CN106125497A - A kind of brightness uniformity detection method of wide-angle imaging module - Google Patents
A kind of brightness uniformity detection method of wide-angle imaging module Download PDFInfo
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- CN106125497A CN106125497A CN201610809124.3A CN201610809124A CN106125497A CN 106125497 A CN106125497 A CN 106125497A CN 201610809124 A CN201610809124 A CN 201610809124A CN 106125497 A CN106125497 A CN 106125497A
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- angle imaging
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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
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Abstract
The invention discloses the brightness uniformity detection method of a kind of wide-angle imaging module.The light-emitting area of the luminous source that this detection method uses is concave spherical surface in, described light-emitting area is shot and obtains photo by described wide-angle imaging module, by reading described in also comparison, whether the value of the brightness value of the brightness value/middle section of the marginal area of photo is more than or equal to 60%, qualified to judge that the brightness uniformity of this wide-angle imaging module detects whether.The error of the brightness uniformity testing result that can not only reduce wide-angle imaging module of this detection method, additionally it is possible to the edge dirt pits of wide-angle imaging module detected.
Description
Technical field
The present invention relates to camera module detection field, particularly relate to the brightness uniformity detection side of a kind of wide-angle imaging module
Method.
Background technology
Brightness uniformity (shading) is for evaluating camera module performance important indicator, if camera module
Brightness irregularities, the marginal area of its photo shooting out and the brightness of middle section can have big difference, and such as edge occur
Secretly, the situation that center is bright.
In prior art, the brightness uniformity of camera module is detected by general employing one source of parallel light, camera module
Source of parallel light is shot and obtains photo, by reading and the brightness value of marginal area of contrast photo and central area
Brightness value, detects with the brightness uniformity to camera module.But for wide-angle imaging module, flat luminous source is sent out
The light gone out can not be completely covered the angular field of view of camera lens, and the distance ratio that light arrives optical center arrives lens edge
Distance is little, and this can produce gross error to brightness uniformity testing result, causes the brightness value ratio of the marginal area detected
Intrinsic brilliance value wants little situation.
Summary of the invention
In order to solve above-mentioned the deficiencies in the prior art, the present invention provides the brightness uniformity of a kind of wide-angle imaging module to detect
Method.The light-emitting area of the luminous source that this detection method uses is concave spherical surface in, compared with source of parallel light of the prior art, sends out
The light that bright finish sends can be completely covered the angular field of view of the camera lens of wide-angle imaging module, and light arrives wide-angle imaging mould
The optical center of group is consistent with the distance of lens edge, it is possible to reduce the mistake of the brightness uniformity testing result of wide-angle imaging module
Difference；The edge dirt pits of wide-angle imaging module can also be detected.
The technical problem to be solved is achieved by the following technical programs:
The brightness uniformity detection method of a kind of wide-angle imaging module, comprises the steps:
S1: provide a luminous source and a wide-angle imaging module, described luminous source has light-emitting area, and described light-emitting area is indent ball
Face；
S2: described wide-angle imaging module is placed on the centre of sphere corresponding to described light-emitting area, and described wide-angle imaging module
Camera lens is towards described light-emitting area, and described light-emitting area at least covers the angular field of view of the camera lens of described wide-angle imaging module；
S3: described wide-angle imaging module shoots to described light-emitting area and obtains a photo；
S4: read the brightness value of the middle section of described photo and the brightness value of marginal area；
S5: if the value of the brightness value of the brightness value/middle section of described marginal area is more than or equal to 60%, then this wide-angle imaging
It is qualified that the brightness uniformity of module is detected as.
Further, in step s 4, the brightness value of central point of described photo is chosen as the middle section of this photo
Brightness value.
Further, in step s 4, brightness value average of in the central area of described photo 2 is chosen
It is worth the brightness value of the central area as this photo.
Further, in step s 4, brightness value flat of the most each point on four limits of described photo is chosen
Average is as the brightness value of the marginal area of this photo.
Further, the meansigma methods of brightness value at four angles of described photo is chosen as marginal area bright of this photo
Angle value.
Further, the colour temperature of described luminous source is 2000k ~ 7500K.
Further, the illumination of described luminous source is 1lux ~ 2000lux.
Further, described luminous source is colour temperature and the most adjustable luminous source of illumination.
Further, the illuminance uniformity of described luminous source is less than 5%.
There is advantages that
(1) light-emitting area of the luminous source that this detection method uses is concave spherical surface in, compared with source of parallel light of the prior art,
The light that light-emitting area sends can be completely covered the angular field of view of the camera lens of wide-angle imaging module, and light arrives wide-angle imaging
The optical center of module is consistent with the distance of lens edge, it is possible to reduce the brightness uniformity testing result of wide-angle imaging module
Error；
(2) light sent due to light-emitting area completely covers the angular field of view of camera lens of wide-angle imaging module, with the naked eye can be straight
Connect the dirt pits observing lens edge during brightness uniformity detects the photo of shooting, the edge to wide-angle imaging module
Dirt pits detects.
Accompanying drawing explanation
The schematic diagram of the brightness uniformity detection method of the wide-angle imaging module that Fig. 1 provides for the present invention；
The brightness value selected point of the photo in the brightness uniformity detection method of the wide-angle imaging module that Fig. 2 provides for the present invention
A kind of embodiment.
Detailed description of the invention
The present invention will be described in detail with embodiment below in conjunction with the accompanying drawings.
The brightness uniformity detection method of a kind of wide-angle imaging module, it is characterised in that comprise the steps:
S1: provide a luminous source and a wide-angle imaging module, described luminous source has light-emitting area, and described light-emitting area is indent ball
Face；
S2: described wide-angle imaging module is placed on the centre of sphere corresponding to described light-emitting area, and described wide-angle imaging module
Camera lens is towards described light-emitting area, and described light-emitting area at least covers the angular field of view of the camera lens of described wide-angle imaging module, such as Fig. 1 institute
Show；
S3: described wide-angle imaging module shoots to described light-emitting area and obtains a photo；
S4: read the brightness value of the middle section of described photo and the brightness value of marginal area；
Wherein, choose the brightness value of central point of described photo as the brightness value of the middle section of this photo, or, choose institute
State the meansigma methods of brightness value of in the central area of photo 2 as the brightness value of the central area of this photo；Choose
The meansigma methods of the brightness value of the most each point on four limits of described photo as the brightness value of the marginal area of this photo,
Preferably, the meansigma methods of brightness value at four angles of described photo is chosen as the brightness value of the marginal area of this photo.
S5: if the value of the brightness value of the brightness value/middle section of described marginal area is more than or equal to 60%, then this Radix Rumicis
It is qualified that the brightness uniformity of camera module is detected as.
Citing, as in figure 2 it is shown, choose four angles of photo and read brightness value M1, M2, M3 and M4 of its correspondence, calculates
The brightness value M=(M1+M2+M3+M4 of marginal area)/4；The central point choosing photo the brightness value M0 conduct reading its correspondence
The brightness value of central area, if M/M0 >=60%, then the brightness uniformity of this wide-angle imaging module be detected as qualified.Above-mentioned enforcement
Example is the one in numerous embodiments of the technical program, should be as limit.
If the colour temperature of described luminous source is on the low side, then the picture that can cause the photo that wide-angle imaging module shoots out is the reddest also
Brightness uniformity testing result is produced error, and therefore, the colour temperature of described luminous source is preferably 2000k ~ 7500K；If described
The illumination of light source is on the low side, then the picture of the photo that wide-angle imaging module shoots out can be caused noise occur and to brightness uniformity
Testing result produces error, and therefore, the illumination of described luminous source is preferably 1lux ~ 2000lux；Preferably, described luminous source is
Colour temperature and the most adjustable luminous source of illumination.
If the illumination of described luminous source has big difference, then the brightness entering the light of wide-angle imaging module can be caused to differ
Causing, and the brightness uniformity testing result of wide-angle imaging module is produced error, therefore, the illuminance uniformity of described luminous source is little
In 5%, i.e. the value of minimal illumination/average illumination is less than 5%.
The light-emitting area of the luminous source that the technical program uses is interior concave spherical surface, compared with source of parallel light of the prior art,
The light that light-emitting area sends completely covers the whole angular field of view of the camera lens of wide-angle imaging module, and light arrives Radix Rumicis and takes the photograph
As the optical center of module is consistent with the distance of lens edge, it is possible to reduce the brightness uniformity testing result of wide-angle imaging module
Error；The light sent due to light-emitting area completely covers the angular field of view of the camera lens of wide-angle imaging module, with the naked eye can be straight
Connect the dirt pits observing lens edge during brightness uniformity detects the photo of shooting, the edge to wide-angle imaging module
Dirt pits detects.
Embodiment described above only have expressed embodiments of the present invention, and it describes more concrete and detailed, but can not
Therefore the restriction to the scope of the claims of the present invention it is interpreted as, as long as using the skill that the form of equivalent or equivalent transformation is obtained
Art scheme, all should fall within the scope and spirit of the invention.
Claims (9)
1. the brightness uniformity detection method of a wide-angle imaging module, it is characterised in that comprise the steps:
S1: provide a luminous source and a wide-angle imaging module, described luminous source has light-emitting area, and described light-emitting area is indent ball
Face；
S2: described wide-angle imaging module is placed on the centre of sphere corresponding to described light-emitting area, and described wide-angle imaging module
Camera lens is towards described light-emitting area, and described light-emitting area at least covers the angular field of view of the camera lens of described wide-angle imaging module；
S3: described wide-angle imaging module shoots to described light-emitting area and obtains a photo；
S4: read the brightness value of the middle section of described photo and the brightness value of marginal area；
S5: if the value of the brightness value of the brightness value/middle section of described marginal area is more than or equal to 60%, then this wide-angle imaging
It is qualified that the brightness uniformity of module is detected as.
The brightness uniformity detection method of wide-angle imaging module the most according to claim 1, it is characterised in that in step S4
In, choose the brightness value of central point of described photo as the brightness value of the middle section of this photo.
The brightness uniformity detection method of wide-angle imaging module the most according to claim 1, it is characterised in that in step S4
In, choose the meansigma methods of brightness value of in the central area of described photo 2 as central area bright of this photo
Angle value.
The brightness uniformity detection method of wide-angle imaging module the most according to claim 1, it is characterised in that in step S4
In, choose the meansigma methods of brightness value of the most each point on four limits of described photo as the marginal area of this photo
Brightness value.
The brightness uniformity detection method of wide-angle imaging module the most according to claim 4, it is characterised in that choose described
The meansigma methods of the brightness value at four angles of photo is as the brightness value of the marginal area of this photo.
The brightness uniformity detection method of wide-angle imaging module the most according to claim 1, it is characterised in that described luminescence
The colour temperature in source is 2000k ~ 7500K.
The brightness uniformity detection method of wide-angle imaging module the most according to claim 1, it is characterised in that described luminescence
The illumination in source is 1lux ~ 2000lux.
The brightness uniformity detection method of wide-angle imaging module the most according to claim 1, it is characterised in that described luminescence
Source is colour temperature and the most adjustable luminous source of illumination.
The brightness uniformity detection method of wide-angle imaging module the most according to claim 1, it is characterised in that described luminescence
The illuminance uniformity in source is less than 5%.
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| CN201610809124.3A CN106125497B (en) | 2016-09-08 | 2016-09-08 | A kind of brightness uniformity detection method of wide-angle imaging mould group |
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| CN201610809124.3A CN106125497B (en) | 2016-09-08 | 2016-09-08 | A kind of brightness uniformity detection method of wide-angle imaging mould group |
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Cited By (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 |
| CN107734328A (en) * | 2017-11-08 | 2018-02-23 | 信利光电股份有限公司 | The calibration method for burn-recording and device of a kind of camera |
| 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 |
| 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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| 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 |
| CN107734328A (en) * | 2017-11-08 | 2018-02-23 | 信利光电股份有限公司 | The calibration method for burn-recording and device of a kind 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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| CN106125497B (en) | 2019-06-07 |
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