CN202443449U - Photographic multi-point touch system - Google Patents
Photographic multi-point touch system Download PDFInfo
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- CN202443449U CN202443449U CN2012200884850U CN201220088485U CN202443449U CN 202443449 U CN202443449 U CN 202443449U CN 2012200884850 U CN2012200884850 U CN 2012200884850U CN 201220088485 U CN201220088485 U CN 201220088485U CN 202443449 U CN202443449 U CN 202443449U
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Abstract
The utility model discloses a photographic multi-point touch system, relating to the technical field of human-machine interaction. The photographic multi-point touch system is characterized by consisting of a host, a display screen, two wide-angle cameras and an image processing unit; the two wide-angle cameras are respectively arranged on positions of two corners at the same side of the display screen; the display screen respectively form a one-dimensional linear array image on two two-dimensional images which are respectively shot by the two wide-angle cameras; the image processing unit is arranged in the host and used for processing the one-dimensional linear array image in the two two-dimensional images shot by the two wide-angle cameras and calculating touch point coordinates; the image processing unit is also used for processing other two-dimensional images containing side images of a touched object, except the one-dimensional linear array, shot by the two wide-angle cameras and eliminating ghost points from the touch point coordinates to obtain the actual touch point coordinates; and the host is used for executing corresponding tasks according to the actual touch point coordinates obtained by the image processing unit. According to the photographic multi-point touch system, the ghost points can be eliminated just by using the two wide-angle cameras and side images.
Description
Technical field
The utility model relates to a kind of camera shooting type multi-point touch system, belongs to field of human-computer interaction.
Background technology
Utilize camera to realize that the system of touch function is a lot; The concrete implementation method of this type systematic is following: installation diagram image-position sensor on two angles of screen; Its visual angle that is parallel on the screen orientation is that 90 degree cover whole screen, and the visual angle on the normal to screen direction guarantees that touch objects is in the visual angle of imageing sensor.During system works; The light that screen sends forms images on imageing sensor through optical lens; What become similarly is a continuous straight-line segment, when the touch objects touch screen, has the shade of interruption in the middle of the continuous straight-line segment; Can obtain the straight-line equation of touch objects to two imageing sensor according to the physical location of relative position and the imageing sensor of shade on continuous straight-line segment, the intersection point of two straight lines is exactly the position of touch objects.
But, when or multiple spot taking place touch simultaneously, can penetrate two or n bar straight line respectively from two cameras at 2 according to above principle; Article 2, the intersection of straight line phase obtains 4 points; The intersection of n bar straight line phase obtains n * n point, wherein has only n to be called real point, and remaining is called terrible point.
A method eliminating the ghost point is for increasing the number of camera, CN201853210U " based on the plane multiple point touching control device of optical sensing " such as the refined CN102023762A of Ru Zhaoli " a kind of optics multi-point touch panel and its implementation ", Lou Sihua, the strong CN101788872A of grandson scholar " position detecting apparatus of detecting multi-point touch ", Lu such as western CN101650620A " a kind of camera type touch detection method and camera type touch detection system ", Lu such as western CN1746837A " electronic display system localization method and device thereof ", the tough CN101271372A of party " a kind of multi-point touch panel ".
Ye Xinlin CN102043500A " a kind of touch system and multipoint positioning method " also proposes to eliminate the method for ghost point: calculate all touch points with a certain locator meams as the main locator meams that touches, be aided with another kind of localization method again to eliminate terrible point.Wherein main locator meams can be resistance-type, surface capacitance type, projected capacitive, optical profile type, surface acoustic wave type, the flexural wave formula, and relevant patent also has CN102033640A and CN102033641A.
John David newton CN101971129A " solves the system and method for the multiple point touching sight of optical touch screen ", and the terrible method of putting of elimination is: set up a secondary light source; Through changing the direction of light source; By this distance of length computation of shade, eliminate terrible point according to this distance to imageing sensor.
Lu such as western CN101520700A " a kind of three-dimensional positioning touch device and localization method thereof based on the wide-angle imaging head " utilize the coordinate of object in the two dimensional image that two cameras take; The transformational relation formula of substitution three-dimensional system of coordinate and each camera image plane coordinate system is to confirm its 3 d space coordinate; Get its plane P parallel screen (x again with display screen; Y) coordinate, relation is obtained its coordinate on display screen in proportion.
The singlehanded some position that touches of distance feature difference between " based on the natural gesture Study of Recognition of multiple point touching " paper utilizations such as the Xiang of reaching the clouds finger is to eliminate terrible point.
Summary of the invention
The utility model is for overcoming there is ghost point in present camera shooting type multi-point touch system when multiple point touching is discerned problem, a kind of two cameras of use are provided but can eliminate the terrible camera shooting type multi-point touch system of putting.Said camera shooting type multi-point touch system is made up of main frame, display screen and two wide-angle imaging heads on hardware; At first utilize the touch point, one dimensional linear array location in the two dimensional image by graphics processing unit on the software; Utilize the part that comprises the touch objects side image in the two dimensional image to eliminate terrible point again, to realize multi-touch function.
The utility model technical solution problem adopts following technical scheme:
A kind of camera shooting type multi-point touch system of the utility model, its design feature is made up of main frame, display screen, two wide-angle imaging heads and graphics processing unit; Said two wide-angle imaging heads are separately positioned on two jiaos of positions of said display screen homonymy; The lens direction of two wide-angle imaging heads of adjustment is so that display screen all becomes the one dimensional linear array image on two two dimensional images that two wide-angle imaging heads are taken respectively; Said graphics processing unit is arranged in the said main frame, and the one dimensional linear array image in two two dimensional images of said two wide-angle imaging heads shooting is handled, and calculates the touch point coordinate; Other two dimensional images that comprise the touch objects side image except that one dimensional linear array that said graphics processing unit is taken two wide-angle imaging heads are handled, and from the coordinate of said touch point, eliminate terrible point, obtain the actual touch point coordinate; Said main frame is carried out corresponding task according to the actual touch point coordinate that said graphics processing unit obtains; Said display screen can be computer screen, projection screen, LCD screen, rear projection screen, links to each other with said main frame; Said two wide-angle imaging heads link to each other with said main frame through the USB mouth.
The multiple point touching locator meams of a kind of camera shooting type multi-point touch system of the utility model is: at first utilize the touch point, one dimensional linear array location in the two dimensional image; Utilize the part that comprises the touch objects side image in the two dimensional image to eliminate terrible point again, to realize multi-touch function.
As operator during with touch objects touch display screen curtain; Having the point of representing touch objects on the one dimensional linear array of the two dimensional image that said two wide-angle imaging heads are taken exists; Can calculate the straight-line equation of touch point to two a wide-angle imaging head according to the physical location of relative position and two wide-angle imaging heads of point on one dimensional linear array; Through solving equation, can obtain all touch points.When multiple point touching takes place, there is terrible point in the touch point of coming out through the one dimensional linear array image calculation.
The image that said two wide-angle imaging heads are taken is two dimensional image, when taking the one dimensional linear array image, also can photograph the side image of touch objects, utilizes in the side image characteristic of touch objects to eliminate terrible point.The characteristic of touch objects can freely define according to actual conditions in the said side image.
Compared with present technology, the utility model beneficial effect is embodied in:
1, a kind of camera shooting type multi-point touch system of the utility model only needs two wide-angle imaging heads to realize multi-touch function, need not to increase camera and can eliminate terrible point;
2, a kind of camera shooting type multi-point touch system of the utility model has made full use of the two-dimensional characteristics of the image of wide-angle imaging head shooting, realizes the location by one dimensional linear array, utilizes other parts of images to eliminate terrible point.
Description of drawings
Fig. 1 is a kind of camera shooting type multi-point touch system of the utility model structural drawing.
Fig. 2 is that the touch objects thickness is judged schematic diagram in a kind of camera shooting type multi-point touch system of the utility model side image.
Fig. 3 is touch objects thickness discriminatory analysis figure in a kind of camera shooting type multi-point touch system of the utility model side image.
Label among the figure: 1 main frame, 2 display screens, 3 wide-angle imaging heads, 4 graphics processing units.
Below pass through embodiment, and combine accompanying drawing that the utility model is described further, but the embodiment of the utility model is not limited thereto.
Embodiment
Referring to Fig. 1, a kind of camera shooting type multi-point touch system of present embodiment, its design feature is made up of main frame 1, display screen 2, two wide-angle imaging heads 3 and graphics processing unit 4.Said two wide-angle imaging heads 3 are separately positioned on two jiaos of positions of said display screen 2 homonymies; The lens direction of two wide-angle imaging heads 3 of adjustment is so that display screen 2 all becomes the one dimensional linear array image on two two dimensional images that two wide-angle imaging heads 3 are taken respectively; Said graphics processing unit 4 is arranged in the said main frame 1, and the one dimensional linear array image in two two dimensional images of said two wide-angle imaging heads, 3 shootings is handled, and calculates the touch point coordinate; Other two dimensional images that comprise the touch objects side image except that one dimensional linear array that 4 pairs of two wide-angle imaging heads of said graphics processing unit 3 are taken are handled, and from the coordinate of said touch point, eliminate terrible point, obtain the actual touch point coordinate; Said main frame 1 is carried out corresponding task according to the actual touch point coordinate that said graphics processing unit 4 obtains; Said display screen 2 can be computer screen, projection screen, LCD screen, rear projection screen, links to each other with said main frame; Said two wide-angle imaging heads 3 link to each other with said main frame 1 through the USB mouth.
The multiple point touching locator meams of a kind of camera shooting type multi-point touch system of present embodiment is: at first utilize the touch point, one dimensional linear array location in the two dimensional image; Utilize the part that comprises the touch objects side image in the two dimensional image to eliminate terrible point again, to realize multi-touch function.
As operator during with touch objects touch display screen curtain 2; Having the point of representing touch objects on the one dimensional linear array of the two dimensional image that said two wide-angle imaging heads 3 are taken exists; Can calculate the straight-line equation of touch point to two a wide-angle imaging head 3 according to the physical location of relative position and two wide-angle imaging heads 3 of point on one dimensional linear array; Through solving equation, can obtain all touch points.When multiple point touching takes place, there is terrible point in the touch point of coming out through the one dimensional linear array image calculation.
The image that said two wide-angle imaging heads 3 are taken is two dimensional image, when taking the one dimensional linear array image, also can photograph the side image of touch objects, utilizes in the side image characteristic of touch objects to eliminate terrible point.The characterizing definition of touch objects is the thickness of touch objects in the said side image.
Referring to Fig. 2; When the operator uses two touch objects when A and 2 of B locate to produce touch operation,, draw two straight lines from the wide-angle imaging head 3 in the upper left corner according to conventional way; Draw two straight lines from the wide-angle imaging head 3 in the upper right corner, totally four crossing four touch point A, B, C, D of obtaining of straight lines.In the two dimensional image that said wide-angle imaging head 3 is taken, except one dimensional linear array, also has the side image of touch objects.If the top touch objects is thin in the side image that the wide-angle imaging head in the upper left corner 3 is taken, and following touch objects is thick; The top touch objects is thin in the side image of wide-angle imaging head 3 shootings in the upper right corner simultaneously, and following touch objects is thick, then judges that according to side image A, B are the actual touch point, and C, D are terrible point; Otherwise judge that C, D are the actual touch point, and A, B are terrible point.Concrete principle is following:
Wide-angle imaging head 3 to be arranged on display screen 2 upper left corners is an example; The camera lens of adjustment wide-angle imaging head 3; Make display screen 2 on the two dimensional image that wide-angle imaging head 3 is taken, become the one dimensional linear array image, when the operator use touch objects along the direction of B ' B from upper left when move the bottom right, it is motionless representing that point of touch objects in the one dimensional linear array of the two dimensional image that wide-angle imaging head 3 is taken; But because touch objects is more and more far away from wide-angle imaging head 3, so touch objects is diminishing gradually.
When the operator with touch objects when 2 of A, B touch; On the one dimensional linear array of the two dimensional image that the wide-angle imaging head 3 in the upper left corner is taken 2 is the same with operator 2 on the one dimensional linear array of A, shooting when 2 of B ' touch; But the thickness of two touch objects is different; The touch objects of ordering at B is far away from the wide-angle imaging head 3 in the upper left corner, so the touch objects above in the side image is thin, and following touch objects wants thick.
Simultaneously; On the one dimensional linear array of the two dimensional image that the wide-angle imaging head 3 in the upper right corner is taken 2 is the same with operator 2 on the one dimensional linear array of A ', shooting when 2 of B touch; But the thickness of two touch objects is different; The touch objects of ordering at A is far away from the wide-angle imaging head 3 in the upper right corner, so the touch objects above in the side image is thin, and following touch objects wants thick.
When the operator with touch objects when 2 of C, D touch; On the one dimensional linear array of the two dimensional image that the wide-angle imaging head 3 in the upper left corner is taken 2 is the same with operator 2 on the one dimensional linear array of C, shooting when 2 of D ' touch; But the thickness of two touch objects is different; The touch objects of ordering at D is far away from the wide-angle imaging head 3 in the upper left corner, so the touch objects above in the side image is thick, and following touch objects wants thin.
Simultaneously; On the one dimensional linear array of the two dimensional image that the wide-angle imaging head 3 in the upper right corner is taken 2 with the operator at C, D " on 2 one dimensional linear array of taking when touching 2 are the same; but the thickness of two touch objects is different; the touch objects of order at D is far away from the wide-angle imaging head 3 in the upper right corner, so the touch objects above in the side image wants slightly, and following touch objects will be carefully.
Referring to Fig. 3, two straight lines intersect at 4 situation and have 9 kinds in display screen 2 planes, and wherein solid stain is represented A, B 2 points, and hollow stain is represented C, D 2 points.When every kind of situation actual touch point is 2 of A, B; Touch objects in the image of two wide-angle imaging head 3 shootings all is top thin following thick; And actual touch point is when being 2 of C, D, on one side the touch objects in the image taken of two wide-angle imaging heads 3 have at least be top thick below carefully.Characteristic in view of the above, with the thickness of touch objects as the side image characteristic to eliminate terrible point.
If true touch point is 3 or more for a long time, eliminate terrible point with other side image characteristics.
Claims (2)
1. a camera shooting type multi-point touch system is characterized in that being made up of main frame (1), display screen (2), two wide-angle imaging heads (3) and graphics processing unit (4); Said two wide-angle imaging heads (3) are separately positioned on two jiaos of positions of said display screen (2) homonymy; Adjust the lens direction of two wide-angle imaging heads (3), so that display screen (2) all becomes the one dimensional linear array image on two two dimensional images that two wide-angle imaging heads (3) are taken respectively; Said graphics processing unit (4) is arranged in the said main frame (1), and the one dimensional linear array image in two two dimensional images of said two wide-angle imaging heads (3) shooting is handled, and calculates the touch point coordinate; Other two dimensional images that comprise the touch objects side image except that one dimensional linear array that said graphics processing unit (4) is taken two wide-angle imaging heads (3) are handled, and from the coordinate of said touch point, eliminate terrible point, obtain the actual touch point coordinate; Said main frame (1) is carried out corresponding task according to the actual touch point coordinate that said graphics processing unit (4) obtains.
2. a kind of camera shooting type multi-point touch system according to claim 1 is characterized in that said display screen (2) can be computer screen, projection screen, LCD screen, rear projection screen, links to each other with said main frame (1); Said two wide-angle imaging heads (3) link to each other with said main frame (1) through the USB mouth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200884850U CN202443449U (en) | 2012-03-05 | 2012-03-05 | Photographic multi-point touch system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200884850U CN202443449U (en) | 2012-03-05 | 2012-03-05 | Photographic multi-point touch system |
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| CN202443449U true CN202443449U (en) | 2012-09-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012200884850U Withdrawn - After Issue CN202443449U (en) | 2012-03-05 | 2012-03-05 | Photographic multi-point touch system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102622140A (en) * | 2012-03-05 | 2012-08-01 | 安徽大学 | Image pick-up multi-point touch system |
| CN103731595A (en) * | 2012-10-10 | 2014-04-16 | 奥林巴斯映像株式会社 | Electronic device and driving method of the same |
| CN107765928A (en) * | 2017-04-21 | 2018-03-06 | 青岛陶知电子科技有限公司 | A kind of multi-touch display system based on graphene optical sensing technology |
-
2012
- 2012-03-05 CN CN2012200884850U patent/CN202443449U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102622140A (en) * | 2012-03-05 | 2012-08-01 | 安徽大学 | Image pick-up multi-point touch system |
| CN102622140B (en) * | 2012-03-05 | 2015-05-13 | 安徽大学 | Image pick-up multi-point touch system |
| CN103731595A (en) * | 2012-10-10 | 2014-04-16 | 奥林巴斯映像株式会社 | Electronic device and driving method of the same |
| CN103731595B (en) * | 2012-10-10 | 2017-03-01 | 奥林巴斯株式会社 | Electronic equipment and its driving method |
| CN107765928A (en) * | 2017-04-21 | 2018-03-06 | 青岛陶知电子科技有限公司 | A kind of multi-touch display system based on graphene optical sensing technology |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120919 Effective date of abandoning: 20150513 |
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| RGAV | Abandon patent right to avoid regrant |