CN101833659A - Illumination and image processing method as well as light source control device of meter character recognition system - Google Patents
Illumination and image processing method as well as light source control device of meter character recognition system Download PDFInfo
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- CN101833659A CN101833659A CN 201010164134 CN201010164134A CN101833659A CN 101833659 A CN101833659 A CN 101833659A CN 201010164134 CN201010164134 CN 201010164134 CN 201010164134 A CN201010164134 A CN 201010164134A CN 101833659 A CN101833659 A CN 101833659A
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Abstract
The invention discloses an illumination and image processing method as well as a light source control device of a meter character recognition system. The light source control device comprises a camera, an image acquisition card, a computer, an annular light source, a light source main circuit, an angle displacement execution mechanism and a drive circuit, wherein the angle displacement execution mechanism can change the annular light source, and is connected with the annular light source. An image of a target to be recognized is acquired under the condition of different illumination, filtering and binary treatment are carried out on the image, a new image is synthesized according to the gray level information of the binary image, and the characters in the image are recognized by using the character recognition technology. The method has the advantages of simple structure and low cost, solves the problem that the bright speck phenomenon in automatic recognition of the conventional meter character influences the recognition effect, and improves the recognition efficiency of the meter character.
Description
Technical field
The present invention relates to a kind of illumination and image processing method and light source control device of meter character recognition system.
Background technology
The automatic identification of meter character is a kind of application of machine vision technique, often is used to systems such as automatic detection, automatic Verification.Its hardware constitutes the computing machine that generally comprises light source, video camera and image pick-up card is installed, and wherein image pick-up card and computing machine are also often replaced by the embedded system that realizes function of the same race.Automatically the course of work of identification is: adjust parameters such as the light intensity of light source and position before the system works, be identified the image of object during work by video camera and image pick-up card picked-up, by Flame Image Process in the computing machine and character recognition program characters in images discerned again.
The accuracy of character recognition is one of core index of automatic recognition system.One of approach that improves discrimination is improvement figure image intensifying or algorithm for pattern recognition, has a large amount of academic articles to announce the achievement in research of this respect in the past.But the prerequisite that these class methods can play one's part to the full is a system has collected meter character image clearly.In order to improve lighting condition, improve the quality of the image of taking the photograph, most of Vision Builder for Automated Inspection (automatic recognition system that comprises meter character) all has been equipped with special lighting source.
Light source is adjusted to the optimal illumination state two kinds of methods, a kind of be by the engineering staff according to the method that the subjective judgement of picture quality is regulated light source position and light intensity, another kind is an adaptive regulation method.For example, Chinese patent bulletin CN 100441063C (date of declaration: on Dec 3rd, 2008) disclose the illuminating light source device of the automatic adjust intensity in a kind of machine vision measuring system.According to this method, the illumination active adjustment radiation of light source light intensity that this light source shows according to measured object, thus avoid the inaccurate of people's subjective judgement.The weak point of this method is only to have considered the influence of radiation of light source light intensity to picture quality, and do not considered the influence of direction of illumination to picture quality.Because the display screen of a lot of instrument is smooth surfaces, therefore when direction of illumination was inappropriate, a certain zone of subject had a large amount of reflection rays and enters camera, causes the speck phenomenon in the image.If speck appears on certain unicursal that is identified character just, will cause system's erroneous judgement, obtain wrong recognition result.Therefore, the speck that is necessary to study in the automatic identification that overcomes meter character influences problem.
Summary of the invention
The illumination and image processing method and the light source control device that the purpose of this invention is to provide a kind of meter character recognition system influence the recognition effect problem with the speck phenomenon that solves in the automatic identification of existing meter character.
For solving the problems of the technologies described above, the present invention is achieved by the following technical solutions:
One, a kind of illumination and image processing method that is applied to the meter character automatic recognition system comprises following steps:
A) to being identified the illumination that object carries out twice or twice above different directions, under each lighting condition, gather the same image that is identified object;
B) image more than twice or twice that step a) is collected carries out filtering and binary conversion treatment respectively;
C) utilize the half-tone information of step b) gained binary image, the synthetic new image of a width of cloth;
D) utilize character in the character recognition technologies recognition image.
Two, a kind of light source control device that is applied to the meter character automatic recognition system:
Comprise video camera, image pick-up card, computing machine, annular light source and light source main circuit, it is characterized in that: also comprise the angular displacement topworks and the driving circuit thereof that can change annular light source, angular displacement topworks is connected with annular light source.
Described angular displacement topworks is the stepper motor of band driving circuit, one end of support is fixed on the video camera, the other end of support is fixed on the stepper motor, contiguous block is installed on the step motor shaft, contiguous block is connected with the annular light source side, when stepper motor rotates, can change the direction of illumination of annular light source.
Described angular displacement topworks comprises Y type frame and support, one end of Y type frame is fixed on the video camera, the other end of support is installed first electromagnet, jag two medial surfaces of Y type frame are installed second, third electromagnet respectively, first electromagnet inserts between second, third electromagnet of Y type frame jag two medial surfaces, Y type frame middle part is rotationally connected with screw and support by bearing, Y type frame end portion is affixed by coupling shaft and annular light source side, driving circuit drives the clutch of first electromagnet and second, third electromagnet, can change the direction of illumination of annular light source.
Described camera lens primary optical axis and the coaxial installation in the annular light source center of circle.
Described annular light source is the ring-type led light source.
The beneficial effect that the present invention has is:
The present invention adopts the annular light source of rotation to being identified the illumination that object carries out twice or twice above different directions, gathers the same image that is identified object under each lighting condition; The synthetic new image of a width of cloth of the information of utilizing several images to obtain; Utilize the character in the character recognition technologies recognition image.The method is simple in structure, cost is low, influences the recognition effect problem with the speck phenomenon that solves in the automatic identification of existing meter character, has improved the recognition efficiency of meter character.
Description of drawings
Fig. 1 is a structured flowchart of the present invention.
Fig. 2 is an angular displacement topworks structural representation in the embodiment of the invention 1.
Fig. 3 is an angular displacement topworks structural representation in the embodiment of the invention 2.
Fig. 4 is confined explosion's synoptic diagram of Fig. 3 rotating mechanism.
Fig. 5 is that a width of cloth right side has the meter character photo process filtering of hot spot and the image after the binaryzation
Fig. 6 is that width of cloth left side has the meter character photo process filtering of hot spot and the image after the binaryzation
Fig. 7 uses the image that obtains after the inventive method to Fig. 5 and Fig. 6
Among the figure: 1, video camera, 2, image pick-up card, 3, computing machine, 4, connect driving circuit, 5, the displacement execution architecture, 6, annular light source, 7, be identified instrument, 5-1, stepper motor, 5-2, electromagnet, 5-3, Y type frame, 5-4, electromagnet, 5-5, electromagnet, 5-6, bearing, 5-7, screw.
Embodiment
The present invention is further illustrated below in conjunction with drawings and Examples.
As shown in Figure 1, the present invention includes video camera 1, image pick-up card 2, computing machine 3, annular light source 6 and light source main circuit, it is characterized in that: also comprise the angular displacement topworks 5 and the driving circuit 4 thereof that can change annular light source 6, angular displacement topworks 5 is connected with annular light source 6.
As shown in Figure 2, described angular displacement 5 the stepper motor 5-1 of topworks for band driving circuit 4, one end of support is fixed on the video camera 1, the other end of support is fixed on the stepper motor 5-1, on the stepper motor 5-1 axle contiguous block is installed, contiguous block is connected with annular light source 6 sides, when stepper motor 5-1 rotates, can change a plurality of direction of illuminations of annular light source 6.
As Fig. 3, shown in Figure 4, described angular displacement topworks 5 comprises Y type frame 5-3 and support, the end of Y type frame 5-3 is fixed on the video camera 1, the other end of support is installed the first electromagnet 5-2, jag two medial surfaces of Y type frame 5-3 install second respectively, the 3rd electromagnet 5-4,5-5, the first electromagnet 5-2 inserts second of Y type frame 5-3 jag two medial surfaces, the 3rd electromagnet 5-4, between the 5-5, Y type frame 5-3 middle part is rotationally connected with screw 5-7 and support by bearing 5-6, Y type frame 5-3 end is affixed by coupling shaft and annular light source 6 sides, driving circuit 4 drives the first electromagnet 5-2 and second, the 3rd electromagnet 5-4, the clutch of 5-5 can change the direction of illumination of annular light source 6.
Above-mentioned three electromagnet all link to each other with driving circuit 4.Driving circuit 4 is output as three road electric currents, break-make and direction by the control output current, the second electromagnet 5-4 is inhaled mutually or the 3rd electromagnet 5-5 inhales mutually with the first electromagnet 5-2 with the first electromagnet 5-2, thereby annular light source 6 is turned on two fixed positions.
Described video camera 1 camera lens primary optical axis and the coaxial installation in annular light source 6 centers of circle.
Described annular light source 6 is the ring-type led light source.
When system moves, computing machine 3 sends order to driving circuit, control step motor 5-1 is positioned light source 6 for initial position 1, gather the 1st width of cloth image that is identified instrument by video camera 1 and image pick-up card 2 then, then control angle of motor rotation light source 6 is positioned position 2, gather the 2nd width of cloth image, this collects N width of cloth image altogether to repeat this process N.Above-mentioned image is carried out filtering, binary conversion treatment, obtain N width of cloth bianry image.With background colour and the target character look in B and the T pixel value difference representative image.For the pixel of the same coordinate representation of N width of cloth image, note has N
BThis coordinate pixel value of width of cloth image is B, and N is arranged
TThis coordinate pixel value of width of cloth image is T, the then synthetic new image of a width of cloth, and this coordinate pixel numerical value R is calculated as follows among the new figure:
At last synthetic new images is discerned.
Fig. 5 is that the right side has the meter character photo process filtering of hot spot and the image after the binaryzation, Fig. 6 is that the left side has the meter character photo process filtering of hot spot and the image after the binaryzation, utilization is discerned Fig. 5 and Fig. 6 based on the template matching algorithm of neural network, " 9 " can occur among Fig. 5 can't discern, and " 3 " among Fig. 6 are identified as the situation of " 1 " by mistake.After using the inventive method, the image that utilizes Fig. 5 and Fig. 6 to synthesize is Fig. 7, utilizes the template matching algorithm based on neural network can correctly identify meter character " 35.9 " again.
Claims (6)
1. an illumination and image processing method that is applied to the meter character automatic recognition system is characterized in that comprising following steps:
A) to being identified the illumination that object carries out twice or twice above different directions, under each lighting condition, gather the same image that is identified object;
B) image more than twice or twice that step a) is collected carries out filtering and binary conversion treatment respectively;
C) utilize the half-tone information of step b) gained binary image, the synthetic new image of a width of cloth;
D) utilize character in the character recognition technologies recognition image.
2. by a kind of light source control device that is applied to the meter character automatic recognition system of right 1 described method, comprise video camera (1), image pick-up card (2), computing machine (3), annular light source (6) and light source main circuit, it is characterized in that: also comprise the angular displacement topworks (5) and the driving circuit (4) thereof that can change annular light source (6), angular displacement topworks (5) is connected with annular light source (6).
3. a kind of light source control device that is applied to the meter character automatic recognition system according to claim 3, it is characterized in that: described angular displacement topworks (5) is the stepper motor (5-1) of band driving circuit (4), one end of support is fixed on the video camera (1), the other end of support is fixed on the stepper motor (5-1), contiguous block is installed on stepper motor (5-1) axle, contiguous block is connected with annular light source (6) side, when stepper motor (5-1) rotates, can change the direction of illumination of annular light source (6).
4. a kind of light source control device that is applied to the meter character automatic recognition system according to claim 2, it is characterized in that: described angular displacement topworks (5) comprises Y type frame (5-3) and support, one end of Y type frame (5-3) is fixed on the video camera (1), the other end of support is installed first electromagnet (5-2), jag two medial surfaces of Y type frame (5-3) install second respectively, the 3rd electromagnet (5-4,5-5), first electromagnet (5-2) inserts second of Y type frame (5-3) jag two medial surfaces, the 3rd electromagnet (5-4,5-5), Y type frame (5-3) middle part is rotationally connected with screw (5-7) and support by bearing (5-6), Y type frame (5-3) end is affixed by coupling shaft and annular light source (6) side, driving circuit (4) drives first electromagnet (5-2) and second, the 3rd electromagnet (5-4, clutch 5-5) can change the direction of illumination of annular light source (6).
5. a kind of light source control device that is applied to the meter character automatic recognition system according to claim 2 is characterized in that: described video camera (1) camera lens primary optical axis and the coaxial installation in annular light source (6) center of circle.
6. a kind of light source control device that is applied to the meter character automatic recognition system according to claim 2 is characterized in that: described annular light source (6) is the ring-type led light source.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103727507A (en) * | 2013-12-17 | 2014-04-16 | 生迪光电科技股份有限公司 | Intelligent LED lighting device and intelligent LED lighting system |
| CN109634027A (en) * | 2019-01-04 | 2019-04-16 | 广东智媒云图科技股份有限公司 | A kind of light-source brightness and the adjusting method and device of position |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101147157A (en) * | 2005-01-26 | 2008-03-19 | 数字逻辑扫描公司 | Data reader and methods for imaging targets subject to specular reflection |
| CN101150732A (en) * | 2006-09-20 | 2008-03-26 | 王锦峰 | Imaging method and device for color image shot by black and white camera |
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2010
- 2010-05-05 CN CN 201010164134 patent/CN101833659A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101147157A (en) * | 2005-01-26 | 2008-03-19 | 数字逻辑扫描公司 | Data reader and methods for imaging targets subject to specular reflection |
| CN101150732A (en) * | 2006-09-20 | 2008-03-26 | 王锦峰 | Imaging method and device for color image shot by black and white camera |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103727507A (en) * | 2013-12-17 | 2014-04-16 | 生迪光电科技股份有限公司 | Intelligent LED lighting device and intelligent LED lighting system |
| CN109634027A (en) * | 2019-01-04 | 2019-04-16 | 广东智媒云图科技股份有限公司 | A kind of light-source brightness and the adjusting method and device of position |
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Application publication date: 20100915 |