CN103841726A - Luminance real-time adjusting device of light source in pole piece surface defect detection and adjusting method thereof - Google Patents
Luminance real-time adjusting device of light source in pole piece surface defect detection and adjusting method thereof Download PDFInfo
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- CN103841726A CN103841726A CN201410080049.2A CN201410080049A CN103841726A CN 103841726 A CN103841726 A CN 103841726A CN 201410080049 A CN201410080049 A CN 201410080049A CN 103841726 A CN103841726 A CN 103841726A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The invention discloses a luminance real-time adjusting device of a light source in pole piece surface defect detection and an adjusting method thereof. The luminance real-time adjusting device comprises an LED light source, a contrast color swatch, an image collecting device and a light source constant-current driver. The light source luminance real-time adjusting device based on close loop control enables the light source to be capable of being adjusted in luminance in real time according to the joint function of light of outside environments and the light source on the contrast color swatch so as to enable a detected pole piece to be adjusted in an optimized illumination state, and the quality of images is ensured.
Description
Technical field
The present invention relates to the online detection field of industrial products, be specifically a kind of for lithium battery pole slice surface defects detection system the real-time adjusting device of light-source brightness and the method for adjustment thereof based on closed-loop control, this light supply apparatus is according to adjusting in real time light source intensity with the illumination on the contrast colour atla surface of tested pole piece in same surveyed area, make tested pole piece in testing process all the time in optimal illumination state.
Background technology
In recent years, vision detection system, because of advantages such as it are simple in structure, speed fast, scene is easy for installation, meets the demand of modern manufacturing industry well, has become the most rising current a kind of technology in the online context of detection of industrial products.Pole piece surface defects detection system is processed and is analyzed by the pole piece image that vision detection system is obtained, and realizes the surface defects detection of pole piece.Determine the quality of the tested pole piece image of system acquisition as the light source of vision detection system, thereby directly affecting the precision of detection system.Conventional light source is all, according to testing staff, the subjective judgement of tested pole piece picture quality is adjusted to light intensity at present, although the method can improve the precision of detection system to a certain extent, but be subject to the impact of operating personnel's subjective judgement, and can not carry out real-time light intensity adjustment.In order to overcome the above problems, be necessary to study a kind of stability high, be not subject to industrial environment influence of light, can adjust in real time the light-source system of light intensity.
In No. 201110252865.3 patents " machine vision light source brightness method of real-time adjustment and dedicated system thereof in Quality Detection ", propose computer according to the image of checked object, make light-source brightness keep constant by adjusting the operating current of light source controller.This patent adopts constant flow regulation, guarantees that light-source brightness keeps constant in the course of the work, but has ignored the impact of industrial environment light.Patent CN 201145154 Y have proposed a kind of self adaptation illuminating light source device based on Vision Builder for Automated Inspection characteristic model.Determine picture quality is contributed to maximum Illuminant chromaticity index and irradiance requirement according to checked object gradation of image standard deviation function S and image variance function V, color RGB component and the light source intensity component of determining perfect light source model, finally send data to LED light source intelligent driver by communication bus.The weak point of this design is this invention structure algorithm complexity, and in the time that checked object surface characteristics changes, the light source intensity component of controlling thus is also difficult to guarantee picture quality.
Summary of the invention
In order to overcome the defect of prior art, provide a kind of light-source brightness based on closed-loop control real-time adjusting device, make the light source acting in conjunction active adjustment light intensity to contrast colour atla according to external environment light and light source in real time, thereby make tested pole piece adjust to optimal illumination state, guarantee the quality of image.
For realizing above-mentioned technical purpose, the technical scheme adopting is: the real-time adjusting device of light-source brightness in pole piece surface defects detection, mainly comprise,
LED light source, for tested pole piece and contrast colour atla provide light source.
Light source constant-flow driver, is connected with LED light source, and to LED light source power supply, controls the brightness of LED light source.
Contrast colour atla, consistent or close with the color value of tested pole piece, and under same ambient lighting, be positioned at the monitored area of smart camera.
Image collecting device, the image of tested pole piece and contrast colour atla in Real-time Obtaining monitored area, image to tested pole piece and contrast colour atla carries out analyzing and processing, and according to the change of the analysis result control light source constant-flow driver output current of contrastive colours card graphic, until the image of tested pole piece reaches optimum efficiency, realize closed-loop control.
Image collector of the present invention is set to smart camera.
Smart camera of the present invention comprises the light source intensity control module that is arranged on cmos image acquisition module, the DSP image processing being connected with cmos image acquisition module and the analysis module of LED light source top, joins with the processing of DSP image and analysis module output.The output of light source intensity control module connects light source constant-flow driver input, adjusts the output current of light source constant-flow driver.
Contrast colour atla of the present invention is monochromatic grey level histogram.
The method of adjustment of the real-time adjusting device of light-source brightness in pole piece surface defects detection:
Step 1, optimum state when detected according to tested pole piece, demarcate the optimal brightness value A of contrastive colours card graphic;
Step 3, the cmos image acquisition module of smart camera obtains the tested pole piece under LED light source irradiation and contrasts the image of colour atla, the DSP image of smart camera inside is processed and analysis module is processed gathered contrastive colours card graphic, the brightness value of contrastive colours card graphic is analyzed with the optimal brightness value A demarcating, and give light source intensity control module by analysis result, light source intensity control module is sent instruction according to analysis result to light source constant-flow driver, adjust the output current of light source constant-flow driver, until tested pole piece and contrastive colours card graphic reach the optimum state recording in cmos image acquisition module,
Step 4, in the time that external environment light source changes, smart camera monitors the brightness value of contrastive colours card graphic and optimal brightness value A when inconsistent, repeating step three, until the brightness value of the contrast colour atla being obtained by CMOS acquisition module reaches optimal brightness A, realize closed-loop control, thereby make pole piece blemish vision detection system to adjust in real time light-source brightness according to the variation of extraneous light intensity, overcome the impact of external environment light, guarantee the quality of tested pole piece image.
Optimum state of the present invention is under LED light source irradiates, the clear state presenting of blemish in the tested pole piece image that cmos image acquisition module collects, and the gray value of the contrastive colours card graphic under this state is optimal brightness value A.
The invention has the beneficial effects as follows:
1, according to the picture quality of contrast colour atla, adjust in real time light source intensity based on closed-loop control, overcome the impact that industrial environment brightness changes, guaranteed the precision of vision detection system; According to the comparing result of contrast colour atla brightness value, by light source intensity control module, light source constant-flow driver is sent to control signal in real time, adjust light source intensity, to reach optimum efficiency.
2, contrast colour atla and tested pole piece are arranged in same surveyed area, determine the optimum detection state of corresponding tested pole piece by contrast colour atla, and not affected by the blemish of tested pole piece; This device is affected by tested pole piece neither, does not affect again accuracy of detection, implements effectively simple.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the flow chart of the inventive method.
Embodiment
Below in conjunction with embodiment, the real-time adjusting device of light-source brightness and method of adjustment thereof in pole piece surface defects detection of the present invention are described further.
LED light source comprises one group of highlighted LED, pcb board and shell, and LED is welded on pcb board, and is assemblied in shell, and there is optically focused prism PCB outside.
Light source intensity control module 8 is realized by light source intensity control circuit.
Described contrast colour atla is monochromatic grey level histogram, this card gray value and tested pole piece color approximate and with tested pole piece under same light source irradiation.In the time that brightness changes, the contrastive colours card graphic that camera collects is synchronizeed and is changed with the gray value of tested pole piece image, contrasts colour atla brightness variation and can fully reflect that tested pole piece surface brightness changes.
System needed to demarcate in advance optimal brightness value A before using, and A value is determined by tested pole piece optimum state.Calibration process is as follows: determine tested pole piece optimum state through testing, described optimum state is the clearest state presenting of tested pole piece blemish; Under this state, the gray value of contrastive colours card graphic is optimal brightness value A.
Be illustrated in figure 1 a kind of structural representation of the present invention.As shown in Figure 1, the present invention includes light source constant-flow driver 1, LED light source 2, tested pole piece 3, contrast colour atla 4 and smart camera 5.Smart camera 5 is made up of cmos image acquisition module 6, the processing of DSP image and analysis module 7 and light source intensity control module 8 again.
The cmos image acquisition module 6 of smart camera 5 is connected with contrast colour atla 4 with tested pole piece 3, for the image of the tested pole piece 3 of Real-time Obtaining and contrast colour atla 4; DSP image is processed and analysis module 7 is processed and analyzed the image of gathered contrast colour atla 4, and its brightness value is compared with the optimal brightness value A demarcating in advance; Light source intensity control module 8 is sent instruction according to comparative result to light source constant-flow driver 1, the drive current of light source constant-flow driver 1 active accommodation LED light source 2; Till the brightness value that repeats to be adjusted to contrast colour atla 4 is optimal brightness value A.Now, tested pole piece 3 images are in optimum state.
In pole piece surface defects detection of the present invention, light-source brightness method of real-time adjustment is as follows: mainly comprise following step:
(1) optimum state during according to tested pole piece detected, demarcates the optimal brightness value A of contrastive colours card graphic;
(2) provide operating current by light source constant-flow driver 1 to LED light source 2.LED light source 2 irradiates tested pole piece 3 and contrast colour atla 4.
(3) the cmos image acquisition module 6 of smart camera 5 obtains the tested pole piece 3 and the image that contrasts colour atla 4 under LED light source 2 irradiations.The DSP image of smart camera 5 is processed and analysis module 7 is analyzed the image of gathered contrast colour atla 4, according to the contrast brightness value of colour atla 4 and the difference of optimal brightness value A, is controlled the drive current of light source constant-flow driver 1 by light source intensity control module 8.Aforesaid operations process in repeating step three, until the brightness value of the contrast colour atla 4 being obtained by cmos image acquisition module 6 reaches optimal brightness A, now tested pole piece image is in optimum state.Thereby make pole piece blemish vision detection system to adjust in real time light-source brightness according to the variation of extraneous light intensity, overcome the impact of external environment light, guarantee the quality of tested pole piece image.
Whole method of adjustment is refined as to following step:
Step S1: the clearest state presenting of tested pole piece 3 blemish is determined in experiment, and the contrast colour atla 4 gradation of image values of demarcating under this state are optimal brightness value A;
Step S2: provide operating current to LED light source 2 by light source constant-flow driver 1.LED light source 2 irradiates tested pole piece 3 and contrast colour atla 4.
Step S3: the cmos image acquisition module 6 of smart camera 5 obtains the tested pole piece 3 under LED light source 2 irradiations and contrasts the image of colour atla 4, the brightness value of Real-time Obtaining contrast colour atla 4.
Step S4:DSP image process and point plate module 7 by step S3, contrast in the brightness value of colour atla 4 and step S1, demarcate optimal brightness value A compare, the brightness value collecting if current is less than optimal brightness value A, need to strengthen light source drive current; Otherwise if the brightness value collecting current is greater than optimal brightness value A, need to reduce light source drive current, and this analysis result is delivered to light source intensity control module 8.
Step S5: light source intensity control module 8 is sent the instruction of light intensity current drives according to the analysis result of step S4 to light source constant-current controller 1.
Step S6: light source constant-flow driver 1 regulates light source drive current accordingly according to the instruction of step S5.
Step S7: repeating step S3 ~ S6, until the brightness value of contrast colour atla 4 is optimal brightness value A, thereby guarantees that tested pole piece image is in optimum state.
Claims (6)
1. the real-time adjusting device of light-source brightness in pole piece surface defects detection, is characterized in that: comprises,
LED light source, for tested pole piece and contrast colour atla provide light source;
Light source constant-flow driver, is connected with LED light source, and to LED light source power supply, controls the brightness of LED light source;
Contrast colour atla, consistent or close with the color value of tested pole piece, and under same ambient lighting, be positioned at the monitored area of smart camera;
Image collecting device, the image of tested pole piece and contrast colour atla in Real-time Obtaining monitored area, image to tested pole piece and contrast colour atla carries out analyzing and processing, and according to the change of the analysis result control light source constant-flow driver output current of contrastive colours card graphic, until the image of tested pole piece reaches optimum efficiency, realize closed-loop control.
2. the real-time adjusting device of light-source brightness in pole piece surface defects detection as claimed in claim 1, is characterized in that: described image collector is set to smart camera.
3. the real-time adjusting device of light-source brightness in pole piece surface defects detection as claimed in claim 1, it is characterized in that: described smart camera comprises the light source intensity control module that is arranged on cmos image acquisition module, the DSP image processing being connected with cmos image acquisition module and the analysis module of LED light source top, joins with the processing of DSP image and analysis module output, the output of light source intensity control module connects light source constant-flow driver input, adjusts the output current of light source constant-flow driver.
4. the real-time adjusting device of light-source brightness in pole piece surface defects detection as claimed in claim 1, is characterized in that: described contrast colour atla is monochromatic grey level histogram.
5. the method for adjustment of the real-time adjusting device of light-source brightness in pole piece surface defects detection as claimed in claim 1, is characterized in that:
Step 1, optimum state when detected according to tested pole piece, demarcate the optimal brightness value A of contrastive colours card graphic;
Step 2, provide operating current by light source constant-flow driver for LED light source, LED light source irradiates tested pole piece and contrast colour atla;
Step 3, the cmos image acquisition module of smart camera obtains the tested pole piece under LED light source irradiation and contrasts the image of colour atla, the DSP image of smart camera inside is processed and analysis module is processed gathered contrastive colours card graphic, the brightness value of contrastive colours card graphic is analyzed with the optimal brightness value A demarcating, and give light source intensity control module by analysis result, light source intensity control module is sent instruction according to analysis result to light source constant-flow driver, adjust the output current of light source constant-flow driver, until tested pole piece and contrastive colours card graphic reach the optimum state recording in cmos image acquisition module,
Step 4, in the time that external environment light source changes, smart camera monitors the brightness value of contrastive colours card graphic and optimal brightness value A when inconsistent, repeating step three, until the brightness value of the contrast colour atla being obtained by CMOS acquisition module reaches optimal brightness A, realizes closed-loop control.
6. the method for adjustment of the real-time adjusting device of light-source brightness in pole piece surface defects detection as claimed in claim 5, it is characterized in that: described optimum state is under irradiating at LED light source, the clear state presenting of blemish in the tested pole piece image that cmos image acquisition module collects, the gray value of the contrastive colours card graphic under this state is optimal brightness value A.
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| CN104677221A (en) * | 2015-03-16 | 2015-06-03 | 河海大学常州校区 | Intelligent measuring tape based on CMOS imaging sensor and measuring method of intelligent measuring tape |
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| CN107413674A (en) * | 2017-06-08 | 2017-12-01 | 北京农业信息技术研究中心 | A kind of crop seed on-line sorting method and system |
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| CN115175414A (en) * | 2022-05-27 | 2022-10-11 | 广州市易鸿智能装备有限公司 | Light source brightness adaptive control system and method for lithium battery pole piece coating detection |
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