CN104113946A - light source illuminance adaptive control device and light source illuminance adaptive control method - Google Patents
light source illuminance adaptive control device and light source illuminance adaptive control method Download PDFInfo
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- CN104113946A CN104113946A CN201310058080.1A CN201310058080A CN104113946A CN 104113946 A CN104113946 A CN 104113946A CN 201310058080 A CN201310058080 A CN 201310058080A CN 104113946 A CN104113946 A CN 104113946A
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Abstract
The present invention discloses a light source illuminance adaptive control device and a light source illuminance adaptive control method. The device comprises an illuminance sensor arranged nearby a camera and used for detecting the illuminance of the light reflected by a strip steel surface irradiated by a light source; a light source illuminance controller connected with the illuminance sensor, and used for receiving an actual illuminance value detected by the illuminance sensor, comparing the actual illuminance value with a predetermined target illuminance value, and outputting a light source illuminance control signal; a current controller connected with the light source illuminance controller and the light source separately, and used for receiving the light source illuminance control signal, and adjusting a control current transmitted to the light source according to the light source illuminance control signal. According to the light source illuminance adaptive control device and the light source illuminance adaptive control method of the present invention, the surface detection of a strip steel product during the production process can be realized accurately and effectively.
Description
Technical field
The present invention relates to vision light source detection, particularly, is a kind of light illumination adaptive controller and method.
Background technology
In commercial Application, a kind of typical vision detection system is mainly comprised of light source, camera, camera lens and computer system.Easily understand, successfully vision detection system be unable to do without the design of suitable light source.Good light source design can make the feature of detected object clearly be different from the characteristics of image of background, obtains high-contrast image data.In addition, good light source should have suitable illumination, and too high or too low illumination all can impact image quality, therefore, designs a kind of light source that is suitable for application system most important.
Application number is a kind of method that 200510051429.4 Chinese invention patent application discloses automatic adjusting lighting equipment illumination, it utilizes illuminance transducer to record the light illumination of lighting apparatus, and the brightness value recording and object illumination value are contrasted, then conditioning equipment power supply, makes brightness value reach desired value.
Application number is that 201010539240.0 Chinese invention patent application discloses a kind of equipment that illuminates illuminated field, and this equipment can receive the actual brightness value of illuminated field, and controls according to the illumination that actual brightness value carries out lighting apparatus.
Although the scheme that above-mentioned open source literature has proposed brightness value to regulate, but, when the lighting object for different, because the surface appearance of lighting object is not taken into account, but directly by obtaining the brightness value of light source, carry out light illumination control, therefore, when the various material in for vision detection system with different surfaces situation is carried out vision-based detection, for example, when the band steel of unlike material and different surfaces situation is carried out to vision-based detection, utilize above-mentioned means can not reach accurate vision-based detection effect.
Summary of the invention
Object of the present invention, is to solve in existing vision detection system illumination and adjusts means and can not be advantageously applied to belt steel surface and detect this defect, thereby a kind of light illumination adaptive controller and method of innovation are provided.
Light illumination adaptive controller of the present invention, for the light illumination in belt steel surface detection system is controlled, this detection system comprises light source and camera, this camera is for the image of the belt steel surface that gathers this light source and irradiate for gray analysis, and this light illumination adaptive controller comprises:
Illuminance transducer, contiguous this camera of this illuminance transducer arranges, and for light source being irradiated to the illumination of belt steel surface back reflection light, detects;
Light illumination controller, this light illumination controller is connected with this illuminance transducer, the actual brightness value detecting for receiving this illuminance transducer, and contrast output light source illumination control signal with predetermined object illumination value;
Current controller, this current controller is connected with this light source with this light illumination controller respectively, for receiving this light illumination control signal, and according to this light illumination control signal, to flowing to the control electric current of this light source, adjusts.
Preferably, described light illumination adaptive controller comprises a plurality of described illuminance transducers, and described actual brightness value is the mean value of the illumination that detects of described a plurality of illuminance transducer.
Preferably, described a plurality of illuminance transducer and described camera are all fixedly installed on a mounting base.
Preferably, described current controller is constant current source control circuit.
The invention also discloses and a kind ofly utilize above-mentioned light illumination adaptive controller light illumination to be carried out to the method for adaptive control, the method comprises the steps:
Step S100, according to the target gray value of described camera calibration image, sets the object illumination value corresponding with this target gray value, and this object illumination value is stored in described light illumination controller;
Step S200, utilizes the illumination that described illuminance transducer irradiates belt steel surface back reflection light to light source to detect;
Step S300, utilizes described light illumination controller to receive the actual brightness value that this illuminance transducer detects, and contrasts output light source illumination control signal with this object illumination value;
Step S400, utilizes described current controller to receive this light illumination control signal, and according to this light illumination control signal, to flowing to the control electric current of this light source, adjusts.
Preferably, described light illumination adaptive controller comprises a plurality of described illuminance transducers, and in described step S300, and described actual brightness value is the mean value of the illumination that detects of described a plurality of illuminance transducer.
Light illumination adaptive controller of the present invention and method, can to light illumination, carry out self adaptation adjustment according to the surface reflection situation with steel, make detection system obtain the detected image that gray scale is consistent, thereby increase image quality, has improved the analysis precision of system to belt steel surface.Therefore, light illumination adaptive controller of the present invention and method, can realize accurately and effectively the surface of belt steel product in production process is detected.
Accompanying drawing explanation
Fig. 1 is the composition frame chart of light illumination adaptive controller of the present invention;
Fig. 2 is the operation principle schematic diagram of the applied belt steel surface detection system of light illumination adaptive controller of the present invention;
Fig. 3 is the illuminance transducer assembling schematic diagram of light illumination adaptive controller of the present invention in a mode;
Fig. 4 utilizes light illumination adaptive controller of the present invention to carry out the schematic flow sheet of light illumination control;
Fig. 5 is in one example, controls the schematic diagram that is related to of electric current and illumination;
Fig. 6 is in one example, controls the schematic diagram that is related to of electric current and image averaging gray scale.
Embodiment
Below in conjunction with the drawings and specific embodiments, composition, step and the operation principle of light illumination adaptive controller of the present invention and method are elaborated.
In general, light illumination adaptive controller of the present invention, can be used for the light illumination in belt steel surface detection system to control.As shown in Figure 1, 2, routinely, belt steel surface detection system comprises a light source 1 and camera 2,1 pair of light source band steel 4 irradiates, and then 2 pairs, the camera belt steel surface through irradiating detects, and obtains band steel surface image data, these data are further transported in gray scale Treatment Analysis system 3 carries out gray analysis, thereby draw the physical attribute information of belt steel surface, as mass defects such as whether surface has scuffing, is mingled with, mottling, hole, crackles, thereby strip surface quality is evaluated.
Further combined with Fig. 1, light illumination adaptive controller of the present invention, comprises illuminance transducer 10, light illumination controller 20 and current controller 30.Innovation of the present invention is, the illumination of the light receiving by 10 pairs of cameras of illuminance transducer 2 detects and draws actual illumination, utilize light illumination controller 20 that actual illumination and object illumination are contrasted, and export control signal the output current of current controller 30 is regulated, thereby the reflection brightness value of light source is adjusted to object illumination and equates the most at last, so that the gradation of image that camera 2 obtains keeps stable, thereby improve the accuracy that belt steel surface is detected.
With reference to figure 1,2, more specifically, illuminance transducer 10 can be one, also can be preferably a plurality of, and it is comprised of the transducer that can detect illumination of routine.The contiguous camera 1 of illuminance transducer 10 arranges, and it detects for light source 1 being irradiated to the illumination of belt steel surface back reflection light.Illuminance transducer 10 outputting measurement values are to follow-up light illumination controller 20.One preferred embodiment in, light illumination adaptive controller of the present invention comprises a plurality of illuminance transducers, and the actual brightness value that receives of light illumination controller 20 is the mean value of the illumination that detects of a plurality of illuminance transducers.Particularly, as shown in Figure 3, show the situation that the present invention is provided with two illuminance transducers 11,12, and a plurality of illuminance transducer 11,12 and camera are all fixedly installed on a mounting base 6.In Fig. 3, two illuminance transducers 11,12 are arranged at respectively camera 2 both sides, the actual brightness value that now light illumination controller 20 receives is the mean value of the measured brightness value of a plurality of illuminance transducers 11,12, thereby makes the illumination of the light that this actual brightness value receives close to camera.
Continuation is with reference to Fig. 1, light illumination controller 20 is connected with illuminance transducer 10, the actual brightness value detecting for receiving this illuminance transducer 10, as mentioned above, when illuminance transducer is while being a plurality of, the mean value of the brightness value that actual brightness value detects for each illuminance transducer.The object illumination value of this actual brightness value and reservation contrasts, output light source illumination control signal.Object illumination value is set according to the target gray value of predetermined camera calibration image.This target gray value refers to the average gray value at image.Target setting gray value, is in order to overcome the on-the-spot various uncertain factors that occur, comprises band steel type, temperature etc., thereby obtains the detected image that gray scale is consistent.
Current controller 30 is connected with light source 1 with light illumination controller 20 respectively, for receiving light illumination control signal, and according to light illumination control signal, to flowing to the control electric current of light source, adjusts.
At above-mentioned camera calibration, between gray scale, its corresponding illumination and the light source control electric current of image, exist approximate linear relationship.Therefore, when adjusting, ratio according to actual brightness value and object illumination value, the light illumination of a proportional numbers form of output controls signal to current controller 30, and adjust accordingly according to this ratio controlling electric current, can make the reflection illumination (the actual brightness value detecting after adjusting) of light source be adjusted into predetermined object illumination, thus reach by collected by camera to image averaging gray scale be adjusted into the object of set point.
For example, in an example of the present invention, camera in belt steel surface detection system adopts line-scan digital camera, line frequency 30kHZ, time for exposure 25 μ s, when light source being adopted to different control electric currents, the relation of the average gray value of the image that the detected brightness value of illuminance transducer and camera calibration arrive is as shown in the table.
table 1 electric current and illumination, the test of gradation of image value
| Control current value (A) | Brightness value (Lux) | Image averaging gray value |
| 0.30 | 33 | 35 |
| 0.35 | 36 | 40 |
| 0.40 | 39 | 46 |
| 0.45 | 43 | 52 |
| 0.50 | 45 | 56 |
| 0.58 | 50 | 64 |
Control the relation of electric current and illumination as shown in Figure 5, control the relation of electric current and image averaging gray scale as shown in Figure 6.By table 1 and Fig. 5,6, can be found out, control the relation that has approximately linear between electric current, illumination and average gray, therefore, can by linear scale, control to realize to controlling the adjustment of electric current easily.Light illumination controller can utilize the chip with digital processing function to realize, such as CPU, microcontroller, digital signal processor etc.The light illumination control signal of its output can be voltage or the current signal that characterizes actual brightness value and object illumination value corresponding relation (for example ratio value).This light illumination control signal further flows to current controller 30, and current controller 30, according to this control signal, according to the corresponding relation of actual brightness value and object illumination value, carries out corresponding linear adjustment to the control electric current that flows to light source 1.Current controller 30 can adopt any suitable current control circuit.Preferably, in an embodiment of the invention, current controller is constant current source control circuit.When light illumination being carried out to linearity adjustment, can adopt general pid control algorithm to carry out, so that image averaging gray value is fast near set point.
As shown in Figure 4, be the schematic flow sheet that utilizes the method that light illumination adaptive controller of the present invention controls light illumination.Wherein, in conjunction with Fig. 1,2, at step S100, according to the target gray value of camera 2 detected image, set the object illumination value corresponding with target gray value, and this object illumination value is stored in light illumination controller 20; In step S200, utilize the illumination that 10 pairs of light sources of illuminance transducer irradiate with the surperficial back reflection light of steel 4 to detect; In step S300, utilize light illumination controller 20 to receive the actual brightness value that illuminance transducer 10 detects, and contrast output light source illumination control signal with this object illumination value; In step S400, utilize current controller 30 to receive light illumination control signal, and according to light illumination control signal, to flowing to the control electric current of this light source, adjust.
As mentioned above, illumination and gray value are linear approximate relationship, therefore, in step S100, first, according to the target gray value of detected image (i.e. the average gray of predetermined detected image), object illumination value are set.This object illumination value is detected image average gray while being target gray scale, the brightness value being detected by illuminance transducer.Illuminance transducer for reverberation luminance detection in step S200 can be one, also can be preferably a plurality of.When illuminance transducer is while being a plurality of, actual brightness value is the mean value of the illumination that detects of described a plurality of illuminance transducer.In step S300, light illumination control signal is the control signal of an actual brightness value of reaction and object illumination value proportionate relationship, it can a voltage control signal, then, in step S400, this control signal is adjusted the output current of current controller 30, because output current and illumination are approximately linear, therefore finally the brightness value of light source can be adjusted to object illumination value.
In sum, utilize light illumination adaptive controller of the present invention and method, applicable to the surface with steel under unlike material, varying environment is detected, this be because, in apparatus and method of the present invention, can be according to the surface reflection situation with steel, light illumination is carried out to self adaptation adjustment, make detection system obtain the detected image that gray scale is consistent, thereby increase image quality, improved the analysis precision of system to belt steel surface.Therefore, light illumination adaptive controller of the present invention and method, can realize accurately and effectively the surface of belt steel product in production process is detected.
Claims (6)
1. a light illumination adaptive controller, for the light illumination in belt steel surface detection system is controlled, this detection system comprises light source and camera, this camera for the image of the belt steel surface that gathers this light source and irradiate for gray analysis, it is characterized in that, this light illumination adaptive controller comprises:
Illuminance transducer, contiguous this camera of this illuminance transducer arranges, and for light source being irradiated to the illumination of belt steel surface back reflection light, detects;
Light illumination controller, this light illumination controller is connected with this illuminance transducer, the actual brightness value detecting for receiving this illuminance transducer, and contrast output light source illumination control signal with predetermined object illumination value;
Current controller, this current controller is connected with this light source with this light illumination controller respectively, for receiving this light illumination control signal, and according to this light illumination control signal, to flowing to the control electric current of this light source, adjusts.
2. light illumination adaptive controller according to claim 1, it is characterized in that, described light illumination adaptive controller comprises a plurality of described illuminance transducers, and described actual brightness value is the mean value of the illumination that detects of described a plurality of illuminance transducer.
3. light illumination adaptive controller according to claim 2, is characterized in that, described a plurality of illuminance transducers and described camera are all fixedly installed on a mounting base.
4. light illumination adaptive controller according to claim 1, is characterized in that, described current controller is constant current source control circuit.
5. utilize light illumination adaptive controller as claimed in claim 1 light illumination to be carried out to a method for adaptive control, it is characterized in that, the method comprises the steps:
Step S100, according to the target gray value of described camera calibration image, sets the object illumination value corresponding with this target gray value, and this object illumination value is stored in described light illumination controller;
Step S200, utilizes the illumination that described illuminance transducer irradiates belt steel surface back reflection light to light source to detect;
Step S300, utilizes described light illumination controller to receive the actual brightness value that this illuminance transducer detects, and contrasts output light source illumination control signal with this object illumination value;
Step S400, utilizes described current controller to receive this light illumination control signal, and according to this light illumination control signal, to flowing to the control electric current of this light source, adjusts.
6. method of light illumination being carried out to adaptive control according to claim 5, it is characterized in that, described light illumination adaptive controller comprises a plurality of described illuminance transducers, and in described step S300, described actual brightness value is the mean value of the illumination that detects of described a plurality of illuminance transducer.
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| CN104915716A (en) * | 2014-03-14 | 2015-09-16 | 宝山钢铁股份有限公司 | Method of uniformly optimizing illuminating LED array light source for strip steel surface detection |
| CN105651204A (en) * | 2014-11-15 | 2016-06-08 | 北京航天计量测试技术研究所 | Area array autocollimator light source control method based on digital image |
| CN106950911A (en) * | 2017-04-06 | 2017-07-14 | 华南理工大学 | A kind of hot-forming real-time control apparatus of macroscopical photoinduction microarray and method |
| CN107292931A (en) * | 2016-03-30 | 2017-10-24 | 宝山钢铁股份有限公司 | The line scan camera detected for strip surface, which is turned back, is imaged calibration system and method |
| CN108827184A (en) * | 2018-04-28 | 2018-11-16 | 南京航空航天大学 | A kind of structure light self-adaptation three-dimensional measurement method based on camera response curve |
| WO2019184037A1 (en) * | 2018-03-30 | 2019-10-03 | 广州市雅江光电设备有限公司 | Led dimming method, apparatus and device, and storage medium |
| CN110384470A (en) * | 2019-07-22 | 2019-10-29 | 深圳开立生物医疗科技股份有限公司 | A kind of light-dimming method of endoscope illuminator, device, light source assembly and endoscope |
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| CN108827184A (en) * | 2018-04-28 | 2018-11-16 | 南京航空航天大学 | A kind of structure light self-adaptation three-dimensional measurement method based on camera response curve |
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| CN110384470A (en) * | 2019-07-22 | 2019-10-29 | 深圳开立生物医疗科技股份有限公司 | A kind of light-dimming method of endoscope illuminator, device, light source assembly and endoscope |
| CN117148900A (en) * | 2023-10-27 | 2023-12-01 | 济南泰格电子技术有限公司 | Environment safety management method and device for archive |
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