CN104034516A - Machine vision based LED detection device and detection method thereof - Google Patents
Machine vision based LED detection device and detection method thereof Download PDFInfo
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- CN104034516A CN104034516A CN201410283584.8A CN201410283584A CN104034516A CN 104034516 A CN104034516 A CN 104034516A CN 201410283584 A CN201410283584 A CN 201410283584A CN 104034516 A CN104034516 A CN 104034516A
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Abstract
The invention relates to the technical field of machine vision, in particular to a machine vision based LED detection device and a detection method thereof. The LED detection device comprises a carrier plate clamp, a camera obscura and an industrial personal computer, an industrial camera connected with the industrial personal computer is arranged in the camera obscura, a prime lens is arranged on the industrial camera, a condensation plate disposed at the front end of the prime lens is further arranged in the camera obscura, at least two positioning lamps are arranged on a plane of the condensation plate, through holes are formed in a coordinate system plane formed by the positioning plates, and the carrier plate clamp is connected with the through holes through a conduction fiber. The machine vision based LED detection device can detect LEDs quickly, efficiently and stably with low cost, and is applicable to any application environment needing to detect a large quantity of printed circuit board LEDs; the detection method can quickly and efficiently complete detection of dozens of LEDs, and is simple, convenient and rapid to operate.
Description
Technical field
The present invention relates to machine vision technique field, more specifically, relate to a kind of LED pick-up unit and detection method thereof based on machine vision.
Background technology
Machine vision, as the term suggests be exactly to make machine there is the visual performance as people, thus realize the functions such as various detections, judgement, identification, measurement.Vision Builder for Automated Inspection is generally comprised of video camera, image pick-up card, computing machine, light source etc., and its principle of work is: under certain illumination condition, with video camera, the target image that is ingested of three-dimensional scenic is collected to computer-internal formation original image; Then, use image processing techniques to carry out pre-service to improve picture quality to original image, partition graph, extracts characteristic element, forms the description to image; Finally, adopt mode identification technology to carry out tagsort, and according to pre-conditioned Output rusults.
That machine vision has is contactless with the object being observed, objective to subject not damaged, observation process, differentiate the high feature of result reliability; Simultaneously machine vision has been widened human vision scope, occasion that cannot perception in many human visions, and as the perception of high-risk scene under industrial environment etc., machine vision has more advantage; And machine vision can quick obtaining bulk information, be easy to automatic processing, be also easy to realize information integrated, be the basic technology that realizes computer integrated manufacturing system.
The existing LED checkout equipment based on machine vision generally has two kinds, and a kind of is to use color sensor to detect, as spectroscope; Another kind is to detect by measuring LED conduction voltage drop.But the cost that utilizes sensor to detect is high, do not support many LED to detect simultaneously, there is the shortcomings such as detection efficiency is low, thisly utilize approach that sensor detects to be generally applicable to laboratory test, be not suitable for the high volume applications of production line; And the mode detecting by LED conduction voltage drop is a kind of indirect measurement approach, can not really measure the characteristic feature of LED, as color, brightness etc.
Summary of the invention
The present invention is intended to solve the problems of the technologies described above at least to a certain extent.
Primary and foremost purpose of the present invention is to provide a kind of LED pick-up unit based on machine vision, and this device can complete with lower cost and rapidly and efficiently stably detect LED, and is applicable to the applied environment of a large amount of detection circuitry plate of any needs LED.
A further object of the present invention is to provide a kind of detection method that adopts the above-mentioned LED pick-up unit based on machine vision, uses the method can complete quickly and efficiently the detection of dozens of LED simultaneously, simple, convenient quick.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
A kind of LED pick-up unit based on machine vision is provided, comprise for placing support plate fixture, camera bellows and the industrial computer of LED to be measured, in described camera bellows, be provided with the industrial camera being connected with described industrial computer, described industrial camera is provided with tight shot, in described camera bellows, be also provided with the solar panel that is placed in described tight shot front end, in described solar panel plane, be provided with at least two positioning lamps, in the coordinate system plane consisting of described positioning lamp, through hole is set, described support plate fixture is connected with described through hole by conduction optical fiber.
Further, described solar panel plane is provided with three positioning lamps that color is different, and these three positioning lamps are arranged in respectively on any three angles in four angles of described solar panel plane.The accuracy direct relation of positioning lamp the location recognition of LED to be measured.
Preferably, described three positioning lamps are chosen respectively three kinds of colors of red, green, blue, to can identify by the principle of three primary colours position coordinates of described three colored positioning lamps during follow-up use.
Preferably, described through hole is provided with several, and described in several, through hole forms matrix form through hole.Through hole is except adopting the layout of matrix form, can also adopt linear placement, but in order to reach preferably effect, adopt the design of matrix form through hole, can effectively utilize the sensor area of industrial camera, also facilitate the design of location algorithm, and reduced the accuracy requirement to positioning lamp, thereby reached better stability.
Further, described support plate fixture is provided with fixture connection interface, and described fixture connection interface is provided with fiber optic conduction module, and one end of described conduction optical fiber is connected with described fiber optic conduction module, the other end is connected with described through hole.
The present invention also provides a kind of detection method adopting as the above-mentioned LED pick-up unit based on machine vision, comprises the following steps:
S1. LED to be measured light luminous, by conduction optical fiber LED light is conducted on the solar panel in camera bellows;
S2. industrial camera gathers the original image on solar panel and reaches industrial computer by PCI-Express;
S3. described industrial computer carries out pre-service to the original image collecting, and first identifies positioning lamp;
S4. described industrial computer calculates area-of-interest after obtaining positioning lamp, and this region is mapped on original image, further identifies the position coordinates of positioning lamp;
S5. by the position coordinates of step S4, adjust image direction, redraw coordinate system, and be according to further identifying other LED to be measured with this coordinate;
S6. according to the M*N matrix template designing in advance, by the coordinate system of step S5, calculate the coordinate position of each LED in matrix, and determine its area-of-interest according to the coordinate position of each LED;
S7. each area-of-interest step S6 being obtained is mapped on original image, by the composition of analyzing one by one in single region, identifies the LED eigenwert in single region;
S8. the LED eigenwert of obtaining according to default criterion and step S7 contrasts, as be unanimously considered as by, otherwise be considered as bad;
If be S9. judged to badly by step S8, described industrial computer is preserved bad original image for failure analysis foundation.
Wherein, the positioning lamp in described step S3 is the colored positioning lamp that three colors are respectively red, green, blue; In described step S4, by the principle of three primary colours, identify the position coordinates of described three colored positioning lamps.
Compared with prior art, the invention has the beneficial effects as follows:
(1) cost is low.The LED pick-up unit that the present invention is based on machine vision is concentrated photographic subjects by conduction optical fiber and solar panel, effectively reduce visual field area, thereby do not need the equipment such as high high pixel camera, wide-angle lens and adjusting triangle support just can realize the accurate detection of super large quantity LED; The applicability that has improved device, is not subject to the impact of the layout of LED to be measured own simultaneously yet.
(2) detect high-level efficiency.The LED pick-up unit that the present invention is based on machine vision can complete the detection of the performances such as the color of tens of LEDs and brightness simultaneously, and the time of using only needs several seconds.
(3) stability is high.The LED pick-up unit that the present invention is based on machine vision is accurately identified LED lamp by three look positioning lamps, reduces widely because the reasons such as camera lens rocks, becomes flexible cause camera to lose the fault of focus, and the stability of this device is promoted greatly.
(4) applied widely.The LED pick-up unit that the present invention is based on machine vision only needs suitably to change support plate fixture, can on same device, complete the test of the LED product of more than ten different model, and other all parts are shared to save cost.
(5) volume is little, modularization.The LED pick-up unit that the present invention is based on machine vision both can independent utility, also can be integrated in other automatization test systems.
(6) the present invention adopts the detection method of the above-mentioned LED pick-up unit based on machine vision, simple to operate, convenient and swift, can complete quickly and efficiently the detection of dozens of LED simultaneously.
Accompanying drawing explanation
Fig. 1 is the structural representation of the LED pick-up unit of embodiment mono-based on machine vision.
Fig. 2 is the solar panel planar structure schematic diagram of the LED pick-up unit of embodiment mono-based on machine vision.
Fig. 3 is the X-Y plane coordinate system that mono-or three positioning lamps of embodiment form.
Embodiment
Below in conjunction with embodiment, the present invention is further illustrated.Wherein, accompanying drawing is only for exemplary illustration, expression be only schematic diagram, but not pictorial diagram can not be interpreted as the restriction to this patent; For embodiments of the invention are described better, some parts of accompanying drawing have omission, zoom in or out, and do not represent the size of actual product; For a person skilled in the art, in accompanying drawing some known configurations and explanation thereof may to omit be understandable.
The corresponding same or analogous parts of same or analogous label in the accompanying drawing of the embodiment of the present invention; In description of the invention, it will be appreciated that, if have term " on ", the orientation of the indication such as D score, " left side ", " right side " or position relationship be for based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, rather than indicate or imply that the device of indication or element must have specific orientation, with specific orientation, construct and operation, therefore the term of describing position relationship in accompanying drawing, only for exemplary illustration, can not be interpreted as the restriction to this patent.
And above-mentioned part term is except can be for representing orientation or position relationship, also may be for representing other implications, for example term " on " in some cases also may be for representing certain relations of dependence or annexation.For those of ordinary skills, can understand as the case may be these terms concrete meaning in the present invention.
Embodiment mono-
As shown in Figure 1 to Figure 3 for the present invention is based on the embodiment of the LED pick-up unit of machine vision.As Fig. 1, shown in Fig. 2, this LED pick-up unit comprises for placing the support plate fixture 1 of LED to be measured, camera bellows 2 and industrial computer 3, in camera bellows 2, be provided with the industrial camera 21 being connected with industrial computer 3, industrial camera 21 is by camera support 22 fixed supports that are arranged in camera bellows 2, industrial camera 21 is provided with tight shot 23, in camera bellows 2, be also provided with the solar panel 24 that is placed in tight shot 23 front ends, in solar panel 24 planes, be provided with three positioning lamps 25 that color is different, in the coordinate system plane forming by positioning lamp 25, through hole 26 is set, support plate fixture 1 is connected with through hole 26 by conduction optical fiber 4.Wherein, be also provided with fixture connection interface 11 on support plate fixture 1, this fixture connection interface 11 is provided with fiber optic conduction module (not shown), and one end of conduction optical fiber 4 is connected with fiber optic conduction module, the other end is connected with through hole.
In the present embodiment, as shown in Figure 2, the different positioning lamp 25 of three colors in solar panel 24 planes, these three positioning lamps 25 are arranged in respectively on any three angles in four angles of solar panel 24 plane.The accuracy direct relation of positioning lamp the location recognition of LED to be measured.As shown in Figure 3, three positioning lamps form an X-Y plane coordinate system, are divided into according to this some matrixes in plane, the position of the corresponding LED of each matrix unit, the i.e. position of node in figure.
During for the ease of follow-up use, can identify by the principle of three primary colours position coordinates of three colored positioning lamps, three positioning lamps 25 of the present embodiment are chosen respectively three kinds of colors of red, green, blue.
In addition, the through hole arranging in the coordinate system plane consisting of three positioning lamps 25 has several, and these several through holes form matrix form through hole.Be understandable that, these through holes are except adopting the layout of matrix form, can also adopt linear placement, but in order to reach preferably effect, the present embodiment adopts the design of matrix form through hole, can effectively utilize the sensor area of industrial camera, has also facilitated the design of location algorithm, and reduced the accuracy requirement to positioning lamp, thereby reach better stability.
The size multiselect of the support plate fixture 1 of the present embodiment, replaceable.When detecting the LED of different model, only need suitably to change support plate fixture, can on same device, complete the test of the LED product of more than ten different model, other all parts are shared to save cost.
Embodiment bis-
The present invention, for adopting the embodiment of the detection method of the above-mentioned LED pick-up unit based on machine vision, comprises the following steps:
S1. LED to be measured light luminous, by conduction optical fiber LED light is conducted on the solar panel in camera bellows;
S2. industrial camera gathers the original image on solar panel and reaches industrial computer by PCI-Express;
S3. described industrial computer carries out pre-service to the original image collecting, and first identifies the colored positioning lamp that three colors are respectively red, green, blue;
S4. described industrial computer calculates area-of-interest after obtaining positioning lamp, and this region is mapped on original image, further by the principle of three primary colours, identifies the position coordinates of three colored positioning lamps; After positioning lamp is identified, its absolute position is known, so-called absolute position, the position of obtaining with respect to original photo.
S5. by the position coordinates of step S4, adjust image direction, redraw coordinate system, this coordinate system is the X-Y coordinate system building according to the absolute position of positioning lamp, and is according to further other LED to be measured of identification with this coordinate; In addition, the present embodiment adopts the mode of optical fiber insulate conduction, has avoided influencing each other of test between each LED.
S6. according to the M*N matrix template designing in advance, by the coordinate system of step S5, calculate the coordinate position of each LED in matrix, and determine its area-of-interest according to the coordinate position of each LED; Be understandable that, M*N matrix template is mainly to design according to the quantity of LED to be measured, and it comprises size and the relative position of each LED in matrix of planning matrix in advance.
S7. each area-of-interest step S6 being obtained is mapped on original image, by the composition of analyzing one by one in single region, identifies the LED eigenwert in single region; Be specially the rgb value of LED is compared.
S8. the LED eigenwert of obtaining according to default criterion and step S7 contrasts, as be unanimously considered as by, otherwise be considered as bad;
If be S9. judged to badly by step S8, described industrial computer is preserved bad original image for failure analysis foundation.
In step S6, generally according to the quantity of LED to be measured, carry out design matrix template, as the present embodiment can be designed to the matrix size of 12*12, so just can support the identification of maximum 144 LED; If the quantity of LED is less than 100, just can be designed to 10*10.So just can effectively make full use of the sensor area of industrial camera.
In compute matrix, during the coordinate position of LED, basic principle is as follows, and take 12*12 matrix, 1,300,000 pixel industrial cameras is example.The valid pixel of 1300000 pixels is 1280*960, and in this device, available maximum pixel is 960*960, wherein removes positioning lamp again and stays white region, can use 580*580 elemental area for the layout of LED to be measured.Like this, each LED can take 48*48 elemental area.If the initial point of X-Y coordinate system of take is (0,0), the coordinate of LED is followed successively by (N*24+24, M*24+24).
Adopt the detection efficiency of the present embodiment detection method high, through test, use said apparatus and adopt this detection method to detect, complete the detection of color and the brightness characteristics of 60 plurality of LEDs simultaneously, only need the time of 2 ~ 3 seconds.
Obviously, the above embodiment of the present invention is only for example of the present invention is clearly described, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without also giving all embodiments.All any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in the protection domain of the claims in the present invention.
Claims (8)
1. the LED pick-up unit based on machine vision, comprise for placing support plate fixture, camera bellows and the industrial computer of LED to be measured, in described camera bellows, be provided with the industrial camera being connected with described industrial computer, it is characterized in that, described industrial camera is provided with tight shot, in described camera bellows, be also provided with the solar panel that is placed in described tight shot front end, in described solar panel plane, be provided with at least two positioning lamps, in the coordinate system plane consisting of described positioning lamp, through hole is set, described support plate fixture is connected with described through hole by conduction optical fiber.
2. the LED pick-up unit based on machine vision according to claim 1, is characterized in that, described solar panel plane is provided with three positioning lamps that color is different, and these three positioning lamps are arranged in respectively on any three angles in four angles of described solar panel plane.
3. the LED pick-up unit based on machine vision according to claim 2, is characterized in that, described three positioning lamps are chosen respectively three kinds of colors of red, green, blue.
4. the LED pick-up unit based on machine vision according to claim 1, is characterized in that, described through hole is provided with several, and described in several, through hole forms matrix form through hole.
5. the LED pick-up unit based on machine vision according to claim 1, it is characterized in that, described support plate fixture is provided with fixture connection interface, described fixture connection interface is provided with fiber optic conduction module, and one end of described conduction optical fiber is connected with described fiber optic conduction module, the other end is connected with described through hole.
6. a detection method for employing LED pick-up unit based on machine vision as described in claim 1 to 5 any one, is characterized in that, comprises the following steps:
S1. LED to be measured light luminous, by conduction optical fiber LED light is conducted on the solar panel in camera bellows;
S2. industrial camera gathers the original image on solar panel and reaches industrial computer;
S3. described industrial computer carries out pre-service to the original image collecting, and first identifies positioning lamp;
S4. described industrial computer calculates area-of-interest after obtaining positioning lamp, and this region is mapped on original image, further identifies the position coordinates of positioning lamp;
S5. by the position coordinates of step S4, adjust image direction, redraw coordinate system, and be according to further identifying other LED to be measured with this coordinate;
S6. according to the M*N matrix template designing in advance, by the coordinate system of step S5, calculate the coordinate position of each LED in matrix, and determine its area-of-interest according to the coordinate position of each LED;
S7. each area-of-interest step S6 being obtained is mapped on original image, by the composition of analyzing one by one in single region, identifies the LED eigenwert in single region;
S8. the LED eigenwert of obtaining according to default criterion and step S7 contrasts, as be unanimously considered as by, otherwise be considered as bad;
If be S9. judged to badly by step S8, described industrial computer is preserved bad original image for failure analysis foundation.
7. detection method according to claim 6, is characterized in that, the positioning lamp in described step S3 is the colored positioning lamp that three colors are respectively red, green, blue.
8. detection method according to claim 7, is characterized in that, in described step S4, identifies the position coordinates of described three colored positioning lamps by the principle of three primary colours.
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