CN104994270A - Vehicle-mounted camera image processing system in low light environment - Google Patents
Vehicle-mounted camera image processing system in low light environment Download PDFInfo
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- CN104994270A CN104994270A CN201510476680.9A CN201510476680A CN104994270A CN 104994270 A CN104994270 A CN 104994270A CN 201510476680 A CN201510476680 A CN 201510476680A CN 104994270 A CN104994270 A CN 104994270A
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Abstract
The invention relates to a vehicle-mounted camera image processing system in a low light environment. In the system, an input/output (I/O) interface (1) is connected with a power management unit (2); the power management unit (2) is connected with a low light image sensor (3), a digital-analog (D/A) converter (5) and an external storer (6); the low light image sensor (3) is connected with the external storer (6); an infrared optical lens (4) is connected with the low light image sensor (3); the low light image sensor (3) is connected with the D/A converter (5); the D/A converter (5) is connected with an image driving unit (7); the image driving unit (7) is connected with a filter circuit (8); and the output end of the filter circuit (8) is connected with the I/O interface (1). In a dark or low light environment, the low light vehicle-mounted camera can assist a driver in safe traveling without the help of image identification and detection by an external infrared compensation light source.
Description
[technical field]
The present invention relates to vehicle-mounted camera technical field, specifically vehicle-mounted camera image treatment system under a kind of low-light (level) environment.
[background technology]
Vehicle-mounted camera is just being widely used on various vehicle as an electronic assistant of running safety, in the raising driver and crew visual field, reduces to play active and effective effect in blind area, reduction road accident rate.Increase along with to vehicle-mounted camera demand, its applied environment also presents diversified trend, not only be used on various car, engineering truck, motor bus, school bus, and by day, in night or dim light situation to video image and performance requirement also more and more higher, particularly under night or rather dark environment, to identify the image even demand of high-definition color video and grow with each passing day.
For the application of vehicle-mounted camera under dark or the faint environment of light, vehicle-mounted camera night vision poor effect common in the market, at all cannot recognisable image, cannot satisfy the demands.And present stage more general scheme be (closely) infrared compensatory light vehicle-mounted camera, namely send infrared light supply light filling by the infrared lamp matrix be integrated on camera, irradiate shooting area to obtain scenery black and white image.Though this infrared vehicle-mounted camera can identify nighttime image by means of infrared light filling, be limited to its detection range of infrared lamp power comparatively near, general 2 ~ 3m, and remotely scenery None-identified.In addition, the use of infrared matrix lamp compensatory light, power supply power consumption must be caused on the one hand to increase (the general 0.2 ~ 0.3A of electric current), and caloric value is high, accelerating circuit component aging, reduces life of product; Affect Design of Mechanical Structure, quality weight on the other hand, overall dimension is large, is not easy to vehicle and installs and vehicle lightness.
[summary of the invention]
Object of the present invention is exactly will solve above-mentioned deficiency and vehicle-mounted camera image treatment system under providing a kind of low-light (level) environment, achieve application low light and shine vehicle-mounted camera under dark or dim environment, do not carry out image recognition detecting by the infrared compensatory light in the external world, driver and crew's traffic safety can be assisted.
Vehicle-mounted camera image treatment system under designing a kind of low-light (level) environment for achieving the above object, comprise I/O input/output interface 1, Power Management Unit 2, low-light (level) imageing sensor 3, infrared optical lens 4, D/A converter 5, external memory storage 6, image-driven unit 7 and filter circuit 8, the output of described I/O input/output interface 1 connects the input of Power Management Unit 2, the output of described Power Management Unit 2 connects low-light (level) imageing sensor 3 respectively, D/A converter 5, external memory storage 6, described low-light (level) imageing sensor 3 is connected with the output of external memory storage 6, the output of described infrared optical lens 4 connects low-light (level) imageing sensor 3, the output of described low-light (level) imageing sensor 3 connects D/A converter 5, the output connection layout of described D/A converter 5 is as the input of driver element 7, the output of described image-driven unit 7 connects the input of filter circuit 8, the output of described filter circuit 8 is connected with I/O input/output interface 1.
Described low-light (level) imageing sensor 3 adopts the CMOS of 1/3 inch.
Described infrared optical lens 4 is built-in with at least two multilayer filter, and described filter is provided with antireflection anti-reflection film.
Compared with the existing technology, tool has the following advantages in the present invention:
(1) low-light level imaging quality is high: under dark surrounds or low-light, and low noise point is dynamically wide, can catch high-definition image;
(2) stability is high: electric current is little, and heating is few, anti-aging, durable length, low-power consumption, is convenient to safeguard;
(3) feasibility is high: succinctly, compensate without infrared light supply, overall dimension is little for circuit and mechanism design;
(4) application prospect is extensive: analyze and future development from overall market, automotive field relates to car, engineering vehicle, motor bus, school bus etc., and its application is boundless.
To sum up: present invention achieves application low light and shine vehicle-mounted camera under dark or dim environment, do not carry out image recognition detecting by the infrared compensatory light in the external world, driver and crew's traffic safety can be assisted, be worthy of popularization.
[accompanying drawing explanation]
Fig. 1 is theory diagram of the present invention;
Fig. 2 is traditional infrared compensatory light vehicle-mounted camera built-in system logic diagram;
In figure: 1, I/O input/output interface 2, Power Management Unit 3, low-light (level) imageing sensor 4, infrared optical lens 5, D/A converter 6, external memory storage 7, image-driven unit 8, filter circuit 9, common image sensor 10, LED drive circuit 11, infrared LED matrix 12, ordinary optical camera lens 13, image enlarging unit.
[embodiment]
Below in conjunction with accompanying drawing, following further illustrating is done to the present invention:
As shown in Figure 1, the present invention includes: I/O input/output interface 1, Power Management Unit 2, low-light (level) imageing sensor 3, infrared optical lens 4, D/A converter 5, external memory storage 6, image-driven unit 7 and filter circuit 8, the output of I/O input/output interface 1 connects the input of Power Management Unit 2, the output of Power Management Unit 2 connects low-light (level) imageing sensor 3 respectively, D/A converter 5, external memory storage 6, low-light (level) imageing sensor 3 is connected with the output of external memory storage 6, the output of infrared optical lens 4 connects low-light (level) imageing sensor 3, the output of low-light (level) imageing sensor 3 connects D/A converter 5, the output connection layout of D/A converter 5 is as the input of driver element 7, the output of image-driven unit 7 connects the input of filter circuit 8, the output of filter circuit 8 is connected with I/O input/output interface 1, wherein, low-light (level) imageing sensor 3 adopts the CMOS of 1/3 inch, and infrared optical lens 4 is built-in with at least two multilayer filter, and filter is provided with antireflection anti-reflection film.
Operation principle of the present invention is: this low-light (level) vehicle-mounted camera power range supports DC9 ~ 16V, external power source is input to internal system Power Management Unit 2 through I/O input/output interface 1, distributes to each electricity consumption modules such as low-light (level) imageing sensor 3, external memory storage 6 and D/A converter 5 after its step-down process respectively; Call the parameter stored in external memory storage 6 after low-light (level) imageing sensor 3 powers on and carry out initial configuration, extraneous light enters into low-light (level) imageing sensor 3 induction image forming through infrared optical lens 4, the digital signal generated after imaging is converted to image analoging signal through D/A converter 5, and successively after image-driven unit 7, filter circuit 8 process, again by I/O input/output interface 1, vision signal being supplied to car-mounted display unit, finally completing image from being generated to this process of process.
The present invention mainly applies low light and under dark or dim environment, does not carry out image recognition detecting according to vehicle-mounted camera by the infrared compensatory light in the external world, auxiliary driver and crew's traffic safety.This system comparatively traditional camera imaging clearly under dark or faint starlight, comparatively (closely) infrared light filling camera can catch high clear colorful image without the need to compensatory light; This system does not adopt DSP image processing techniques, is different from current vehicle-mounted high-end video image procossing product, and its design is succinct, and comparatively DSP scheme is low for cost, and power consumption is little; And not adopting built-in infrared LED compensatory light to design, product (tens milliamperes) low in energy consumption caloric value is little, and system is more stable, and utilizes product structure miniaturization to be convenient to install.
In the present invention, adopt 1/3 " ISO CMOS; high-resolution colour picture can be caught in 0.005lux low-light conditions and there is wide dynamic range (WDR) feature; simultaneously by AEC-Q100 reliability testing for vehicle-mounted image sensor, but price is very nearly the same with common image sensor; And adopt the built-in multilayer of special infrared optical lens to filter and AR-coating (antireflection anti-reflection film), make cmos sensor obtain the most appropriate imaging light, effectively improve image quality.
The present invention, by the restriction of above-mentioned execution mode, change, the modification done, substitutes, combines, simplifies under other any does not deviate from Spirit Essence of the present invention and principle, all should be equivalent substitute mode, is included within protection scope of the present invention.
Claims (3)
1. vehicle-mounted camera image treatment system under a low-light (level) environment, it is characterized in that: comprise I/O input/output interface (1), Power Management Unit (2), low-light (level) imageing sensor (3), infrared optical lens (4), D/A converter (5), external memory storage (6), image-driven unit (7) and filter circuit (8), the output of described I/O input/output interface (1) connects the input of Power Management Unit (2), the output of described Power Management Unit (2) connects low-light (level) imageing sensor (3) respectively, D/A converter (5), external memory storage (6), described low-light (level) imageing sensor (3) is connected with the output of external memory storage (6), the output of described infrared optical lens (4) connects low-light (level) imageing sensor (3), the output of described low-light (level) imageing sensor (3) connects D/A converter (5), the output connection layout of described D/A converter (5) is as the input of driver element (7), the output of described image-driven unit (7) connects the input of filter circuit (8), the output of described filter circuit (8) is connected with I/O input/output interface (1).
2. vehicle-mounted camera image treatment system under low-light (level) environment as claimed in claim 1, is characterized in that: described low-light (level) imageing sensor (3) adopts the CMOS of 1/3 inch.
3. vehicle-mounted camera image treatment system under low-light (level) environment as claimed in claim 2, is characterized in that: described infrared optical lens (4) is built-in with at least two multilayer filter, and described filter is provided with antireflection anti-reflection film.
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Application publication date: 20151021 |
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