CN1555993A - Automobile infrared night vision system - Google Patents
Automobile infrared night vision system Download PDFInfo
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- CN1555993A CN1555993A CNA2003101176741A CN200310117674A CN1555993A CN 1555993 A CN1555993 A CN 1555993A CN A2003101176741 A CNA2003101176741 A CN A2003101176741A CN 200310117674 A CN200310117674 A CN 200310117674A CN 1555993 A CN1555993 A CN 1555993A
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Abstract
An infrared night-viewing system for car is composed of an infrared projecting lamp consisting of infrared LED and parabolic reflector, a CCD camera for receiving the reflected infrared signals and converting them to video signals, a video processing circuit for receiving and processing said video signals, and a car-carried display for displaying the processed video signals.
Description
Technical field
The present invention relates to signal processing technology, relate in particular to a kind of automobile infrared night vision system.
Background technology
Along with the fast development of automotive market and the reinforcement day by day of security protection consciousness, people are more and more higher to the requirement of automotive safety safeguards technique, and existing automobile lighting system descends in low situations of visbilitys such as rainy night, snow day or dense fogs that sighting distance is not far, the disadvantage of poor effect becomes one of potential safety hazard of running car, and can develop a kind of infrared night vision system that can effectively improve chaufeur sighting distance and visual effect under above-mentioned environment becomes domestic and international auto trade major issue suddenly to be solved.
Regrettably, though development of new automobile infrared night vision system has become people in the industry's common recognition, but the well-known automobile manufacturing enterprise of external minority is only arranged at present at its high-grade car of producing even only be that infrared night vision system is housed on the concept car, as the up-to-date benz high-grade car of producing of Germany, the up-to-date Toyota's concept car produced of Japan and the up-to-date Cadillac high-grade car of producing of the U.S. etc.The infrared night vision system complex structure that these cars are equipped, cost an arm and a leg, non-general automobile consumption family can make inquiries.Therefore, exploitation has China's independent intellectual property right, simple in structure, stable performance, cost performance height, good reliability, automobile infrared night vision system that applicability is strong, has important academic research meaning and wide market application prospect to improve the technical merit of China in this field.
Summary of the invention
At the shortcoming of prior art, the purpose of this invention is to provide a kind of simple in structure, stable performance, good reliability, new automobile infrared night vision system that applicability is strong.
Automobile infrared night vision system of the present invention comprises:
Red infrared illumination light comprises infrarede emitting diode and parabolic reflector, is used to send the infrared light of specific wavelength;
Ccd video camera is used to receive the infrared signal of object reflection and be converted into vision signal;
Video processing circuits is used for receiving and the described vision signal of multiframe accumulation process;
Vehicular display device is used to receive and show the vision signal of handling through described video processing circuits.
In above-mentioned automobile infrared night vision system:
The driving circuit of described infrarede emitting diode is the non-coding type circuit of single channel that 555 time base circuits are formed, and the non-coding type circuit of this single channel can reduce the dutycycle of circuit output pulse, improves the peak current of infrarede emitting diode.
In described parabolic reflector, place lens, the light source of described infrared discharge lamps is positioned on the focus of described lens.
Described video processing circuits comprises that A/D conversion chip, CPLD logic control chip, frame deposit body and ARM embedded microprocessor; The A/D conversion chip is used to receive the analog video signal of described ccd video camera input and carries out video decode and deposits frame in after the digital image and deposit body to be converted to, the ARM embedded microprocessor is used for reading frame to be deposited the data of body and exports described Vehicular display device to, and CPLD logic control chip is used for control frame and deposits depositing in and reading of body data.
Described ccd video camera is the black-white CCD pick up camera.
Before described ccd video camera, install near infrared filter or near infrared coated lens additional.
The pixel of the specific centre portion of the CCD device of described ccd video camera is a valid pixel, and part is the shockproof cushioning district around all the other.
In described ccd video camera, install the suspension camera lens additional.
Automobile infrared night vision system of the present invention comes vision signal is carried out the multiframe accumulation process by video processing circuits, has improved the visibility of image greatly; Adopt the non-coding type circuit of single channel to reduce the dutycycle of circuit output pulse, and in described parabolic reflector, place lens, so, need not to use high-performance infrarede emitting diode, ranging coverage is greatly increased.
Description of drawings
Fig. 1 is an automobile infrared night vision system composition frame chart of the present invention;
Fig. 2 is the non-coding type schematic block circuit diagram of single channel of the present invention;
Fig. 3 is an infrared light supply luminous energy distribution schematic diagram;
Fig. 4 is the guide lamp fundamental diagram;
Fig. 5 is a video processing circuits block diagram of the present invention.
The specific embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
Referring to Fig. 1, the automobile infrared night vision system of present embodiment mainly is made up of red infrared illumination light, black-white CCD pick up camera, video processing circuits and Vehicular display device, is described below respectively:
Red infrared illumination light includes infrarede emitting diode and parabolic mirror, and wherein, infrarede emitting diode sends ultrared irradiation distance (ranging coverage) and is directly proportional with its emissive power.In order to increase ranging coverage, infrarede emitting diode should work in pulse condition, because undulating light is a kind of light modulated, its effective transmission distance is directly proportional with the peak current Ip of pulse, thereby, just can increase the ranging coverage of infrarede emitting diode as long as improve peak current Ip.Improve the method for Ip, can adopt the approach that reduces pulse duty factor to realize, i.e. the width T of compression pulse.Usually, reducing pulse duty factor can make the ranging coverage of miniwatt infrarede emitting diode increase greatly.Circuit shown in Figure 2 is the driving circuit of the infrarede emitting diode of present embodiment, be actually a non-coding type circuit of single channel that utilizes 555 time base circuits to form, wherein 555 chips are formed multi-vibrator, other has isolation diode D1 and D2 to make charging and discharging circuit independently to adjust, thereby make the dutycycle of circuit output pulse reach 1: 10, the peak current that this helps to improve infrarede emitting diode increases its ranging coverage.555 3. pin output pulse signal is through R
3Be added to the base stage of aerotron VT, drive infrarede emitting diode D3 work by VT.Its working process is: behind the energized VCC, it charges to capacitor C 1 through R1 and R2, when the electric capacity both end voltage rises a little more than 2/3VCC, 3. being output as of IC555 " 0 ", the discharge bulb conducting in 555 simultaneously, electric capacity passes through RP1, D1,7. pin, 555 discharge bulb T, 1. pin discharge, when its both end voltage drops to a little less than 1/3VCC, 3. pin output " 1 ", this moment, discharge bulb T ended, and VCC is again to capacitor C 1 charging.So repeatedly, the 3. then exportable continuous square wave of pin.And, can change the time that discharges and recharges by regulating the resistance value of RP1, also can change the dutycycle of output square wave.By practice, prove that this circuit can improve the ranging coverage of infrarede emitting diode greatly.Usually, the light intensity of infrared light supply as shown in Figure 3, by this figure as can be seen, the luminous energy in infrared light supply directive the place ahead is bigger.Therefore present embodiment is also used for reference the guide lamp principle, as shown in Figure 4, place lens (group) at dotted line position, and light source is dropped on its focus, point source of light both had been on the focus of parabolic reflector like this, also be on the focus of lens (group), thereby the light of injecting lens (group) will be focused into the collimated light ejaculation by lens (group), light beyond 2 ω then forms collimated light by parabolic mirror and penetrates, originally most of luminous energy that divergence loss is fallen collects, impaired only is the light that incides in the Δ ω cone angle, so just can improve the degree of utilization of luminous energy greatly.Owing to technical reason (can not be point source of light as actual light source), focusing is difficulty relatively, thereby light deflector emission light has certain angle of scattering (as 2 α=5 °) usually, again because of sighting distance l with
Be inversely proportional to, when angle of scattering hour, have
So sighting distance and angle of scattering are inversely proportional to as can be known.Dwindle half as angle of scattering, then sighting distance can double.
Present embodiment adopts general black-white CCD pick up camera, do not adopt such as special-purpose infrared photography devices such as infrared image converter tube, Pyroelectric Infrared Tube, infrared ccd imagers, its major cause is based on the economy of cost and considers, above-mentioned dedicated devices price is all very expensive, if it is used for the on-vehicle night vision system, be difficult to open up application market widely.In addition, the imageing sensor of common black-white CCD pick up camera has very wide sensitization spectral region, and its sensitization spectrum can extend to region of ultra-red usually.In addition, use ccd video camera to have two problems: (1) high light interference problem.The ccd video camera that is operated under the infrared night vision condition is very responsive to the interference effect of visible light, and this is in the spectral responsivity high a lot of cause of visible light wave range than near infrared band because of ccd video camera.When high light disturbs, only show the white light that a slice is dazzling in the Liquid Crystal Display (LCD), had a strong impact on display effect.To this, the present embodiment solution is to install a near infrared filter or near infrared coated lens before pick up camera additional.So-called infrared fileter (or claiming infrared band pass filter) be a kind of allow wavelength in 0.76～1.2um scope, the sightless near infrared light of human eye passes through the optical mirror slip that the mirror that the light wave of other wavelength will be refused is outer.Run-of-the-mill infrared fileter preferably can be up to more than 99% to ultrared penetrating rate, so used a slice infrared fileter just can solve well head-on to send a car the high light interference problem brought.(2) vibration influence problem.Because even pick up camera CCD camera lens is subjected to very small vibrations, the capital is frequently shaken the image in the Vehicular display device, thereby can't see image clearly, thereby the vibration influence problem that vehicle ' is brought is very serious, must be properly settled, just can be given automobile infrared night vision system practical value.Present embodiment has adopted the electronic shock technology to solve this problem, and its cardinal principle is to rely on signal processing mode to solve problem.Suppose that the CCD device has 680,000 pixels, pick up camera is only got its 340,000 middle pixel as valid pixel, and pixel is as the shockproof cushioning district, in order to calculate sharp image around all the other.If but the vibrations scope is greater than buffer zone, then its effect is just not good, adds the raw video data through calculating how much have distortion picture now, is embodied in image and can stays ghost.Because image is exaggerated, thus the image quality variation, but shockproof effect is better usually.In addition, also can adopt the optics shake-proof technology, its cardinal principle is to utilize eyeglass inertia buffer gear, allows the CCD device keep inertia balance and reaches shockproof purpose.Can buy a kind of inexpensive suspension camera lens in the optical lens market at present, directly be installed at and then can solve the vibration influence problem that vehicle ' is brought on the CCD camera.
The video processing circuits of present embodiment adopts the core of 32 embedded systems as video processing, utilizes that its speed is fast, picture quality is high, and the low and good advantage of commonality of cost is carried out the multiframe accumulation process to vision signal, effectively solves image quality issues.Referring to Fig. 5, the composition of video processing circuits mainly contains: the A/D conversion chip, frames in high speed is deposited, CPLD logic control chip and 32 ARM embedded microprocessors.Pick up camera sends to the A/D conversion chip with the simulate data that collects and carries out video decode, be converted to 8 bit digital images, and be that unit deposits frame in and deposits in the body with the pixel every two field picture, its video timing sequence generating circuit be used for producing row synchronously, multiple internal clock signals such as multiple synchronizing signal such as field synchronization and pixel clock.CPLD logic control chip need be finished the decoding of interrupt request and the decoding of chip selection signal, and provide clock signal of frequency reducing etc., it deposits body storage data by judging that field sync signal and line synchronising signal decide to frames in high speed, when frame deposit body full after, CPLD produces a break request signal, and notice CPU can read away data.If obtain the interrupt response that CPU sends, then the interrupt response signal effectively (hangs down effectively).CPLD makes memory device chip selection signal and memory write signals be low level simultaneously after receiving the interrupt response signal, and CPU reads data.When starting of embedded operation system, at first subsystem is powered, drive program loading equipment manager (Device Manager) with video acquisition system, finish following work by the initialization function of application call MDD layer then, CPLD logic control chip is carried out initialization, the A/D conversion chip is carried out initialization, and various mode of operations, mode of operation, data output format that can be by I2C bus control chip and read internal state information etc.To the reading all to respond by interrupt request and finish of image, because the processing speed of ARM microprocessor is deposited the speed height of body and A/D conversion chip far away than frame, therefore interrupt request and sound in succession would not bring very big load to system.The advantage of this circuit is: picture quality is harmless, real-time, interface circuit is simple, extensibility is strong.Entire circuit is a modular construction, and volume is little, is easy to mounting, commissioning and maintenance.This circuit also can pass through its interface outside being used as image processing in addition, switches with vehicle mounted multimedia, and applicability is stronger.The video processing circuits of present embodiment can be improved quality of TV image in real time, increases the ability of system identification and object observing, increases ranging coverage.
During the work of this automobile infrared night vision system, red infrared illumination light sends the infrared ray of specific wavelength, and shine 0～150 meter of vehicle front, at this moment, object in the infrared radiation scope will reflect infrared ray, these will be received by B by the infrared ray that object reflects, and become the information source of object image-forming.Because the black-white CCD pick up camera can change into electric signal with infrared signal, and electric image signal is through after the processing of video processing circuits, the driver can be directly inputted on the Vehicular display device, so just can come direct viewing the place ahead ground-surface image situation by read-out.
Though the present invention discloses as above with a preferred embodiment, is not in order to limit scope of the invention process.Any those of ordinary skill in the art, promptly every when doing a little improvement in not breaking away from invention scope of the present invention according to the equal improvement that the present invention did, should be invention scope of the present invention and contain.
Claims (10)
1, a kind of automobile infrared night vision system is characterized in that, comprising:
Red infrared illumination light, this red infrared illumination light comprises infrarede emitting diode and parabolic reflector, is used to send the infrared light of specific wavelength;
Ccd video camera is used to receive the infrared signal of object reflection and be converted into vision signal;
Video processing circuits is used for receiving and the described vision signal of multiframe accumulation process;
Vehicular display device is used to receive and show the vision signal of handling through described video processing circuits.
2, automobile infrared night vision system as claimed in claim 1, it is characterized in that, the driving circuit of described infrarede emitting diode is the non-coding type circuit of single channel that 555 time base circuits are formed, the non-coding type circuit of this single channel can reduce the dutycycle of circuit output pulse, improves the peak current of infrarede emitting diode.
3, automobile infrared night vision system as claimed in claim 1 is characterized in that, places lens in described parabolic reflector, and the light source of described infrared discharge lamps is positioned on the focus of described lens.
4, automobile infrared night vision system as claimed in claim 1 is characterized in that, described video processing circuits comprises that A/D conversion chip, CPLD logic control chip, frame deposit body and ARM embedded microprocessor; The A/D conversion chip is used to receive the analog video signal of described ccd video camera input and carries out video decode and deposits frame in after the digital image and deposit body to be converted to, the ARM embedded microprocessor is used for reading frame to be deposited the data of body and exports described Vehicular display device to, and CPLD logic control chip is used for control frame and deposits depositing in and reading of body data.
5, automobile infrared night vision system as claimed in claim 1 is characterized in that, described ccd video camera is the black-white CCD pick up camera.
6, automobile infrared night vision system as claimed in claim 1 is characterized in that, installs near infrared filter or near infrared coated lens before described ccd video camera additional.
7, automobile infrared night vision system as claimed in claim 1 is characterized in that, the pixel of the specific centre portion of the CCD device of described ccd video camera is a valid pixel, and part is the shockproof cushioning district around all the other.
8, automobile infrared night vision system as claimed in claim 1 is characterized in that, installs the suspension camera lens in described ccd video camera additional.
9, a kind of red infrared illumination light, comprise infrarede emitting diode and parabolic reflector, it is characterized in that, the driving circuit of described infrarede emitting diode is the non-coding type circuit of single channel that 555 time base circuits are formed, the non-coding type circuit of this single channel can reduce the dutycycle of circuit output pulse, improves the peak current of infrarede emitting diode; Or/and in described parabolic reflector, place lens, the light source of described infrared discharge lamps is positioned on the focus of described lens.
10, a kind of video processing circuits is characterized in that, comprises that A/D conversion chip, CPLD logic control chip, frame deposit body and ARM embedded microprocessor; The A/D conversion chip is used to receive the analog video signal of input and carries out video decode and deposits frame in after the digital image and deposit body to be converted to, the ARM embedded microprocessor is used for reading data and the output that frame is deposited body, and CPLD logic control chip is used for control frame and deposits depositing in and reading of body data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101176741A CN1312001C (en) | 2003-12-31 | 2003-12-31 | Automobile infrared night vision system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101176741A CN1312001C (en) | 2003-12-31 | 2003-12-31 | Automobile infrared night vision system |
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| CN1555993A true CN1555993A (en) | 2004-12-22 |
| CN1312001C CN1312001C (en) | 2007-04-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2003101176741A Expired - Fee Related CN1312001C (en) | 2003-12-31 | 2003-12-31 | Automobile infrared night vision system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101470328B (en) * | 2007-12-26 | 2011-07-27 | 中国科学院半导体研究所 | Vehicle auxiliary night viewing system employing infrared semiconductor laser light source |
| CN103863191A (en) * | 2014-03-27 | 2014-06-18 | 天津云视科技发展有限公司 | Automobile infrared night vision device |
| CN106303423A (en) * | 2016-08-12 | 2017-01-04 | 深圳市互联互通汽电科技有限公司 | IR night vision apparatus |
| CN107776494A (en) * | 2017-09-29 | 2018-03-09 | 袁春续 | A kind of automobile at night security monitor |
| CN108340837A (en) * | 2018-04-25 | 2018-07-31 | 深圳新亮智能技术有限公司 | Vehicle night vision DAS (Driver Assistant System) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102745135A (en) * | 2012-07-24 | 2012-10-24 | 苏州工业园区七星电子有限公司 | Active vehicle infrared night vision system |
| CN102745139A (en) * | 2012-07-24 | 2012-10-24 | 苏州工业园区七星电子有限公司 | Vehicle night driving assistance system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1126969C (en) * | 1999-03-08 | 2003-11-05 | 戴巍 | Night viewer for motor vehicle |
| CN1458014A (en) * | 2003-05-30 | 2003-11-26 | 陈湘云 | Vehicle carried night vision auxiliary device |
-
2003
- 2003-12-31 CN CNB2003101176741A patent/CN1312001C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101470328B (en) * | 2007-12-26 | 2011-07-27 | 中国科学院半导体研究所 | Vehicle auxiliary night viewing system employing infrared semiconductor laser light source |
| CN103863191A (en) * | 2014-03-27 | 2014-06-18 | 天津云视科技发展有限公司 | Automobile infrared night vision device |
| CN106303423A (en) * | 2016-08-12 | 2017-01-04 | 深圳市互联互通汽电科技有限公司 | IR night vision apparatus |
| CN106303423B (en) * | 2016-08-12 | 2019-04-19 | 深圳市互联互通汽电科技有限公司 | IR night vision apparatus |
| CN107776494A (en) * | 2017-09-29 | 2018-03-09 | 袁春续 | A kind of automobile at night security monitor |
| CN108340837A (en) * | 2018-04-25 | 2018-07-31 | 深圳新亮智能技术有限公司 | Vehicle night vision DAS (Driver Assistant System) |
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| Publication number | Publication date |
|---|---|
| CN1312001C (en) | 2007-04-25 |
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Granted publication date: 20070425 Termination date: 20101231 |