CN106125497B - A kind of brightness uniformity detection method of wide-angle imaging mould group - Google Patents
A kind of brightness uniformity detection method of wide-angle imaging mould group Download PDFInfo
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- CN106125497B CN106125497B CN201610809124.3A CN201610809124A CN106125497B CN 106125497 B CN106125497 B CN 106125497B CN 201610809124 A CN201610809124 A CN 201610809124A CN 106125497 B CN106125497 B CN 106125497B
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- mould group
- angle imaging
- imaging mould
- photo
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B43/00—Testing correct operation of photographic apparatus or parts thereof
Abstract
The invention discloses a kind of brightness uniformity detection methods of wide-angle imaging mould group.The light-emitting surface for the light emitting source that the detection method uses is concave spherical surface in one, the wide-angle imaging mould group shoots the light-emitting surface and obtains photo, whether the value by reading and comparing brightness value/middle section brightness value of the fringe region of the photo is greater than or equal to 60%, to judge that the brightness uniformity of the wide-angle imaging mould group detects whether qualification.The error of the brightness uniformity testing result that can not only reduce wide-angle imaging mould group of the detection method, additionally it is possible to detect the edge dirt pits of wide-angle imaging mould group.
Description
Technical field
The present invention relates to camera module detection field more particularly to a kind of brightness uniformity detection sides of wide-angle imaging mould group
Method.
Background technique
Brightness uniformity (shading) is for evaluating camera module performance important indicator, if camera module
Brightness irregularities, the brightness for shooting the fringe region and middle section of the photo come can have big difference, and such as edge occur
Secretly, the bright situation in center.
In the prior art, generally the brightness uniformity of camera module is detected using a source of parallel light, camera module
Photo is shot and obtained to source of parallel light, by brightness value and the central area of reading and compare the fringe region of photo
Brightness value is detected with the brightness uniformity to camera module.But for wide-angle imaging mould group, flat luminous source hair
The angular field of view of camera lens cannot be completely covered in light out, and light reaches the distance of optical center than reaching lens edge
Distance wants small, this can generate gross error to brightness uniformity testing result, leads to the brightness value ratio of the fringe region detected
Intrinsic brilliance value wants small situation.
Summary of the invention
In order to solve above-mentioned the deficiencies in the prior art, the present invention provides a kind of brightness uniformity detection of wide-angle imaging mould group
Method.The light-emitting surface for the light emitting source that the detection method uses is concave spherical surface in one, compared with source of parallel light in the prior art, hair
The angular field of view of the camera lens of wide-angle imaging mould group can be completely covered in the light that smooth surface issues, and light reaches wide-angle imaging mould
The optical center of group is consistent with the distance of lens edge, can reduce the mistake of the brightness uniformity testing result of wide-angle imaging mould group
Difference；It can also detect the edge dirt pits of wide-angle imaging mould group.
The technical problems to be solved by the invention are achieved by the following technical programs:
A kind of brightness uniformity detection method of wide-angle imaging mould group, includes the following steps:
S1: providing a light emitting source and a wide-angle imaging mould group, and the light emitting source has light-emitting surface, and the light-emitting surface is indent
Spherical surface；
S2: the wide-angle imaging mould group is placed on the centre of sphere corresponding to the light-emitting surface, and the wide-angle imaging mould
For the camera lens of group towards the light-emitting surface, the light-emitting surface at least covers the angular field of view of the camera lens of the wide-angle imaging mould group；
S3: the wide-angle imaging mould group shoots the light-emitting surface and obtains a photo；
S4: the brightness value of the middle section of the photo and the brightness value of fringe region are read；
S5: if the value of brightness value/middle section brightness value of the fringe region is greater than or equal to acceptance value, this is wide
The brightness uniformity of angle camera module is detected as qualification.
Further, in step s 4, middle section of the brightness value as the photo of the central point of the photo is chosen
Brightness value.
Further, in step s 4, being averaged for the brightness value of at least two o'clock in the central area of the photo is chosen
It is worth the brightness value of the central area as the photo.
Further, in step s 4, the flat of the brightness value of at least each point on four sides of the photo is chosen
Brightness value of the mean value as the fringe region of the photo.
Further, the average value of the brightness value at four angles of the photo is chosen as the bright of the fringe region of the photo
Angle value.
Further, the colour temperature of the light emitting source is 2000k ~ 7500K.
Further, the illumination of the light emitting source is 1lux ~ 2000lux.
Further, the light emitting source is colour temperature and the adjustable light emitting source of illumination.
Further, the illuminance uniformity of the light emitting source is less than 5%.
The invention has the following beneficial effects:
(1) light-emitting surface for the light emitting source that the detection method uses is concave spherical surface in one, with source of parallel light in the prior art
It compares, the angular field of view of the camera lens of wide-angle imaging mould group can be completely covered in the light that light-emitting surface issues, and light reaches extensively
The optical center of angle camera module and the distance of lens edge are consistent, can reduce the brightness uniformity detection of wide-angle imaging mould group
As a result error；
(2) since the light that light-emitting surface issues completely covers the angular field of view of the camera lens of wide-angle imaging mould group, with the naked eye
The dirt pits that lens edge can be directly observed from the photo shot in brightness uniformity detection process, to wide-angle imaging mould group
Edge dirt pits is detected.
Detailed description of the invention
Fig. 1 is the schematic diagram of the brightness uniformity detection method of wide-angle imaging mould group provided by the invention；
Fig. 2 is that the brightness value of the photo in the brightness uniformity detection method of wide-angle imaging mould group provided by the invention is chosen
A kind of embodiment of point.
Specific embodiment
The present invention will be described in detail with reference to the accompanying drawings and examples.
A kind of brightness uniformity detection method of wide-angle imaging mould group, includes the following steps:
S1: providing a light emitting source and a wide-angle imaging mould group, and the light emitting source has light-emitting surface, and the light-emitting surface is indent
Spherical surface；
S2: the wide-angle imaging mould group is placed on the centre of sphere corresponding to the light-emitting surface, and the wide-angle imaging mould
The camera lens of group is towards the light-emitting surface, and the light-emitting surface at least covers the angular field of view of the camera lens of the wide-angle imaging mould group, such as
Shown in Fig. 1；
S3: the wide-angle imaging mould group shoots the light-emitting surface and obtains a photo；
S4: the brightness value of the middle section of the photo and the brightness value of fringe region are read；
Wherein, the brightness value of the brightness value of the central point of the photo as the middle section of the photo is chosen, alternatively, choosing
Take the average value of the brightness value of at least two o'clock in the central area of the photo as the brightness value of the central area of the photo；
The average value of the brightness value of at least each point on four sides of the photo is chosen as the bright of the fringe region of the photo
Angle value, it is preferable that choose the brightness value of the average value of the brightness value at four angles of the photo as the fringe region of the photo.
S5: if the value of brightness value/middle section brightness value of the fringe region is greater than or equal to acceptance value, this is wide
The brightness uniformity of angle camera module is detected as qualification.
The acceptance value is 60%.
Citing as shown in Fig. 2, choose photo four angles and read its corresponding brightness value M1, M2, M3 and M4, calculate
The brightness value M of fringe region=(M1+M2+M3+M4)/4；It chooses the central point of photo and reads its corresponding brightness value M0 conduct
The brightness value of central area, if M/M0 >=60%, the brightness uniformity of the wide-angle imaging mould group is detected as qualification.Above-mentioned implementation
Example is one of numerous embodiments of the technical program, should not be as limit.
If the colour temperature of the light emitting source is relatively low, will lead to wide-angle imaging mould group shoot come photo picture partially it is red simultaneously
Error is generated to brightness uniformity testing result, therefore, the colour temperature of the light emitting source is preferably 2000k ~ 7500K；If the hair
The illumination of light source is relatively low, then will lead to the picture that wide-angle imaging mould group shoots the photo come and noise occur and to brightness uniformity
Testing result generates error, and therefore, the illumination of the light emitting source is preferably 1lux ~ 2000lux；Preferably, the light emitting source is
Colour temperature and the adjustable light emitting source of illumination.
If the illumination of the light emitting source has big difference, the brightness that will lead into the light of wide-angle imaging mould group is different
It causes, and error is generated to the brightness uniformity testing result of wide-angle imaging mould group, therefore, the illuminance uniformity of the light emitting source is small
In 5%, i.e. minimal illumination/average illumination value is less than 5%.
The light-emitting surface for the light emitting source that the technical program uses is interior concave spherical surface, compared with source of parallel light in the prior art,
The light that light-emitting surface issues completely covers the entire angular field of view of the camera lens of wide-angle imaging mould group, and light reaches wide-angle and takes the photograph
As the optical center of mould group and the distance of lens edge are consistent, the brightness uniformity testing result of wide-angle imaging mould group can reduce
Error；It, with the naked eye can be straight since the light that light-emitting surface issues completely covers the angular field of view of the camera lens of wide-angle imaging mould group
The dirt pits that lens edge is observed from the photo shot in brightness uniformity detection process is connect, to the edge of wide-angle imaging mould group
Dirt pits is detected.
Embodiments of the present invention above described embodiment only expresses, the description thereof is more specific and detailed, but can not
Therefore limitations on the scope of the patent of the present invention are interpreted as, as long as skill obtained in the form of equivalent substitutions or equivalent transformations
Art scheme should all be fallen within the scope and spirit of the invention.
Claims (9)
1. a kind of brightness uniformity detection method of wide-angle imaging mould group, which comprises the steps of:
S1: providing a light emitting source and a wide-angle imaging mould group, and the light emitting source has light-emitting surface, and the light-emitting surface is indent ball
Face；
S2: the wide-angle imaging mould group is placed on the centre of sphere corresponding to the light-emitting surface, and the wide-angle imaging mould group
For camera lens towards the light-emitting surface, the light-emitting surface at least covers the angular field of view of the camera lens of the wide-angle imaging mould group；
S3: the wide-angle imaging mould group shoots the light-emitting surface and obtains a photo；
S4: the brightness value of the middle section of the photo and the brightness value of fringe region are read.
2. the brightness uniformity detection method of wide-angle imaging mould group according to claim 1, which is characterized in that in step S4
In, choose the brightness value of the brightness value of the central point of the photo as the middle section of the photo.
3. the brightness uniformity detection method of wide-angle imaging mould group according to claim 1, which is characterized in that in step S4
In, the average value of the brightness value of at least two o'clock in the central area of the photo is chosen as the bright of the central area of the photo
Angle value.
4. the brightness uniformity detection method of wide-angle imaging mould group according to claim 1, which is characterized in that in step S4
In, the average value of the brightness value of at least each point on four sides of the photo is chosen as the fringe region of the photo
Brightness value.
5. the brightness uniformity detection method of wide-angle imaging mould group according to claim 4, which is characterized in that described in selection
Brightness value of the average value of the brightness value at four angles of photo as the fringe region of the photo.
6. the brightness uniformity detection method of wide-angle imaging mould group according to claim 1, which is characterized in that described to shine
The colour temperature in source is 2000k ~ 7500K.
7. the brightness uniformity detection method of wide-angle imaging mould group according to claim 1, which is characterized in that described to shine
The illumination in source is 1lux ~ 2000lux.
8. the brightness uniformity detection method of wide-angle imaging mould group according to claim 1, which is characterized in that described to shine
Source is colour temperature and the adjustable light emitting source of illumination.
9. the brightness uniformity detection method of wide-angle imaging mould group according to claim 1, which is characterized in that described to shine
The illuminance uniformity in source is less than 5%.
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| CN106949410A (en) * | 2017-05-18 | 2017-07-14 | 信利光电股份有限公司 | A kind of light supply apparatus |
| CN107071400A (en) * | 2017-05-31 | 2017-08-18 | 信利光电股份有限公司 | A kind of optical centre measuring system of wide-angle imaging module |
| CN109212886A (en) * | 2017-06-30 | 2019-01-15 | 鸿富锦精密工业（深圳）有限公司 | Fisheye camera mould group image test device |
| CN107734328B (en) * | 2017-11-08 | 2019-06-04 | 信利光电股份有限公司 | A kind of the calibration method for burn-recording and device of camera |
| CN109285193A (en) * | 2018-07-11 | 2019-01-29 | 信利光电股份有限公司 | The image mosaic caliberating device and detection system of more camera lens multisensor photographic devices |
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| CN101207833B (en) * | 2006-12-19 | 2010-05-19 | Tcl数码科技（深圳）有限责任公司 | Method for checking optical centre bias of lens of digital camera |
| CN100582932C (en) * | 2007-04-02 | 2010-01-20 | 鸿富锦精密工业（深圳）有限公司 | Apparatus and method for detecting camera module group dark angle |
| CN100592202C (en) * | 2007-05-15 | 2010-02-24 | 鸿富锦精密工业（深圳）有限公司 | Camera module group image test system and method |
| CN103983429B (en) * | 2014-04-22 | 2016-09-21 | 常州市武进区半导体照明应用技术研究院 | Light-emitting surface brightness analysis of Uniformity method |
| CN105628195A (en) * | 2014-10-31 | 2016-06-01 | 富泰华工业（深圳）有限公司 | Light source brightness detecting system and method |
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