CN106506980A - A kind of based on the light source self-adaptation control method for judging image pixel intensity - Google Patents
A kind of based on the light source self-adaptation control method for judging image pixel intensity Download PDFInfo
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- CN106506980A CN106506980A CN201610965927.8A CN201610965927A CN106506980A CN 106506980 A CN106506980 A CN 106506980A CN 201610965927 A CN201610965927 A CN 201610965927A CN 106506980 A CN106506980 A CN 106506980A
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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
- H04N23/74—Circuitry for compensating brightness variation in the scene by influencing the scene brightness using illuminating means
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Abstract
The present invention relates to a kind of realized using LabVIEW softwares based on the light source self-adaptation control method for judging image pixel intensity, step is as follows：Light source is set in any intensity by light source controller to illuminate a certain specific scene；Correctly configure CCD camera on computers, adjust the focal length and aperture of camera；The pixel histogram of image is obtained, pixel average is asked for；Add a brightness regulation knob, to simulate the adjusting knob of control light source controller；According to the one threshold decision interval of pixel mean set in histogram, this is interval as the standard for judging, it is judged to illuminate when pixel average is more than this threshold interval too strong.Conversely, being then judged to that illumination is not enough；Corresponding operation is taken to adjust the illumination intensity of light source according to judged result output end.
Description
Technical field
The present invention relates to a kind of based on the light source autocontrol method for judging image pixel intensity, belong to adaptive optics neck
Domain；
Background technology
Machine vision plays more and more important role at aspects such as quality testing, process control, three-dimensionalreconstructions.Machine
The key of device vision is exactly the image for obtaining to be analyzed accordingly and is processed, so the quality of image directly decides machine
The validity of vision, and the quality for obtaining image depends on image capture device and lighting apparatus.
But in most of the cases, the control of lighting apparatus intensity be all mostly by the way of adjusting manually, this
Mode is not suitable for the automation in actual production and intellectuality, and with very strong artificial subjectivity, is unfavorable for image
Obtain and follow-up image procossing.Especially in the environment of industrial production, the artificial intensity for adjusting lighting apparatus manually is even more not
Correspond to reality.This is based on, the automatic control technology of light source is particularly important in the development of machine vision.
Content of the invention
Present invention seek to address that in machine vision, adjusting the defect of lighting apparatus mode manually, there is provided a kind of being based on is sentenced
The light source self-adaptation control method of disconnected image pixel intensity.The present invention based on to obtain image pixel distribution judge, root
It is judged that as a result automatically adjusting light source illumination intensity.Technical scheme is as follows：
A kind of based on the light source self-adaptation control method for judging image pixel intensity, realized using LabVIEW softwares, step
As follows：
(1) light source is set in by any intensity by light source controller illuminating a certain specific scene；
(2) correctly configure CCD camera on computers, adjust the focal length and aperture of camera, to obtain in this illumination bar
The optimal acquisition effect of scene under part；
(3) path that CCD camera gathers image is read using LabVIEW, and shown in front panel, obtain image
Pixel histogram, ask for pixel average；
(4) add a brightness regulation knob in LabVIEW, to simulate the adjusting knob of control light source controller, real
The illumination intensity of light source is now directly adjusted by LabVIEW；
It is (5) according to the one threshold decision interval of pixel mean set in histogram, this is interval as the standard for judging,
It is judged to illuminate when pixel average is more than this threshold interval too strong.Conversely, being then judged to that illumination is not enough；
(6) judged result in step (5) is transferred to the input of light source controller, is adopted according to judged result output end
Take the illumination intensity that corresponding operation adjusts light source.
Compared with the prior art, the invention has the advantages that：
1>Solve existing manual regulation light source strong and weak the drawbacks of, it is to avoid subjective human factor is obtained to image and follow-up
The adverse effect of process；
2>Existing artificial regulation light source mode do not applied under some dangerous production environments, and light source is automatically controlled
Method can be avoided the mankind in this hazardous environment；
3>In the production line of industry, it is impossible human intervention to adjust the intensity of light source manually, and light source
Autocontrol method then can achieve this automation；
4>The device of light source autocontrol method is all based on the conventional device of machine vision, without the need for adding other devices
Part, can meet the requirement of low-cost system structure.
Specific embodiment
With reference to instantiation, the present invention will be further described；
The light source automaton of the present invention, image capture device regard CCD phases for the 8-bit dimensions of MV-EM120M models
Machine, lighting apparatus are Philip LED panel lamp, and light source controller is the Ao Pute light source controllers of DPA1024E-4 models, counts
Installation LabVIEW softwares are needed to carry out image procossing on calculation machine.
The image gathered using CCD camera, the pixel histogram shown using LabVIEW judge to shine according to pixel distribution
The result of bright intensity.Read in computer using LabVIEW and deposit the path that CCD camera gathers image, the image of reading is shown
Show in front panel.Obtain image in every bit image pixel intensities, by histogram by the pixel distribution of entire image intuitively
Express, Pixel-level of the abscissa for 0-255, ordinate is the frequency of each Pixel-level.The average of image pixel is calculated,
It is shown in front panel, using this pixel average as the index for subsequently judging.
It is distributed according to the grey level histogram of present image, sets a rational threshold decision interval, by this threshold interval
As the standard for judging.When pixel average is in this threshold interval, illumination is not enough and illuminate too strong indicator lamp be all green,
Be judged as that illumination condition now is normal, when pixel average is less than this threshold interval, corresponding illumination deficiency indicator lamp by
Normal green is changed into red, represents and is judged to that illumination is not enough.Conversely, when pixel average is more than this threshold interval, corresponding
The too strong indicator lamp of illumination be changed into red from normal green, represent be judged to illuminate too strong.
On the front panel that LabVIEW adjusts the intensity of light source, corresponding to normal judged result is illuminated, current photograph is kept
Bright state, does not do any regulation operation to the intensity of light source；Corresponding to the judged result that illumination is not enough, result is converted into numeral
Signal is sent to the input of light source controller, then output end executes corresponding operation to light source, and light source is lightened；Corresponding to photograph
Result is converted into the input that data signal is sent to light source controller by bright too strong judged result, then output end is to light source
Corresponding operation is executed, by light source dim.
This is based on, automatic control system of light source achieves the Self Adaptive Control to lighting source, and the system is without the need for people
For intervening, can be with the work of long-time stable.When external environmental light changes or illuminated scene changes, according to
The pixel histogram distribution of new collection image after environmental change, sets a rational threshold decision interval, re-executes step
(1)-(6), you can set up an automatic control system of light source for being suitable for new working environment.Therefore, the light source automatically controls and is
System has general applicability.
Claims (1)
1. a kind of based on the light source self-adaptation control method for judging image pixel intensity, realize that step is such as using LabVIEW softwares
Under：
(1) light source is set in by any intensity by light source controller illuminating a certain specific scene；
(2) correctly configure CCD camera on computers, adjust the focal length and aperture of camera, to obtain under this lighting condition
The optimal acquisition effect of scene；
(3) path that CCD camera gathers image is read using LabVIEW, and shown the picture for obtaining image in front panel
Plain histogram, asks for pixel average；
(4) add a brightness regulation knob in LabVIEW, to simulate the adjusting knob of control light source controller, realize logical
Cross the illumination intensity that LabVIEW directly adjusts light source；
(5) according to the one threshold decision interval of pixel mean set in histogram, this is interval as the standard for judging, work as picture
Plain average is judged to illuminate too strong when being more than this threshold interval.Conversely, being then judged to that illumination is not enough；
(6) judged result in step (5) is transferred to the input of light source controller, phase is taken according to judged result output end
The operation that answers adjusts the illumination intensity of light source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610965927.8A CN106506980A (en) | 2016-11-04 | 2016-11-04 | A kind of based on the light source self-adaptation control method for judging image pixel intensity |
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| CN201610965927.8A CN106506980A (en) | 2016-11-04 | 2016-11-04 | A kind of based on the light source self-adaptation control method for judging image pixel intensity |
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| CN106506980A true CN106506980A (en) | 2017-03-15 |
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| CN201610965927.8A Pending CN106506980A (en) | 2016-11-04 | 2016-11-04 | A kind of based on the light source self-adaptation control method for judging image pixel intensity |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109429011A (en) * | 2017-09-04 | 2019-03-05 | 佳能株式会社 | Flying object, mobile device, control method and storage medium |
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| WO2016078598A1 (en) * | 2014-11-19 | 2016-05-26 | 刘皓挺 | Combined lighting apparatus and method based on image quality control |
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| CN102387631A (en) * | 2010-10-19 | 2012-03-21 | 刘江 | Automatic judgment and adjustment method of light intensity in immunochromatography interpretation recorder |
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Application publication date: 20170315 |
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