CN220775934U - Lens dark angle testing device based on active light source - Google Patents
Lens dark angle testing device based on active light source Download PDFInfo
- Publication number
- CN220775934U CN220775934U CN202322526557.6U CN202322526557U CN220775934U CN 220775934 U CN220775934 U CN 220775934U CN 202322526557 U CN202322526557 U CN 202322526557U CN 220775934 U CN220775934 U CN 220775934U
- Authority
- CN
- China
- Prior art keywords
- light source
- lens
- camera
- dark angle
- light
- 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
- 238000012360 testing method Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 abstract description 14
- 230000000694 effects Effects 0.000 abstract description 2
- 230000003287 optical effect Effects 0.000 abstract description 2
- 238000003702 image correction Methods 0.000 abstract 1
- 238000003384 imaging method Methods 0.000 description 4
- 230000010354 integration Effects 0.000 description 3
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012634 optical imaging Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
Abstract
The utility model discloses a lens dark angle testing device based on an active light source, which comprises a cavity box body; a light source module opposite to the other end is arranged on the side wall of the end in the box body, and a TIR lens, a light homogenizing sheet and a shading plate with a mirror hole are sequentially arranged in the box body along the light direction; the other end side wall in the box body is provided with a transparent mirror hole which is used for placing a lens of a camera to be tested. The light source image correction device takes a box body as a main body, is internally provided with optical elements such as a TIR lens, a light homogenizing sheet, a light shielding plate and the like, so as to simulate uniform parallel rays of an indoor active light source, and then a camera acquires a light source image for correcting a dark angle. The camera dark angle testing device is simple in structure, convenient to use and good in light source effect, is applied to the work of calibrating camera dark angle testing and correcting, simplifies the process of dark angle testing, reduces the cost of lens dark angle testing, improves the efficiency of lens dark angle testing, and has strong practicability and wide applicability.
Description
Technical Field
The utility model relates to a lens dark angle testing device, in particular to a lens dark angle testing device based on an indoor active light source, and belongs to the technical field of optical imaging.
Background
A scene with uniform brightness is shot by a camera, and sector-shaped darkness areas extending outwards exist at four corners of the picture, namely the darkness angles. The occurrence of the dark angle is mainly due to the edge light-loss phenomenon which is unavoidable for every lens, and therefore the lens must be subjected to the dark angle test and corrected.
The vignetting correction method can be divided into three types according to different properties, wherein the first type is to consider adjusting a photoelectric conversion sensor arranged in a camera, the second type is to adjust shadow compensation parameters used in imaging of the camera, and the third type is to directly process an image imaged by the camera. The first type of method has higher technical requirements, the third type of method has higher implementation cost, and the second type of method is generally adopted.
In order to adjust the shadow compensation parameters of the camera, an external lamp box is mostly used, the camera is used for collecting images of the uniform light source by utilizing the uniform light source emitted by the external lamp box, and the shadow compensation parameters of the camera are adjusted. The implementation method relies on an external light source to a great extent, has scene limitation during implementation, and has low test efficiency.
Therefore, it is necessary to provide a lens dark angle testing device based on an indoor active light source.
Disclosure of Invention
In order to solve the defects in the prior art, the utility model aims to provide a lens dark angle testing device based on an active light source.
In order to achieve the above object, the present utility model adopts the following technical scheme:
a lens dark angle testing device based on an active light source comprises a cavity box body;
a light source module opposite to the other end is arranged on the side wall of the end in the box body,
a TIR lens, a light homogenizing sheet and a shading plate with a mirror hole are sequentially arranged in the box body along the light direction;
the lens hole is used for placing a lens of a camera to be tested.
The light source module comprises a plurality of LED lamps and a power supply for supplying power to the LED lamps.
The center lines of the TIR lens, the light homogenizing sheet and the mirror holes are consistent.
The light shielding plate is arranged at the other side end of the box body.
Further, the light shielding plate is adsorbed to the other end of the box body through magnetic attraction.
The camera also comprises a camera seat fixedly arranged outside the box body.
Furthermore, the camera seat is adsorbed outside the box body through magnetic attraction.
The utility model has the advantages that:
the utility model relates to a lens dark angle testing device based on an active light source, which takes a box body as a main body, is internally provided with optical elements such as a TIR lens, a light homogenizing sheet, a light shielding plate, a mirror hole and the like so as to simulate uniform parallel rays of the indoor active light source, and then a camera acquires a light source image for correcting the dark angle.
The testing device provided by the utility model has the advantages of simple structure, convenience in use and good light source effect, is applied to the work of calibrating camera dark angle test and correction, simplifies the process of dark angle test, reduces the cost of lens dark angle test, improves the efficiency of lens dark angle test, and has strong practicability and wide applicability.
Drawings
FIG. 1 is a schematic diagram of a testing apparatus according to the present utility model.
The meaning of the symbols in the drawings is as follows: 1. the light source module comprises a box body 2, a light source module 3, a TIR lens 4, a light homogenizing sheet 5, a light shielding plate 6, a mirror hole 7, a camera base 8 and a camera.
Detailed Description
The utility model is described in detail below with reference to the drawings and the specific embodiments.
A lens dark angle testing device based on an active light source consists of a box body 1, a light source module 2, a TIR lens 3, a light homogenizing sheet 4 and a light shielding plate 5.
The cavity in the box 1 is arranged, a light source module 2 is arranged on one side wall in the box 1, and a transparent mirror hole 6 is arranged on the other side wall.
Along the light direction, set gradually TIR lens 3, light homogenizing sheet 4 and light screen 5 in the box 1, light screen 5 is equipped with mirror hole 6, and the light screen constitutes the other end lateral wall of box promptly, and TIR lens 3, light homogenizing sheet 4, the central line in mirror hole 6 unifies.
Preferably, the light source module 2 is composed of a plurality of uniformly distributed LED lamps, and the power supply supplies power to the LED lamps.
Preferably, the light shielding plate is a movable plate and is adsorbed at the end side of the box body in a magnetic attraction mode.
The lens hole 6 is used for placing a lens of a camera 8 to be tested. According to the size of the lens of the camera to be tested, a light shielding plate which is adaptive to the lens hole of the lens of the camera to be tested can be selected.
The camera seat 7 for placing the camera to be tested is also arranged outside the box body 1, and preferably, the camera seat 7 is adsorbed outside the box body 1 in a magnetic attraction mode. That is, according to different camera sizes, the camera mount 7 with different sizes can be replaced, so that the lenses of different cameras can be embedded in the lens hole 6, so that the stability of the camera of the lens hole, that is, the stability of the measurement process, can be maintained.
In the use process, the water-soluble fiber is prepared,
the camera to be tested is placed on the camera base 7, and the lens extends into the lens hole 6.
The box body 1 is used as a shell, plays a role in protecting components in the box body 1 while playing a light-shielding function.
The indoor active light source is simulated by the light generated by the LED lamp.
Changing the light path of divergent light of the LED lamp into parallel light through the TIR lens 3 to form a parallel light source; the method comprises the following steps: the light with small angle is collimated by the refraction surface by the TIR lens, and the light with large angle is collimated by the reflection surface, so that quasi-parallel light is obtained. The use of a TIR lens can improve the light energy utilization of the LED.
The light homogenizing sheet 4 receives the parallel light source passing through the TIR lens 3, and the parallel light passes through the light homogenizing sheet 4 to form a uniform parallel light source, i.e. a uniform parallel light source based on the indoor active light source. Then the light is intercepted by the light shielding plate 5, and the local light is emitted at the mirror hole.
And collecting uniform parallel light images by a lens matched with the lens hole.
In the course of the test, the test pieces were tested,
first, gain and integration time parameters of the camera are set, automatic shading compensation of the camera is turned off, and black level parameters of the camera are set. The purpose is to eliminate the influence of other factors on camera imaging, namely the influence of other factors on the image to be acquired during the dark angle test.
The specific setting of the gain and integration time parameters of the calibrated camera is finished by depending on related software, which is mainly determined by a chip built in the camera, for example, an X-production chip is built in the camera, and when the parameters of the camera are adjusted, the camera is connected with software matched with the X-production chip through a network port, and the parameters of the camera are adjusted by the software.
"setting the gain and integration time parameters of the camera" is to provide necessary data for the operation of adjusting the black level parameters of the camera. Physical devices in the camera (such as some circuits and chips built in the camera) are not ideal, and even if no light irradiates the pixels, the pixels generate charges, and the charges generate dark currents, which affect image signals, so that imaging of the camera is affected, and therefore, black level parameters of the camera need to be adjusted, so that image quality is ensured.
The automatic shading compensation of the camera is turned off in order to avoid the influence of the automatic shading compensation of the camera on the imaging of the camera, thereby influencing the data for vignetting correction, i.e. influencing the result of the vignetting test.
The testing process comprises the following steps:
firstly, placing a lens of a camera at a lens hole 6 of the utility model;
step two, adjusting the focal length of a camera, and collecting 1-5 light source images (the images are RAW format) under different focal lengths;
thirdly, verifying the collected light source image, wherein the specific operation is as follows:
s1, according to the requirement A, if the acquired light source images all meet the requirement A, executing S3, otherwise executing S2;
specifically, requirement a: the pixel value B of the central point of the collected light source image is about 500 (the amplitude is 20), namely the requirement a is met, otherwise, the requirement a is not met.
S2, if part or all of the acquired light source images do not meet the requirement A, different adjustment can be performed according to different conditions. Specifically, two cases can be distinguished: firstly, if the pixel value B of the center point is higher than 500, the exposure time of the camera is reduced, and then a second step is executed; and secondly, if the pixel value B of the center point is lower than 500, the exposure time of the camera is increased, and then the second step is executed.
(the procedure of testing the dark angle is completed, S3 is used for realizing the purpose of the operation of testing the dark angle-correcting the dark angle)
S3, analyzing the collected light source images by related software S to obtain data C, and writing the data C into the camera through the network port to finish camera dark angle correction.
And fourthly, repeating the second step to the third step every time the focal length is adjusted until all the focal lengths are traversed.
In the testing process, besides adjusting the focal length, the acquired light source images can be adjusted or obtained in a differentiated mode by adjusting the intensity of the light source.
The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be appreciated by persons skilled in the art that the above embodiments are not intended to limit the utility model in any way, and that all technical solutions obtained by means of equivalent substitutions or equivalent transformations fall within the scope of the utility model.
Claims (7)
1. The device for testing the camera lens dark angle based on the active light source is characterized by comprising a cavity box body;
a light source module opposite to the other end is arranged on the side wall of the end in the box body,
a TIR lens, a light homogenizing sheet and a shading plate with a mirror hole are sequentially arranged in the box body along the light direction;
the lens hole is used for placing a lens of a camera to be tested.
2. The test device of claim 1, wherein the light source module comprises a plurality of LED lamps, and a power supply for powering the LED lamps.
3. The test device of claim 1, wherein the TIR lens, light homogenizing sheet and mirror aperture have a uniform midline.
4. The testing device of claim 1, wherein the light shield is disposed at the other side of the housing.
5. The test device of claim 4, wherein the light shield is magnetically attached to the other end of the housing.
6. The test device of claim 1, further comprising a camera mount secured to the exterior of the housing.
7. The test device of claim 6, wherein the camera mount is magnetically attached to the exterior of the housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322526557.6U CN220775934U (en) | 2023-09-18 | 2023-09-18 | Lens dark angle testing device based on active light source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322526557.6U CN220775934U (en) | 2023-09-18 | 2023-09-18 | Lens dark angle testing device based on active light source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220775934U true CN220775934U (en) | 2024-04-12 |
Family
ID=90617415
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322526557.6U Active CN220775934U (en) | 2023-09-18 | 2023-09-18 | Lens dark angle testing device based on active light source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220775934U (en) |
-
2023
- 2023-09-18 CN CN202322526557.6U patent/CN220775934U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108760765B (en) | Side-view camera shooting-based surface damage defect detection device and method | |
| CN110346120B (en) | System and method for testing strong light resolution and dynamic range of automatic gate control image intensifier | |
| WO2023001306A1 (en) | Exposure surface calibration method and apparatus for optical system, calibration measurement method and apparatus, computer device, and storage medium | |
| CN109714535B (en) | Automatic focusing machine vision measuring device and method based on chromatic aberration | |
| KR101240947B1 (en) | Vision inspection apparatus | |
| US9894255B2 (en) | Method and system for depth selective segmentation of object | |
| McCann et al. | Camera and visual veiling glare in HDR images | |
| CN114636385B (en) | Three-dimensional imaging method and system based on light field camera and three-dimensional imaging measurement production line | |
| CN108510462A (en) | A kind of method and terminal of the exposure response of correction camera | |
| CN109660736A (en) | Method for correcting flat field and device, image authentication method and device | |
| CN107995396B (en) | Two camera modules and terminal | |
| CN102460271B (en) | Optical filter and display evaluation system | |
| CN107835351B (en) | Two camera modules and terminal | |
| JP2005070025A (en) | Light source testing system and method | |
| CN220775934U (en) | Lens dark angle testing device based on active light source | |
| CN112929623B (en) | Lens shadow repairing method and device applied to whole screen in correction process | |
| CN105445570B (en) | A kind of wide-angle shot machine signal-to-noise test system and measuring method | |
| CN207589006U (en) | A kind of wide-angle camera module and terminal | |
| CN115037922A (en) | Uniform light source platform for camera calibration, and non-uniformity measurement and correction method | |
| CN210274226U (en) | Optical filter device for improving dynamic range of photoelectric imaging equipment | |
| CN110191258B (en) | Image sensor with a plurality of pixels | |
| CN113483655A (en) | PCB detection system and method | |
| CN111586402B (en) | System and method for testing static transfer function of visible light space camera | |
| CN113014909A (en) | Method and device for calibrating CMOS image sensor and CMOS image sensor module | |
| CN107995487B (en) | EMCCD blind pixel testing system and method based on light homogenizing collimator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant |