CN105554408B - A kind of adaptive approach of machine core aperture - Google Patents
A kind of adaptive approach of machine core aperture Download PDFInfo
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- CN105554408B CN105554408B CN201510941684.XA CN201510941684A CN105554408B CN 105554408 B CN105554408 B CN 105554408B CN 201510941684 A CN201510941684 A CN 201510941684A CN 105554408 B CN105554408 B CN 105554408B
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- aperture
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/73—Circuitry for compensating brightness variation in the scene by influencing the exposure time
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/75—Circuitry for compensating brightness variation in the scene by influencing optical camera components
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Exposure Control For Cameras (AREA)
- Studio Devices (AREA)
Abstract
The invention discloses a kind of adaptive approach of machine core aperture, the specific steps of this method are as follows: starts, obtains the light exposure and zoom state of current lens；Judge whether it is overexposure scene, if so, determining f-number by adjusting time for exposure and gain, terminates；If it is not, judging whether it is low according to scene, if so, determining f-number by adjusting time for exposure and gain, terminate；If it is not, determining that f-number is best f-number, terminate.The present invention makes aperture link with zoom under normal illumination, ensure that picture quality.Simultaneously under special screne, i.e. overexposure scene or low photograph scene, aperture aperture can be adjusted, makes the maximum opening value of aperture and minimum opening value that can also link with zoom, it is ensured that the brightness of monitored picture is normal, it ensure that brightness of image, and improve image quality.
Description
Technical field
The invention belongs to the technical fields of monitoring device, and in particular to a kind of adaptive approach of machine core aperture.
Background technique
In video monitoring, machine core can adjust zoom according to focal point as common monitoring device.But due to
Optical path change inside machine core causes under different zooms, best aperture it is of different sizes.Best f-number is corresponding
Under zoom, when aperture is in this position, the highest f-number of picture quality.
But a part that current major part producer is adjusted aperture as exposure, no and zoom carry out linkage adjusting.From
And cause under different zooms, image quality decrease.
Summary of the invention
The shortcomings that present invention is to overcome in the prior art, and a kind of adaptive approach of the machine core aperture proposed.
The technical scheme is that
A kind of adaptive approach of machine core aperture of the invention, the specific steps of this method are as follows:
I starts, and obtains the light exposure and zoom state of current lens；
II judges whether it is overexposure scene, if so, determining f-number by adjusting time for exposure and gain, terminates；
III shines scene if it is not, judging whether it is low, if so, determining f-number by adjusting time for exposure and gain, ties
Beam；
IV if it is not, determine that f-number is best f-number, end.
The beneficial effects of the present invention are:
The present invention makes aperture link with zoom under normal illumination, ensure that picture quality.Simultaneously in particular field
Under scape, i.e. overexposure scene or low photograph scene, aperture aperture can be adjusted, makes the maximum opening value of aperture and minimum opening value can also
To link with zoom, it is ensured that the brightness of monitored picture is normal, that is, ensure that brightness of image, and improve image quality.By
Under different zooms, best f-number is different, therefore lens speed and minimum aperture value can also set different value, to maintain
Balance between image quality and picture brightness.
Detailed description of the invention
Fig. 1 is flow chart of the invention.
Specific embodiment
Hereinafter, technical solution of the present invention is described in detail referring to accompanying drawings and embodiments:
As shown in Figure 1, a kind of adaptive approach of machine core aperture of the invention, the specific steps of this method are as follows:
I starts, and obtains the light exposure and zoom state of current lens；
II judges whether it is overexposure scene, if so, determining f-number by adjusting time for exposure and gain, terminates；
III shines scene if it is not, judging whether it is low, if so, determining f-number by adjusting time for exposure and gain, ties
Beam；
IV if it is not, determine that f-number is best f-number, end.
In the step II, if overexposure scene, first fixes the time for exposure and gain reaches minimum value, then adjust light
The minimum aperture of circle, determines f-number.
The f-number range is set as in the range of minimum aperture value to best f-number.
The f-number is adjusted to best f-number, if image frame is excessively dark, adjusts time for exposure and gain, f-number
In best f-number.
In the step III, scene is shone if low, first the time for exposure is fixed and gain reaches maximum value, then adjust light
The maximum opening of circle, determines f-number.
The f-number range is set as in the range of lens speed to best f-number.
The f-number is adjusted to best f-number, if image frame need to degree of lightening, adjust time for exposure and gain, light
Circle value is in best f-number.
In the step IV, current lens zoom value is inquired, according to the correspondence table of zoom value and best f-number, setting is worked as
Preceding f-number is best f-number.
If being in overexposure state, upon exposure between and gain when can not all reduce, maintained by turning down aperture
Picture brightness is normal；It in order to guarantee that picture brightness is normal, and will not adjust repeatedly, when turning down aperture, need to fix
Time for exposure and gain are minimum, set the minimum aperture of aperture, i.e. adjusting f-number is in minimum aperture value Fmin to best light
In the range of circle value Fh, prevent aperture too small, the severity for causing picture quality to reduce.When f-number is adjusted to best f-number,
When picture is still excessively dark, at this time it is believed that being no longer on overexposure state, the adjusting of time for exposure and gain are opened, is kept at aperture
In best aperture position.
If shining state in low, upon exposure between and gain when can not all increase, maintained by opening large aperture
Picture brightness restores normal；It in order to guarantee that picture brightness is normal, and will not adjust, when opening large aperture, need repeatedly
Fixed time for exposure and gain are maximum, set the maximum opening of aperture, i.e., adjusting f-number is in lens speed Fmax to most
In the range of good f-number Fh, prevent aperture excessive, veiling glare is excessive, causes picture quality to reduce too many.When f-number is in most
Good f-number, picture need to degree of lightening when, at this time it is believed that being no longer on low according to state, open the adjusting of time for exposure and gain,
Aperture is kept to be in best aperture position.
If being both not at overexposure state, state is shone not also in low, then inquires current lens zoom value, and according to producer
The zoom value of offer and best f-number correspond to table or actual measurement obtains, and set current f-number as best f-number.
The present invention makes aperture link with zoom under normal illumination, ensure that picture quality.Simultaneously in particular field
Under scape, i.e. overexposure scene or low photograph scene, aperture aperture can be adjusted, makes the maximum opening value of aperture and minimum opening value can also
To link with zoom, it is ensured that the brightness of monitored picture is normal, that is, ensure that brightness of image, and improve image quality.By
Under different zooms, best f-number is different, therefore lens speed and minimum aperture value can also set different value, to maintain
Balance between image quality and picture brightness.
The above described is only a preferred embodiment of the present invention, be not intended to limit the present invention in any form, though
The right present invention has been described by way of example and in terms of the preferred embodiments, however, being not intended to limit the invention, any technology people for being familiar with this profession
Member can make a little change or modification using the technology contents disclosed certainly without departing from the scope of the present invention, at
For the equivalent embodiment of equivalent variations, but anything that does not depart from the technical scheme of the invention content, according to the technical essence of the invention
Any simple modification, equivalent change and modification to the above embodiments, belong in the range of technical solution of the present invention.
Claims (2)
1. a kind of adaptive approach of machine core aperture, the specific steps of this method are as follows:
I starts, and obtains the light exposure and zoom state of current lens；
II judges whether it is overexposure scene, if so, determining f-number by adjusting time for exposure and gain, terminates；
III shines scene if it is not, judging whether it is low, if so, determining f-number by adjusting time for exposure and gain, terminates；
IV if it is not, determine that f-number is best f-number, end；
In the step II, if overexposure scene, first fixes the time for exposure and gain reaches minimum value, then adjust aperture
Minimum aperture, determines f-number；
The f-number range is set as in the range of minimum aperture value to best f-number；
The f-number is adjusted to best f-number, if image frame is excessively dark, adjusts time for exposure and gain, f-number is in
Best f-number；
In the step III, scene is shone if low, first the time for exposure is fixed and gain reaches maximum value, then adjust aperture
Maximum opening determines f-number；
The f-number range is set as in the range of lens speed to best f-number；
The f-number is adjusted to best f-number, if image frame need to degree of lightening, adjust time for exposure and gain, f-number
In best f-number.
2. a kind of adaptive approach of machine core aperture according to claim 1, it is characterised in that: in the step IV, look into
It askes current lens zoom value and current f-number is set as best f-number according to the correspondence table of zoom value and best f-number.
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| CN201510941684.XA CN105554408B (en) | 2015-12-16 | 2015-12-16 | A kind of adaptive approach of machine core aperture |
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| CN201510941684.XA CN105554408B (en) | 2015-12-16 | 2015-12-16 | A kind of adaptive approach of machine core aperture |
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| CN105554408A CN105554408A (en) | 2016-05-04 |
| CN105554408B true CN105554408B (en) | 2019-03-19 |
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| CN108681182B (en) * | 2018-04-24 | 2020-08-04 | 浙江大华技术股份有限公司 | Aperture control method and terminal equipment |
| CN109146966B (en) * | 2018-06-26 | 2021-02-23 | 广州视源电子科技股份有限公司 | Visual SLAM front-end processing method, system, storage medium and computer equipment |
| CN110139042B (en) | 2019-04-18 | 2020-08-04 | 浙江大华技术股份有限公司 | Aperture adjusting method and device, storage medium and monitoring device |
| CN112351214B (en) * | 2020-09-22 | 2022-05-06 | 智博汽车科技(上海)有限公司 | Method and device for assisting face image acquisition, readable storage medium and vehicle |
| CN112672071B (en) * | 2021-03-16 | 2021-06-15 | 浙江华创视讯科技有限公司 | Automatic exposure method, device, electronic equipment and storage medium |
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| CN102109658A (en) * | 2009-12-28 | 2011-06-29 | 天津天地伟业数码科技有限公司 | Automatic focusing method for laser night vision device |
| CN103747188B (en) * | 2013-12-27 | 2017-10-27 | 深圳英飞拓科技股份有限公司 | Security device P iris lens aperture control method and device |
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Address after: 300384 Tianjin Xiqing District Huayuan Industrial Area (outside the ring) 8 hahihua two road. Applicant after: Tiandi Weiye Technology Co., Ltd. Address before: 300384 Tianjin Xiqing District Huayuan new technology Industrial Park (outside the ring) 8 hahihua two road. Applicant before: Tianjin Tiandy Digital Technology Co., Ltd. |
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