CN102043543B - Optical touch control system and method - Google Patents
Optical touch control system and method Download PDFInfo
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- CN102043543B CN102043543B CN2009102250617A CN200910225061A CN102043543B CN 102043543 B CN102043543 B CN 102043543B CN 2009102250617 A CN2009102250617 A CN 2009102250617A CN 200910225061 A CN200910225061 A CN 200910225061A CN 102043543 B CN102043543 B CN 102043543B
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Abstract
The invention discloses an optical touch control system and an optical touch control method. In the optical touch control system, at least one optical reflecting body and a plurality of image acquisition modules are arranged at the side edge of a coordinate detection region; each image acquisition module is provided with an image acquisition module and a first light emitting module; moreover, the periphery of the coordinate detection region is provided with a second light emitting module; at a first time point, a plurality of first light emitting modules emit light and the plurality of image acquisition modules acquire a first image respectively; and at a second time point, the second light emitting module emits light and at least one image acquisition module in the plurality of image acquisition modules acquires at least one second image. The optical touch control system calculates the coordinate value of at least one object in the coordinate detection region according to the positions of the object in the first image and the second image respectively.
Description
Technical field
The invention relates to a kind of optical touch control system and method thereof, particularly luminous in different time points about a plurality of light sources of a kind of control, and the optical touch control technology of the volume coordinate of special object in calculating image according to the image that captures at these time points.
Background technology
In recent years, because the image display technology is constantly progressive, touch control screen is because have advantages of that can directly see through the way of contact inputs, become now common on the market a kind of display device, and be widely used in each electronic product such as point-of-sale terminals, visitor's guide system, ATM (Automatic Teller Machine) or multiple industrial control system etc.The Touch Screen Related product of general optical lens detection type, be subject to traditional adjusting mechanism size, needs larger design space can meet the demand of screen touch detection.The Touch Screen of traditional optical lens detection type is at least two image capture modules of installing on display panel, and needs to install a plurality of infrared light light sources around display panel, by the infrared light image of image capture module acquisition panel surface top.When object touching display panel surperficial, this object can block infrared light and be incident upon the light path of optical reflection body from illuminating module, and produce than dark areas on the optical reflection body, and then by the image capture module, captured, so just, can be according to the range of triangle algorithm, emulation is from the virtual ray of image capture module directive object, and the intersection of a plurality of virtual ray is positions of object touching, so to calculate the coordinate of object touching.
Yet when a plurality of objects touching display panels surperficial arranged, each image capture module can simulate many virtual ray, caused intersection number between virtual ray more than object number, easily caused the erroneous judgement of touch points position.For example, just can simulate from two emitted rays of image capture module and be connected to four dark districts that cause on the optical reflection body by two touch points on panel, just altogether have four joinings, produce the possibility of two groups of touch points positions, 50% erroneous judgement possibility is namely arranged.Along with contactor control device is day by day universal, the demand of multi-point touch has thereupon to be increased, and the judgement degree of accuracy that how to improve multi-point touch is a thing that needs to be resolved hurrily.
Summary of the invention
Because the problem that above-mentioned prior art exists the purpose of this invention is to provide a kind of optical touch control system and method thereof, to improve the judgement degree of accuracy of multi-point touch.
According to purpose of the present invention, a kind of optical touch control system is proposed, comprise at least one optical reflection body, a plurality of image capture module, a plurality of the first illuminating module, one second illuminating module, control module and a material computation module.At least one optical reflection body, a plurality of image capture module, a plurality of the first illuminating module and the second illuminating module are arranged at the periphery of a coordinate detection region.The image that a plurality of image capture modules cause in order to capture at least one object.The light that at least one optical reflection body sends a plurality of the first illuminating module and the second illuminating module reflexes to a plurality of image capture modules; Control module luminous in a plurality of the first illuminating module of very first time point control, and control a plurality of image capture modules and capture respectively one first image, and it is luminous to control the second illuminating module in one second time point, and controls at least one image capture module in a plurality of image capture modules and capture at least one second image.The material computation module, respectively at the position in a plurality of the first images and at least one the second image, calculates the coordinate figure of this at least one object in the coordinate detection region according at least one object.
Wherein, this coordinate detection region is preferably the surface of a display screen, and at least one optical reflection body is set up in the side of display screen, and a plurality of image capture modules are arranged at respectively the corner location of display screen.
Described the second illuminating module is arranged at the side of display screen, and between a plurality of image capture modules.
Described a plurality of the first illuminating module or the second illuminating module are sent invisible light.
Described a plurality of image capture module is used for acquisition one invisible light image.
When the number of this at least one object while being a plurality of, wherein the material computation module goes out a plurality of object candidates set of coordinates according to the position calculation of a plurality of objects in a plurality of the first images, then according to the position of a plurality of objects at least one second image, selects the coordinate of one as a plurality of objects from a plurality of object candidates set of coordinates.
Wherein, the material computation module is according to the position of a plurality of objects in a plurality of the first images, and a plurality of image capture modules are in the position of coordinate detection region, calculate many rays of a plurality of objects in directive shading light path, and calculate a plurality of intersecting point coordinates between many rays, and these intersecting point coordinates are hived off into a plurality of object candidates set of coordinates.
Wherein, controlling module, also controls the second illuminating module and closes when luminous in a plurality of the first illuminating module of very first time point control.
Wherein, control module and control the second illuminating module when luminous in the second time point, also control a plurality of the first illuminating module and close.
According to purpose of the present invention, a kind of optical touch control method is proposed, comprise the following step.At first, at least one optical reflection body, a plurality of image capture module, a plurality of the first illuminating module and one second illuminating module are set in the periphery of a coordinate detection region.The image that a plurality of image capture modules cause in order to capture at least one object.Then, luminous in a plurality of the first illuminating module of very first time point control, and control a plurality of image capture modules and capture respectively one first image.Then, control the second illuminating module in one second time point luminous, and control at least one image capture module in a plurality of image capture modules and capture at least one second image.Again according at least one object respectively at the position in a plurality of the first images and at least one the second image, calculate the coordinate figure of this at least one object in the coordinate detection region.
Wherein, this coordinate detection region is the surface of a display screen, and at least one optical reflection body is set up in the side of display screen, and a plurality of image capture modules are arranged at respectively the corner location of display screen.
The second illuminating module is arranged at the side of display screen, and between a plurality of image capture modules.
A plurality of the first illuminating module or the second illuminating module are sent invisible light.
A plurality of image capture modules are used for acquisition one invisible light image.
When the number of described at least one object while being a plurality of, this optical touch control method more comprises following steps: go out a plurality of object candidates set of coordinates according to the position calculation of a plurality of objects in a plurality of the first images, then according to the position of a plurality of objects at least one second image, select the coordinate of one as a plurality of objects from a plurality of object candidates set of coordinates.
Wherein, this optical touch control method more comprises the following step: according to the position of a plurality of objects in a plurality of the first images, and a plurality of image capture modules are in the position of coordinate detection region, calculate many rays of a plurality of objects in directive shading light path, calculate a plurality of intersecting point coordinates between many rays, more a plurality of intersecting point coordinates are hived off into above-mentioned a plurality of object candidates set of coordinates.
Wherein, when in a plurality of the first illuminating module of very first time point control, when luminous, also control the second illuminating module and close.
Wherein,, when controlling the second illuminating module in the second time point when luminous, also control a plurality of the first illuminating module and close.
From the above, according to optical touch control system of the present invention, it can have advantages of the judgement degree of accuracy that improves multi-point touch.
Description of drawings
Fig. 1 is the first schematic diagram of the embodiment of optical touch control system of the present invention;
Fig. 2 is the second schematic diagram of the embodiment of optical touch control system of the present invention;
Fig. 3 is the calcspar of the embodiment of optical touch control system of the present invention;
Fig. 4 is the process flow diagram of optical touch control method of the present invention.
[primary clustering symbol description]
10: control module; 11: the material computation module;
111: image process unit; 112: image capture module parameter;
113: the coordinate Calculation unit; 114: judging unit;
12,14: the image capture module; 121: visual angle;
13,15: the first images; 161,162: the first illuminating module;
163: the second illuminating module; 181～183: the optical reflection body;
191～194: the ray joining; 21: display screen;
23,25: the second images; 291,292: the shadow region on the optical reflection body;
41～47: steps flow chart.
Embodiment
See also Fig. 1 to Fig. 3, it is the first schematic diagram, the second schematic diagram and the calcspar of the embodiment of optical touch control system of the present invention.In figure, optical touch control system comprises one and controls module 10, a material computation module 11, a plurality of image capture module 12 and 14, a plurality of optical reflection body 181～183, a plurality of the first illuminating module 161 and 162 and 1 second illuminating module 163.Wherein, control module 10 and material computation module 11 and only be illustrated in Fig. 3, and optical reflection body 181～183 only is illustrated in Fig. 1 and Fig. 2.In figure, optical touch control system is set up on a display screen 21, uses the surface of display screen 21 as a coordinate detection region.Image capture module 12 and 14 is arranged at respectively the upper left corner and the upper right corner of display screen 21 peripheries, and its ornaments angle is take the surface image of fechtable display screen 21 as principle.Optical reflection body 181～183 is arranged at both sides and the base of display screen, and optical reflection body 181～183 is preferably single spectrum light transmissive material, mixed light material or reflectorized material and forms.The first illuminating module 161 and 162 setting position be corresponding image capture module 12 and 14 respectively, makes the first illuminating module 161 and 162 light that send can be incident upon respectively image capture module 12 and 14 after 181～183 reflections of optical reflection body.The second illuminating module 163 is arranged on the upside of display screen, between image capture module 12 and 14.Wherein, the first illuminating module 161 and 162, or the second illuminating module 163 is preferably and sends invisible light, infrared light for example, and image capture module 12 and 14 also fechtable invisible light image, for example infrared light image.
Control module 10 luminous in very first time point control first illuminating module 161 and 162, image capture module 12 and 14 can capture respectively brightness and background the image of drop was arranged this moment.When object touching display screen 21 surperficial arranged, be incident upon optical reflection body 181,182,183 light path because this object can block the first illuminating module 161 and 162 light that send, and by image capture module 12 and 14 acquisitions to the darkness districts on the first image 13 and 15.For example when two objects touch position 191 and 192 time are respectively arranged, the first image 13 and 15 in have dark district, two places.While note that a plurality of object touch coordinate detection region, because of the relation (for example position conllinear of a plurality of objects and image capture module) of angle, the number in the darkness district in the image that the image capture module captures can be less than object number sometimes.
Material computation module 11 more comprises an image process unit 111, an image capture module parameter 112, a coordinate Calculation unit 113 and a judging unit 114.After material computation module 11 receives the first image 13 and 15, first by image process unit 111, analyze the first image 13 and 15 interior dark zone position.Image capture module parameter 112 comprises the visual angle parameter of image capture module 12 and 14 at least, in position and the resolution of coordinate detection region.Interior receivable smooth signals in visual angle 121 of image capture module 12 and 14 due to the first image 13 and 15, so can extrapolate which orientation of the object in shading light path in image capture module 12 and 14 according to the first image 13 and 15 interior dark zone position.Because each dark zone position is to be caused by object shading light path, coordinate Calculation unit 113 can calculate the ray of the object in directive shading light path according to dark zone position and image capture module parameter 112, and namely the indicated object position is positioned on this ray.Because same target can capture on the image that module captures and cause dark district at different images, so coordinate Calculation unit 113 calculates the joining between the ray that sends from image capture module 12 and 14, to obtain the coordinate of object.Foregoing is the rough description of triangle telemetry, due to triangle telemetry for this reason those skilled in the art know, therefore be not described in detail in this.
While being a plurality of, as shown in Figure 1, the first image 13 and 15 has respectively two dark districts when the object of touching display screen 21, and material computation module 11 calculates respectively from image capture module 12 and 14 two rays that penetrate, and then calculates the joining between ray.Yet can find between four rays to have four ray joinings 191～194 this moment, and two object candidates set of coordinates are arranged, and one group is ray joining 191 and 192, and another group is ray joining 193 and 194.Therefore, control module 10 luminous in one second time point control the second illuminating module 163, and control the first illuminating module 161 and 162, stop luminous.Control module 10 is then controlled image capture module 12 and 14 and is captured respectively one second image 23 and 25, perhaps controls two image capture modules 12 and 14 wherein at least one image capture module 12 or 14 at least one second image 23 or 25 of acquisition.As shown in Figure 2, when the second illuminating module 163 only when luminous, two objects form two shades on optical reflection body 182, zone 291,292 as shown in Figure 2, its position, therefore respectively have two dark districts on the second image 23 and 25 that image capture module 12 and 14 captures, or also have two shadow regions on the second image 23 or 25 that one of them the image capture module 12 or 14 in two image capture modules 12 and 14 is captured.
The judging unit 114 of material computation module 11 can judge to select which object candidates set of coordinates according to the dark zone position in the second image 23 and 25, and perhaps the judging unit 114 of material computation module 11 can only judge to select which object candidates set of coordinates according to the position, shadow region in any second image 23 or 25.Take Fig. 2 as example, if ray joining 193 and 194 is for touching a little, two shades on optical reflection body 182 should be quite approaching, do not meet with the dark zone position in one of them second image 23 in two the second images 23 and 25 or 25, so material computation module 11 just can select to comprise the object candidates set of coordinates of ray joining 191 and 192 as correct touching a little.Wherein, image process unit 111, coordinate Calculation unit 113 and judging unit 114 are preferably realized with the software mode of processor execution relative program.
Optical touch control system of the present invention utilizes the framework of traditional slur picture acquisition module, only installs the judging unit 114 in the second extra illuminating module 162 and material computation module additional, just can increase the accuracy of optical touch control system multi-point touch.
See also Fig. 4, it illustrates the process flow diagram of optical touch control method of the present invention.In figure, the optical touch control method comprises the following step.In step 41, at least one optical reflection body, a plurality of image capture module, a plurality of the first illuminating module and one second illuminating module are set in the periphery of a coordinate detection region.Wherein, the coordinate detection region is preferably the surface of a display screen, and a plurality of image capture modules are arranged at respectively adjacent two corners of display screen, for example position, the upper left corner and position, the upper right corner.At least one optical reflection body is set up in the side of display screen, and for example three optical reflection bodies are arranged at respectively dual-side and the base of display screen, and the optical reflection body is preferably single spectrum light transmissive material, mixed light material or reflectorized material and forms; Also or coat dual-side and the base of display screen with integrally formed optical reflection body.The first illuminating module and one second illuminating module are preferably sends invisible light, infrared light for example, and a plurality of image capture module captures the image that at least one object causes, for example invisible light image.
In step 42, luminous in a plurality of the first illuminating module of very first time point control, and control these image capture modules and capture respectively one first image.Wherein, luminous for stopping when the second illuminating module was put in the very first time, to avoid affecting darkness district number and the position in the first image.In step 43, control the second illuminating module in one second time point luminous, and control a plurality of image capture modules and capture respectively one second image, perhaps control at least one image capture module in a plurality of the second illuminating module and capture at least one second image.Wherein, a plurality of the first illuminating module are luminous for stopping when the second time point, to avoid affecting darkness district number and the position in the second image.
, in step 44, according to the position calculation of object in a plurality of the first images, go out at least one object candidates set of coordinates.Wherein, the position of object in a plurality of the first images is to do image processing and to obtain the first image., in step 45, judge whether the object candidates set of coordinates is a plurality of, if perform step 46; If not, perform step 47, with the coordinate of this object candidates set of coordinates output as object.
When the object candidates set of coordinates while being a plurality of, step 46 according to object the position in a plurality of the second images or the position of object at least one second image, select the coordinate of one as a plurality of objects from a plurality of object candidates set of coordinates, and with this coordinate output.Note that in step 42 and step 43 and mention very first time point and the second time point, be for illustrating that the first image and the second image are captured by different time, but there is no certain sequencing, also can first perform step 43 and perform step again 42.
The foregoing is only the preferred embodiments of the present invention, is only illustrative for the purpose of the present invention, and nonrestrictive; It will be appreciated by those skilled in the art that in the spirit and scope that the claims in the present invention limit and can carry out many changes to it, revise, even equivalence change, but all will fall within the scope of protection of the present invention.
Claims (14)
1. optical touch control system, comprise a plurality of the first illuminating module, a plurality of image capture modules in order to capture the image that at least one object causes, at least one optical reflection body, and control module and a material computation module, it is characterized in that: described optical touch control system also comprises one second illuminating module
Described the second illuminating module is arranged at the side of a coordinate detection region, and between described a plurality of image capture modules, described coordinate detection region is the surface of a display screen;
Described a plurality of image capture module is arranged at respectively the corner location of described display screen;
Described a plurality of the first illuminating module corresponding described a plurality of image capture modules respectively arranges;
Described at least one optical reflection body is arranged at the periphery of described display screen, and the light that described at least one optical reflection body sends described a plurality of the first illuminating module and described the second illuminating module reflexes to described a plurality of image capture module;
described control module is luminous in described a plurality of the first illuminating module of very first time point control, and control described a plurality of image capture module and capture respectively one first image, and it is luminous to control described the second illuminating module in one second time point, and control at least one module in described a plurality of image capture module and capture at least one second image, described control module is in described a plurality of the first illuminating module of described very first time point control luminous the time, controlling described the second illuminating module closes, described control module is controlled described the second illuminating module luminous the time in described the second time point, controlling described a plurality of the first illuminating module closes, and
Described material computation module, respectively at the position in described a plurality of the first images and described at least one second image, calculates the coordinate figure of described at least one object in described coordinate detection region according to described at least one object.
2. optical touch control system as claimed in claim 1, it is characterized in that: described at least one optical reflection body is set up in the side of described display screen.
3. optical touch control system as claimed in claim 1, it is characterized in that: described a plurality of the first illuminating module or described the second illuminating module are sent invisible light.
4. optical touch control system as claimed in claim 3, is characterized in that: described a plurality of image capture module acquisition one invisible light image.
5. optical touch control system as claimed in claim 1, it is characterized in that: when the number of described at least one object while being a plurality of, described material computation module goes out a plurality of object candidates set of coordinates according to the position calculation of described a plurality of objects in described a plurality of the first images, then according to the position of described a plurality of objects in described at least one second image, selects the coordinate of one as described a plurality of objects from described a plurality of object candidates set of coordinates.
6. optical touch control system as claimed in claim 5, it is characterized in that: described material computation module is according to the position of described a plurality of objects in described a plurality of the first images, and described a plurality of image capture module is in the position of described coordinate detection region, calculate many rays of described a plurality of objects in directive shading light path, and calculate a plurality of intersecting point coordinates between described many rays, and described a plurality of intersecting point coordinates are hived off into described a plurality of object candidates set of coordinates.
7. optical touch control system as claimed in claim 1, it is characterized in that: described optical reflection body is consisted of single spectrum light transmissive material, mixed light material or reflectorized material.
8. optical touch control method comprises the following step:
at least one optical reflection body is set in the periphery of a coordinate detection region, a plurality of image capture modules, a plurality of the first illuminating module and one second illuminating module, described coordinate detection region is the surface of a display screen, described a plurality of the first illuminating module corresponding described a plurality of image capture modules respectively arranges, described the second illuminating module is arranged at the side of a coordinate detection region, and between described a plurality of image capture modules, described a plurality of image capture module is arranged at respectively the corner location of described display screen, the image that causes in order to capture at least one object,
Luminous in described a plurality of the first illuminating module of very first time point control, and control described a plurality of image capture module and capture respectively one first image, when in described a plurality of the first illuminating module of described very first time point control, when luminous, also control described the second illuminating module and close;
Control described the second illuminating module in one second time point luminous, and control at least one module in described a plurality of image capture module and capture at least one second image,, when controlling described the second illuminating module in described the second time point when luminous, also control described a plurality of the first illuminating module and close; And
, respectively at the position in described a plurality of the first images and described this at least one second image, calculate the coordinate figure of described at least one object in described coordinate detecting pressure according to described at least one object.
9. optical touch control method as claimed in claim 8, it is characterized in that: described at least one optical reflection body is set up in the side of described display screen.
10. optical touch control method as claimed in claim 8, it is characterized in that: described a plurality of the first illuminating module or described the second illuminating module are sent invisible light.
11. optical touch control method as claimed in claim 10 is characterized in that: described a plurality of image capture module acquisition one invisible light image.
12. optical touch control method as claimed in claim 8 is characterized in that: while being a plurality of, described optical touch control method more comprises the following step when the number of described at least one object:
Go out most object candidates set of coordinates according to the position calculation of described a plurality of objects in described a plurality of the first images; And
Select the coordinate of one as described a plurality of objects from described a plurality of object candidates set of coordinates according to the position of described a plurality of objects in described at least one second image.
13. optical touch control method as claimed in claim 12 is characterized in that: described method more comprises the following step:
According to the position of described a plurality of objects in described a plurality of the first images, and described a plurality of image capture module calculates many rays of described a plurality of objects in directive shading light path in the position of described coordinate detection region;
Calculate a plurality of intersecting point coordinates between described many rays; And
Described a plurality of intersecting point coordinates are hived off into described a plurality of object candidates set of coordinates.
14. optical touch control method as claimed in claim 8 is characterized in that: described optical reflection body is consisted of single spectrum light transmissive material, mixed light material or reflectorized material.
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| TWI454995B (en) * | 2011-08-11 | 2014-10-01 | Wistron Corp | Optical touch device and coordinate detection method thereof |
| TWI464653B (en) | 2012-08-10 | 2014-12-11 | Pixart Imaging Inc | Optical touch system and optical touch contorl method |
| CN102915161A (en) * | 2012-10-31 | 2013-02-06 | Tcl通力电子（惠州）有限公司 | Infrared touch device and identification method thereof |
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| CN1459705A (en) * | 2002-05-23 | 2003-12-03 | 高启烈 | Contact surface plate device having optical position detection |
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