CN103412686A - Multi-point touch screen coordinated with four-way camera and corresponding touch method - Google Patents
Multi-point touch screen coordinated with four-way camera and corresponding touch method Download PDFInfo
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- CN103412686A CN103412686A CN2013103894020A CN201310389402A CN103412686A CN 103412686 A CN103412686 A CN 103412686A CN 2013103894020 A CN2013103894020 A CN 2013103894020A CN 201310389402 A CN201310389402 A CN 201310389402A CN 103412686 A CN103412686 A CN 103412686A
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Abstract
The invention discloses a multi-point touch screen coordinated with a four-way camera and a corresponding touch method. The touch screen comprises four cameras, corresponding infrared light sources, a controller, a positioning frame, reflective bars and a touch screen main body, wherein the touch screen main body is used for receiving touch operations; the positioning frame is arranged on the periphery of the touch screen main body; the reflective bars are arranged on the peripheries of the inner surface of the positioning frame to be used for reflecting rays emitted by the infrared light sources; the four cameras are mutually connected with the corresponding infrared light sources and are respectively mounted in four corners of the positioning frame; the controller is arranged between two of the four cameras and the corresponding infrared light sources, and the controller is used for inputting information collected by corresponding cameras to a computer and obtaining the coordinate data of touch points through calculation. The invention further discloses a corresponding method for multi-point touch. According to the multi-point touch screen and the corresponding touch method, cameras in four corners of the touch screen, the infrared light sources and the reflective bars on the inner surface of the touch screen are adopted to realize the removal of false points in an optical touch screen, and true touch points are obtained.
Description
Technical field
The present invention relates to field of human-computer interaction and optical touch technical field, be specifically related to a kind of four-way CCD camera collaborative multi-point touch panel and corresponding touch control method.
Background technology
Along with being widely used of the equipment such as smart mobile phone, panel computer, touch technology has entered the every aspect of people's daily lifes, and touch-screen is easy to use with it, and the advantage such as be swift in response, by increasing people is accepted.
At present comparatively ripe touch technology has touch screens, capacitance plate, surface acoustic wave, camera optical alignment etc., and wherein to have positioning precision high for camera optical alignment touch technology, and the advantage such as be quick on the draw.In existing optical touch field, the touch technology comparative maturity of single-point is stable, but, aspect the touch technology of multiple spot, also has some problems.The most outstanding is exactly the existence of false point, has affected the effect of multi-point touch.The emphasis of the problems referred to above solution is to improve traditional camera optical touch control apparatus, improves the accuracy of identification.
Summary of the invention
The problem existed in order to solve above-mentioned prior art, the purpose of this invention is to provide a kind of four-way CCD camera collaborative multi-point touch panel and corresponding touch control method.
For solving the problems of the technologies described above, according to an aspect of the present invention, the collaborative multi-point touch panel of a kind of four-way CCD camera is proposed, this touch-screen comprises: four-way CCD camera and corresponding infrared light supply, controller, posting, reflecting strips and touch-screen main body, wherein:
Described touch-screen main body is for receiving touch operation;
Described posting is positioned at the surrounding of described touch-screen main body, for fixing touch-screen main body;
Described reflecting strips is arranged on the surrounding of described posting inside surface, the light sent for the reflective infrared light source;
Described four-way CCD camera interconnects with corresponding infrared light supply, and is arranged on respectively on four angles of described posting, is used to described touch operation that light source is provided, and records described touch operation;
Described controller is arranged between the two-way in described four-way CCD camera and corresponding infrared light supply, for the input information computing machine that corresponding camera collection is obtained, calculates the coordinate data of touch point.
According to a further aspect in the invention, also propose the collaborative multi-touch method of a kind of four-way CCD camera, the method comprises the following steps:
Step 1, respectively touch the collection of image in the position of touch-screen posting to the four-way CCD camera ，Ge road camera that divides into groups according to four-way CCD camera;
Step 2, obtain the touch point data in the touch image that each road camera collection obtains, and calculates the relation between camera and position, touch point;
Step 3, the relation according between touch point and four groups of camera positions, obtain and four groups of a plurality of intersection points that camera is corresponding;
Step 4, according to the coordinate of the corresponding all intersection points of described four groups of cameras, judgement obtains real touch point.
The present invention proposes a kind of four-way CCD camera collaborative multi-point touch panel and corresponding touch control method.By the collaborative work of four-way CCD camera, can accurately tell true touch point and false point, improved the recognition performance of touch point, realized optical multi-touch.
The accompanying drawing explanation
Fig. 1 is the structural representation of the collaborative multi-point touch panel of four-way CCD camera of the present invention;
Fig. 2 is the collaborative multi-touch method process flow diagram of four-way CCD camera of the present invention;
Fig. 3 is the schematic diagram when simultaneously a plurality of touch point being arranged on one embodiment of the invention touch-screen;
Fig. 4 is the schematic diagram of coordinate system of the present invention and touch point straight line computing method.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
Fig. 1 is the structural representation of the collaborative multi-point touch panel of four-way CCD camera of the present invention, and as shown in Figure 1, described multi-point touch panel comprises: four-way CCD camera and corresponding infrared light supply, and controller, posting, reflecting strips and touch-screen main body, wherein:
Described touch-screen main body is for receiving touch operation;
Described posting is positioned at the surrounding of described touch-screen main body, for fixing touch-screen main body;
Described reflecting strips is arranged on the surrounding of described posting inside surface, the light sent for the reflective infrared light source;
Described four-way CCD camera interconnects with corresponding infrared light supply, and is arranged on respectively on four angles of described posting, is used to described touch operation that light source is provided, and records described touch operation; Wherein, described four-way CCD camera comprises with corresponding infrared light supply the first camera and the infrared light supply 201 that is arranged on the upper left corner, the second camera in the upper right corner and infrared light supply 202, the 3rd camera and the infrared light supply 203 in the lower right corner, the 4th camera and the infrared light supply 204 in the lower left corner.
Described controller is arranged between the two-way in described four-way CCD camera and corresponding infrared light supply, for the input information computing machine that corresponding camera collection is obtained, calculates the coordinate data of touch point.
According to a further aspect in the invention, also propose the collaborative multi-touch method of a kind of four-way CCD camera, as shown in Figure 2, said method comprising the steps of:
Step 1, respectively touch the collection of image in the position of touch-screen posting to the four-way CCD camera ，Ge road camera that divides into groups according to four-way CCD camera;
In an embodiment of the present invention, the two-way camera 201,202 be arranged on above the touch-screen posting is divided into to first group, the two-way camera 202,203 that is arranged on touch-screen posting the right is divided into to second group, the two-way camera 203,204 be arranged on below the touch-screen posting is divided into to the 3rd group, the two-way camera 204,201 that is arranged on the touch-screen posting left side is divided into to the 4th group;
Step 2, obtain the touch point data in the touch image that each road camera collection obtains, and calculates the relation between camera and position, touch point;
In an embodiment of the present invention, utilize the expression formula of camera and place, touch point straight line to characterize the relation between described camera and position, touch point, as shown in Figure 3, due to the finger etc. block, in the image that camera obtains, blackspot occurred, the center of blackspot is the position of touch point.
The method that calculates the expression formula of described camera and place, touch point straight line specifically comprises the following steps:
Step 21, the distance of establishing the blackspot centre distance touch image leftmost side is m, the image overall length is n, calculates the angle α between touch point P0 place straight line and left frame according to following formula, as shown in Figure 4:
Step 22, establish that posting is long is a, and wide be b, as shown in Figure 4, take the posting lower left corner to set up rectangular coordinate system as initial point, the coordinate in the described posting upper left corner be (0, b), the expression formula that so obtains the first camera 201 and place, touch point straight line is:
y=-cotα·x+b；
In like manner, according to the coordinate of different cameras and the angle of place, touch point straight line and frame, can calculate the expression formula of touch point and other each camera place straight lines.
Step 3, the relation according between touch point and four groups of camera positions, obtain and four groups of a plurality of intersection points that camera is corresponding;
In described step 3, the circular of intersection point as shown in Figure 4, at first, according to touch point P0 and P1 and first group of two camera 201 and 202 four straight lines that form respectively, obtains four intersection point P0, P1, a, b; In like manner, according to touch point P0 and P1 and second group of two camera 202 and 203 four straight lines that form respectively, obtain four intersection point P0, P1, c, d; According to touch point P0 and P1 and the 3rd group of two camera 203 and 204 straight lines that form respectively, obtain four intersection point P0, P1, e, f; According to touch point P0 and P1 and the 4th group of two camera 204 and 201 straight lines that form respectively, obtain four intersection point P0, P1, g, h(wherein intersection point h, beyond posting, belong to invalid intersection point).
Step 4, according to the coordinate of the corresponding all intersection points of described four groups of cameras, judgement obtains real touch point.
The judgement of described real touch point can be with reference to figure 4, and as shown in Figure 4, described step 4 is further comprising the steps:
Step 41, set a little distance threshold;
Step 42, calculate the intersection point of every group of camera and other organize the distance between the gained intersection point, if described distance is less than set distance threshold, thinks that so the intersection point obtained is same point, and it is merged;
Step 43, if the intersection point that four groups of cameras obtain can be merged into same point, this is real touch point so, as the P0 in Fig. 4 and P1 2 points; The intersection point obtained simultaneously if not four groups of cameras, this point is considered as false point and is rejected so, as the intersection point except P0 and P1 in Fig. 4.
By said method, just can reject a plurality of false points, detect real touch point.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (8)
1. the multi-point touch panel that four-way CCD camera is collaborative, is characterized in that, this touch-screen comprises: four-way CCD camera and corresponding infrared light supply, and controller, posting, reflecting strips and touch-screen main body, wherein:
Described touch-screen main body is for receiving touch operation;
Described posting is positioned at the surrounding of described touch-screen main body, for fixing touch-screen main body;
Described reflecting strips is arranged on the surrounding of described posting inside surface, the light sent for the reflective infrared light source;
Described four-way CCD camera interconnects with corresponding infrared light supply, and is arranged on respectively on four angles of described posting, is used to described touch operation that light source is provided, and records described touch operation;
Described controller is arranged between the two-way in described four-way CCD camera and corresponding infrared light supply, for the input information computing machine that corresponding camera collection is obtained, calculates the coordinate data of touch point.
2. touch-screen according to claim 1, it is characterized in that, described four-way CCD camera comprises with corresponding infrared light supply: the first camera and the infrared light supply that are arranged on the upper left corner, the second camera in the upper right corner and infrared light supply, the 3rd camera and the infrared light supply in the lower right corner, the 4th camera and the infrared light supply in the lower left corner.
3. the multi-touch method that four-way CCD camera is collaborative, is characterized in that, the method comprises the following steps:
Step 1, respectively touch the collection of image in the position of touch-screen posting to the four-way CCD camera ，Ge road camera that divides into groups according to four-way CCD camera;
Step 2, obtain the touch point data in the touch image that each road camera collection obtains, and calculates the relation between camera and position, touch point;
Step 3, the relation according between touch point and four groups of camera positions, obtain and four groups of a plurality of intersection points that camera is corresponding;
Step 4, according to the coordinate of the corresponding all intersection points of described four groups of cameras, judgement obtains real touch point.
4. method according to claim 3, it is characterized in that, the two-way camera be arranged on above the touch-screen posting is divided into to first group, the two-way camera that is arranged on touch-screen posting the right is divided into to second group, the two-way camera be arranged on below the touch-screen posting is divided into to the 3rd group, the two-way camera that is arranged on the touch-screen posting left side is divided into to the 4th group.
5. method according to claim 3, is characterized in that, utilizes the expression formula of camera and place, touch point straight line to characterize the relation between described camera and position, touch point.
6. method according to claim 5, is characterized in that, in described step 2, the expression formula of calculating described camera and place, touch point straight line specifically comprises the following steps:
Step 21, establish touch point and be m apart from the distance that touches the image leftmost side, and the image overall length is n, calculates the angle α between touch point P0 place straight line and posting left frame according to following formula:
Step 22, establish that posting is long is a, and wide is b, take the posting lower left corner to set up rectangular coordinate system as initial point, obtains the expression formula of the first camera and place, touch point straight line:
y=-cotα·x+b；
Step 23, in like manner, according to the coordinate of different cameras and the angle of place, touch point straight line and frame, calculate the expression formula of touch point and other each camera place straight lines.
7. method according to claim 3, is characterized in that, in described step 3, the circular of intersection point is, at first, according to touch point and first group of four straight line that two cameras form respectively, obtains four intersection points; In like manner, according to touch point and second group of four straight line that two cameras form respectively, obtain another four intersection points; According to touch point and the 3rd group of two straight lines that camera forms respectively, obtain another four intersection points; According to touch point and the 4th group of two straight lines that camera forms respectively, obtain another four intersection points.
8. method according to claim 3, is characterized in that, described step 4 is further comprising the steps:
Step 41, set a little distance threshold;
Step 42, calculate the intersection point of every group of camera and other organize the distance between the gained intersection point, if described distance is less than set distance threshold, thinks that so the intersection point obtained is same point, and it is merged;
Step 43, if the intersection point that four groups of cameras obtain can be merged into same point, this is real touch point so, the intersection point obtained simultaneously if not four groups of cameras, this point is considered as false point and is rejected so.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103795935A (en) * | 2014-03-05 | 2014-05-14 | 吉林大学 | Camera shooting type multi-target locating method and device based on image rectification |
| CN103793113A (en) * | 2014-03-10 | 2014-05-14 | 航天海鹰光电信息技术（天津）有限公司 | Imaging locating method of optical touch module and optical touch control equipment |
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| US20040178993A1 (en) * | 2003-03-11 | 2004-09-16 | Morrison Gerald D. | Touch system and method for determining pointer contacts on a touch surface |
| CN101354624A (en) * | 2008-05-15 | 2009-01-28 | 中国人民解放军国防科学技术大学 | Surface computing platform of four-way CCD camera collaborative work and multi-contact detection method |
| CN201628945U (en) * | 2009-09-10 | 2010-11-10 | 北京汇冠新技术股份有限公司 | Touch screen with reflective strip |
| CN102932614A (en) * | 2012-10-16 | 2013-02-13 | 谢继红 | Smart television with optical touch screen |
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2013
- 2013-08-30 CN CN2013103894020A patent/CN103412686A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040178993A1 (en) * | 2003-03-11 | 2004-09-16 | Morrison Gerald D. | Touch system and method for determining pointer contacts on a touch surface |
| CN101354624A (en) * | 2008-05-15 | 2009-01-28 | 中国人民解放军国防科学技术大学 | Surface computing platform of four-way CCD camera collaborative work and multi-contact detection method |
| CN201628945U (en) * | 2009-09-10 | 2010-11-10 | 北京汇冠新技术股份有限公司 | Touch screen with reflective strip |
| CN102932614A (en) * | 2012-10-16 | 2013-02-13 | 谢继红 | Smart television with optical touch screen |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103795935A (en) * | 2014-03-05 | 2014-05-14 | 吉林大学 | Camera shooting type multi-target locating method and device based on image rectification |
| CN103795935B (en) * | 2014-03-05 | 2017-12-12 | 吉林大学 | A kind of camera shooting type multi-target orientation method and device based on image rectification |
| CN103793113A (en) * | 2014-03-10 | 2014-05-14 | 航天海鹰光电信息技术（天津）有限公司 | Imaging locating method of optical touch module and optical touch control equipment |
| CN103793113B (en) * | 2014-03-10 | 2019-04-16 | 天津津航技术物理研究所 | A kind of the imaging localization method and optical touch control equipment of optical touch mould group |
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Application publication date: 20131127 |