CN202472608U - Signal receiver of electronic whiteboard with wide angle image detection - Google Patents
Signal receiver of electronic whiteboard with wide angle image detection Download PDFInfo
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- CN202472608U CN202472608U CN2012200279868U CN201220027986U CN202472608U CN 202472608 U CN202472608 U CN 202472608U CN 2012200279868 U CN2012200279868 U CN 2012200279868U CN 201220027986 U CN201220027986 U CN 201220027986U CN 202472608 U CN202472608 U CN 202472608U
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- convex mirror
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Abstract
The utility model discloses a signal receiver of an electronic whiteboard with wide angle image detection. The signal receiver of the electronic whiteboard with wide angle image detection mainly comprises a camera (1) and an image processing circuit (2) which are installed in a shell (6). The camera (1) is connected to the image processing circuit (2) which is provided with a computer interface. The field angle of the camera (1) is smaller than 45 degrees. A convex mirror (3) is further arranged in front of the camera (1), the convex mirror is located within a view finding range of the camera (1), and the reflective face of the convex mirror can be observed from the camera. The convex mirror can be a spherical reflector, an elliptical reflector or convex reflectors in other shapes. As the convex mirror can form a virtual image of an object behind the object and the angle of the imaging view field is decided by the shape, a virtual image of a large field angle can be formed in a condition of small area and large radius of curvature, thus, the shooting effect of a large field angle camera can be achieved by shooting the virtual image by using a small field angle camera.
Description
Technical field
The utility model relates to a kind of electronic whiteboard signal receiver that adopts the realtime graphic detection method to carry out the electronic whiteboard device, particularly a kind of big field angle of pen location.
Background technology
In current electronic whiteboard technology; Use image detection to realize that follow the tracks of the person's handwriting location is one of mainstream technology; That main cause is that this type of blank is installed and used flexibly, responded is fast, cost is low, volume is little etc.; And along with the development of sensor and digital processing technology, the development space of this series products is very big.Relevant use realtime graphic detects the electronic whiteboard technical scheme of carrying out the pen location all to be had in a large amount of patent documents and relates to; Be called the Chinese invention patent of " system and method that is used for computing machine coordinate and control information input " like patent No. ZL011080477, patent of invention publication number CN1305143A, name, and patent of invention publication number CN1928799A, be called in the Chinese invention patent application of " touch-screen locating device and localization method thereof " detailed description is arranged.Its basic functional principle is: the luminous point that produces with the light pen of active illuminating or passive catoptrical light pen (comprising finger etc.) indicates the position of impact point; Introduce camera head and gather the image of screen scope in real time; With signal processing circuit real-time analysis picture signal and extract the positional information of bright spot; Be input to computing machine through interface circuit and corresponding software, carry out the physical location that calibrating coordinates makes the Position Tracking light pen of cursor, thereby realize the interactive electronic white board function with the coordinate correction algorithm.
In this series products, present image-pickup method is that camera is directly aimed at screen and covered whole screen, but universal day by day along with short out-of-focus projection, particularly considers and avoids the needs that block, and camera need be as far as possible near screen.This has brought a problem, and the field angle that is exactly camera need be very big, for example when camera is in 80 cun screen pictures of 40cm place, front upper place collection, requires the angle of view greater than 120 degree.
At present this series products is in application, but has following problem: one, the image border decay is serious, causes edge sensitivity to descend, and causes antijamming capability to descend and improve overall sensitivity.
Two, the image border distortion is big, causes the resolution at edge to descend rapidly, causes the blank whole resolution to descend.
Three, generally this type of camera lens needs the multi-disc lens to constitute, and cost is high, and volume is big, and typical situation is a fish eye lens.
Four, according to the physical optics principle, the light-filtering characteristic of multilayer interference filter changes with angle of incidence of light is different, in order to ensure seeing through of different angles light, must increase optical filter optical transmission window width, and this causes system's antijamming capability to descend.Because this reason in the prior art, can't realize the logical optical filtering of high performance band in theory.
Summary of the invention
To the problem that exists in the prior art, the purpose of the utility model provides a kind of wide angle picture detected electrons blank signal receiver, can realize avoiding the problem that exists in above-mentioned prior art and the product under the situation that super large visual angle image receives.
To achieve these goals, the wide angle picture detected electrons blank signal receiver of the utility model mainly comprises camera 1, image processing circuit 2; They are installed in the shell 6; Said camera 1 is linked image processing circuit 2, on the image processing circuit 2 computer interface is arranged, and the field angle of said camera 1 is less than 45 degree; Before camera 1, also have convex mirror 3 or concave mirror 3 '; It is positioned at the viewfinder range of camera 1, and its reflecting surface can observe from camera, also has an infrared receiving module 7 to be connected to image processing circuit 2.Wherein convex mirror 3 or concave mirror 3 ' can be spherical reflector, ellipsoidal mirror, or the convex reflecting mirror of other shapes, its imaging angle is greater than 90 degree.Because convex mirror can form the virtual image with object thereafter; And the angle of imaging viewing field is by its shape decision; Under the situation of small size larger radius of curvature; Can form the virtual image of big field angle, therefore this virtual image taken the shooting effect that can reach big field angle camera through the camera of neglecting the rink corner.
After having adopted the scheme of the utility model, can reach such beneficial effect:
One, because the convex mirror imaging does not have the image border attenuation problem, and the small angle camera is also no problem, so brightness of image is even, from being very beneficial for improving overall sensitivity and antijamming capability.
Two, suitably the convex mirror of design can make the image border of wide-angle imaging abnormal less, helps improving systemic resolution.
Three, convex mirror and small angle camera cost are all lower, have reduced the complete machine cost.
Four, convex mirror does not have spectral effects, and small angle camera angle of incidence of light is approaching, therefore has to adopt narrow band pass filter to carry out the high-level efficiency optical filtering, can improve the system signal noise ratio several times.
According to same thinking, also can adopt concave mirror to replace above-mentioned convex mirror, be similar from optical principle, just turn upside down, do not influence through this putting upside down of common calibrating coordinates.
Description of drawings
Fig. 1 is structure and the light path synoptic diagram of an embodiment of the utility model.
Fig. 2 is structure and the light path synoptic diagram of second embodiment of the utility model.
Among the figure, camera 1, image processing circuit 2, convex mirror 3 or concave mirror 3 ', laser instrument 4, rotating shaft 5, shell 6.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is further specified.
As shown in Figure 1, the wide angle picture detected electrons blank signal receiver of present embodiment, its shell 6 is plastic housings; Camera 1 is to constitute with 1/4 inch imageing sensor and the common lens of 16mm; Its imaging visual angle is merely about 13 degree, so the brightness of image is very even, and it is minimum to distort.Camera 1 is linked image processing circuit 2, on the image processing circuit 2 computer interface is arranged, and the opposite side relative with camera 1 has convex mirror 3, and it is a spherical mirror, and being installed in one can be around the shaft on 5 cover plates that are rotated.When cover plate is shut, then both reduced volume, again camera and minute surface are protected.During use, rotation cover makes camera 1 can collect the image of screen.During use, only need adjust the cover plate elevation angle, can adjust the range of receiving of camera.On the next door of camera 1, be provided with laser instrument 4, it is a red laser diode; Be radiated at the center of range of receiving; But also can shine the center of range of receiving upper sideline or lower sideline, particularly in the application of ultra wide-angle, be radiated at the center, sideline and be of practical significance more; Because along with the increase of tilting, it is far away that the geometric center of range of receiving departs from the center of camera visual field.
Receive the elevation angle in order to adjust, convex mirror 3 can be rotated around rotating shaft 5.In addition, the laser instrument 4 of introducing is a visible light semiconductor laser; Install near camera 1; Its light beam shines the ad-hoc location of range of receiving through convex mirror 3 reflections, such as screen center or edge center position up and down, be used to indicate the scope of camera collection image.Said laser instrument 4 can have two, shines two ad-hoc locations of screen respectively, such as two inferior horns, and indicating image acquisition range so more clearly.In addition, in order to realize non-light pen Position Tracking, can also introduce illuminating infrared LED, its light is through convex mirror 3 reflections or shine directly into screen.Camera 1 has adopted the camera lens than long-focus, and its field angle is spent less than 45, even less than 10 degree.In its front or at the back bandpass filter is installed, is used to improve OSNR.
In addition, also an infrared receiving module 7 also is connected to image processing circuit 2, and infrared receiving module 7 is a kind of universal circuit modules that can receive infrared carrier signal commonly used in the common infrared remote-control device.Utilize infrared receiving module and cooperate corresponding light pen can realize many functions such as identification, perhaps realize the reception of remote signal; Utilize infrared receiving module and cooperate the imageing sensor of overall situation exposure can realize that the light pen signal receives efficiently; On this basis, can also introduce an infrared transmitting tube again, utilize infrared transmitting tube can launch the alternation infrared signal, be used for sending control and synchronizing signal, realize higher function to light pen.
Fig. 2 is structure and the light path synoptic diagram of second embodiment of the utility model.Wherein adopted concave mirror (3 ').Can see that from figure imaging is put upside down with adopting convex mirror, others are as broad as long.
Though the present invention with preferred embodiment openly as above; But embodiment and accompanying drawing are not to be used for limiting the present invention, anyly are familiar with this art, in spirit that does not break away from the present invention and scope; From when doing various variations or retouching, belong to the present invention's protection domain equally.Therefore protection scope of the present invention should with the application claim was defined is as the criterion.
Claims (10)
1. wide angle picture detected electrons blank signal receiver; It comprises camera (1) and the image processing circuit (2) that is installed in the shell (6); Said camera (1) is linked image processing circuit (2); Said image processing circuit (2) is provided with computer interface, it is characterized in that: the field angle of said camera (1) is less than 45 degree, at the preceding convex mirror (3) that also is provided with of said camera (1); Said convex mirror (3) is positioned at the viewfinder range of camera (1), also has an infrared receiving module (7) to be connected to image processing circuit (2).
2. wide angle picture detected electrons blank signal receiver according to claim 1 is characterized in that: said convex mirror (3) is installed in the rotating shaft (5), and said convex mirror (3) is through rotating around said rotating shaft (5).
3. wide angle picture detected electrons blank signal receiver according to claim 1 and 2; It is characterized in that: have one or two semiconductor visible light laser instrument (4) to be contained near the said camera (1), and its light beam irradiates is to said convex mirror (3).
4. wide angle picture detected electrons blank signal receiver according to claim 1 and 2 is characterized in that: on the light path of said camera (1), be provided with bandpass filter.
5. wide angle picture detected electrons blank signal receiver according to claim 1 and 2 is characterized in that: said convex mirror (3) is a spherical reflector, and its imaging angle is greater than 90 degree.
6. wide angle picture detected electrons blank signal receiver according to claim 1 and 2 is characterized in that: said convex mirror (3) is an ellipsoidal mirror, and its imaging angle is greater than 90 degree.
7. wide angle picture detected electrons blank signal receiver; It comprises camera (1) and the image processing circuit (2) that is installed in the shell (6); Said camera (1) is linked image processing circuit (2); Said image processing circuit (2) is provided with computer interface, it is characterized in that: the field angle of said camera (1) is less than 45 degree, at the preceding concave mirror (3 ') that also is provided with of said camera (1); Said concave mirror is positioned at the viewfinder range of camera (1), also has an infrared receiving module (7) to be connected to image processing circuit (2).
8. wide angle picture detected electrons blank signal receiver according to claim 7 is characterized in that: said concave mirror (3 ') is installed in the rotating shaft (5), and said concave mirror (3 ') is through rotating around said rotating shaft (5).
9. according to claim 7 or 8 described wide angle picture detected electrons blank signal receivers; It is characterized in that: have one or two semiconductor visible light laser instrument (4) to be contained near the said camera (1), and its light beam irradiates is to said concave mirror (3 '); On the light path of said camera (1), be provided with bandpass filter.
10. according to claim 7 or 8 described wide angle picture detected electrons blank signal receivers, it is characterized in that: said concave mirror (3 ') is a spherical reflector or ellipsoidal mirror, and its imaging angle is greater than 90 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200279868U CN202472608U (en) | 2012-01-22 | 2012-01-22 | Signal receiver of electronic whiteboard with wide angle image detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200279868U CN202472608U (en) | 2012-01-22 | 2012-01-22 | Signal receiver of electronic whiteboard with wide angle image detection |
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| Publication Number | Publication Date |
|---|---|
| CN202472608U true CN202472608U (en) | 2012-10-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012200279868U Expired - Fee Related CN202472608U (en) | 2012-01-22 | 2012-01-22 | Signal receiver of electronic whiteboard with wide angle image detection |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109255282A (en) * | 2017-07-14 | 2019-01-22 | 上海荆虹电子科技有限公司 | A kind of biometric discrimination method, device and system |
| KR102216804B1 (en) * | 2019-11-15 | 2021-02-17 | (주)이즈커뮤니케이션즈 | Apparatus for Inputting Informations to an Information Processing Device |
-
2012
- 2012-01-22 CN CN2012200279868U patent/CN202472608U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109255282A (en) * | 2017-07-14 | 2019-01-22 | 上海荆虹电子科技有限公司 | A kind of biometric discrimination method, device and system |
| CN109255282B (en) * | 2017-07-14 | 2021-01-05 | 深圳荆虹科技有限公司 | Biological identification method, device and system |
| KR102216804B1 (en) * | 2019-11-15 | 2021-02-17 | (주)이즈커뮤니케이션즈 | Apparatus for Inputting Informations to an Information Processing Device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121003 Termination date: 20160122 |
|
| EXPY | Termination of patent right or utility model |