CN107643591B - Anti-attenuation fog-penetrating visible light lens and implementation method - Google Patents
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Abstract
The invention discloses an anti-attenuation fog-penetrating visible light lens and an implementation method thereof, wherein light rays are incident from front to back in an optical system, and a front fixed group with positive focal power, a zoom group with negative focal power, a compensation group with negative focal power, a rear fixed group with positive focal power and a cut-off filter group are sequentially arranged, so that when a camera is used in foggy days, imaging light rays are near infrared light, and a fog-penetrating filter with 0.76um to 0.9um is added. When the camera is used in daytime, imaging light is visible light, and a 0.76um-0.9um fog-penetrating filter cannot be used. In the switching process of the 0.76um-0.9um fog-penetrating filter, the position of the imaging surface changes, and a compensation optical path sheet is added for eliminating the change. The method combines the optical fog transmission method and the electronic fog transmission method, realizes real fog transmission treatment, has universal and simple lens design, adopts the most advanced fog transmission algorithm in the electronic treatment, and has better popularization.
Description
Technical Field
The invention belongs to the technical field of photoelectricity, and particularly relates to an anti-attenuation fog-penetrating visible light lens and an implementation method thereof, which can acquire clear images in a foggy environment.
Background
Along with the increasing deterioration of daily environment, in haze weather, the contrast of an image monitored by a video monitoring system mainly comprising a common lens becomes low, the color becomes dark, the image attenuation is serious, the observation effect on a target is affected, and the detail of the target cannot be effectively identified and observed.
The development of video monitoring cameras requires not only "see clearly" but also "see far" observation effects in good environments. And the same detection capability and definition in a haze environment are required. There are two common methods of mist penetration: one is an optical lens fog-penetrating design, which uses the principle of diffraction of micro particles by near infrared rays (wavelength 0.76 μm-1.1 μm) to improve the definition of pictures. One is an image processing fog-penetrating technology, which mainly improves the quality of the acquired image through various algorithms. The two methods are combined to realize real fog penetration, and how to efficiently improve the fog penetration quality of remote observation on a long-focus lens is key.
Disclosure of Invention
The anti-attenuation fog-penetrating visible light lens is convenient to adjust and simple in structure, light signals are prevented from being attenuated through an optical structure in fog weather, relative aperture is increased, field curvature is reduced, illuminance of an image plane is increased, images are clearer, and long-focus lens long-distance observation fog-penetrating quality is improved.
The invention further provides a realization method of the anti-attenuation fog-penetrating visible light lens, and after the optical fog-penetrating adjustment is carried out on the lens, the electronic fog-penetrating adjustment is carried out on the image, so that the real fog penetration is realized.
In order to achieve the above purpose, the invention adopts the technical scheme that: in the optical system of the anti-attenuation fog-penetrating visible light lens, light rays are incident from front to back, and a front fixed group with positive focal power, a variable-magnification group with negative focal power, a compensation group with negative focal power, a rear fixed group with positive focal power and a cut-off filter group are sequentially arranged; the front fixing group consists of a first negative lens, a first positive lens, a second negative lens and a second positive lens which are sequentially arranged from front to back, wherein the first negative lens and the first positive lens are glued together; the zoom group consists of a first meniscus lens, a first biconvex lens and a second biconcave lens which are sequentially arranged from front to back, wherein the first biconvex lens and the second biconcave lens are glued together; the compensation group consists of a third positive lens, a third negative lens, a fourth positive lens and a fifth positive lens which are sequentially arranged from front to back, wherein the third negative lens and the fourth positive lens are glued together; the rear fixing group consists of a third biconcave lens, a second biconvex lens, a second crescent lens, a third crescent lens and a third biconvex lens which are sequentially arranged from front to back, wherein the third biconcave lens and the second biconvex lens are glued together, and the third crescent lens and the third biconvex lens are glued together; the cut-off filter group comprises a near infrared cut-off filter and a compensation optical path sheet which are sequentially arranged from top to bottom; the air interval between the front fixed group and the variable-magnification group is 4-138.7 mm, the air interval between the compensation group and the rear fixed group is 62.99-11.25 mm, a diaphragm is arranged between the compensation group and the rear fixed group, and the air interval between the rear fixed group and the cut-off filter group is 30mm; the near infrared cut-off filter and the compensation optical path sheet are respectively provided with a filter moving device and a limit switch, the cut-off filter group moves up and down along the direction vertical to the optical axis, the compensation optical path sheet is moved into the optical path when the near infrared cut-off filter is used in daytime, and the near infrared filter is moved into the optical path when the near infrared cut-off filter is used in foggy days.
Further, an air interval between the first negative lens, the first positive lens and the second negative lens glued in the front fixed group is 4mm, an air interval between the second negative lens and the second positive lens is 4.3mm, an air interval between the first meniscus lens and the first biconcave lens in the variable magnification group is 2.6mm, an air interval between the first biconvex lens and the first biconvex lens glued lens is 2.6mm, an air interval between the third positive lens and the third negative lens in the compensation group and the third negative lens glued lens and an air interval between the fourth positive lens in the compensation group is 0.35mm, an air interval between the fifth positive lens and the fourth positive lens in the compensation group is 0.3mm, a diaphragm is arranged in front of the third biconcave lens, the second biconvex lens glued lens in the rear fixed group, an air interval between the second biconvex lens and the second biconvex lens glued lens is 13.9mm, and an air interval between the second biconvex lens and the third biconvex lens glued by a third tooth is 1.58mm.
The near infrared cut-off filter is a fog-penetrating filter with 0.76um to 0.9 um.
In order to solve the requirement of long-distance monitoring of a target by a long-focus camera in a foggy environment, the realization method of the anti-attenuation fog-penetrating visible light lens performs the following image processing from two aspects of optical fog penetration and electronic fog penetration:
in the aspect of optical fog penetration, in order to meet the requirement of resolution of a high-definition camera, a lens is designed according to a mathematical model of foggy-day image plane illumination, and the mathematical model is as follows:
wherein, the aperture function of the sky is g (lambda), ealpha (lambda) is the atmospheric scattering coefficient, beta is the illuminance when the target distance is 0, EF (lambda) is the ambient illuminance, d is the target distance, and an ultra-low dispersion optical material is selected to ensure that the internal transmittance is more than 98 percent; enabling the lens to image in a wide spectral range; selecting a fog-penetrating filter with the wavelength of 0.76-0.9 mu m for aberration correction, so that the lens forms a lens in a near infrared band to meet the resolution requirement of a high-definition camera;
the evaluation of aberration improves the imaging capability of the objective lens according to the characteristic of the target contrast in foggy days, the MTF of the low-frequency part is more than 90%, the MTF of the medium-frequency part is more than 80%, and the MTF of the high-frequency part is more than 30%, so that the imaging quality in foggy days is excellent, meanwhile, in order to meet the imaging requirement in daytime, aberration correction is carried out on F light D light C light,
the ultra-wideband antireflection film is plated on the optical part, the transmissivity of the wave band range of 0.47um-0.9um is improved, the optical signal attenuation is prevented, the relative aperture is increased, the field curvature is reduced, the image plane illuminance is increased, the image is clearer, so that the focal length F1' of the front fixed group is 174.39mm, and the zoom magnification g is as follows for a zoom system:
beta in B And beta B ' is the magnification of the zoom group before and after the change, beta c And beta c ' is the magnification before and after the change of the compensation group; the focal length of the zoom group is F2% = -16.94mm; focal length F3' = 41.39mm of the compensation group;
the image plane illuminance at the time of optical system design is:
E(λ)＝E 0 (λ)×T 0 (d)×B(λ)
t in 0 (d) B (lambda) is the spectral response coefficient of the photoelectric conversion device, E 0 (lambda) is foggy day image plane illuminance;
in the aspect of electronic fog penetration, image signal processing is carried out on a main video processing chip of a video camera, and the image quality is adjusted by utilizing an algorithm;
firstly, collecting image signals, performing photoelectric signal conversion on the video signals, performing statistics and evaluation on automatic exposure, automatic focusing and automatic white balance continuously through a 3A algorithm and a control circuit, and collecting numerical information;
then extracting the acquired image histogram information, judging the distribution condition of the histogram and the environment haze concentration condition according to the change trend of the histogram, and adjusting the gray value of the image by using a histogram equalization algorithm;
finally, carrying out overall fog penetration adjustment on the image by using a He's dark channel defogging algorithm, and forming a model through a fog pattern:
I(x)＝J(x)T(x)+A(1-T(x))
wherein I (x) is a fog-penetrating image, J (x) is a fog-penetrating image, T (x) is transmissivity, and A is an atmospheric light component; and performing image restoration processing, wherein an image restoration formula is as follows:
and outputting the image for display after the image recovery processing.
The invention has the beneficial effects that: the invention provides a design and an implementation method of a long-focus lens anti-attenuation fog-penetrating lens. The method combines the optical fog transmission method and the electronic fog transmission method, realizes real fog transmission treatment, has universal and simple lens design, adopts the most advanced fog transmission algorithm in the electronic treatment, and has better popularization.
Plating an ultra-wideband antireflection film on the optical part, improving the transmittance of the wave band range of 0.47um to 0.9um, and preventing the optical signal from being attenuated; the light path system is added with a stray light eliminating diaphragm; reducing stray light from entering an imaging optical path and reducing vignetting during optical path calculation.
When the camera is used in foggy days, imaging light rays are near infrared light, so that a 0.76um-0.9um fog-penetrating filter is added. When the camera is used in daytime, imaging light is visible light, and a 0.76um-0.9um fog-penetrating filter cannot be used. In the switching process of the 0.76um-0.9um fog-penetrating filter, the position of the imaging surface changes. To eliminate this variation, a compensating optical path sheet is added.
With the increase of the manufacturing level of the CCD, the CMOS and the technology, the pixel size can be several micrometers, which requires the resolution of the lens to be high, namely, the MTF in the high-frequency part should be larger than 0.3. The invention provides an optical system design with the following image plane illumination:
E(λ)＝E 0 (λ)×T 0 (d)×B(λ)
thus, the contrast of target imaging with lower brightness can be improved, and the image signal processing burden is reduced.
Drawings
Fig. 1 is a diagram of a normal environment state optical system.
Fig. 2 is a diagram of a short focal length state optical system.
Fig. 3 is a diagram of an optical system in a mid-focal length state.
Fig. 4 is a diagram of a long focal length state optical system.
Fig. 5 is a normal environment mode MTF graph.
Fig. 6 is a fog-penetrating environmental mode MTF graph.
Fig. 7 is a flowchart of image processing data.
Detailed Description
The anti-attenuation fog-penetrating visible light lens as shown in fig. 1-4, wherein light rays are incident from front to back, and a front fixed group A with positive focal power, a variable-magnification group B with negative focal power, a compensation group C with negative focal power, a rear fixed group D with positive focal power and a cut-off filter group E are sequentially arranged; the front fixing group A consists of a first negative lens A-1, a first positive lens A-2, a second negative lens A-3 and a second positive lens A-4 which are sequentially arranged from front to back, wherein the first negative lens A-1 and the first positive lens A-2 are glued together; the variable magnification group B consists of a first meniscus lens B-1, a first biconcave lens B-2, a first biconvex lens B-3 and a second biconcave lens B-4 which are sequentially arranged from front to back. Wherein the first biconvex lens B-3 and the second biconcave lens B-4 are cemented together; the compensation group C consists of a third positive lens C-1, a third negative lens C-2, a fourth positive lens C-3 and a fifth positive lens C-4 which are sequentially arranged from front to back. Wherein the third negative lens C-2 and the fourth positive lens C-3 are cemented together; the rear fixing group D consists of a third biconcave lens D-1, a second biconvex lens D-2, a second crescent lens D-3, a third crescent lens D-4 and a third biconvex lens D-5 which are sequentially arranged from front to back, wherein the third biconcave lens D-1 and the second biconvex lens D-2 are glued together, and the third crescent lens D-4 and the third biconvex lens D-5 are glued together; the cut-off filter group E comprises a near infrared cut-off filter E-1 and a compensation optical path piece E-2 which are sequentially arranged from top to bottom; the air interval between the front fixed group A and the variable-magnification group B is 4-138.7 mm, the air interval between the compensation group C and the rear fixed group D is 62.99-11.25 mm, a diaphragm F is arranged between the compensation group C and the rear fixed group D, and the air interval between the rear fixed group D and the cut-off filter group is 30mm; the variable-magnification group B moves back and forth along the optical axis, the compensation group C moves back and forth along the optical axis, the movement directions of the variable-magnification group B and the compensation group C are opposite, the near infrared cut-off filter E-1 and the compensation optical path piece E-2 are respectively provided with a filter moving device and a limit switch, the cut-off filter group moves up and down along the direction of the vertical optical axis, the compensation optical path piece E-2 is moved into the optical path when the variable-magnification group B is used in daytime, and the near infrared filter E-1 is moved into the optical path when the variable-magnification group B is used in foggy weather.
The air interval between the first negative lens A-1, the first positive lens A-2 and the second negative lens A-3 in the front fixing group A is 4mm, the air interval between the second negative lens A-3 and the second positive lens A-4 is 4.3mm, the air interval between the first meniscus lens B-1 and the first biconcave lens B-2 in the variable magnification group B is 2.6mm, the air interval between the first biconcave lens B-2 and the first biconvex lens B-3 and the second biconcave lens B-4 in the front fixing group A is 2.6mm, the air interval between the third positive lens C-1 and the third negative lens C-2 and the third negative lens C-3 in the compensating group C is 0.35mm, the air interval between the fifth positive lens C-4 and the fourth positive lens C-3 in the cemented lens B-3 is 0.3mm, the air interval between the third biconcave lens B-2 and the second biconvex lens D-3 in the rear fixing group B-2 and the biconvex lens D-4 is 2.9 mm, and the air interval between the third biconvex lens C-3 and the third biconvex lens D-3-4 in the third biconvex lens C-3 is 58mm.
The near infrared cut-off filter is a fog-penetrating filter with 0.76um to 0.9 um.
In this embodiment, the variable magnification group B moves back and forth along the optical axis, and the compensation group C moves back and forth along the optical axis. The motion directions of the zoom group B and the compensation group C are opposite. The filter moving device and the limit switch are arranged, and the cut-off filter group moves up and down along the direction vertical to the optical axis. The compensation optical path sheet E-2 is moved into the optical path when used in daytime, and the near infrared filter E-1 is moved into the optical path when used in foggy days.
The realization method of the anti-attenuation fog-penetrating visible light lens aims at solving the requirement of long-distance monitoring of a target by a long-focus camera in a foggy environment, and performs image processing from two aspects of optical fog penetration and electronic fog penetration:
in the aspect of optical fog penetration, in order to meet the requirement of resolution of a high-definition camera, a lens is designed according to a mathematical model of foggy-day image plane illumination, and the mathematical model is as follows:
wherein, the aperture function of the sky is g (lambda), ealpha (lambda) is the atmospheric scattering coefficient, beta is the illuminance when the target distance is 0, EF (lambda) is the ambient illuminance, d is the target distance, and an ultra-low dispersion optical material is selected to ensure that the internal transmittance is more than 98 percent; enabling the lens to image in a wide spectral range; selecting a fog-penetrating filter with the wavelength of 0.76-0.9 mu m for aberration correction, so that the lens forms a lens in a near infrared band to meet the resolution requirement of a high-definition camera;
the evaluation of aberration improves the imaging capability of the objective lens according to the characteristic of the target contrast in foggy days, the MTF of the low-frequency part is more than 90%, the MTF of the medium-frequency part is more than 80%, and the MTF of the high-frequency part is more than 30%, so that the imaging quality in foggy days is excellent, meanwhile, in order to meet the imaging requirement in daytime, aberration correction is carried out on F light D light C light,
the ultra-wideband antireflection film is plated on the optical part, the transmissivity of the wave band range of 0.47um-0.9um is improved, the optical signal attenuation is prevented, the relative aperture is increased, the field curvature is reduced, the image plane illuminance is increased, the image is clearer, so that the focal length F1' of the front fixed group is 174.39mm, and the zoom magnification g is as follows for a zoom system:
beta in B And beta B ' is the magnification of the zoom group before and after the change, beta c And beta c ' is the magnification before and after the change of the compensation group; the focal length of the zoom group is F2% = -16.94mm; focal length F3' = 41.39mm of the compensation group;
the image plane illuminance at the time of optical system design is:
E(λ)＝E 0 (λ)×T 0 (d)×B(λ)
t in 0 (d) B (lambda) is the spectral response coefficient of the photoelectric conversion device, E 0 (lambda) is foggy day image plane illuminance;
in the aspect of electronic fog penetration, image signal processing is carried out on a main video processing chip of a video camera, and the image quality is adjusted by utilizing an algorithm;
firstly, collecting image signals, performing photoelectric signal conversion on the video signals, performing statistics and evaluation on automatic exposure, automatic focusing and automatic white balance continuously through a 3A algorithm and a control circuit, and collecting numerical information;
then extracting the acquired image histogram information, judging the distribution condition of the histogram and the environment haze concentration condition according to the change trend of the histogram, and adjusting the gray value of the image by using a histogram equalization algorithm;
finally, carrying out overall fog penetration adjustment on the image by using a He's dark channel defogging algorithm, and forming a model through a fog pattern:
I(x)＝J(x)T(x)+A(1-T(x))
wherein I (x) is a fog-penetrating image, J (x) is a fog-penetrating image, T (x) is transmissivity, and A is an atmospheric light component; and performing image restoration processing, wherein an image restoration formula is as follows:
and outputting the image for display after the image recovery processing.
The optical system composed of the lenses achieves the following optical indexes:
1. focal length: f' =85 mm to 850mm
2. Zoom magnification of 10X
3. Maximum relative pore diameter D/f=1/6
4. Maximum angle of view: 2 w=0.6 to 6 degrees
5. The fog-penetrating filter transmits light spectrum: 0.76um-0.9um
In the implementation, the image enters the sensor through the lens to perform photoelectric conversion, and the 3A calculation and control circuit performs uninterrupted statistical evaluation on the 3A information. The histogram equalization algorithm calculates the histogram distribution of the image and adjusts the gray level of the image. The adjusted image is processed by the Defog algorithm of the He's dark channel, and the image can be output after the processing. As can be seen by comparing the MTF curve graph of the normal environment mode of the figure 5 with the MTF curve graph of the fog-penetrating environment mode of the figure 6, the imaging effect of the fog-penetrating lens is close to the imaging quality of the fog-free environment, and the real fog-penetrating treatment is realized.
Claims (4)
1. An anti-attenuation fog-penetrating visible light lens, which is characterized in that: in the optical system of the anti-attenuation fog-penetrating visible light lens, light rays are incident from front to back, and a front fixed group with positive focal power, a zoom group with negative focal power, a compensation group with negative focal power, a rear fixed group with positive focal power and a cut-off filter group are sequentially arranged; the front fixing group consists of a first negative lens, a first positive lens, a second negative lens and a second positive lens which are sequentially arranged from front to back, wherein the first negative lens and the first positive lens are glued together; the zoom group consists of a first meniscus lens, a first biconvex lens and a second biconcave lens which are sequentially arranged from front to back, wherein the first biconvex lens and the second biconcave lens are glued together; the compensation group consists of a third positive lens, a third negative lens, a fourth positive lens and a fifth positive lens which are sequentially arranged from front to back, wherein the third negative lens and the fourth positive lens are glued together; the rear fixing group consists of a third biconcave lens, a second biconvex lens, a second crescent lens, a third crescent lens and a third biconvex lens which are sequentially arranged from front to back, wherein the third biconcave lens and the second biconvex lens are glued together, and the third crescent lens and the third biconvex lens are glued together; the cut-off filter group comprises a near infrared cut-off filter and a compensation optical path sheet which are sequentially arranged from top to bottom; the air interval between the front fixed group and the variable-magnification group is 4-138.7 mm, the air interval between the compensation group and the rear fixed group is 62.99-11.25 mm, a diaphragm is arranged between the compensation group and the rear fixed group, and the air interval between the rear fixed group and the cut-off filter group is 30mm; the near infrared cut-off filter and the compensation optical path sheet are respectively provided with a filter moving device and a limit switch, the cut-off filter group moves up and down along the direction vertical to the optical axis, the compensation optical path sheet is moved into the optical path when the near infrared cut-off filter is used in daytime, and the near infrared filter is moved into the optical path when the near infrared cut-off filter is used in foggy days.
2. The anti-attenuation, fog-penetrating, visible light lens of claim 1, wherein: the air interval between the first negative lens, the first positive lens and the second negative lens in the front fixed group is 4mm, the air interval between the second negative lens and the second positive lens is 4.3mm, the air interval between the first meniscus lens and the first biconcave lens in the variable-magnification group is 2.6mm, the air interval between the first biconcave lens and the first biconvex lens is 2.6mm, the air interval between the third positive lens and the third negative lens in the compensation group and the third negative lens in the fourth positive lens is 0.35mm, the air interval between the fifth positive lens and the fourth positive lens in the gluing lens is 0.3mm, the air interval between the third biconcave lens and the second biconvex lens in the rear fixed group is 13.9mm, and the air interval between the second biconvex lens and the second biconvex lens in the gluing lens is 1.58mm.
3. The anti-attenuation, fog-penetrating, visible light lens of claim 1, wherein: the near infrared cut-off filter is a fog-penetrating filter with 0.76um to 0.9 um.
4. The realization method of the anti-attenuation fog-penetrating visible light lens according to claim 1, for solving the requirement of a long-focus camera on a remote monitoring target in a foggy environment, is characterized by performing the following image processing from the aspects of optical fog penetration and electronic fog penetration:
in the aspect of optical fog penetration, in order to meet the requirement of resolution of a high-definition camera, a lens is designed according to a mathematical model of foggy-day image plane illumination, and the mathematical model is as follows:
wherein, the aperture function of the sky is g (lambda), ealpha (lambda) is the atmospheric scattering coefficient, beta is the illuminance when the target distance is 0, EF (lambda) is the ambient illuminance, d is the target distance, and an ultra-low dispersion optical material is selected to ensure that the internal transmittance is more than 98 percent; enabling the lens to image in a wide spectral range; selecting a fog-penetrating filter with the wavelength of 0.76-0.9 mu m for aberration correction, so that the lens forms a lens in a near infrared band to meet the resolution requirement of a high-definition camera;
the evaluation of aberration improves the imaging capability of the objective lens according to the characteristic of the target contrast in foggy days, the MTF of the low-frequency part is more than 90%, the MTF of the medium-frequency part is more than 80%, and the MTF of the high-frequency part is more than 30%, so that the imaging quality in foggy days is excellent, meanwhile, in order to meet the imaging requirement in daytime, aberration correction is carried out on F light D light C light,
the ultra-wideband antireflection film is plated on the optical part, the transmissivity of the wave band range of 0.47um-0.9um is improved, the optical signal attenuation is prevented, the relative aperture is increased, the field curvature is reduced, the image plane illuminance is increased, the image is clearer, so that the focal length F1' of the front fixed group is 174.39mm, and the zoom magnification g is as follows for a zoom system:
beta in B And beta B ' is the magnification of the zoom group before and after the change, beta c And beta c ' is the magnification before and after the change of the compensation group; the focal length of the zoom group is F2% = -16.94mm; focal length F3' = 41.39mm of the compensation group;
the image plane illuminance at the time of optical system design is:
E(λ)＝E 0 (λ)×T 0 (d)×B(λ)
t in 0 (d) Is permeable to atmosphere in foggy daysOverrate, B (lambda) is the spectral response coefficient of the photoelectric conversion device, E 0 (lambda) is foggy day image plane illuminance;
in the aspect of electronic fog penetration, image signal processing is carried out on a main video processing chip of a video camera, and the image quality is adjusted by utilizing an algorithm;
firstly, collecting image signals, performing photoelectric signal conversion on the video signals, performing statistics and evaluation on automatic exposure, automatic focusing and automatic white balance continuously through a 3A algorithm and a control circuit, and collecting numerical information;
then extracting the acquired image histogram information, judging the distribution condition of the histogram and the environment haze concentration condition according to the change trend of the histogram, and adjusting the gray value of the image by using a histogram equalization algorithm;
finally, carrying out overall fog penetration adjustment on the image by using a He's dark channel defogging algorithm, and forming a model through a fog pattern:
I(x)＝J(x)T(x)+A(1-T(x))
wherein I (x) is a fog-penetrating image, J (x) is a fog-penetrating image, T (x) is transmissivity, and A is an atmospheric light component; and performing image restoration processing, wherein an image restoration formula is as follows:
and outputting the image for display after the image recovery processing.
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| CN111538145B (en) * | 2020-05-12 | 2022-08-16 | Oppo广东移动通信有限公司 | Zoom lens, camera module and electronic device |
| CN112230406B (en) * | 2020-11-04 | 2022-09-16 | 福建福光股份有限公司 | Near-infrared high-definition zooming optical system with strong fog penetration capability |
| CN113589502A (en) * | 2021-07-05 | 2021-11-02 | 湖北华中光电科技有限公司 | Large-visual-field visible light and near-infrared light common-path zooming imaging system |
| CN116165782B (en) * | 2022-12-25 | 2024-03-15 | 福建福光股份有限公司 | 30 times Gao Qingchang focus continuous zoom lens with fog penetrating function |
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