WO2016165644A1

WO2016165644A1 - Panoramic image acquisition device

Info

Publication number: WO2016165644A1
Application number: PCT/CN2016/079378
Authority: WO
Inventors: 胡笑平
Original assignee: 博立码杰通讯(深圳)有限公司
Priority date: 2015-04-17
Filing date: 2016-04-15
Publication date: 2016-10-20
Also published as: CN106154732A

Abstract

A panoramic image acquisition device comprises a catadioptric lens group (210) and a photosensitive module (220). The catadioptric lens group has a reflecting surface (211) and at least one refractive surface (212, 313, 214) configured to converge incident light. The reflecting surface is disposed behind all of the refractive surfaces along a light incidence direction, such that incident light passes through all of the refractive surfaces, is reflected, passes through all of the refractive surfaces again, and is emitted. The photosensitive module is configured to sense convergent light that has passed through the catadioptric lens group. Since present invention employs the catadioptric lens group combining the refractive surface and the reflecting surface to collect incident light, a converging effect of the refractive surface cooperating with the reflecting surface can be enhanced exponentially. The present invention greatly improves the capacity of a photosensitive module to acquire light with the same reflecting lens area, facilitates obtaining a clear image, and increases resolution.

Description

Instruction Manual Name: Panoramic image collection device

Technical field

[0001] The present invention relates to the field of image technologies, and in particular, to a panoramic image capturing device.

BACKGROUND OF THE INVENTION

[0003] A device capable of acquiring an image of an annular area around 360 degrees is generally referred to as a panoramic image capturing device. With the development of digital imaging technology, especially the increasing number of pixels and image processing capabilities, the use of panoramic image acquisition devices is becoming more and more common.

[0004] Currently available panoramic image technologies include the following:

[0005] 1. Rotate the image around the axis by using an ordinary image capturing device, and then seamlessly stitch the images to obtain a panoramic image. This method requires a large amount of image stitching calculation, it is difficult to ensure the realism, and continuous shooting is impossible for the same position, and it is difficult to record a continuous video.

[0006] 2. A fisheye lens is mounted on the front end of the photosensitive device, and the super wide angle is used for panoramic imaging. Due to the large distortion of the fisheye lens, it is difficult to obtain high quality image restoration effects.

[0007] 3. Using a mirror to acquire a panoramic image, as shown in Fig. 1, the light from the shooting area AA is reflected by the rotationally symmetrical curved mirrors BB and CC, and then enters the photosensitive module DD for imaging. This technique has a small distortion, but requires discrete reflective elements, the mounting accuracy is not easy to control, and the amount of light actually entering the photosensitive module is small, making it difficult to obtain a clear image.

In addition, there is a catadioptric lens whose optical path is similar to that of FIG. 1, but is designed to receive parallel light to achieve telephoto, and is not used to acquire a panoramic image.

[0009] Therefore, it is still desirable to develop a panoramic image capture device that can provide better results.

SUMMARY OF THE INVENTION

[0011] According to the present invention, there is provided a panoramic image capturing device comprising a catadioptric lens group and a photosensitive module;

The catadioptric lens group includes one or two or more lens elements having a reflecting surface and at least one refractive surface for collecting incident light. The reflecting surface is disposed behind the entire refractive surface in a direction in which the light is incident, so that the incident light passes through the respective lenses. The component is then reflected and re-emitted through each lens element; the photosensitive module includes a photosensitive device for sensing the light concentrated by the catadioptric lens group. [0012] According to the panoramic image capturing device of the present invention, a combination of a combination of refraction and reflection is used to collect incident light. The light is concentrated once before being reflected, and then concentrated again after reflection, which can be doubled and enhanced. Converging effect of the matching surface of the reflecting surface; on the one hand, the device design is more compact, which helps to reduce the size; on the other hand, compared with the prior art of the first reflecting and re-concentrating, in the case of the same mirror area , greatly increasing the ability of the photosensitive module to obtain light, helping to obtain clear images and improve resolution.

[0013] Specific examples in accordance with the present invention will be described in detail below with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

1 is a schematic diagram of an optical path of one of the conventional panoramic image technologies;

2 is a schematic diagram of a panoramic image capturing device according to Embodiment 1 of the present invention;

3 is a schematic diagram of an image restoration method in Embodiment 1;

4 is a schematic diagram of a panoramic image capturing device according to Embodiment 2 of the present invention;

5 is a schematic diagram of a panoramic image capturing device according to Embodiment 3 of the present invention;

6 is a schematic diagram of a panoramic image capturing device according to Embodiment 4 of the present invention;

7 is a schematic diagram of a panoramic image capturing device according to Embodiment 5 of the present invention.

DETAILED DESCRIPTION

Embodiment 1

[0024] An embodiment of the panoramic image capture device according to the present invention may refer to FIG. 2, including a catadioptric lens group 110, and a photosensitive module 120.

[0025] In the present embodiment, the catadioptric lens group has a simple structure and is composed of a lens element 111 having a reflecting surface 112 and a refractive surface 113 for collecting incident light. The reflecting surface is disposed on the back surface of the lens element 111. For example, the reflecting surface is provided by plating a reflective film on the back surface of the lens element, and the back surface refers to the other surface of the lens element that faces the surface on which the light is incident. It is worth mentioning that in the prior art device that relies on the reflecting surface to collect the panoramic light, the ability to converge light mainly depends on the curved surface shape of the reflecting surface. In the present invention, since the reflecting surface is combined with the refractive surface, it mainly depends on being The refracting surface of the reflecting surface is condensed, so that the reflecting surface can adopt various shapes which are easier to process, such as a plane, a circumferentially symmetrical concave or convex surface, and the like.

[0026] In other embodiments, the catadioptric lens group may have a change depending on the design of the optical path and the performance requirements. The structured structure, for example, may have more than two refractive faces. In the case of having a plurality of refractive surfaces, the reflecting surface should be disposed in the direction in which the light is incident after all the refractive surfaces, so that the incident light is reflected after passing through the respective lens elements, and is again emitted after passing through the respective lens elements. In the case of having a plurality of refractive surfaces, the catadioptric lens group may be composed of two or more lens elements, and the reflecting surface is disposed on the back side of the last lens element; or, the catadioptric lens group may be composed of more than one lens element and an independent The reflective element is composed of a reflective surface provided by a separate retroreflective element. The focal length of the catadioptric lens group can be fixed or it can be manually or automatically adjusted.

[0027] The photosensitive module 120 includes a photosensitive member 121 and a base 122 for fixing, and the photosensitive member 121 is for sensing light concentrated by the transflective lens group 110. In this embodiment, the photosensitive module has a simple structure, and there is no additional lens group. Except for the supporting structure (such as a dust cover or a mounting accessory, etc.), the components for image capturing function are only photosensitive devices. In other embodiments, the photosensitive module can also have its own lens group.

[0028] In order to facilitate the fixing of the separated catadioptric lens group and the photosensitive module in accordance with a predetermined optical path, the embodiment further includes a lens support 130. In this embodiment, the material and shape of the lens support member are not limited, as long as the same function of the fixed function can be prevented from interfering with the surrounding light entering the catadioptric lens group. For example, since the catadioptric lens group and the photosensitive module have the same optical axis L1 in this embodiment, the lens support 130 as a whole may have a rotationally symmetrical shape, such as a cylindrical shape, a paraboloidal shape, a spherical shape, or an ellipsoidal shape. Etc., the catadioptric lens group is fixed at one end of the lens support member, and the photosensitive module is fixed at the other end, and the two are coaxially fixed; the lens support member can be made of a transparent material or surrounded by a plurality of elongated rod members (sparse Bird cage, if the slender rod is made of opaque material, the diameter and density of the rod are not to have a substantial impact on the imaging effect. In other embodiments, the lens support can also be omitted, and the photosensitive module and the catadioptric lens group can be integrated into one body, as shown in Embodiment 3.

[0029] In order to provide more abundant and excellent functions, the embodiment further includes the following additional elements. In other embodiments, one or more of the additional elements may be selectively included according to the needs of the application. Narrative

[0030] The mobile infrared filter 140 is fixed on the motor-driven rotating support 141 and movably disposed between the catadioptric lens group 110 and the photosensitive device 121. When you need to capture a color image, such as during the day or with other externally visible illumination sources, the mobile IR filter can be moved to photographic The optical path of the device 121 is such that the infrared light is filtered out to better obtain color. When it is necessary to take an infrared photograph, such as a night or weak external light, the mobile infrared filter is moved from the optical path of the photosensitive device 121 to improve the sensing capability of the photosensitive device to infrared light.

[0031] An image processor (not shown) for reducing a pie-shaped panoramic image captured by the photosensitive device into a cylindrical image. As shown in Fig. 3, the wafer-shaped image V 1 captured by the photosensitive device can be reduced to a continuous cylindrical image V2 by, for example, coordinate conversion and interpolation calculation.

[0032] The display 150 is configured to display an image captured by the photosensitive device, for example, displaying an original image captured by the photosensitive device or displaying an image restored by the image processor (displayable in segments). The normal line of the display screen in this embodiment is perpendicular to the optical axis of the photosensitive device. In other embodiments, the normal of the display screen may be parallel to the optical axis of the photosensitive device or may be separately provided from the image capture device according to the needs of the application scenario, and only connected by data. In order to facilitate the user to view the panoramic image, the display screen may preferably adopt a touch screen, and part or all of the cylindrical image shown in FIG. 3 may be displayed on the display screen, and the user can view the interested part by sliding or touching the finger and the pair. The aspect ratio is adjusted.

Example 2

Another embodiment of the panoramic image capture device according to the present invention can be referred to FIG. 4, including a catadioptric lens head 210, a photosensitive module 220, and a lens support 230.

[0035] The catadioptric lens group 210 includes two lens elements, and the reflecting surface 211 is disposed on the back side of the last lens element, thus having three refractive faces 212, 213, 214. The number of lens elements of the catadioptric lens group according to the present invention can be 2 to 4, which is convenient for design and manufacture without excessive complexity.

[0036] In addition to the photosensitive device 221 and the fixed base 222, the photosensitive module 220 further includes a second lens group 223 disposed before the photosensitive device, and the light is sensed by the photosensitive device after passing through the second lens group. The addition of the second lens group in the photosensitive module further enhances the concentrating power and, on the other hand, expands the freedom of optical design. In this embodiment, the second lens group has two lens elements, preferably, any one of which has an autofocus function, thereby reducing the manufacturing apparatus and mounting accuracy requirements of the entire apparatus.

[0037] It is worth mentioning that, as a preferred embodiment, the second lens group may adopt a lens group capable of independently imaging to the photosensitive device, and correspondingly, the lens support member and the folding lens group are fixedly connected, and the lens support member Removably connected to the photosensitive module. This means that the panoramic image capture device according to the present invention The device can be a dual-function device. When a retro-reflective lens group is added, a panoramic image can be acquired. When the folding lens group is removed, the photosensitive module can also be used as an ordinary image capturing device. In other words, the panoramic image capturing device can be realized at low cost by adding a folding reflection lens group to an existing camera.

[0038] Specifically, referring to FIG. 4, a mounting slot 2221 may be disposed on an external structure of the photosensitive module (for example, the base 222 or an equivalent housing and support structure, etc.), and the lens support 230 has a phase The mating connection structure is detachably fixed in the mounting slot. In this way, the high-precision mounting of the catadioptric lens group can be achieved, and the disassembly can be easily performed for function conversion.

Example 3

[0040] Another embodiment of a panoramic image capture device in accordance with the present invention can be seen in FIG. 5, including a catadioptric lens set 310 and a photosensitive module 320.

[0041] This embodiment provides a very compact structure in which the photosensitive module is directly mounted to the catadioptric lens group, so that the lens support can be omitted. Specifically, the catadioptric lens group of the embodiment is composed of three lens elements, and the top end of the lens element has a recess at the top thereof, and the photosensitive module is fixed in the recess, and the frontmost lens element is referred to in the incident direction of the light. The first lens element. The photosensitive module 320 includes, in addition to the photosensitive device 32 1 and the fixed base 322, a second lens group 323 for autofocusing. Since the top of the frontmost lens element needs to be provided with a recess for mounting the photosensitive module, the frontmost refractive surface 312 (referring to the first refractive surface in the incident direction of the light) has a composite curved shape, and the overall curved shape Rotationally symmetrical, the height of the surface of the center area is lower than the height of the surface of the surrounding area. In order to facilitate optical design and processing, there may be a cliff-like discontinuous change between the curved surface of the low-lying portion and the surrounding curved surface, as shown in FIG. 5; in other embodiments, other concave shapes may also be used, such as relatively smooth. Continuously changing shape.

[0042] The panoramic image capturing device of the present embodiment not only eliminates the lens support, so that the device size can be further reduced, and the image quality can be further improved by avoiding the interference of the lens support.

[0043] In order to facilitate the ceiling mounting, the line channel 324 can be generated by drilling holes in the lens for arranging the power supply and signal transmission lines of the photosensitive module. Of course, the use of external wiring; or wireless power supply and data transmission, thus eliminating the line channel in the lens or the external bow I line is also possible.

Embodiment 4

[0045] Another embodiment of the panoramic image capturing device according to the present invention can refer to FIG. 6 and includes a folding mirror. The head group 410, the photosensitive module 420 and the lens support 430.

The difference between the embodiment and the embodiment 2 is mainly that the optical path deflection component 460 is further disposed on the optical path between the catadioptric lens group 410 and the photosensitive module 420, so that the optical axis L2 of the catadioptric lens group and the photosensitive module are provided. The optical axis L3 is not parallel. Since the optical path is deflected, the lens support can be mounted on an additional mount 470 that is fixed relative to the photosensitive module (specifically not shown). Description of other components can be referred to in Embodiment 2.

[0047] In practical applications, there is a need to form an angle between the viewing direction (the optical axis of the objective lens) and the optical axis of the photosensitive module, that is, the optical path needs to be steered, and the structure of the embodiment can be used to satisfy this requirement. The optical path deflecting element 460 may specifically employ, for example, a planar mirror or a prism. The device of this embodiment can also be referred to as a periscope panoramic image capturing device.

Embodiment 5

Another embodiment of the panoramic image capture device in accordance with the present invention can include a catadioptric lens set 510 and a photosensitive module 520 with reference to FIG.

[0050] The present embodiment provides a separate mounting structure in which the reflective lens group has a larger size than the photosensitive module, in which case the reflective lens group may employ fewer lens elements, such as one. A large-sized reflective lens is mounted on the ceiling Fl, a small-sized photosensitive module is mounted on the floor F2, and a building support structure between the ceiling and the floor serves as a lens support (not shown). In order to provide better focusing and focusing ability, the photosensitive module in this embodiment preferably includes a second lens group 523 capable of automatically focusing in addition to the photosensitive device 521.

[0051] With the structure of the embodiment, the image capturing interval is a complete space between the catadioptric lens group and the photosensitive module, which avoids a relatively small installation and a small amount of blind spots caused by the blocking of the photosensitive module and/or the supporting structure.

The embodiments of the present invention have been described in detail with reference to the preferred embodiments of the present invention. It is understood that the above embodiments are only intended to aid the understanding of the invention and are not to be construed as limiting. Variations to the above-described embodiments may be made by those skilled in the art in light of the teachings herein. technical problem

Problem solution

Advantageous effects of the invention

Claims

Claim

[Claim 1] A panoramic image capturing device, comprising:

A catadioptric lens assembly comprising one or more lens elements having a reflective surface and at least one refractive surface for concentrating incident light, the reflective surface being disposed behind the entire refractive surface in a direction in which the light is incident, such that the incident light passes Each lens element is then reflected and re-emitted through each lens element; the photosensitive module includes a light sensing device for sensing light concentrated by the set of catadioptric lenses.

[Claim 2] The apparatus according to claim 1, further comprising a lens support for fixing the set of the catadioptric lens relative to the photosensitive module in accordance with a predetermined optical path.

[Claim 3] The apparatus according to claim 2, wherein the lens support has a rotationally symmetrical shape as a whole, and the folding reflection lens group and the photosensitive module are coaxially fixed; the lens support The pieces are made of a transparent material, or a plurality of elongated rods are used to form a bird cage.

[Claim 4] The apparatus according to claim 1, wherein a top portion of the lens element at the foremost end of the catadioptric lens group has a recess, and the photosensitive module is fixed in the recess.

[Claim 5] The device according to claim 1, further comprising an optical path deflecting element disposed on an optical path between the group of the catadioptric lens and the photosensitive module, such that the catadioptric lens group The optical axis is not parallel to the optical axis of the photosensitive module.

[Claim 6] The apparatus according to any one of claims 1 to 5, wherein the reflecting surface is provided on the back side of the last lens element or provided by a separate light reflecting element.

The device according to any one of claims 1 to 5, wherein the photosensitive module further comprises a second lens group disposed before the photosensitive device, and the light is passed through the second lens group. The photosensitive device senses.

[Claim 8] The apparatus according to claim 7, wherein the second lens group is a lens group capable of independently imaging the photosensitive device;

The lens support is fixedly coupled to the group of the catadioptric lens, and the lens support is detachably coupled to the photosensitive module.

[Claim 9] The device according to claim 8, wherein the external structure of the photosensitive module A mounting slot is provided, and the lens support is detachably fixed in the mounting slot.

[Claim 10] The apparatus according to any one of claims 1 to 5, further comprising one or more of the following elements:

a display screen for displaying an image captured by the photosensitive device, the normal line of the display screen being perpendicular or parallel to an optical axis of the photosensitive device;

An image processor, configured to restore a circular panoramic image captured by the photosensitive device into a cylindrical image;

A mobile infrared filter is movably disposed between the set of reflective lenses and the photosensitive device.