CN102340915B - Machine vision light source luminance real-time regulating method and special system thereof in quality detection - Google Patents
Machine vision light source luminance real-time regulating method and special system thereof in quality detection Download PDFInfo
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- CN102340915B CN102340915B CN201110252865.3A CN201110252865A CN102340915B CN 102340915 B CN102340915 B CN 102340915B CN 201110252865 A CN201110252865 A CN 201110252865A CN 102340915 B CN102340915 B CN 102340915B
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Abstract
The invention discloses a machine vision light source luminance real-time regulating method in quality detection, which comprises the steps of: acquiring an image of an object to be detected, transmitting the image to a computer, analyzing an RGB (Red Green Blue) value of a shot picture by using an image processing module in the computer to obtain a luminance value of a current light source, and when the luminance of the light source changes, sending a command to a constant-current controller by the computer, compensating a working current of the light source by the constant-current controller according to the command of the computer to ensure that the luminance of the light source is kept constant. The invention also discloses a special system of the method, which comprises a light source device, an intelligent constant-current controller connected with the light source device and used for providing electricity to the light source device, the image acquisition device arranged above the light source and a computer connected with the image acquisition device and the intelligent constant-current controller. The machine vision light source luminance real-time regulating method and the special device thereof have the characteristic of ensuring that the luminance of the light source is kept constant in a working process by adopting the constant-current regulation.
Description
Technical field
The present invention relates to electronic product Quality Detection technical field, is machine vision in a kind of Quality Detection specifically
Light source brightness control method and dedicated system thereof.
Background technology
In suitability for industrialized production, intelligentized Quality Detection is generally used in the whole world, and machine vision light source is the core component in this detection system.Light source is connected with a controller, and most of light sources are realized by controller regulator potentiometer (variable resistor) the control of its voltage, electric current; By regulating variable-resistance resistance value to change operating voltage, the electric current of light source, thereby can control the brightness of light source; But above control mode can not be controlled in real time, and when the brightness of light source changes, the voltage and current that controller provides can't carry out auto-compensation, and it is constant that light-source brightness can not keep.
Summary of the invention
Task of the present invention is to solve prior art problem, and a kind of machine vision light source system of brightness adjusting is in real time provided, and makes light-source brightness can keep constant.
Technological means: the invention discloses machine vision light source brightness method of real-time adjustment in a kind of Quality Detection, the method comprises:
1) LED light source is connected to the operating current source as LED light source with Intelligent constant flow controller, Intelligent constant flow controller and computer carry out exchanges data;
2) operating current of default light source, Intelligent constant flow controller is monitored the operating current of light source in real time, and when operating current generation deviation, Intelligent constant flow controller carries out current compensation automatically, light source is remained under the state of constant current and work;
3) by following measures, realize, when LED light source shines directly into detected object, obtain the image of object to be detected, and image transmitting is arrived to computer, the rgb value that utilizes image processing module in computer to analyze captured picture obtains the brightness value of current light source in real time, and when light-source brightness changes, computer sends instruction to Intelligent constant flow controller, Intelligent constant flow controller is adjusted the operating current of light source according to the instruction of computer, make light-source brightness keep constant.
The invention also discloses a kind of machine vision light source system that can adjust in real time light-source brightness for said method, this machine vision light source system comprises LED light source equipment, is connected and is the Intelligent constant flow controller of its power supply with light source, is arranged on the image capture device of light source top and the computer being connected with Intelligent constant flow controller with image capture device respectively; Wherein in computer, be provided with light source identification module and control module, light source identification module is sent instruction by control module to Intelligent constant flow controller.
The cross section of light source is annular, the collection fenestra that the centre of its ring is image capture device; Light source comprises one group of LED, pcb board and shell, and LED is welded on pcb board, and is assemblied in shell.
Image capture device is industrial camera.
Beneficial effect: the present invention utilizes image capture device to obtain the image of testing product, when detecting, light source identification module is carried out real-time sampling analysis to the rgb value of image, according to the result obtaining, by control module, intelligent controller is sent to control signal in real time, to change light source, obtain the parameter of power supply, reach the effect of brightness constancy.Because temperature can exert an influence to the work of LED lamp, so adopt electric current regulative mode, by being adjusted in real time LED lamp, input constant operating current.
Accompanying drawing explanation
Fig. 1 is the flow chart of the inventive method;
Fig. 2 is the structural representation of product of the present invention.
Embodiment
As shown in Figure 1, the invention discloses machine vision light source brightness method of real-time adjustment in a kind of Quality Detection, the method comprises:
1) LED light source is connected to the operating current source as LED light source with Intelligent constant flow controller, Intelligent constant flow controller and computer carry out exchanges data;
2) operating current of default light source, Intelligent constant flow controller is monitored the operating current of light source in real time, and when operating current generation deviation, Intelligent constant flow controller carries out current compensation automatically, light source is remained under the state of constant current and work;
3) by following measures, realize, when LED light source shines directly into detected object, obtain the image of object to be detected, and by the rgb value of the captured picture of Computer Analysis, obtain in real time the brightness value of current light source, when light-source brightness changes, computer sends instruction to constant-current controller, and constant-current controller is adjusted the operating current of light source according to the instruction of computer, makes light-source brightness keep constant.
Above-mentioned 3) can be refined as 4 steps:
Step S1: by video capture device Real-time Obtaining detected image, and the rgb value of image is analyzed to the brightness value of Real-time Obtaining light source;
Step S2: the brightness value that step S1 is obtained compares with the brightness value setting in advance;
Step S3: the result that computer obtains according to step S2 is sent instruction to Intelligent constant flow controller;
Step S4: Intelligent constant flow controller regulates supply current accordingly according to the instruction of S3, guarantees that the brightness value of light source is constant.
Be illustrated in figure 2 a kind of machine vision light source system that can adjusting luminance in real time disclosed by the invention, this system comprises light source 1, the Intelligent constant flow controller 2 that is connected and is its power supply with light source 1, the image capture device 3 that is arranged on light source top and the computer 4 being connected with Intelligent constant flow controller 2 with image capture device 3 being respectively arranged on directly over detected material 5; Wherein in computer 4, be provided with light source identification module 41 and control module 42, light source identification module 41 is sent instruction by control module 42 to Intelligent constant flow controller 2.
The cross section of light source 1 is annular, and the centre of its ring is the collection fenestra of image capture device 2; Light source comprises one group of LED bulb, pcb board and shell, and LED bulb is welded on pcb board, and is assemblied in shell; The general industrial camera that adopts of image capture device 3; Here using Intelligent constant flow controller is the rising with temperature because of LED bulb, and the just collimation of its optimum operating voltage can change, so adopt the mode of constant flow regulation more easily to reach optimum efficiency.
Claims (4)
1. a machine vision light source brightness method of real-time adjustment in Quality Detection, is characterized in that the method comprises:
1) LED light source is connected to the operating current source as LED light source with Intelligent constant flow controller, Intelligent constant flow controller and computer carry out exchanges data;
2) operating current of default light source, Intelligent constant flow controller is monitored the operating current of light source in real time, and when operating current generation deviation, Intelligent constant flow controller carries out current compensation automatically, light source is remained under the state of constant current and work;
3) by following measures, realize, when LED light source shines directly into detected object, obtain the image of object to be detected, and by the rgb value of the captured picture of Computer Analysis, obtain in real time the brightness value of current light source, when light-source brightness changes, computer sends instruction to Intelligent constant flow controller, and Intelligent constant flow controller is adjusted the operating current of light source according to the instruction of computer, make light-source brightness keep constant
Wherein step 3) comprises the following steps:
When step S1:LED light source shines directly into detected object, by video capture device Real-time Obtaining detected image, computer is analyzed the brightness value of Real-time Obtaining light source to the rgb value of image;
Step S2: the brightness value that step S1 is obtained compares with the brightness value setting in advance;
Step S3: the result that computer obtains according to step S2 is sent instruction to Intelligent constant flow controller;
Step S4: Intelligent constant flow controller regulates supply current accordingly according to the instruction of step S3, guarantees that the brightness value of light source is constant.
2. for the machine vision light source system that can adjust in real time light-source brightness for method described in claim 1, it is characterized in that: this machine vision light source system comprises LED light source equipment, is connected and is the Intelligent constant flow controller of its power supply with light source, is arranged on the image capture device of light source top and the computer being connected with Intelligent constant flow controller with image capture device respectively, in computer, be provided with light source identification module and control module, light source identification module is sent instruction by control module to Intelligent constant flow controller, wherein LED light source is for shining directly into detected object, image capture device is for Real-time Obtaining detected image, the effect of computer is the rgb value of described detected image to be analyzed to the brightness value of Real-time Obtaining light source, and the brightness value obtaining and the brightness value setting in advance are compared, then according to the result obtaining, to Intelligent constant flow controller, send instruction, the effect of Intelligent constant flow controller is to regulate accordingly supply current according to described instruction, the brightness value that guarantees light source is constant.
3. the machine vision light source system that can adjust in real time light-source brightness according to claim 2, is characterized in that: the cross section of described light source is annular, the collection fenestra that the centre of its ring is image capture device; Described light source comprises one group of LED, pcb board and shell, and LED is welded on pcb board, and is assemblied in shell.
4. according to the machine vision light source system that can adjust in real time light-source brightness described in claim 2 or 3, it is characterized in that: described image capture device is industrial camera.
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| CN110132976B (en) * | 2019-04-23 | 2022-03-25 | 合刃科技（深圳）有限公司 | Detection method and detection device |
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Address after: 523000 Second Floor, Executive Building No. 1 Minxing Road, Chang'an Town Corner Community, Dongguan City, Guangdong Province Patentee after: Dongguan Meng Tuo Intelligent Technology Co., Ltd. Address before: 523851 4th Floor, 118 Guanchang Road, Yongtou, Chang'an Town, Dongguan City, Guangdong Province Patentee before: Dongguan MENTO Photoelectric Technology Co., Ltd. |
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