Continuous optical zoom night vision imaging equipment and imaging control method

Abstract

The invention relates to continuous optical zoom night vision imaging equipment and an imaging control method, the continuous optical zoom night vision imaging equipment comprises a wide-angle imaging module, a long-focus imaging module and a control module, and the field angle a of the wide-angle imaging module is larger than the maximum field angle b of the long-focus imaging module; and the control module is used for acquiring field angle change information of the wide-angle imaging module in real time, and calling the long-focus imaging module to acquire a target image when the wide-angle imaging module acquires the target image at a field angle equal to the maximum field angle b of the long-focus imaging module. According to the invention, the long-focus imaging module can be switched in time through the change of the field angle of the wide-angle imaging module to obtain the image so as to obtain a high-quality super-definition image, and the near-infrared filter is further driven to act, so that a visible light image and a low-light night vision image are generated in different scenes, and the use requirements in different scenes are met.

Description

Technical Field

[0001] The present invention relates to the field of imaging equipment, and in particular to a continuous optical zoom night vision imaging equipment and an imaging control method. Background Art

[0002] When using an imaging device mounted on a drone to identify a target at a long distance, it is usually necessary for the imaging device to be able to achieve a high-magnification optical zoom and to be able to capture target images during the day and at night. Therefore, this type of imaging device requires a large-target low-light night vision sensor, which results in a large lens assembly with a large weight, making it unsuitable for small drones to carry and expensive. If an imaging device composed of multiple fixed-focus lenses with different focal lengths, similar to a smartphone, is used, although it can meet the requirement of reducing the size of the device, it cannot achieve continuous zoom, resulting in blurred images when zooming in at high magnifications. Summary of the invention

[0003] The purpose of the present invention is to provide a continuous optical zoom night vision imaging device and an imaging control method, which can timely switch the telephoto imaging module to acquire images according to the change of the field of view angle of the wide-angle imaging module, so as to obtain high-quality ultra-clear images, and further drive the near-infrared filter to operate to support 400-1000nm full-band light input, so as to generate visible light images and low-light night vision images in different scenes, respectively, to meet the usage requirements in different scenes.

[0004] To achieve the above object, the present invention provides the following technical solutions.

[0005] On the one hand, a continuous optical zoom night vision imaging device is provided, comprising: a wide-angle imaging module, a telephoto imaging module and a control module, wherein the field of view angle a of the wide-angle imaging module is greater than the maximum field of view angle b of the telephoto imaging module, and the field of view range corresponding to the field of view angle a of the wide-angle imaging module partially overlaps with the field of view range corresponding to the maximum field of view angle b of the telephoto imaging module;

[0006] The control module is connected to the wide-angle imaging module and the telephoto imaging module respectively, and is used to obtain the field of view angle change information of the wide-angle imaging module in real time, and when the wide-angle imaging module obtains the target image at a field of view angle equal to the maximum field of view angle b of the telephoto imaging module, the telephoto imaging module is called to obtain the image of the target.

[0007] Preferably, the field of view angle a of the wide-angle imaging module is in the range of [60°, 180°], the maximum field of view angle b of the telephoto imaging module is in the range of [30°, 90°], and the minimum field of view angle c is in the range of [8°, 45°].

[0008] Preferably, the telephoto imaging module includes a continuous optical zoom lens with a zoom ratio of 3-11 times and a lens focal length of 15.3mm-49.7mm.

[0009] Preferably, the optical axes of the wide-angle imaging module and the telephoto imaging module are parallel to each other.

[0010] Preferably, the continuous optical zoom night vision imaging device further includes:

[0011] A filter switching module, which has a near-infrared filter, is used to drive the near-infrared filter to move so that the near-infrared filter is located on the propagation path of the light passing through the telephoto imaging module to filter out the near-infrared light in the light; or to drive the near-infrared filter located on the propagation path of the light passing through the telephoto imaging module to move so that the near-infrared filter is completely away from the propagation path of the light passing through the telephoto imaging module.

[0012] Preferably, the wavelength range of the light passing through the telephoto imaging module is 400-1000 nm, and the wavelength range of the near-infrared light is 750-1000 nm.

[0013] Preferably, the continuous optical zoom night vision imaging device also includes: an anti-reflection film, which is attached to the lens surface of the wide-angle imaging module and / or attached to the lens surface of the telephoto imaging module, and the anti-reflection film allows light in the wavelength range of 400 to 1000 nm to pass through, and the light transmittance is [80%, 95%].

[0014] Preferably, the continuous optical zoom night vision imaging device further comprises: a fill light, which is used to provide light with a wavelength range of 800 to 900 nm to the telephoto imaging module, and the field of view of the fill light is adjusted according to Determine, where H is the illumination distance of the fill light; r is the field of view of the fill light; and D is the diameter of the illumination area of ​​the fill light.

[0015] On the other hand, an imaging control method is also provided, which comprises the following steps:

[0016] Acquire the target image through the wide-angle imaging module;

[0017] When the wide-angle imaging module acquires a target image at a field of view angle equal to the maximum field of view angle of the telephoto imaging module, the telephoto imaging module is called to acquire the target image.

[0018] Preferably, the telephoto imaging module acquires an image of the same target including the following steps:

[0019] The near-infrared filter is driven to move by the filter switching module so that the near-infrared filter is located on the propagation path of the light passing through the telephoto imaging module to filter out the near-infrared light in the light;

[0020] And / or, when the near-infrared filter is completely away from the propagation path of the light passing through the telephoto imaging module and no longer filters any light passing through the telephoto imaging module, the fill light is turned on.

[0021] Compared with the prior art, the present invention has the following technical effects:

[0022] The present invention can timely switch the telephoto imaging module to acquire images through the change of the field of view angle of the wide-angle imaging module, and fully utilize the imaging characteristics of the two to obtain high-quality ultra-clear images. The near-infrared filter can be further driven to operate through the filter switching module to support the full-band light input of 400-1000nm, so as to generate visible light images and low-light night vision images in different scenes respectively, to meet the usage requirements in different scenes. At the same time, the light transmittance is improved by the anti-reflection film, and the telephoto imaging module is supplemented with light to improve the light brightness and increase the image quality, so as to meet the high-definition reconnaissance and identification requirements of long-distance targets in the application scenarios of drones. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the continuous optical zoom night vision imaging device in the present invention;

[0024] Figure 2 It is a schematic diagram of the field of view range of the wide-angle imaging module and the telephoto imaging module in the present invention. DETAILED DESCRIPTION

[0025] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0026] Embodiment 1:

[0027] like Figure 1-2 As shown, this embodiment provides a continuous optical zoom night vision imaging device, which includes:

[0028] Wide-angle imaging module 1, the field of view angle a of which ranges from [60° to 180°] (particularly preferably from [80° to 150°]), and the number of pixels is greater than or equal to 12 million;

[0029] A telephoto imaging module 2, wherein the maximum field of view angle b thereof is in the range of [30°, 90°] (particularly preferably [45°, 85°]), the minimum field of view angle c is in the range of [8°, 45°] (particularly preferably [10°, 40°]), and a>b>c, and the telephoto imaging module 2 comprises a continuous optical zoom lens, the zoom ratio of the lens is 3-11 times, and the focal length of the lens is 15.3mm-49.7mm; at the same time, the optical axes of the wide-angle imaging module 1 and the telephoto imaging module 2 are parallel to each other, and the field of view range corresponding to the field of view angle a of the wide-angle imaging module 1 partially overlaps with the field of view range corresponding to the maximum field of view angle b of the telephoto imaging module 2;

[0030] And a control module 3, which is respectively connected to the wide-angle imaging module 1 and the telephoto imaging module 2, and is used to obtain the field of view angle change information of the wide-angle imaging module 1 in real time, and when the wide-angle imaging module 1 obtains the target image at a field of view angle equal to the maximum field of view angle b of the telephoto imaging module 2, the telephoto imaging module 2 is called to obtain the image of the same target.

[0031] Therefore, in this embodiment, high-definition images can be obtained by the wide-angle imaging module 1 during the day (such as the time period of 6:00-18:00) and at night (such as the time period of 18:00-6:00 in the morning). For example, the wide-angle imaging module 1 in this embodiment has a 1-inch, 1 / 1.3-inch large-target low-light night vision sensor, which can obtain high-pixel images of 12 million pixels and above during the day, which can fully display the image details and meet the ultra-high-definition image quality requirements. When acquiring images at night, such as Figure 2 As shown, every 4 pixels are merged into 1 pixel, or every 9 pixels are merged into 1 pixel to improve the sensitivity of a single pixel, increase the nighttime low-light effect, and obtain a full-color night vision image;

[0032] Furthermore, when the current field of view angle of the wide-angle imaging module 1 is reduced to the maximum field of view angle b of the telephoto imaging module 2, the telephoto imaging module 2 is called to obtain a clear target image at a long distance through continuous optical zoom, which is particularly suitable for reconnaissance and identification of long-distance targets in drone application scenarios.

[0033] Embodiment 2:

[0034] The difference between this embodiment and embodiment 1 is that the continuous optical zoom night vision imaging device further includes:

[0035] A filter switching module 4, which has a near-infrared filter 41, and the filter switching module 4 is connected to the telephoto imaging module 2 and is located behind the telephoto imaging module 2, and is used to drive the near-infrared filter 41 to move, so that the near-infrared filter 41 is located on the propagation path of the light passing through the telephoto imaging module 2, so as to filter out the near-infrared light in the light; or, drive the near-infrared filter 41 located on the propagation path of the light passing through the telephoto imaging module 2 to move, so that the near-infrared filter 41 is completely away from the propagation path of the light passing through the telephoto imaging module 2, and no longer filters any light passing through the telephoto imaging module 2;

[0036] In this embodiment, the filter switching module 4 includes an IRCut switch, the wavelength range of the light passing through the telephoto imaging module 2 is 400-1000nm, and the wavelength range of the near-infrared light is 750-1000nm.

[0037] Therefore, when the telephoto imaging module 2 needs to acquire a target image during the day, the near infrared filter 41 is switched to position (i.e., the near infrared filter 41 is located on the propagation path of the light passing through the telephoto imaging module 2). At this time, the near infrared light in the light passing through the telephoto imaging module 2 is filtered out by the near infrared filter 41, and the visible light with a wavelength range of 400 to 750 nm can pass through the near infrared filter 41, and is further sensed by the light sensor at the rear end, and is processed by the image processing chip to generate a color visible light image;

[0038] When the telephoto imaging module 2 needs to acquire the target image at night, there is no need to locate the near-infrared filter 41 on the propagation path of the light passing through the telephoto imaging module 2. At this time, the light passing through the telephoto imaging module 2 will not be filtered out at all, and will be further sensed by the light sensor at the rear end and processed by the image processing chip to generate a black-and-white low-light night vision image.

[0039] Therefore, this embodiment can drive the near-infrared filter to operate through the filter switching module to support full-band light input of 400 to 1000nm, so as to generate visible light images and low-light night vision images in different scenes respectively, to meet the usage requirements in different scenes.

[0040] Embodiment 3:

[0041] The difference between this embodiment and embodiment 1 or 2 is that the continuous optical zoom night vision imaging device further includes:

[0042] An anti-reflection film, which is attached to the lens surface of the wide-angle imaging module 1 and / or to the lens surface of the telephoto imaging module 2, and the anti-reflection film allows light in the wavelength range of 400 to 1000 nm to pass through, and makes the light transmittance [80%, 95%], thereby improving the light transmittance of the full-band light of 400 to 1000 nm, increasing the image brightness, and supporting the imaging effect in the full-band range of 400 to 1000 nm;

[0043] And a fill light 5, which is used to provide light with a wavelength range of 800 to 900 nm to the telephoto imaging module 2 when the near-infrared filter 41 is located on the propagation path of the light passing through the telephoto imaging module 2, so as to achieve a fill light effect, so that the telephoto imaging module 2 can obtain a clearer target image when acquiring a long-distance target image.

[0044] At the same time, the viewing angle of the fill light 5 cannot be too large. If the viewing angle is too large, the illuminated area will increase, and the required power will also be greater, resulting in high energy consumption. If the viewing angle is too small, the illuminated area will be too small, and a complete target image cannot be obtained. Therefore, in this embodiment, the viewing angle of the fill light 5 can be selected according to Determine, where H is the illumination distance of the fill light 5; r is the field angle of the fill light 5; and D is the diameter of the illumination area of ​​the fill light 5. Preferably, in this embodiment, the value range of the field angle r of the fill light 5 is [5°, 10°].

[0045] Embodiment 4:

[0046] This embodiment provides an imaging control method, which is implemented based on the continuous optical zoom night vision imaging device described in any one of Embodiments 1 to 3. Specifically, the imaging control method includes the following steps:

[0047] S1, acquiring a target image through a wide-angle imaging module 1;

[0048] S2. When the wide-angle imaging module 1 acquires a target image at a field of view angle equal to the maximum field of view angle b of the telephoto imaging module 2, the control module 3 calls the telephoto imaging module 2 to acquire an image of the same target.

[0049] Furthermore, the telephoto imaging module 2 acquires an image of the same target including the following steps:

[0050] The near-infrared filter 41 is driven to move by the filter switching module 4, so that the near-infrared filter 41 is located on the propagation path of the light passing through the telephoto imaging module 2, so as to filter out the near-infrared light in the light;

[0051] And / or, when the near-infrared filter 41 is completely away from the propagation path of the light passing through the telephoto imaging module 2 and no longer filters any light passing through the telephoto imaging module 2, the fill light 5 is turned on.

[0052] To summarize, the present application can timely switch the telephoto imaging module to acquire images through the change of the field of view angle of the wide-angle imaging module, and make full use of the imaging characteristics of the two to obtain high-quality ultra-clear images. At the same time, the near-infrared filter is driven by the filter switching module to support the full-band light input of 400-1000nm, so as to generate visible light images and low-light night vision images in different scenes respectively, to meet the usage requirements in different scenes. At the same time, the light transmittance is improved by the anti-reflection film, and the telephoto imaging module is supplemented with light to increase the light brightness and increase the image quality, so as to meet the high-definition reconnaissance and identification requirements of long-distance targets in the application scenarios of drones.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A continuous optical zoom night vision imaging device, characterized in that: include: A wide-angle imaging module, a telephoto imaging module and a control module, wherein the field of view angle a of the wide-angle imaging module is greater than the maximum field of view angle b of the telephoto imaging module, and the field of view range corresponding to the field of view angle a of the wide-angle imaging module partially overlaps with the field of view range corresponding to the maximum field of view angle b of the telephoto imaging module; The control module is connected to the wide-angle imaging module and the telephoto imaging module respectively, and is used to obtain the field of view angle change information of the wide-angle imaging module in real time, and when the wide-angle imaging module obtains the target image at a field of view angle equal to the maximum field of view angle b of the telephoto imaging module, the telephoto imaging module is called to obtain the image of the target.

2. The continuous optical zoom night vision imaging device according to claim 1, characterized in that: The field of view angle a of the wide-angle imaging module ranges from [60°, 180°], the maximum field of view angle b of the telephoto imaging module ranges from [30°, 90°], and the minimum field of view angle c ranges from [8°, 45°].

3. The continuous optical zoom night vision imaging device according to claim 1, characterized in that: The telephoto imaging module includes a continuous optical zoom lens with a zoom ratio of 3-11 times and a lens focal length of 15.3mm-49.7mm.

4. The continuous optical zoom night vision imaging device according to claim 1, characterized in that: The optical axes of the wide-angle imaging module and the telephoto imaging module are parallel to each other.

5. The continuous optical zoom night vision imaging device according to claim 1, characterized in that: The continuous optical zoom night vision imaging device also includes: A filter switching module, which has a near-infrared filter, is used to drive the near-infrared filter to move so that the near-infrared filter is located on the propagation path of the light passing through the telephoto imaging module to filter out the near-infrared light in the light; or to drive the near-infrared filter located on the propagation path of the light passing through the telephoto imaging module to move so that the near-infrared filter is completely away from the propagation path of the light passing through the telephoto imaging module.

6. The continuous optical zoom night vision imaging device according to claim 5, characterized in that: The wavelength range of the light passing through the telephoto imaging module is 400 to 1000nm, and the wavelength range of the near-infrared light is 750 to 1000nm.

7. The continuous optical zoom night vision imaging device according to claim 1, characterized in that: The continuous optical zoom night vision imaging device also includes: an anti-reflection film, which is attached to the lens surface of the wide-angle imaging module and / or attached to the lens surface of the telephoto imaging module, and the anti-reflection film allows light in the wavelength range of 400 to 1000 nm to pass through, and the light transmittance is [80%, 95%].

8. The continuous optical zoom night vision imaging device according to claim 1, characterized in that: The continuous optical zoom night vision imaging device also includes: a fill light, which is used to provide light with a wavelength range of 800 to 900 nm to the telephoto imaging module, and the field of view of the fill light is based on Determine, where H is the illumination distance of the fill light; r is the field of view of the fill light; and D is the diameter of the illumination area of ​​the fill light.

9. An imaging control method, characterized in that: The steps include: Acquire the target image through the wide-angle imaging module; When the wide-angle imaging module acquires a target image at a field of view angle equal to the maximum field of view angle of the telephoto imaging module, the telephoto imaging module is called to acquire the target image.

10. The imaging control method according to claim 9, characterized in that: The telephoto imaging module acquires an image of the same target including the following steps: The near-infrared filter is driven to move by the filter switching module so that the near-infrared filter is located on the propagation path of the light passing through the telephoto imaging module to filter out the near-infrared light in the light; And / or, when the near-infrared filter is completely away from the propagation path of the light passing through the telephoto imaging module and no longer filters any light passing through the telephoto imaging module, the fill light is turned on.

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