CN115277994B - Low-light-level vehicle-mounted cradle head camera capable of achieving high real-time performance based on FPGA - Google Patents
Low-light-level vehicle-mounted cradle head camera capable of achieving high real-time performance based on FPGA Download PDFInfo
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- CN115277994B CN115277994B CN202210451342.XA CN202210451342A CN115277994B CN 115277994 B CN115277994 B CN 115277994B CN 202210451342 A CN202210451342 A CN 202210451342A CN 115277994 B CN115277994 B CN 115277994B
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Abstract
The invention discloses a low-light vehicle-mounted cradle head camera based on an FPGA, which is characterized in that: the camera module comprises an outer shell and a lens module, wherein the lens module comprises a main lens barrel and a CCD module, and the CCD module is arranged at the tail end of the main lens barrel; the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are sequentially arranged in the main lens barrel along the light ray incidence direction, and the outer diameters of the lenses are sequentially decreased; light is sequentially incident from the outer surface to the inner surface of each lens. The lens designed by the invention is matched with the low-light image sensor, so that the video keeps high resolution and high frame rate, meanwhile, no smear is generated, and the noise is extremely low. In low light conditions, fast moving objects can be seen completely.
Description
Technical Field
The invention belongs to the technical field of cameras, and particularly relates to a low-light-level vehicle-mounted cradle head camera based on an FPGA (field programmable gate array) for realizing high real-time performance.
Background
The existing starlight level (or black light level) vehicle-mounted product can really see the object in very weak light (generally 0.001 Lux). But this is at the expense of frame rate by increasing the amount of light input by extending the exposure time. However, when the object is being moved, particularly when the object is mounted on a vehicle, there is a serious smear, and the object at high speed cannot be seen clearly.
Disclosure of Invention
The invention aims to provide a low-light vehicle-mounted cradle head camera based on an FPGA to realize high real-time performance, and aims to solve the problems in the background technology. In order to achieve the purpose, the invention adopts the following technical scheme:
the low-light vehicle-mounted cradle head camera based on the FPGA realizes high real-time performance, comprises a base and a camera module arranged on the base, wherein the camera module comprises an outer shell and a lens module, the lens module comprises a main lens barrel and a CCD module, and the CCD module is arranged at the tail end of the main lens barrel; the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are sequentially arranged in the main lens barrel along the light ray incidence direction, and the outer diameters of the lenses are sequentially decreased; light rays are sequentially emitted from the outer surface to the inner surface of each lens;
the outer surface of the first lens is an arc convex surface, the curvature radius of the arc convex surface is 46.6mm, the inner surface of the first lens is an arc concave surface, and the curvature radius of the arc concave surface is 188.1mm; the outer surface of the second lens is an arc convex surface, the curvature radius of the arc convex surface is 43.2mm, the inner surface of the second lens is an arc concave surface, and the curvature radius of the arc concave surface is 109.8mm; the outer surface of the third lens is an arc concave surface, the curvature radius of the arc concave surface is-180 mm, the inner surface of the third lens is an arc concave surface, and the curvature radius of the arc concave surface is 19.6mm; the outer surface of the fourth lens is an arc convex surface, the curvature radius of the arc convex surface is 21.9mm, the inner surface of the fourth lens is an arc concave surface, and the curvature radius of the arc concave surface is 40mm; the outer surface of the fifth lens is an arc convex surface, the curvature radius of the arc convex surface is 186.2mm, the inner surface of the fifth lens is an arc convex surface, and the curvature radius of the arc convex surface is-60.5 mm; the sixth lens is an aspheric surface; the outer surface of the seventh lens is an arc concave surface, the curvature radius of the arc concave surface is-162.3 mm, the inner surface of the seventh lens is an arc concave surface, and the curvature radius of the arc concave surface is 20.1mm; the eighth lens is an aspheric surface;
the air interval between the first lens and the second lens is 0.61mm, the air interval between the second lens and the third lens is 8.051mm, the air interval between the third lens and the fourth lens is 0.91mm, the air interval between the fourth lens and the fifth lens is 28.53mm, the air interval between the fifth lens and the sixth lens is 0.72mm, the air interval between the sixth lens and the seventh lens is 0.71mm, and the air interval between the seventh lens and the eighth lens is 0mm;
the center thickness of the first lens is 6.51mm, the center thickness of the second lens is 7.3mm, the center thickness of the third lens is 1.52mm, the center thickness of the fourth lens is 5.32mm, the center thickness of the fifth lens is 4..21mm, the center thickness of the sixth lens is 6.4mm, the center thickness of the seventh lens is 3.23mm, and the center thickness of the eighth lens is 6.1mm;
the refractive index of the first lens is 1.5312454, the refractive index of the second lens is 1.41235, the refractive index of the third lens is 1.6021301, the refractive index of the fourth lens is 1.5301241, the refractive index of the fifth lens is 1.6238964, the refractive index of the sixth lens is 1.6023696, the refractive index of the seventh lens is 1.16323532, and the refractive index of the eighth lens is 1.6366232.
Preferably, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the seventh lens are all made of glass, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the seventh lens are glass spheres, and the sixth lens and the eighth lens are glass aspheres. .
Preferably, the outer diameter of the first lens is 45mm, the outer diameter of the second lens is 43mm, the outer diameter of the third lens is 35mm, the outer diameter of the fourth lens is 30mm, the outer diameter of the fifth lens is 29mm, the outer diameter of the sixth lens is 27mm, the outer diameter of the seventh lens is 27mm, and the outer diameter of the eighth lens is 23mm. .
The invention has the beneficial effects that: the camera realizes a pure hardware algorithm on an FPGA through a carried low-light image sensor and an advanced noise reduction algorithm, and converts the pure hardware algorithm into an AHD high-definition 1080P@30fps output through a flexible interface. The video can keep high resolution and high frame rate under the cooperation of the lens, meanwhile, no smear is generated, and the noise is extremely low. In low light conditions, fast moving objects can be seen completely.
Drawings
FIG. 1 is a schematic overall view of an embodiment of the present invention;
fig. 2 is a schematic view of a rear structure of a main lens barrel according to an embodiment of the present invention;
FIG. 3 is a schematic view of lens parameters according to an embodiment of the present invention;
fig. 4 is a schematic view of a lens MTF parameter according to an embodiment of the present invention;
fig. 5 is a schematic view of a lens Relitave illumination according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of Spot diagram parameters provided by an embodiment of the present invention;
fig. 7 is a Longitudinal Color test schematic of an embodiment of the invention.
FIG. 8 is a schematic diagram of a Lateral color test according to an embodiment of the present invention;
fig. 9 is a schematic view of a lens main angle optical diagram according to an embodiment of the present invention.
Wherein, each reference sign in the figure:
1. a base; 2. an outer housing; 3. a main barrel; 4. and a CCD module.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. The drawings illustrate preferred embodiments of the invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiments, and the terms "upper," "lower," "left," "right," "front," "back," and the like are used herein with reference to the positional relationship of the drawings.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The technical scheme of the patent is further described in detail below with reference to the specific embodiments.
As shown in fig. 1 to 9, the embodiment of the invention provides a low-light level vehicle-mounted cradle head camera based on an FPGA to realize high real-time performance, which is characterized in that: the camera module comprises a shell 2 and a lens module, wherein the lens module comprises a main lens barrel 3 and a CCD module 4, and the CCD module 4 is arranged at the tail end of the main lens barrel; the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are sequentially arranged in the main lens barrel 3 along the light ray incidence direction, and the outer diameters of the lenses are sequentially decreased; light rays are sequentially emitted from the outer surface to the inner surface of each lens;
the outer surface of the first lens is an arc convex surface, the curvature radius of the arc convex surface is 46.6mm, the inner surface of the first lens is an arc concave surface, and the curvature radius of the arc concave surface is 188.1mm; the outer surface of the second lens is an arc convex surface, the curvature radius of the arc convex surface is 43.2mm, the inner surface of the second lens is an arc concave surface, and the curvature radius of the arc concave surface is 109.8mm; the outer surface of the third lens is an arc concave surface, the curvature radius of the arc concave surface is-180 mm, the inner surface of the third lens is an arc concave surface, and the curvature radius of the arc concave surface is 19.6mm; the outer surface of the fourth lens is an arc convex surface, the curvature radius of the arc convex surface is 21.9mm, the inner surface of the fourth lens is an arc concave surface, and the curvature radius of the arc concave surface is 40mm; the outer surface of the fifth lens is an arc convex surface, the curvature radius of the arc convex surface is 186.2mm, the inner surface of the fifth lens is an arc convex surface, and the curvature radius of the arc convex surface is-60.5 mm; the sixth lens is an aspheric surface; the outer surface of the seventh lens is an arc concave surface, the curvature radius of the arc concave surface is-162.3 mm, the inner surface of the seventh lens is an arc concave surface, and the curvature radius of the arc concave surface is 20.1mm; the eighth lens is an aspheric surface;
the air interval between the first lens and the second lens is 0.61mm, the air interval between the second lens and the third lens is 8.051mm, the air interval between the third lens and the fourth lens is 0.91mm, the air interval between the fourth lens and the fifth lens is 28.53mm, the air interval between the fifth lens and the sixth lens is 0.72mm, the air interval between the sixth lens and the seventh lens is 0.71mm, and the air interval between the seventh lens and the eighth lens is 0mm;
the center thickness of the first lens is 6.51mm, the center thickness of the second lens is 7.3mm, the center thickness of the third lens is 1.52mm, the center thickness of the fourth lens is 5.32mm, the center thickness of the fifth lens is 4..21mm, the center thickness of the sixth lens is 6.4mm, the center thickness of the seventh lens is 3.23mm, and the center thickness of the eighth lens is 6.1mm;
the refractive index of the first lens is 1.5312454, the refractive index of the second lens is 1.41235, the refractive index of the third lens is 1.6021301, the refractive index of the fourth lens is 1.5301241, the refractive index of the fifth lens is 1.6238964, the refractive index of the sixth lens is 1.6023696, the refractive index of the seventh lens is 1.16323532, and the refractive index of the eighth lens is 1.6366232.
The outer diameter of the first lens is 45mm, the outer diameter of the second lens is 43mm, the outer diameter of the third lens is 35mm, the outer diameter of the fourth lens is 30mm, the outer diameter of the fifth lens is 29mm, the outer diameter of the sixth lens is 27mm, the outer diameter of the seventh lens is 27mm, and the outer diameter of the eighth lens is 23mm.
The first lens, the second lens, the third lens, the fourth lens, the fifth lens and the seventh lens are all made of glass, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the seventh lens are glass spherical surfaces, and the sixth lens and the eighth lens are glass aspheric surfaces.
The camera is composed of eight built-in optical lenses, and the target surface of a CCD module chip of the camera is 1/1.2 // The aperture F/NO=1.2, the focal length is 60mm, the optical back focal length is 9.3mm, and the total optical length can reach 97mm.The data of multiple tests of the camera lens can obviously see that the angle of the principal ray of the camera lens is in linear change, the maximum angle is 12 degrees, the relative illumination is more than 83%, the optical distortion is less than 0.5%, the MTF performance analysis can show that the image acquisition resolution of the camera lens can reach 1080P, and the high-definition resolution image can be provided. The working wavelength of the invention is 440-900nm, and infrared confocal can be realized in the infrared light band, and high-definition camera shooting under low-light illumination can be realized.
In specific application, the camera realizes a pure hardware algorithm on an FPGA through a carried low-light image sensor and an advanced noise reduction algorithm, and then converts the pure hardware algorithm into AHD high-definition 1080P@30fps output through a flexible interface. The video can keep high resolution and high frame rate under the cooperation of the lens, meanwhile, no smear is generated, and the noise is extremely low. In low light conditions, fast moving objects can be seen completely.
The above embodiments are only for illustrating the present invention, not for limiting the present invention, and various changes and modifications may be made by one of ordinary skill in the relevant art without departing from the spirit and scope of the present invention, and therefore, all equivalent technical solutions are also within the scope of the present invention, and the scope of the present invention is defined by the claims.
Claims (1)
1. The utility model provides a on-vehicle cloud platform camera of shimmer based on FPGA realizes high real-time which characterized in that: the camera module comprises an outer shell and a lens module, wherein the lens module comprises a main lens barrel and a CCD module, and the CCD module is arranged at the tail end of the main lens barrel; the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are sequentially arranged in the main lens barrel along the light ray incidence direction, and the outer diameters of the lenses are sequentially decreased; light rays are sequentially emitted from the outer surface to the inner surface of each lens;
the outer surface of the first lens is an arc convex surface, the curvature radius of the arc convex surface is 46.6mm, the inner surface of the first lens is an arc concave surface, and the curvature radius of the arc concave surface is 188.1mm; the outer surface of the second lens is an arc convex surface, the curvature radius of the arc convex surface is 43.2mm, the inner surface of the second lens is an arc concave surface, and the curvature radius of the arc concave surface is 109.8mm; the outer surface of the third lens is an arc concave surface, the curvature radius of the arc concave surface is-180 mm, the inner surface of the third lens is an arc concave surface, and the curvature radius of the arc concave surface is 19.6mm; the outer surface of the fourth lens is an arc convex surface, the curvature radius of the arc convex surface is 21.9mm, the inner surface of the fourth lens is an arc concave surface, and the curvature radius of the arc concave surface is 40mm; the outer surface of the fifth lens is an arc convex surface, the curvature radius of the arc convex surface is 186.2mm, the inner surface of the fifth lens is an arc convex surface, and the curvature radius of the arc convex surface is-60.5 mm; the sixth lens is an aspheric surface; the outer surface of the seventh lens is an arc concave surface, the curvature radius of the arc concave surface is-162.3 mm, the inner surface of the seventh lens is an arc concave surface, and the curvature radius of the arc concave surface is 20.1mm; the eighth lens is an aspheric surface;
the air interval between the first lens and the second lens is 0.61mm, the air interval between the second lens and the third lens is 8.051mm, the air interval between the third lens and the fourth lens is 0.91mm, the air interval between the fourth lens and the fifth lens is 28.53mm, the air interval between the fifth lens and the sixth lens is 0.72mm, the air interval between the sixth lens and the seventh lens is 0.71mm, and the air interval between the seventh lens and the eighth lens is 0mm;
the center thickness of the first lens is 6.51mm, the center thickness of the second lens is 7.3mm, the center thickness of the third lens is 1.52mm, the center thickness of the fourth lens is 5.32mm, the center thickness of the fifth lens is 4..21mm, the center thickness of the sixth lens is 6.4mm, the center thickness of the seventh lens is 3.23mm, and the center thickness of the eighth lens is 6.1mm;
the refractive index of the first lens is 1.5312454, the refractive index of the second lens is 1.41235, the refractive index of the third lens is 1.6021301, the refractive index of the fourth lens is 1.5301241, the refractive index of the fifth lens is 1.6238964, the refractive index of the sixth lens is 1.6023696, the refractive index of the seventh lens is 1.16323532, and the refractive index of the eighth lens is 1.6366232;
the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the seventh lens are all made of glass, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the seventh lens are glass spherical surfaces, and the sixth lens and the eighth lens are glass aspheric surfaces;
the outer diameter of the first lens is 45mm, the outer diameter of the second lens is 43mm, the outer diameter of the third lens is 35mm, the outer diameter of the fourth lens is 30mm, the outer diameter of the fifth lens is 29mm, the outer diameter of the sixth lens is 27mm, the outer diameter of the seventh lens is 27mm, and the outer diameter of the eighth lens is 23mm.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106094170A (en) * | 2015-04-30 | 2016-11-09 | 富士胶片株式会社 | Imaging lens system and camera head |
| WO2018025607A1 (en) * | 2016-08-02 | 2018-02-08 | 日立オートモティブシステムズ株式会社 | On-board camera device, on-board camera adjustment device, and on-board camera adjustment system |
| WO2020107759A1 (en) * | 2018-11-28 | 2020-06-04 | 宁波舜宇车载光学技术有限公司 | Optical lens and imaging device |
| CN111308664A (en) * | 2020-04-01 | 2020-06-19 | 深圳市中江天华科技有限公司 | Optical design of high-transmittance large-aperture low-light-level imaging lens |
| CN111308665A (en) * | 2020-04-01 | 2020-06-19 | 深圳市中江天华科技有限公司 | Optical design of large-aperture super-long-focus low-light-level imaging lens |
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- 2022-04-26 CN CN202210451342.XA patent/CN115277994B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106094170A (en) * | 2015-04-30 | 2016-11-09 | 富士胶片株式会社 | Imaging lens system and camera head |
| WO2018025607A1 (en) * | 2016-08-02 | 2018-02-08 | 日立オートモティブシステムズ株式会社 | On-board camera device, on-board camera adjustment device, and on-board camera adjustment system |
| WO2020107759A1 (en) * | 2018-11-28 | 2020-06-04 | 宁波舜宇车载光学技术有限公司 | Optical lens and imaging device |
| CN111308664A (en) * | 2020-04-01 | 2020-06-19 | 深圳市中江天华科技有限公司 | Optical design of high-transmittance large-aperture low-light-level imaging lens |
| CN111308665A (en) * | 2020-04-01 | 2020-06-19 | 深圳市中江天华科技有限公司 | Optical design of large-aperture super-long-focus low-light-level imaging lens |
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