CN114422716A - Method for realizing night vision light supplement self-matching of automatic zoom camera based on double lampwicks - Google Patents
Method for realizing night vision light supplement self-matching of automatic zoom camera based on double lampwicks Download PDFInfo
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- 230000004297 night vision Effects 0.000 title claims abstract description 29
- 241000217776 Holocentridae Species 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000012544 monitoring process Methods 0.000 claims abstract description 9
- 230000000694 effects Effects 0.000 abstract description 15
- 230000007547 defect Effects 0.000 abstract description 5
- 230000002349 favourable effect Effects 0.000 abstract description 2
- 230000001502 supplementing effect Effects 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/67—Focus control based on electronic image sensor signals
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Abstract
The invention discloses a method for realizing night vision light supplement self-matching of an automatic zoom camera based on double lampwicks, and relates to the technical field of intelligent security monitoring. The invention comprises the following steps: s1 starting a zooming stage of the automatic zoom lens; s2 obtaining the position of zoom motor; s3 self-matching the field angle of the current lens under the focal length millimeter and the light supplement angle of the double lampwicks; s4, obtaining the type of the light supplement light source configured by the current user; s5 starting the double-wick light supplement lamp set; and S6 zoom lens automatic focusing stage. The automatic zoom camera fully utilizes the light supplement performance of the light supplement lamp, so that images with different focal lengths and millimeter numbers can obtain better light supplement effect, the automatic zoom camera is favorable for improving the speed and accuracy of automatic focusing, and more ideal image effect is realized. The multi-scene practicability and compatibility of the camera are improved, and the defects that the light supplement at the night vision telephoto end of the existing automatic zooming camera is insufficient and the type of the light supplement light source is single are effectively overcome.
Description
Technical Field
The invention belongs to the technical field of intelligent security monitoring, and relates to a method for realizing night vision light supplement self-matching of an automatic zoom camera based on double lampwicks.
Background
The automatic zooming camera has important application in the field of video monitoring, and the current automatic zooming camera has the following two defects in the monitoring scene with low light illumination: 1. the luminous intensity and the luminous angle of the light filling lamp are fixed and single, and cannot be automatically adjusted according to the focal length of the camera, so that the images of a short-focus scene and a long-focus scene cannot be simultaneously well achieved. The wide-angle light filling camera is dispersed in light filling under a long-focus far-field scene, light penetration is not strong, so that the whole image is dark and unclear, noise is high, the image effect cannot meet the monitoring requirement, and the automatic focusing difficulty is high. Although the light supplement of the long-focus scene is improved and the image effect is improved, the flashlight effect is caused due to the fact that the light supplement angle is obviously smaller than the image field angle under the short-focus scene, and the image effect is poor.
2. Most automatic camera light filling lamps that zoom are single in light source type, can not satisfy different scenes to the different demands of infrared light and visible light filling, and the camera that possesses the light filling lamp of multiple light source type is bulky, and the hardware is with high costs and do not install well.
Disclosure of Invention
In order to make up the defect that the conventional automatic zoom camera cannot meet the night vision light supplement requirements of different focal length sections and different scenes at the same time, the invention provides a method for realizing the self-matching of the night vision light supplement of the automatic zoom camera based on double lampwicks. The invention is realized by the following technical scheme: the invention provides a method for realizing night vision supplementary lighting self-matching of an automatic zoom camera based on double lampwicks, which comprises the following steps:
s1 starting a zooming stage of the automatic zoom lens;
s2 obtaining the position of zoom motor;
s3 self-matching the field angle of the current lens under the focal length millimeter and the light supplement angle of the double lampwicks;
s4, obtaining the type of the light supplement light source configured by the current user;
s5 starting the double-wick light supplement lamp set;
and S6 zoom lens automatic focusing stage.
Preferably, the step S1 automatically magnifies the zoom lens to activate the zoom unit, and changes the relative position of each lens in the zoom lens by controlling the zoom motor drive of the lens to change the focal length of the lens by several millimeters, thereby changing the angle of view of the camera.
Preferably, in step S2, the zoom motor position obtaining unit, the focal length change of the automatic zoom lens is driven by a stepping motor, the lens is powered on for the first time, and the PI points, i.e. the origin, of the zoom motor and the focus motor are obtained by self-checking, the current number of steps of the zoom motor relative to the PI points is read in real time during the zooming process, and the number of mm of the focal length corresponding to the current number of steps of the motor is known from the step focusing curve of the zoom lens provided by the lens manufacturer.
As a preferred scheme, in step S3, the self-matching unit for the field angle and the dual-wick fill-in light angle at the current lens focal length by millimeter is configured to select and match the dual-wick fill-in light lamps with different powers and the lamp cups with different angles according to the field angles with different millimeters of the zoom lens.
As a preferred scheme, step S4 includes acquiring a light source type unit of a light supplement lamp configured by a current user, and configuring double-wick light supplement for night vision of a camera, where the light source type of the light supplement lamp is set to be selectable, that is, the light supplement type in the night vision mode is visible light supplement and infrared supplement, the two light supplement modes can be manually switched, the user can select different types of light sources for light supplement according to different scene requirements, and the light source type of the light supplement lamp configured by the current user is acquired through the unit.
Preferably, in the step S5, the dual-wick fill light group turning-on unit is configured to separately control the infrared light source and the visible light source of the dual-wick, and turn on the infrared light source or the visible light source corresponding to the fill light group according to the type of the fill light source obtained in the step S4 and the fill light group to be turned on obtained in the step S3.
Preferably, in step S6, the zoom lens is an autofocus unit, and after the light source is stabilized, the focus motor of the lens is controlled by an autofocus algorithm to perform autofocus to obtain a clear monitoring picture.
The invention has the beneficial effects that:
the method of the invention makes the automatic zoom camera fully utilize the light supplement performance of the light supplement lamp, and makes the images under different focal length millimeter numbers obtain better light supplement effect, thereby improving the brightness and definition of the images, reducing noise, being beneficial to improving the speed and accuracy of automatic focusing and realizing more ideal image effect. The user can also open the light supplement of the visible light or infrared light supplement lamp according to different scene requirements. The multi-scene practicability and compatibility of the camera are improved, and the defects that the light supplement at the night vision telephoto end of the existing automatic zooming camera is insufficient and the type of the light supplement light source is single are effectively overcome.
According to the invention, the double-wick light supplement lamps with different angles and different powers are combined and matched, so that the light supplement lamp with a specific angle is started according to the current focal length millimeter number of the camera, the purpose that the light supplement angle of the light supplement lamp is matched with the image field angle under the current focal length is achieved, the light supplement performance of the light supplement lamp is fully utilized, and the image effect meets the monitoring requirements of each scene; adopt two wick light filling lamps to carry out the mode of light filling, compare in the single camera of night vision light filling light source type, can satisfy the light filling demand of different scenes of user to different types of light sources, compare in the two light source cameras of the independent wick in visible light and infrared, equipment is small, saves the hardware cost and easily installs.
According to the invention, the mode that the light supplementing lamp groups with different angles and different powers are self-matched with the field angles at different focal lengths is adopted, and the different light supplementing lamp groups are started at different focal lengths and millimeter numbers, so that the light emitting angle of the light supplementing lamp is matched with the field angle at the current focal length multiple, the light supplementing performance of the light supplementing lamp is fully utilized, the images at different focal lengths and millimeter numbers can achieve the best effect, and the automatic focusing speed and accuracy can be improved.
The novel technology realizes the night vision light supplement self-matching method of the automatic zooming camera based on the double lampwicks, the lamp sets with different angles and different powers are adopted for light supplement aiming at images with different focal lengths and millimeter numbers, the light supplement mode of the double lampwicks is adopted to meet the requirements of different light supplement light source types of different scenes, so that the best image effect is achieved, the automatic focusing speed and the accuracy of the camera are improved, and the defect that the image effect is poor due to night vision light supplement of the existing automatic zooming camera is effectively overcome.
The light supplement lamp and the sensor are arranged in different shells and keep a certain distance, so that the interference of the reflection of objects such as dust and the like which are close to the lens in the air to the night vision image picture can be effectively weakened, the heat dissipation of the sensor and the light supplement lamp is facilitated, and the problem of image noise increase caused by overhigh temperature of the sensor is solved.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a flow chart of a method for realizing night vision light supplement self-matching of an automatic zoom camera based on double lampwicks.
Fig. 2 is a distribution diagram of a fill-in light of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
The attached drawing is a specific embodiment of the method for realizing the night vision light supplement self-matching of the automatic zoom camera based on the double lampwicks. This embodiment comprises the steps of:
s1 starting a zooming stage of the automatic zoom lens;
s2 obtaining the position of zoom motor;
s3 self-matching the field angle of the current lens under the focal length millimeter and the light supplement angle of the double lampwicks;
s4, obtaining the type of the light supplement light source configured by the current user;
s5 starting the double-wick light supplement lamp set;
and S6 zoom lens automatic focusing stage.
Step S1 is to activate the zoom unit of the auto-zoom lens, change the focal length of the lens by changing the relative position of each lens in the zoom lens by controlling the zoom motor drive of the lens, thereby changing the angle of view of the camera. In the present embodiment, the operation of triggering zooming includes two types, namely manual zooming and preset point calling, and the zooming operation is to change the focal length of the lens.
And step S2, the focal length of the zoom lens is changed by the position obtaining unit of the zoom motor, the lens is electrified for the first time, the PI point, namely the original point, of the zoom motor and the focus motor is obtained by self-checking, the step number of the current zoom motor relative to the PI point is read in real time in the zooming process, and the focal length millimeter number corresponding to the step number of the current motor is obtained in the step focusing curve of the zoom lens provided by a lens manufacturer.
And step S3, selecting and matching the types of the double-wick light supplement lamps with different powers and the lamp cups with different angles according to the field angles of different millimeters of the zoom lens by the field angle and double-wick light supplement angle self-matching unit under the current lens focal length millimeter number.
The double-lamp-wick combines two lamp wicks with different wave band spectrums in the same bulb shell, so that the function that the same light supplement lamp can emit two lights with different spectrums is achieved, such as infrared light and visible light, the wavelength or color temperature of a light source can be determined according to actual requirements, in the embodiment, the light emitting wavelength of the infrared light of the double lamp wicks is in the range of 840 and 860nm, and the color temperature of the visible light is in the range of 4000-5000K.
The wide-angle end of the lens is large in visual angle, large-angle lamp cup combinations such as 120-degree, 100-degree and 90-degree lamp cups are needed to be matched, the telephoto end of the lens is small in visual angle, small-angle lamp cup combinations such as 30-degree and 15-degree lamp cups are needed to be matched, the middle focal length section of the lens is selected to be a lamp cup combination with moderate degree, such as 45-degree and 60-degree lamp cups, and lamp cups and lamp wicks with different degrees are distributed symmetrically around the central axis of the image, so that uniform light supplement is realized. The specific matching combination needs to be determined according to the focal length range of the selected lens and the actual effect of the image, so that the obtained matching relation between the current focal length and the lamp cup degrees of the light supplement lamp set is obtained, and the light supplement lamp set with the corresponding degrees and power which needs to be started at present is obtained through the corresponding focal length millimeter number of the current zoom motor obtained in the step 2.
Because the irradiation distance of the telephoto end is longer, a light supplementing lamp wick with power larger than that of the wide-angle end can be selected. The selection of the light supplement lamp core power and the lamp cup angle needs to be determined according to the image effect of the test of an actual scene, the longer the focal length millimeter number is, namely, the larger the multiple, the smaller the image field angle is, the smaller the selected light supplement lamp angle is, the larger the power is, and attention needs to be paid to the fact that under the condition that the light supplement performance is fully utilized by the focal length millimeter number and the image brightness and definition are ideal, the dark angle or the flashlight effect cannot occur to the image.
In this embodiment, the focal length range of the selected lens is 2.7-13.5 mm, the distribution of the fill-in lamps is as shown in fig. 2, the lamp cups of the first group of fill-in lamps are 90 degrees, and the power is 1.5W; the lamp cup of the second group of light supplement lamps is 60 degrees, and the power is 1.5W; the lamp cup of the third group of light supplement lamps is 45 degrees, and the power is 2W; the light supplement lamp group at each angle comprises 6 double lampwicks. The first group of light supplement lamps are selected in the focal length section of 2.7-5 mm, the first group and the second group of light supplement lamps are selected in the focal length section of 5 mm-10 mm, the second group and the third group of light supplement lamps are selected in the focal length section of 10-13.5 mm, and the light supplement lamp group with the corresponding degree and power which needs to be started at present is obtained through the focal length millimeter number of the current lens obtained in the step S2 and the configuration.
The light filling lamp can be put in same casing with sensor (sensor), also can put in solitary casing under sensor and there is certain interval with sensor, compare in the design of sensor and light filling lamp in same casing, the advantage that light filling lamp and sensor exist certain interval is that can effectively weaken the reflection of light that exists in the air apart from the very little particle objects such as dust of camera lens interference to night vision image, be favorable to the heat dissipation of sensor and light filling lamp simultaneously, avoid the image noise point that the sensor high temperature arouses to increase the problem. In this embodiment, as shown in fig. 2, the fill light is placed in a separate housing, and is located at a distance of about 50mm from the sensor housing directly below the sensor.
Step S4, a light source type unit of a light supplement lamp configured by a current user is obtained, a double-wick light supplement configuration is adopted for night vision of the camera, the light source type of the light supplement lamp is set to be optional, namely the light supplement type of a night vision mode is visible light supplement and infrared light supplement, the two light supplement modes can be switched manually, the user can select different types of light sources for light supplement according to different scene requirements, and the light supplement light source type configured by the current user is obtained through the unit.
And step S5, a double-wick fill light group starting unit, wherein the infrared light source and the visible light source of the double wicks are controlled independently, and the infrared light source or the visible light source corresponding to the fill light group is started according to the type of the fill light source obtained in the step S4 and the fill light group which needs to be started and is obtained in the step S3.
And step S6, zooming the lens automatic focusing unit, and controlling a focus motor of the lens to perform automatic focusing through an automatic focusing algorithm to obtain a clear monitoring picture after the light compensating light source is stabilized. In this embodiment, the automatic focusing of the lens is realized by using a hill-climbing algorithm of local search extremum.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (7)
1. The method for realizing the night vision light supplement self-matching of the automatic zoom camera based on the double lampwicks is characterized by comprising the following steps of:
s1 starting a zooming stage of the automatic zoom lens;
s2 obtaining the position of zoom motor;
s3 self-matching the field angle of the current lens under the focal length millimeter and the light supplement angle of the double lampwicks;
s4, obtaining the type of the light supplement light source configured by the current user;
s5 starting the double-wick light supplement lamp set;
and S6 zoom lens automatic focusing stage.
2. The method for realizing night vision supplementary lighting self-matching of the automatic zoom camera based on the double lampwicks as claimed in claim 1, which is characterized in that: step S1 is to activate the zoom unit of the auto-zoom lens, change the focal length of the lens by changing the relative position of each lens in the zoom lens by controlling the zoom motor drive of the lens, thereby changing the angle of view of the camera.
3. The method for realizing night vision supplementary lighting self-matching of the automatic zoom camera based on the double lampwicks as claimed in claim 2, which is characterized in that: and step S2, the focal length of the zoom lens is changed by the position obtaining unit of the zoom motor, the lens is electrified for the first time, the PI point, namely the original point, of the zoom motor and the focus motor is obtained by self-checking, the step number of the current zoom motor relative to the PI point is read in real time in the zooming process, and the focal length millimeter number corresponding to the step number of the current motor is obtained in the step focusing curve of the zoom lens provided by a lens manufacturer.
4. The method for realizing night vision supplementary lighting self-matching of the automatic zoom camera based on the double lampwicks as claimed in claim 3, which is characterized in that: and step S3, selecting and matching the types of the double-wick light supplement lamps with different powers and the lamp cups with different angles according to the field angles of different millimeters of the zoom lens by the field angle and double-wick light supplement angle self-matching unit under the current lens focal length millimeter number.
5. The method for realizing night vision supplementary lighting self-matching of the automatic zoom camera based on the double lampwicks as claimed in claim 4, which is characterized in that: step S4, a light source type unit of a light supplement lamp configured by a current user is obtained, a double-wick light supplement configuration is adopted for night vision of the camera, the light source type of the light supplement lamp is set to be optional, namely the light supplement type of a night vision mode is visible light supplement and infrared light supplement, the two light supplement modes can be switched manually, the user can select different types of light sources for light supplement according to different scene requirements, and the light supplement light source type configured by the current user is obtained through the unit.
6. The method for realizing night vision supplementary lighting self-matching of the automatic zoom camera based on the double lampwicks as claimed in claim 5, which is characterized in that: and S5, turning on a unit U5 of the double-wick light supplement lamp group, wherein the infrared light source and the visible light source of the double wicks are controlled independently, and the infrared light source or the visible light source corresponding to the light supplement lamp group is turned on according to the type of the light supplement light source obtained in the S4 and the light supplement lamp group needing to be turned on obtained in the S3.
7. The method for realizing night vision supplementary lighting self-matching of the automatic zoom camera based on the double lampwicks as claimed in claim 6, which is characterized in that: and step S6, zooming the lens automatic focusing unit, and controlling a focus motor of the lens to perform automatic focusing through an automatic focusing algorithm to obtain a clear monitoring picture after the light compensating light source is stabilized.
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