CN111273453B - Polarization multiplexing-based large-field-of-view imaging device and method - Google Patents
Polarization multiplexing-based large-field-of-view imaging device and method Download PDFInfo
- Publication number
- CN111273453B CN111273453B CN202010024391.6A CN202010024391A CN111273453B CN 111273453 B CN111273453 B CN 111273453B CN 202010024391 A CN202010024391 A CN 202010024391A CN 111273453 B CN111273453 B CN 111273453B
- Authority
- CN
- China
- Prior art keywords
- polarization
- optical
- polarized light
- linearly polarized
- field
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
Abstract
The invention discloses a polarization multiplexing-based large-field imaging device and method. The method comprises the following steps: light beams from different directions of a target are respectively incident to the N light channels to generate N linear polarized light beams; n beams of linearly polarized light are simultaneously incident to an imaging objective lens and imaged to a polarization camera to form polarization multiplexing field target information; the method comprises the steps of collecting the intensity of N beams of linearly polarized light from the polarization multiplexing field target information, and then calculating the intensity of the linearly polarized light in N optical channels by a polarization demultiplexing processing method. The invention performs target polarization imaging by combining a plurality of groups of plane reflectors and the polarization camera, can realize ultra-large field angle imaging and target information acquisition, and has the advantages of compact structure, low complexity, large imaging field angle, good imaging quality and the like.
Description
Technical Field
The invention belongs to the field of optical imaging detection, and particularly relates to a polarization multiplexing-based large-field-of-view imaging device and method.
Background
The fast realization of image information acquisition is a core target of a vision system and an optical imaging system, and determines the image perception efficiency of the vision system and the imaging efficiency and the omnidirection of the optical system, so the technology has wide application in various fields of target monitoring, positioning and tracking, infrared alarm and the like. However, the conventional camera lens is limited by the field angle, so that large-range area observation and remote target positioning and tracking cannot be performed, and therefore, the realization of ultra-large field of view and omnidirectional imaging by using an ultra-large field of view imaging system is required in the modern science and technology field.
At present, because the fisheye lens has the characteristic of wide visual field, ultra-wide-angle lenses with the visual angles of 120 degrees, 135 degrees and 180 degrees are sequentially appeared, and the fisheye lens is basically used for omnibearing imaging at present so as to simultaneously realize all-space-domain accommodation and acquisition of all-time-domain real-time information. However, the fisheye lens system is complicated in structure, generally consists of 8 to 11 lenses, the excessive number of lenses causes low transmittance and low resolution of the system, and the optical system structure designed according to the special requirements of the materials cannot be too complicated and the number of lenses of the fisheye lens is not suitable to be too large. In addition, the ultra-wide angle fish-eye lens system has the characteristics of difficulty in eliminating off-axis aberration, low image surface edge illumination and the like, so that the imaging quality of the imaging system is influenced; and the acquired background information is complex, which brings huge challenges to the target detection algorithm.
Disclosure of Invention
The invention aims to provide a large-view-field imaging device and method based on polarization multiplexing, which solve the problems that the traditional fisheye lens system is complex in structure, off-axis aberration is difficult to eliminate, the image plane edge illumination is low and the like.
The technical solution for realizing the purpose of the invention is as follows: the utility model provides a big visual field image device based on polarization multiplexing, the device is including covering N optical channel of target visual field to and receive coaxial formation of image objective and the polarization camera that sets gradually of all optical channel emergent light, the emergent light of all optical channel is the linear polarization light.
Furthermore, each of the optical channels includes a depolarizer and a linear polarizer sequentially disposed along the optical path, and meanwhile, the other optical channels include a plurality of plane mirrors disposed between the depolarizer and the linear polarizer, in addition to the optical channels coaxial with the imaging objective and the polarization camera.
Further, the transmission axis direction of the linear polarizer of each of the light channels is different.
An imaging method based on the polarization multiplexing-based large-field-of-view imaging device comprises the following steps:
and 3, acquiring the intensity of N beams of linearly polarized light from the polarization multiplexing field target information, and then resolving the intensity of the linearly polarized light in the N optical channels by using a polarization demultiplexing processing method to further obtain the image information of the N fields.
Further, in step 3, the intensity of the linearly polarized light in the N optical channels is calculated by a polarization demultiplexing method, and the formula is as follows:
in the formula I Fovi Is the intensity of linearly polarized light in the ith optical channel,
and the intensity of the linearly polarized light corresponding to the ith optical channel acquired from the polarization-multiplexed view field target information is 1,2, …, N, A is a coefficient matrix obtained by the projection of the N beams of linearly polarized light on the target surface of the polarization camera.
Compared with the prior art, the invention has the following remarkable advantages: 1) the system can realize an ultra-large field angle and enlarge an image information acquisition area by adopting a plurality of groups of plane reflectors to perform light ray conversion; compared with the currently widely researched ultra-wide-angle fisheye lens system, the traditional fisheye lens system has the advantages that the structure is complex, the number of lenses is large, the transmittance and the resolution of the system are reduced, the off-axis aberration is difficult to eliminate, and the construction structure adopting multiple groups of plane reflectors is simple, easy to realize, high in flexibility and good in imaging quality; 2) the device has low overall complexity and compact structure, and the subsequent data processing is simple and easy to implement.
The present invention is described in further detail below with reference to the attached drawing figures.
Drawings
FIG. 1 is a schematic structural diagram of a polarization multiplexing-based large-field-of-view imaging device in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In one embodiment, the invention provides a polarization multiplexing-based large-field imaging device, which comprises N optical channels covering a target field, and an imaging objective lens 9 and a polarization camera 10 which are coaxially and sequentially arranged and used for receiving emergent light of all the optical channels, wherein the emergent light of all the optical channels is linearly polarized light.
Further, in one embodiment, each of the optical channels includes an depolarizer and a linearly polarizing plate sequentially disposed along the optical path, and at the same time, in addition to the optical channels coaxial with the imaging objective 9 and the polarization camera 10, the other optical channels further include a plurality of plane mirrors disposed between the depolarizer and the linearly polarizing plate.
Further, in one embodiment, the transmission axis direction of the linear polarizer of each of the light channels is different.
Further, in one embodiment, with reference to fig. 1, N is 3, the three optical channels are respectively referred to as a first optical channel, a second optical channel and a third optical channel, and incident light from different directions of the target field of view is incident from the three optical channels respectively; the first optical channel comprises a first depolarizer 4 and a first linear polarizer 5 which are coaxially arranged along a first optical axis in sequence, and the first optical axis is coaxial with an imaging objective lens 9 and a polarization camera 10; the second optical channel comprises a second depolarizer 1, a second plane mirror 2 and a second linear polarizer 3 which are sequentially arranged along a second optical axis; the third channel comprises a third depolarizer 6, a third plane mirror 7 and a third line polarizer 8 which are sequentially arranged along a third optical axis.
Further, in one embodiment, the second optical axis and the third optical axis are symmetric with respect to the first optical axis.
Further, in one embodiment, the second depolarizer 1 and the second linear polarizer 3 are coaxial with the second plane mirror 2, respectively, and the second depolarizer 1 and the second linear polarizer 3 are not coaxial; the third depolarizer 6 and the third polarizing plate 8 are coaxial with the third plane mirror 7, respectively, and the third depolarizer 6 and the third polarizing plate 8 are not coaxial.
Further, in one embodiment, the transmission axis direction of the second linear polarizer 3 is 0 °, the transmission axis direction of the first linear polarizer 5 is 45 °, and the transmission axis direction of the third linear polarizer 8 is 90 °.
Further, in one embodiment, the outgoing light of the three optical channels is parallel, and the polarization camera 10 is located on the imaging surface of the imaging objective lens 9.
The imaging method based on the polarization multiplexing-based large-field-of-view imaging device comprises the following steps of:
and 3, acquiring the intensity of N beams of linearly polarized light from the polarization multiplexing field target information, and then resolving the intensity of the linearly polarized light in the N optical channels by using a polarization demultiplexing processing method to further obtain the image information of the N fields.
Further, in one embodiment, in step 3, the intensity of the linearly polarized light in the N optical channels is calculated by a polarization demultiplexing method, and the formula used is as follows:
in the formula I Fovi Is the intensity of linearly polarized light in the ith optical channel,
for the intensity of the linearly polarized light corresponding to the ith optical channel collected from the polarization-multiplexed view field target information, i is 1,2, …, N, a is a coefficient matrix obtained by the projection of N beams of linearly polarized light on the target surface of the polarization camera.
As a specific example, assuming that N is 3 in step 1, the generated three linearly polarized light beams are respectively 0 ° linearly polarized light, 45 ° linearly polarized light, and 90 ° linearly polarized light, and the intensities of the three linearly polarized light beams collected from the polarization-multiplexed field target information are respectively I 0 、I π/4 、I π/2 ；
Therefore, the calculation formula of the polarization demultiplexing processing method is as follows:
I 0 ＝I Fov1 cos(0)+I Fov2 cos(π/4)+I Fov3 cos(π/2)
I π/4 ＝I Fov1 cos(π/4)+I Fov2 cos(0)+I Fov3 cos(π/4)
I π/2 ＝I Fov1 cos(π/2)+I Fov2 cos(π/4)+I Fov3 cos(0)
the intensity of linearly polarized light in the three optical channels is obtained by the formula:
in the formula I Fov1 、I Fov2 、I Fov3 The intensities of the 0-degree linearly polarized light, the 45-degree linearly polarized light and the 90-degree linearly polarized light in the three light channels are respectively.
In summary, the polarization multiplexing-based large-field-of-view imaging device provided by the invention can achieve the purpose of expanding the imaging field angle of the system only by adopting a plurality of groups of plane mirrors, and can form polarization multiplexing field-of-view information through a polarization camera, and can simultaneously measure the intensity information of incident light of a plurality of optical channels at a plurality of polarization angles, thereby obtaining image information of a plurality of fields of view through polarization information demultiplexing processing. The whole device is simple in structure and easy to realize, can effectively solve the problems of complex structure, low system transmittance and resolution and the like of the traditional fisheye lens system, and has the advantages of compact structure, low complexity, large imaging field angle, good imaging quality and the like.
Claims (4)
1. A large-view-field imaging device based on polarization multiplexing is characterized by comprising N optical channels covering a target view field, an imaging objective lens (9) and a polarization camera (10) which are coaxially and sequentially arranged and used for receiving emergent light of all the optical channels, wherein the emergent light of all the optical channels is linearly polarized light;
each optical channel comprises a depolarizer and a linear polarizer which are sequentially arranged along an optical path, and meanwhile, the other optical channels comprise a plurality of plane reflectors arranged between the depolarizer and the linear polarizer besides the optical channels coaxial with the imaging objective (9) and the polarization camera (10);
the three optical channels are respectively marked as a first optical channel, a second optical channel and a third optical channel, and incident light from different directions of the target field of view is incident from the three optical channels; the first optical channel comprises a first depolarizer (4) and a first linear polarizer (5) which are coaxially arranged along a first optical axis in sequence, and the first optical axis is coaxial with the imaging objective lens (9) and the polarization camera (10); the second optical channel comprises a second depolarizer (1), a second plane mirror (2) and a second linear polarizer (3) which are sequentially arranged along a second optical axis; the third channel comprises a third depolarizer (6), a third plane mirror (7) and a third line polarizer (8) which are sequentially arranged along a third optical axis;
the light transmission axis directions of the linear polaroids of all the light channels are different;
the second and third optical axes are symmetric about the first optical axis;
the second depolarizer (1) and the second linear polarizer (3) are respectively coaxial with the second plane mirror (2), and the second depolarizer (1) and the second linear polarizer (3) are not coaxial; the third depolarizer (6) and the third polarizing film (8) are respectively coaxial with the third plane mirror (7), and the third depolarizer (6) and the third polarizing film (8) are not coaxial;
the light transmission axis direction of the second linear polarizer (3) is 0 degree, the light transmission axis direction of the first linear polarizer (5) is 45 degrees, and the light transmission axis direction of the third linear polarizer (8) is 90 degrees.
2. The polarization multiplexing-based large-field imaging device according to claim 1, wherein the outgoing light of the three optical channels is parallel, and the polarization camera (10) is located on the imaging surface of the imaging objective (9).
3. The imaging method based on the polarization multiplexing-based large-field imaging device of any one of claims 1 to 2, characterized in that the method comprises the following steps:
step 1, light beams from different directions of a target are respectively incident to N optical channels to generate N linear polarized light beams;
step 2, N beams of linearly polarized light are simultaneously incident to an imaging objective lens and imaged to a polarization camera to form polarization multiplexing view field target information;
and 3, acquiring the intensity of N beams of linearly polarized light from the polarization multiplexing field target information, and then resolving the intensity of the linearly polarized light in the N optical channels by using a polarization demultiplexing processing method to further obtain the image information of the N fields.
4. The polarization multiplexing-based large-field imaging method according to claim 3, wherein the intensity of the linearly polarized light in the N optical channels is calculated by the polarization demultiplexing processing method in step 3, and the formula is as follows:
in the formula I Fovi Is the intensity of linearly polarized light in the ith optical channel,
for the intensity of the linearly polarized light corresponding to the ith optical channel collected from the polarization-multiplexed view field target information, i is 1,2, …, N, a is a coefficient matrix obtained by the projection of N beams of linearly polarized light on the target surface of the polarization camera.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010024391.6A CN111273453B (en) | 2020-01-10 | 2020-01-10 | Polarization multiplexing-based large-field-of-view imaging device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010024391.6A CN111273453B (en) | 2020-01-10 | 2020-01-10 | Polarization multiplexing-based large-field-of-view imaging device and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111273453A CN111273453A (en) | 2020-06-12 |
| CN111273453B true CN111273453B (en) | 2022-09-13 |
Family
ID=71003001
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010024391.6A Active CN111273453B (en) | 2020-01-10 | 2020-01-10 | Polarization multiplexing-based large-field-of-view imaging device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111273453B (en) |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6693749B2 (en) * | 2001-01-31 | 2004-02-17 | Raytheon Company | Low-observability, wide-field-of-view, situation awareness viewing device |
| KR20100010137A (en) * | 2008-07-22 | 2010-02-01 | 삼성전기주식회사 | Projection display apparatus |
| CN104049465B (en) * | 2013-03-11 | 2016-06-01 | 上海微电子装备有限公司 | A kind of polarization splicing lighting system |
| WO2015040618A1 (en) * | 2013-09-17 | 2015-03-26 | Ramot At Tel-Aviv University Ltd. | A system and a method for quantitative sample imaging using off-axis interferometry with extended field of view or faster frame rate |
| US10151634B2 (en) * | 2014-11-16 | 2018-12-11 | Ibrahim Abdulhalim | Multi-spectral polarimetric variable optical device and imager |
| CN105049690B (en) * | 2015-07-06 | 2017-06-09 | 中国科学院遥感与数字地球研究所 | Portable polarization digital camera and its imaging method |
| CN108548603A (en) * | 2018-04-12 | 2018-09-18 | 中国科学院光电技术研究所 | A kind of non co axial four-way polarization imaging method and system |
| CN109459870B (en) * | 2018-07-04 | 2020-04-24 | 北京理工大学 | Multi-channel vector holographic polarization multiplexing method based on birefringent medium metasurface |
| CN109188695B (en) * | 2018-09-29 | 2021-11-30 | 北京蚁视科技有限公司 | Thin type large-field-angle near-to-eye display device |
| CN110081978A (en) * | 2019-04-29 | 2019-08-02 | 南京理工大学 | A kind of multispectral polarization imaging device of transient state and its imaging method |
| CN110618535B (en) * | 2019-08-21 | 2020-11-27 | 深圳珑璟光电技术有限公司 | Polarized multi-channel super-structure surface optical element and method for reconstructing full-color holographic image |
-
2020
- 2020-01-10 CN CN202010024391.6A patent/CN111273453B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN111273453A (en) | 2020-06-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102944937B (en) | Sub-aperture polarization imaging system | |
| JP3523783B2 (en) | Omnidirectional viewing angle sensor | |
| EP3608717B1 (en) | Wide-field of view (fov) imaging devices with active foveation capability | |
| CN109343230B (en) | Simultaneous full-polarization imaging device and method | |
| CN203799103U (en) | Full-spectrum multichannel imaging system | |
| CN104792417A (en) | Portable compact complete-polarization high-spectral imaging unit | |
| CN107589551B (en) | A kind of multiple aperture polarization imaging device and system | |
| CN102866480B (en) | Large view field optical imaging system based on computing imaging technology | |
| CN102508361A (en) | Spatial large view field, superwide spectral band and multispectral imaging optical system | |
| CN111464722A (en) | Large-angle light field imaging device and method based on curved compound eye array | |
| CN103698900A (en) | Optical imaging method and system for large-scale high-resolution remote sensing camera | |
| CN113701885B (en) | Off-axis three-reflector full-spectrum polarized spectrum imaging detection device | |
| CN104535188A (en) | Static full-polarization imaging detection system and method for spatial frequency modulation | |
| CN102903413A (en) | Four-channel KB microimaging system working under small-size backlight | |
| CN110376725B (en) | Fisheye lens system | |
| CN104792415A (en) | Complete-polarization high-spectral imaging unit | |
| CN104792416A (en) | Push-broom complete-polarization high-spectral integrated imaging unit | |
| CN111273453B (en) | Polarization multiplexing-based large-field-of-view imaging device and method | |
| CN112305739B (en) | Infrared dual-band imaging optical system combining common optical path wide and narrow fields of view | |
| CN110673313B (en) | Zoom fisheye lens system and design method | |
| CN103197403B (en) | Aperture-divided optical lens for polarization imager | |
| CN206378636U (en) | The common light path overall view ring belt optical imaging device of active polarization targets improvement | |
| CN210270354U (en) | Wide-spectrum large-relative-aperture medium-long wave infrared imaging optical system | |
| Swain et al. | Curved CCD detector devices and arrays for multispectral astrophysical applications and terrestrial stereo panoramic cameras | |
| CN110018537B (en) | High-efficiency super-surface device for realizing large-field-of-view imaging based on medium continuous structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |