim 5, it is characterized in that: the 15-19 pin of described chip U2, 24-28 pin is output pin, the 2nd pin of chip U2 is by resistance (R1) access 3.3V power supply, the 3rd pin of chip U2 is connected with the OUT pin of crystal oscillating circuit, the 7th pin of chip U2 is by resistance (R5) access 3.3V power supply, the 8th pin of chip U2 is respectively by resistance (R4) access 3.3V power supply, by electric capacity (C2) ground connection, the 9th pin of chip U2 is by electric capacity (C3) ground connection.
8. according to a signal processing method for the on-vehicle night vision system camera change-over circuit described in claim 1-7 any one, it is characterized in that: described method comprises the following steps:
A) quotation marks that change-over circuit gathers CMOS camera by chip U3 input to this chip through input pin 1-12,8 parallel-by-bit video datas are converted to differential digital video data by this chip, the signal after conversion transmitted through differential lines by RI+ and the RI-pin of pin DO+ and DO-and chip U2; B) differential signal is converted to 8 parallel-by-bit video datas by chip U2, then through the output pin ROUT0-ROUT9 of chip U2, the signal after conversion is input to main control chip and processes, and carries out distant signal transmission.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410182203.7A CN103945195A (en) | 2014-04-30 | 2014-04-30 | Camera conversion circuit of vehicle-mounted night vision system and signal processing method of camera conversion circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410182203.7A CN103945195A (en) | 2014-04-30 | 2014-04-30 | Camera conversion circuit of vehicle-mounted night vision system and signal processing method of camera conversion circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107071227A (en) * | 2017-03-27 | 2017-08-18 | 苏州工业园区职业技术学院 | A kind of camera video split circuit of intelligent vehicle |
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| US20110122262A1 (en) * | 2009-11-20 | 2011-05-26 | Hiroshi Shinozaki | Method and apparatus for information reproduction |
| CN202713506U (en) * | 2012-03-22 | 2013-01-30 | 奇瑞汽车股份有限公司 | Anti-dazzling vehicle-mounted night vision system |
| CN203522938U (en) * | 2013-10-28 | 2014-04-02 | 航天信息股份有限公司 | Image long-distance transmission system |
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2014
- 2014-04-30 CN CN201410182203.7A patent/CN103945195A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110122262A1 (en) * | 2009-11-20 | 2011-05-26 | Hiroshi Shinozaki | Method and apparatus for information reproduction |
| CN202713506U (en) * | 2012-03-22 | 2013-01-30 | 奇瑞汽车股份有限公司 | Anti-dazzling vehicle-mounted night vision system |
| CN203522938U (en) * | 2013-10-28 | 2014-04-02 | 航天信息股份有限公司 | Image long-distance transmission system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107071227A (en) * | 2017-03-27 | 2017-08-18 | 苏州工业园区职业技术学院 | A kind of camera video split circuit of intelligent vehicle |
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