CN211880472U - Image acquisition device and camera - Google Patents
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- CN211880472U CN211880472U CN202020574628.3U CN202020574628U CN211880472U CN 211880472 U CN211880472 U CN 211880472U CN 202020574628 U CN202020574628 U CN 202020574628U CN 211880472 U CN211880472 U CN 211880472U
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Abstract
The utility model provides an image acquisition device and camera assembles the light through the camera lens, and the light that reuses image sensor to the camera lens assemble carries out photoelectric conversion in order to form the image, uses the burnt adjustment mechanism of back to carry out the burnt regulation of back to image sensor, then reuses the inclination that the inclination adjustment mechanism adjusted image sensor, has enlarged image acquisition device's clear imaging range simultaneously to carry out the field depth extension. According to the technical scheme, the problem that when the existing camera adopts a large aperture to acquire images, the depth of field is small, and clear images of a plurality of monitored objects cannot be acquired is solved.
Description
Technical Field
The utility model relates to an optical imaging technical field specifically relates to an image acquisition device and camera.
Background
Under the development background of artificial intelligence and smart cities, the camera is used as the most direct and most common information acquisition equipment, and the functional requirements on intelligent identification are higher and higher. Because all-weather monitoring and relevant identification algorithms are required, the existing imaging system usually adopts a large-aperture lens, but the defect caused by the adoption of the large-aperture lens is that the depth of field (the range of clear imaging) is small. When a person or a monitored object appears in the field of view, the image can be clearly imaged within a small distance, and the distance or the distance is blurred.
Although the existing camera can perform clear imaging by adopting an automatic focusing mode, when a plurality of monitored objects exist in a picture, the monitoring objects cannot be focused simultaneously, so that the monitoring effect of the existing camera is poor, and the cost is high.
SUMMERY OF THE UTILITY MODEL
The prior art problem of the utility model is that use big light ring to lead to imaging system's depth of field to be less among the current imaging system, can't make a plurality of clear formation of image of being monitored object.
The present invention provides an image capturing device for solving the above technical problems, wherein the lens is used for converging light; the image sensor is used for performing photoelectric conversion on the light rays converged by the lens to form an image; the back focus adjusting mechanism is connected with the image sensor and is used for adjusting the back focus of the image sensor; and the inclination adjusting mechanism is connected with the image sensor and is used for adjusting the inclination angle of the image sensor so as to expand the depth of field.
Further, the device comprises a processing device, wherein the processing device is connected with the image sensor, and the processing device is used for transmitting an image formed by the image sensor to the display device.
Furthermore, the number of the image sensors is two, and the image acquisition device further comprises a light splitting device which is used for splitting the light rays converged by the lens and transmitting the light rays to the two image sensors.
Further, the light splitting device splits the light rays converged by the lens into different spectral ranges and transmits the different spectral ranges to the two image sensors.
Further, the two image sensors are respectively connected with a processing device, and the processing device registers images formed by the two image sensors.
Further, the two image sensors are respectively connected with a back focus adjusting mechanism and a tilt adjusting mechanism.
Further, a communication device is included that transmits the image formed by the image sensor to a back-end processing system.
Further, the back-end processing system determines whether the images formed by the image sensors are clear or whether the images acquired by the two image sensors are registered.
Furthermore, the inclination adjusting mechanism adjusts the image sensor to rotate around the own symmetry axis or the symmetry axis parallel to the own symmetry axis, so that the included angle between the normal of the image sensor and the optical axis of the lens is changed.
A camera is also provided, which comprises the image acquisition device.
The utility model provides an image acquisition device includes that the camera lens assembles the light, and the light that reuses image sensor to the camera lens and assemble carries out photoelectric conversion in order to form image use back burnt adjustment mechanism to carry out back burnt adjustment to image sensor and make the image that image sensor accepted clear, then reuses the inclination that the inclination adjustment mechanism adjusted image sensor to carry out the extension of degree of depth. According to the technical scheme, the problem that when the existing camera adopts a large aperture to acquire images, the depth of field is small, and clear images of a plurality of monitored objects cannot be acquired is solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic block diagram of a first embodiment of an image capturing device according to the present invention;
fig. 2 is a schematic view of an image capturing device according to a first embodiment of the present invention.
Fig. 3 is a schematic block diagram of a second embodiment of the image capturing device of the present invention;
fig. 4 is a block diagram of the camera of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be noted that the following examples are only for illustrating the present invention, but do not limit the scope of the present invention. Similarly, the following embodiments are only some but not all embodiments of the present invention, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.
The terms "first", "second" and "third" in the present application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of indicated technical features. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise. All directional indicators (such as upper, lower, left, right, front, and rear … …) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly. The terms "comprising" and "having" and any variations thereof in the embodiments of the present application are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or may alternatively include other steps or elements inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Please refer to fig. 1, which is a block diagram of an image capturing device according to a first embodiment of the present invention.
In this embodiment, image acquisition device includes that camera lens 1 is used for assembling light, and camera lens 1 adopts lens in this embodiment, and camera lens 1 is provided with camera lens 1 protective sheath outward for at ordinary times protection camera lens 1 is not damaged. The image sensor 2 is arranged on a focusing path of the lens 1, and the image sensor 2 is used for performing photoelectric conversion on light rays converged by the lens 1 to form an image and transmitting the image to the processing device 5. The back focus adjustment mechanism 3 and the tilt adjustment mechanism 4 are connected to the image sensor 2, and the back focus adjustment mechanism 3 performs back focus adjustment on the image formed on the image sensor 2 to change the focal length of the image formed on the image sensor 2. The inclination adjusting mechanism 4 is used for adjusting the inclination angle of the image sensor 2 so as to expand the depth of field, and the inclination adjusting mechanism 4 adjusts the image sensor 2 to rotate around the symmetrical axis of the image sensor 2, so that the included angle between the normal of the image sensor 2 and the optical axis of the lens 1 is changed, and the image formed by the image sensor 2 is clear and the depth of field is large. The image finally formed by the image sensor 2 is transferred to the processing device 5, and the formed image is transferred to the display device 6 for display after being subjected to determination processing by the processing device 5.
The image acquisition means may also include communication means (not shown) for communicating the image formed by the image sensor 2 to a back-end processing system. The communication device comprises a communication circuit, after the communication device transmits the image formed by the image sensor 2 to the back-end processing system, the back-end processing system judges whether the image formed by the image sensor 2 is clear, and if the back-end processing system judges that the image formed by the image sensor 2 is not clear, the image acquisition device acquires the image for the second time. In this embodiment, the back-end processing system is disposed at the camera terminal, and the plurality of cameras correspond to the same back-end processing system, so that the cost and the maintenance are greatly reduced, and meanwhile, the images transmitted by the image sensor 2 can be rapidly processed.
When the image capturing device in the first embodiment is used to capture an image, please refer to fig. 2, which is a schematic diagram of the image capturing device according to the first embodiment of the present invention. The new image plane shown in fig. 2 is an imaging plane of the image sensor 2 in the image capturing apparatus provided in the present embodiment, and the original image plane is an imaging plane in the imaging system in the related art. The new object plane is an object plane that can be acquired in the image acquisition device provided by this embodiment, and the original object plane is an object plane in the imaging system in the prior art.
The image acquisition device provided by the embodiment satisfies the following relational expression:
||<90°；
θ ═ arctan [ (V edge-V center)/(1/2 × y') ];
the angle between the object plane and the optical axis of the lens is theta, the angle between the normal of the imaging plane and the optical axis of the lens is theta, the edge V is the image distance corresponding to the object distance of the object at the lower edge in the lens view field range, the center V is the image distance corresponding to the object distance of the center focusing object in the lens view field range, and y' is the size of the imaging plane.
As shown in fig. 2, after the imaging plane of the image sensor is tilted by the adjustment of the tilt adjustment mechanism, the best imaged object plane changes with the tilt of the imaging plane. As can be seen from the working schematic diagram of the image capturing device shown in fig. 2, the monitored object can be clearly imaged within a long distance, so that the depth of field of the image capturing device provided by this embodiment is large.
Furthermore, in order to further improve the depth of field, an included angle theta between the normal of an imaging surface in the imaging system and the optical axis of the lens meets the condition that | theta | is more than 0 and less than or equal to 10 degrees.
When the included angle theta between the normal of the imaging surface and the optical axis of the lens meets the condition that theta is more than 0 and less than or equal to 10 degrees, the object plane is parallel to the ground or forms a smaller included angle, and the depth of field of the imaging system can be increased to a greater extent at the moment.
The principle shown in the working schematic diagram of the image capturing device in fig. 2 is applicable to the second embodiment and is not repeated here.
The embodiment provides an image acquisition device, which tilts an imaging surface of an image sensor through a tilt adjusting mechanism, so that the range of the image acquisition device, which can provide a clear observed object, is enlarged, namely the depth of field of the image acquisition device is increased, therefore, a wider effective clear imaging range can be provided, the image definition consistency is good, and the dependence on automatic focusing is small; when many testees, can clear formation of image simultaneously, the recognition efficiency is high, but wide application in security protection control field, especially fields such as face identification, road monitoring.
Please refer to fig. 3, which is a block diagram of an image capturing device according to a second embodiment of the present invention. In this embodiment, the image capturing device includes a lens 7 for converging light, a light splitting device 8 is disposed on a light path of the lens 7, two image sensors 10 are disposed behind the light splitting device 8, the two image sensors 10 respectively correspond to different light emitting surfaces of the light splitting device 8, and the light splitting device 8 is configured to split the light converged by the lens 7 into different spectral ranges and transmit the light to the two image sensors 10. The two image sensors 10 receive the light of different spectra emitted by the light splitting device 8 and perform photoelectric conversion on the spectra to form an image and transmit the image to the processing device 12.
Meanwhile, the two image sensors 10 are connected with a back focus adjustment mechanism 9 and a tilt adjustment mechanism 11, respectively. The back focus adjustment mechanism 9 is used to perform back focus adjustment on images formed on the two image sensors 10, changing the focal length of the image formed on the image sensors 10, as in the first embodiment. The inclination adjusting mechanism 11 is used for adjusting an inclination angle of the image sensor 10 to expand the depth of field, and the inclination adjusting mechanism 11 adjusts the image sensor 10 to rotate around a symmetrical axis of the image sensor 10, so that an included angle between a normal of the image sensor 10 and an optical axis of light transmitted from the lens 7 is changed, and an image formed by the image sensor 10 is clear and the depth of field is large. The two image sensors 10 are connected with the same processing device 12, images formed by the image sensors 10 are finally transmitted to the processing device 12, the processing device 12 registers the images formed by the two image sensors 10, and if the images formed by the two image sensors 10 are small in error and clear after the images are registered by the processing device 12, the processing device 12 transmits the formed images to the display device 13 again for displaying.
Generally, when the light splitting device 8 includes two surfaces, namely a visible light prism and an infrared light prism, the image acquisition device includes two image sensors 10, wherein one of the image sensors 10 corresponds to the visible light prism and is used for presenting a visible light image; the other image sensor 10 corresponds to an infrared light prism for presenting an infrared light image. Wherein, the included angle between the two image sensors 10 is set at any time by the included angle between the visible light prism and the infrared light prism surface of the light splitting device, thereby ensuring that the light of the two prisms can accurately enter the image sensors. Of course, the light splitting device 8 may further include a blue prism, a green prism, and the like, and the number of prism sheets in the light splitting device 8 is not limited in this embodiment, and certainly, the number of image sensors 10 is not limited, as long as the number of image sensors 10 is the same as that of the prism sheets of the light splitting device 8, and the prism sheets correspond to the image sensors 10 one by one.
The light collected by the lens 7 is split by the light splitting device 8 and then transmitted to the image sensor 10 to form a clear image, so that stray light can be effectively removed, and the image formed at the image sensor 10 is clearer.
As in the first embodiment, the image pickup device may further include a communication device that transmits the images formed by the two image sensors 10 to a back-end processing system. After the communication device transmits the images formed by the two image sensors 10 to the back-end processing system, the back-end processing system judges whether the images formed by the two image sensors 10 can be registered, and if the images formed by the image sensors 10 are judged to be unclear and can not be registered by the back-end processing system, the image acquisition device acquires the images for the second time.
When the image capturing device of the second embodiment is used for image capturing, the standard focal length lens 7 is used for image capturing, and then the two back focus adjusting mechanisms 9 are respectively adjusted to focus the images on the two image sensors 10 clearly. The purpose of this is that the focal length of each lens 7 is different, and the lens 7 with the standard focal length is firstly used for collection and adjustment, so that the clear imaging distance of the two back focus adjusting mechanisms 9 is stable, and the object distance is also fixed. The conventional lens 7 is then replaced and focusing is performed with the lens 7. Then, the two image sensors 10 are adjusted by using the two tilt adjusting mechanisms 11, so that the tilt angles of the two image sensors 10 are adjusted by the angle θ, and the depth of field is expanded. Since the image sensor 10 is adjusted to rotate around the non-geometric center of the image sensor 10, the angle is shifted, and thus, the two back focus adjustment mechanisms 9 need to be adjusted again to make the object image on the image sensor 10. The images of the two image sensors 10 are registered via processing means 12. If the registration result is poor, either tilt adjustment mechanism 11 can be adjusted so that the images of the two image sensors 10 can be registered.
Please refer to fig. 4, which is a block diagram of the camera according to the present invention. In the present embodiment, the camera 20 includes an image capturing device, and the camera 20 can be installed at a crossing, a school entrance, a hospital, or other places needing monitoring. The image acquisition device comprises two lenses 14 for converging light rays, two image sensors 16 are respectively arranged on the light ray paths of the two lenses 14, and the two image sensors 16 receive light of images acquired by the two lenses 14, perform photoelectric conversion on the light to form images and transmit the images to the processing device 18.
Meanwhile, the two image sensors 16 are connected with a back focus adjustment mechanism 15 and a tilt adjustment mechanism 17, respectively. The back focus adjustment mechanism 15 is used to perform back focus adjustment on the images formed on the two image sensors 16, changing the focal length of the images formed on the image sensors 16, as in the first embodiment. The inclination adjusting mechanism 17 is used for adjusting an inclination angle of the image sensor 16 to expand the depth of field, and the inclination adjusting mechanism 17 adjusts the image sensor 16 to rotate around a symmetrical axis of the image sensor 16, so that an included angle between a normal of the image sensor 16 and an optical axis of the lens 14 is changed, and an image formed by the image sensor 16 is clear and has a large depth of field. The two image sensors 16 are connected with the same processing device 18, images formed by the image sensors 16 are finally transmitted to the processing device 18, the processing device 18 registers the images formed by the two image sensors 16, and if the images formed by the two image sensors 16 are small in error and clear after the images are registered by the processing device 18, the processing device 18 transmits the formed images to the display device 19 again for displaying.
In this embodiment, two lenses 14 are adopted, which is the same as the principle of the light splitting device adopted in the second embodiment, and the image acquisition scheme is also the same, which is not described herein again.
The utility model provides an image acquisition device includes that the camera lens assembles the light, and the light that reuses image sensor and assemble the camera lens carries out photoelectric conversion in order to form the image, uses the burnt adjustment mechanism of back to carry out burnt regulation after the image sensor, then reuses the inclination that the inclination adjustment mechanism adjusted image sensor, has enlarged image acquisition device's clear imaging range simultaneously to carry out the field depth extension. According to the technical scheme, the problem that when the existing camera adopts a large aperture to acquire images, the depth of field is small, and clear images of a plurality of monitored objects cannot be acquired is solved.
The above only is the partial embodiment of the utility model discloses a not therefore restriction the utility model discloses a protection scope, all utilize the utility model discloses equivalent device or equivalent flow transform that the content of description and drawing was done, or direct or indirect application in other relevant technical field, all the same reason is included in the patent protection scope of the utility model.
Claims (10)
1. An image acquisition apparatus, comprising:
the lens is used for converging light rays;
the image sensor is used for performing photoelectric conversion on the light rays converged by the lens to form an image;
the back focus adjusting mechanism is connected with the image sensor and is used for adjusting the back focus of the image sensor;
the inclination adjusting mechanism is connected with the image sensor and is used for adjusting the inclination angle of the image sensor so as to expand the depth of field.
2. The image capturing device of claim 1, further comprising a processing device coupled to the image sensor, the processing device configured to transmit an image formed by the image sensor to a display device.
3. The image capturing device as claimed in claim 2, wherein the number of the image sensors is two, and the image capturing device further includes a light splitting device for splitting the light collected by the lens and transmitting the split light to the two image sensors.
4. The image capturing device as claimed in claim 3, wherein the light splitting device splits the light collected by the lens into different spectral ranges and transmits the light to the two image sensors.
5. The image capturing device as claimed in claim 4, wherein the two image sensors are connected to the processing device, respectively, and the processing device registers the images formed by the two image sensors.
6. The image capturing device as claimed in claim 5, wherein the back focus adjusting mechanism and the tilt adjusting mechanism are connected to the two image sensors, respectively.
7. The image capture device of claim 1, further comprising a communication device that communicates an image formed by the image sensor to a back-end processing system.
8. The image acquisition device of claim 7, wherein the back-end processing system determines whether the images formed by the image sensors are clear or whether the images acquired by the two image sensors are registered.
9. The image capturing device as claimed in claim 1, wherein the tilt adjusting mechanism adjusts the image sensor to rotate around its own axis of symmetry or an axis of symmetry parallel to its own axis of symmetry, so as to change an included angle between a normal of the image sensor and the optical axis of the lens.
10. A camera, characterized in that the camera comprises an image acquisition device according to any one of the preceding claims.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112752002A (en) * | 2020-12-25 | 2021-05-04 | 浙江大华技术股份有限公司 | Adjusting device and camera with same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112752002A (en) * | 2020-12-25 | 2021-05-04 | 浙江大华技术股份有限公司 | Adjusting device and camera with same |
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