CN113014748A - Camera infrared lamp dynamic light supplementing system and method - Google Patents
Camera infrared lamp dynamic light supplementing system and method Download PDFInfo
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- CN113014748A CN113014748A CN201911314367.XA CN201911314367A CN113014748A CN 113014748 A CN113014748 A CN 113014748A CN 201911314367 A CN201911314367 A CN 201911314367A CN 113014748 A CN113014748 A CN 113014748A
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- photosensitive chip
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/56—Cameras or camera modules comprising electronic image sensors; Control thereof provided with illuminating means
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/74—Circuitry for compensating brightness variation in the scene by influencing the scene brightness using illuminating means
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Abstract
The invention discloses a dynamic light supplementing system and method for an infrared lamp of a camera. The photosensitive chip is used for detecting the image information of the shot picture and judging the brightness degree of the picture; the ISP image processing module is used for receiving the signal fed back by the photosensitive chip, processing image information and outputting a light supplement control signal; the PWM control module is used for receiving the control signal output by the ISP image module and outputting a light supplement driving signal with different duty ratios; and the infrared light supplement lamp device is used for receiving light supplement driving signals with different duty ratios and emitting light supplement with different brightness. The invention obtains normal picture information in a complex light environment and provides the normal picture information for an upper computer to use; the consumption of whole camera module is reduced, the problem that infrared light filling lamp device is overheated to lead to excessively is improved, and infrared light filling lamp device is effectively used to furthest, adjusts infrared lamp and automatic exposure adjustment and combines to obtain stable luminance picture.
Description
Technical Field
The invention relates to the technical field of camera light supplement, in particular to a system and a method for camera infrared lamp dynamic light supplement.
Background
At present, a face detection camera module used on a vehicle mainly comprises a cmos camera and an infrared light supplement lamp, a 940nm or 850nm optical filter is adopted for a lens, interference of visible light in the environment on a shooting scene is filtered, and only infrared light of a 940nm or 850nm waveband is received. Under the scene without infrared light, an infrared light supplement lamp is adopted for supplementing light, so that the shooting scene is bright, and a bright picture is obtained.
However, because the environment is filled with infrared light with different intensities, and general infrared light filling lamp devices can be maintained under a constant light filling power state, the environment with strong infrared light is provided, scene overexposure occurs, meanwhile, devices such as infrared light filling and the like are maintained to work under constant power no matter what the infrared light scene is strong or weak, a large amount of heat is generated, the temperature of module equipment is too high, the shell melts the equipment damage and the like, even under the long-time irradiation of a strong infrared light filling lamp, certain influence is generated on a human body.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a dynamic light supplementing system and method for an infrared lamp of a camera.
In order to achieve the purpose, the invention adopts the following technical scheme:
a system and a method for dynamically supplementing light for an infrared lamp of a camera comprise the following hardware:
the photosensitive chip is used for detecting the image information of the shot picture and judging the brightness degree of the picture;
the ISP image processing module is used for receiving the signal fed back by the photosensitive chip, processing image information and outputting a light supplement control signal;
the PWM control module is used for receiving the control signal output by the ISP image module and outputting a light supplement driving signal with different duty ratios;
the infrared light supplement lamp device is used for receiving light supplement driving signals with different duty ratios and emitting light supplement with different brightness;
the method comprises the following steps:
s1, enabling ambient light to enter the photosensitive chip through the lens, and exposing the photosensitive chip;
s2, when the ambient light is bright, the photosensitive chip obtains the target brightness image output by adjusting the line exposure; when the ambient light brightness is dark, the line exposure time of the photosensitive chip is adjusted to be maximum, and the target brightness cannot be obtained, light is supplemented;
s3, controlling and outputting different duty ratios through the PWM control module to achieve the purpose of adjusting the intensity of the infrared light supplement lamp device, supplementing ambient light and enabling the photosensitive chip to obtain an image output of target brightness;
and S4, performing gain adjustment on the photosensitive chip, wherein when the infrared light supplement lamp device supplements light to the utmost, the photosensitive chip performs gain adjustment, and the higher the gain of the photosensitive chip is, the higher the picture brightness is.
Preferably, in step S3, the method further includes synchronizing with the Vsync signal of the light sensing chip, performing light supplement in a time region where the light sensing chip performs exposure, and turning off the infrared light supplement lamp device in a non-exposure time region.
Preferably, in the step S3, the relation between the image brightness and the PWM duty ratio is y = -1.1048x + 70.031x-90.155, y = the image brightness, and x = the PWM duty ratio.
Due to the adoption of the scheme, the invention obtains normal picture information in a complex light environment and provides the normal picture information for an upper computer to use; the consumption of whole camera module is reduced, the problem that infrared light filling lamp device is overheated to lead to excessively is improved, and infrared light filling lamp device is effectively used to furthest, adjusts infrared lamp and automatic exposure adjustment and combines to obtain stable luminance picture.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a schematic circuit diagram of a PWM control module according to an embodiment of the present invention.
Fig. 3 is a timing diagram of the operation of synchronizing the exposure time of the photosensitive chip of the infrared fill-in light device according to the embodiment of the invention.
FIG. 4 is a timing diagram of exposure adjustment according to an embodiment of the present invention.
Fig. 5 is a graph of the image brightness of the photosensitive chip and the PWM output duty ratio of the infrared fill-in light device according to the embodiment of the present invention.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.
As shown in fig. 1 to 5, in the system and method for dynamically supplementing light to an infrared lamp of a camera according to the present embodiment, a light sensing chip is used for detecting image information of a captured image and determining a brightness level of the image;
the ISP image processing module is used for receiving the signal fed back by the photosensitive chip, processing image information and outputting a light supplement control signal;
the PWM control module is used for receiving the control signal output by the ISP image module and outputting a light supplement driving signal with different duty ratios;
the infrared light supplement lamp device is used for receiving light supplement driving signals with different duty ratios and emitting light supplement with different brightness;
the method comprises the following steps:
s1, enabling ambient light to enter the photosensitive chip through the lens, and exposing the photosensitive chip;
s2, when the ambient light is bright, the photosensitive chip obtains the target brightness image output by adjusting the line exposure; when the ambient light brightness is dark, the line exposure time of the photosensitive chip is adjusted to be maximum, and the target brightness cannot be obtained, light is supplemented;
s3, controlling and outputting different duty ratios through the PWM control module to achieve the purpose of adjusting the intensity of the infrared light supplement lamp device, supplementing ambient light and enabling the photosensitive chip to obtain an image output of target brightness;
and S4, performing gain adjustment on the photosensitive chip, wherein when the infrared light supplement lamp device supplements light to the utmost, the photosensitive chip performs gain adjustment, and the higher the gain of the photosensitive chip is, the higher the picture brightness is.
During specific implementation, the ISP image processing module controls the infrared light supplementing lamp device through the PWM control module, and the light and shade of the infrared light supplementing lamp device are adjusted by using different duty ratios, so that the effect of dynamic light supplementing is achieved. The intensity of the supplementary lighting is calculated according to the source and the ISP image processing module or is obtained by calculating the brightness of the whole photosensitive chip or receiving the brightness information transmitted from the upper computer serial port.
In step S3, the method further includes synchronizing with the Vsync signal of the light sensing chip, performing light supplement in the time region of the light sensing chip during exposure, and turning off the infrared light supplement lamp in the non-exposure time region, so as to save energy consumption and reduce extra heat while ensuring normal exposure brightness of the light sensing chip.
For further explanation, FIGS. 2-5 are provided,
fig. 2 is a specific circuit diagram of the PWM control module, in the circuit diagram, a driving chip is MP2340GJ or TSOT23-6, and the specific operating principle of the circuit is that a control signal is input through an ISP image processing module, and duty ratio output is dynamically controlled in real time, so that the IO controls the square wave switch of the PWM to achieve the control of the switching PWM.
Fig. 3 is a timing diagram of the synchronous exposure time of the photosensitive chip of the infrared fill-in light device. In the figure, Vsync is a field sync signal, T is a period of one Vsync, T1 is a non-exposure time region, and a shadow portion of T2 is an effective exposure time region of the photo chip. The infrared fill light device is controlled by the schematic diagram of fig. 2, and is turned off at the time of T1 and turned on at the time of T2. Taking a 25-frame video as an example, T =40ms, assuming that the effective exposure time T2 = 15ms, then T1 = T-T2 = 40-15 = 25 ms. In a common method, the infrared light supplement lamp device is continuously and normally on, 25ms of infrared lamp power consumption is lost, the infrared light supplement lamp device can meet the brightness requirement without working at full power within T2 time, and PWM duty ratio control is performed, so that the energy consumption of the infrared light supplement lamp device is further reduced.
FIG. 4 is a timing chart of automatic exposure adjustment, in which the automatic exposure adjustment is divided into three segments, the first segment is a bright environment, at this time, the PWM duty of the infrared fill light device is MIN, the gain of the photosensitive chip is MIN, and only the exposure time is adjusted; the second section is a darker environment, the exposure time is adjusted to MAX, the gain of the photosensitive chip is MIN, and the PWM duty of the infrared light supplement lamp device is adjusted at the moment; the third section is a dark environment, the exposure time and the WM duty of the infrared light supplement lamp device are MAX, and the gain of the photosensitive chip is adjusted at the moment. The three-section adjustment is based on the dynamic adjustment of the brightness of the picture obtained by a program.
FIG. 5 is a graph of photo chip image brightness versus PWM output duty cycle, here the final manifestation of experimental data. Acquiring experimental data: in a full-black environment, the exposure time is constant, the gain of a photosensitive chip is constant, the image brightness values output by different infrared light supplement lamp devices PWM duty (1-100) are collected at distances of 30cm, 50cm, 80cm and the like respectively under a white scene to form a set of points, a trend curve is drawn from the collected data point set, a polynomial formula is fitted, and the duty ratio of PWM is dynamically adjusted in an ISP (Internet service provider) according to the formula to obtain the proper image brightness. The relation between the image brightness and the PWM duty ratio is y = -1.1048x + 70.031x-90.155, y is the image brightness, x is the PWM duty ratio, R in the graph is the goodness of fit, the closer to 1, the better the degree of fit is, and R =0.9947 is illustrated.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (3)
1. A system and a method for dynamically supplementing light for an infrared lamp of a camera are characterized in that: the following hardware is included:
the photosensitive chip is used for detecting the image information of the shot picture and judging the brightness degree of the picture;
the ISP image processing module is used for receiving the signal fed back by the photosensitive chip, processing image information and outputting a light supplement control signal;
the PWM control module is used for receiving the control signal output by the ISP image module and outputting a light supplement driving signal with different duty ratios;
the infrared light supplement lamp device is used for receiving light supplement driving signals with different duty ratios and emitting light supplement with different brightness;
the method comprises the following steps:
s1, enabling ambient light to enter the photosensitive chip through the lens, and exposing the photosensitive chip;
s2, when the ambient light is bright, the photosensitive chip obtains the target brightness image output by adjusting the line exposure; when the ambient light brightness is dark, the line exposure time of the photosensitive chip is adjusted to be maximum, and the target brightness cannot be obtained, light is supplemented;
s3, controlling and outputting different duty ratios through the PWM control module to achieve the purpose of adjusting the intensity of the infrared light supplement lamp device, supplementing ambient light and enabling the photosensitive chip to obtain an image output of target brightness;
and S4, performing gain adjustment on the photosensitive chip, wherein when the infrared light supplement lamp device supplements light to the utmost, the photosensitive chip performs gain adjustment, and the higher the gain of the photosensitive chip is, the higher the picture brightness is.
2. The system and the method for dynamically supplementing light to the infrared lamp of the camera according to claim 1, wherein: in step S3, the method further includes performing synchronization through the Vsync signal of the photosensitive chip, performing light supplement in a time region where the photosensitive chip performs exposure, and turning off the infrared light supplement lamp device in a non-exposure time region.
3. The system and the method for dynamically supplementing light to the infrared lamp of the camera according to claim 2, wherein: in the step S3, the relation between the image brightness and the PWM duty ratio is y = -1.1048x + 70.031x-90.155, y is the image brightness, and x is the PWM duty ratio.
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| CN201911314367.XA CN113014748A (en) | 2019-12-19 | 2019-12-19 | Camera infrared lamp dynamic light supplementing system and method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113691776A (en) * | 2021-08-18 | 2021-11-23 | 南京领行科技股份有限公司 | In-vehicle camera system and light supplementing method |
| CN113709346A (en) * | 2021-08-27 | 2021-11-26 | 北京八分量信息科技有限公司 | Big data monitoring system based on decentralization |
| CN115590453A (en) * | 2022-12-13 | 2023-01-13 | 杭州康基医疗器械有限公司（Cn） | Intelligent exposure adjusting system and method in endoscopic surgery |
| CN116141617A (en) * | 2022-12-28 | 2023-05-23 | 河北润驰流体科技有限公司 | Extrusion molding process for hose production |
| CN117641647A (en) * | 2023-12-18 | 2024-03-01 | 大庆思特传媒科技有限公司 | Infrared intelligent light supplementing device and method |
| CN117835016A (en) * | 2024-03-06 | 2024-04-05 | 厦门瑞为信息技术有限公司 | Device and method for removing infrared exposure frames of double-pass RGB lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113691776A (en) * | 2021-08-18 | 2021-11-23 | 南京领行科技股份有限公司 | In-vehicle camera system and light supplementing method |
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| CN116141617A (en) * | 2022-12-28 | 2023-05-23 | 河北润驰流体科技有限公司 | Extrusion molding process for hose production |
| CN117641647A (en) * | 2023-12-18 | 2024-03-01 | 大庆思特传媒科技有限公司 | Infrared intelligent light supplementing device and method |
| CN117835016A (en) * | 2024-03-06 | 2024-04-05 | 厦门瑞为信息技术有限公司 | Device and method for removing infrared exposure frames of double-pass RGB lens |
| CN117835016B (en) * | 2024-03-06 | 2024-04-30 | 厦门瑞为信息技术有限公司 | Device and method for removing infrared exposure frames of double-pass RGB lens |
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