CN102314263A - Optical touch screen system and optical distance judgment device and method - Google Patents
Optical touch screen system and optical distance judgment device and method Download PDFInfo
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Abstract
The invention discloses an optical touch screen system, an optical distance judgment device and an optical distance judgment method. A first image sensing component acquires a first image of an image which comprises an object on an operation panel; an auxiliary image sensing component acquires an auxiliary image of the image which comprises the object on the operation panel; and a distance judgment unit calculates a pixel distance of the object between imaging positions of the first image and the auxiliary image, and calculates an approximate distance between the object and the first image sensing component according to the pixel distance, an entity distance between the first image sensing component and the auxiliary image sensing component and a focal distance of the first image sensing component. Therefore, through the auxiliary image sensing component, the problem of misjudgment of a plurality of touch points caused by a plurality of co-constructed intersection points formed by blockage of a plurality of optical paths under the condition of touch of a plurality of objects to be detected can be solved.
Description
Technical field
The invention relates to a kind of optical touch screen system, optical range judgment means and method thereof, refer to a kind of multiple spot optical touch screen system, optical range judgment means and method thereof of distinguishing ghost especially.
Background technology
The Touch Screen technology has been widely used in the various electronic product now, for example ATM, portable electric device and display.Generally speaking, the Touch Screen technology can be divided into three kinds of resistance-type, condenser type and optical profile types.Wherein resistance-type and capacitance touch control screen technology are when utilizing object contact sensing device, cause the surperficial electric field change of Touch Screen and anchored object.The optical touch control Screen Technology then is when utilizing object on the Touch Screen surface, to move, and causes light path blocking-up or shadow variation and anchored object.
Since the optical touch control Screen Technology must be not special in the production procedure of display device processing procedure and assembly, so the production cost of optical touch control screen is low than resistance-type and capacitance touch control screen.But the optical touch control screen is under the situation of multi-point touch, and the common structure intersection point that forms because many light paths are blocked easily causes the erroneous judgement of touch point.Though prior art can be used the image of different time points, judge real touch point, if when object to be measured is static, still can't judge real touch point.Please with reference to Fig. 1, Fig. 1 is that explanation optical touch control screen is under the situation of multi-point touch, because many light paths are blocked the synoptic diagram of formed ghost (ghost point) touch point.As shown in Figure 1; After the light path that light source 101,102 is launched is blocked by object O1 to be measured, O2; The optical touch control screen of prior art is because only judge whether light path is blocked (distance of not judging object to be measured); So except determining object O1 to be measured, O2, also can produce ghost touch point G1, G2 in addition because of the common structure intersection point of the light path that is blocked.
Summary of the invention
One embodiment of the invention provide a kind of optical range judgment means.This optical range judgment means comprises first image sensing component, auxiliary image sensing component and apart from judging unit.This first image sensing component is in order to obtain first image of the image information that comprises object; Should auxiliary image sensing component be in order to obtaining the assistant images of the image information that comprises this object, and this first image sensing component with should auxiliary image sensing component at a distance of preset physical distance; And this is in order to calculating the pixel distance of this object at the image space of this first image and this assistant images apart from judging unit, and according to the approximate distance between the focal length of this pixel distance, this physical distance and this first image sensing component and focal length this object of calculating that should assist image sensing component and this first image sensing component.
An also embodiment of the present invention provides a kind of optical touch screen system.This optical touch screen system comprises guidance panel, first image sensing component, second image sensing component, auxiliary image sensing component, coordinate Calculation unit and real shadow judging unit.This guidance panel is in order to a plurality of object contacts to be provided; This first image sensing component is in order to obtain first image of the image information that comprises these objects on this guidance panel; This second image sensing component is in order to obtain second image of the image information that comprises these objects on this guidance panel; Being somebody's turn to do auxiliary image sensing component be the assistant images that comprises the image information of at least one destination object in these objects on this guidance panel in order to obtain, and this first image sensing component physical distance preset apart with assisting image sensing component; This coordinate Calculation unit is in order to according to the image space of these objects on this first image and this second image, calculates a plurality of candidate's coordinates of these objects that comprise this destination object; And this reality shadow judging unit is in order to calculating the pixel distance of this destination object at the image space of this first image and this assistant images, and from these candidate's coordinates, selectes the coordinate that coordinate is this destination object according to the focal length of this pixel distance, this physical distance and this first image sensing component and focal length that should auxiliary image sensing component.
An also embodiment of the present invention provides a kind of method of optical touch range finding.This method is included in the primary importance of different corners in the guidance panel and first image and second image that the second place is obtained the image information that comprises a plurality of objects respectively; Obtaining the assistant images that comprises the image information of at least one destination object in these objects with this primary importance at a distance of the aided location of physical distance, wherein is to obtain this first image and this assistant images with the focal length of this first image sensing component and the focal length of this auxiliary image sensing component; Calculate a plurality of candidate's coordinates of these objects that comprise this destination object according to the image space of these objects in this first image and this second image; From these candidate's coordinates, selected the coordinate of a coordinate according to the focal length of image space, this primary importance and this aided location of this destination object in this first image and this assistant images this physical distance and this first image sensing component apart and focal length that should auxiliary image sensing component as this destination object.
The method of a kind of optical range judgment means provided by the present invention, optical touch screen system and optical touch range finding; Utilize auxiliary image sensing component collocation image sensing component, judge the approximate distance between object to be measured and this image sensing component according to triangle similar figures principle.This approximate distance according between this object to be measured and this image sensing component can solve under the situation of a plurality of object touch-controls to be measured, and a plurality of structure intersection points altogether that form because many light paths are blocked cause the problem of a plurality of touch points erroneous judgements.
Description of drawings
Fig. 1 is that explanation optical touch control screen is under the situation of multi-point touch, because many light paths are blocked the synoptic diagram of formed ghost touch point.
Fig. 2 is the synoptic diagram of one embodiment of the invention explanation optical range judgment means.
Fig. 3 is explanation apart from judging unit according to object to be measured at the image space of first image and image space at assistant images, the synoptic diagram of the pixel distance of decision.
Fig. 4 A and Fig. 4 B are the synoptic diagram of the triangle relation between explanation first image sensing component, auxiliary image sensing component and the object to be measured.
Fig. 5 is the synoptic diagram that an also embodiment of the present invention explains the optical touch screen system.
Fig. 6 is the synoptic diagram that an also embodiment of the present invention explains the optical touch screen system.
Fig. 7 is that the present invention goes back the process flow diagram that an embodiment explains a kind of method of optical touch range finding.
Wherein, description of reference numerals is following:
101,102 light sources
200 optical range judgment means
206 apart from judging unit
302 first images
3022,3042 image spaces
304 assistant images
500,600 optical touch screen systems
502,602 guidance panels
202,504,604 first image sensing components
506,606 second image sensing components
204,508,608 auxiliary image sensing components
510,610 coordinate Calculation unit
512,612 real shadow judging units
614 the 3rd image sensing components
B, b1 physical distance
The f focal length
The d pixel distance
The number of the field of n, n1 picture element matrix
The width of the field of w, w1 picture element matrix
The Zt approximate distance
O1, O2 object to be measured
G1, G2 ghost touch point
The 70-80 step
Embodiment
Please with reference to Fig. 2, Fig. 2 is the synoptic diagram of one embodiment of the invention explanation optical range judgment means 200.Optical range judgment means 200 comprises first image sensing component 202, auxiliary image sensing component 204 and apart from judging unit 206.First image sensing component 202 is in order to obtain first image of the image that comprises object to be measured.Auxiliary image sensing component 204 is in order to obtain the assistant images of the image that comprises object to be measured; Wherein first image sensing component 202 and auxiliary image sensing component 204 are at a distance of preset physical distance b; And and the focal length of first image sensing component 202 is identical with the focal length of auxiliary image sensing component 204, is all f.In addition, first image sensing component 202 is identical with the visual angle of auxiliary image sensing component 204, and first image sensing component 202 is all identical with the field number of the picture element matrix of auxiliary image sensing component 204 field width identical and each field.Apart from judging unit 206 is to be coupled to first image sensing component 202 and auxiliary image sensing component 204; In order to calculating the pixel distance d (be shown in Fig. 3) of object 208 to be measured between the image space of first image and assistant images, and calculate the approximate distance between the object to be measured and first image sensing component 202 according to pixel distance d, physical distance b and focal distance f.
This first image sensing component 202 can directly be exported first image and the assistant images that is obtained with assisting image sensing component 204; Should then directly calculate the image space of object 208 to be measured apart from judging unit 206, and then calculate the pixel distance d of this object 208 to be measured in the imaging of this first image and this assistant images at first image and assistant images according to this first image and this assistant images.And this first image sensing component 202 with should auxiliary image sensing component 204 also can handle institute's this first image that obtains and this assistant images in order to calculating the image space of object 208 to be measured at first image and assistant images, this apart from these image spaces of 206 receptions of judging unit in order to calculate this pixel distance d.And utilize this first image sensing component 202 and the image spaces that should assist image sensing component 204 directly to calculate these objects 208 to be measured can significantly reduce this first image sensing component 202 and the data volume that should assist image sensing component 204 required outputs.
Please with reference to Fig. 3, Fig. 3 explains apart from judging unit 206 according to the image space 3022 and to be measured object 208 image space 3042 at assistant images 304, the synoptic diagram of the pixel distance d of decision of object 208 to be measured at first image 302.As shown in Figure 3, pixel distance d is to be the gap between the image space of first image sensing component 202 and this object 208 to be measured of auxiliary image sensing component 204 sensings.When this first image sensing component 202 and this assist the visual angle of image sensing component 204 identical; And first image sensing component 202 is all identical with the field number of the picture element matrix of auxiliary image sensing component 204 field width identical and each field, and then this pixel distance d number n of equaling object 208 to be measured field of picture element matrix between the image space of the image space of first image 302 and assistant images 304 is multiplied by field width w.
In other embodiments of the invention; The focal length of this first image sensing component 202 and auxiliary image sensing component 204 also can be identical; For example when the focal length of this first image sensing component 202 be that f1 was should assist the focal length of image sensing component 204 to be f2 the time; Then can be according to the image space of this object 208 to be measured of the ratio correction between f2 and the f1 at this assistant images; For example according to the ratio between f2 and the f1 and the increase of equal proportion or reduce the image space of this object 208 to be measured, so can calculate this pixel distance d at the image space of this assistant images according to this object 208 to be measured this object 208 to be measured after the image space of this first image and aforementioned correction at this assistant images.
And if this first image sensing component 202 with visual angle that should auxiliary image sensing component 204 when inequality; Also can be according to this first image sensing component 202 and the image space of this object 208 to be measured of ratio correction that is somebody's turn to do the visual angle of assisting image sensing component 204 at this assistant images; For example according to the increase of this first image sensing component 202 equal proportion or reduce the image space of this object 208 to be measured at this assistant images with the ratio at visual angle that should auxiliary image sensing component 204, so can according to this object 208 to be measured after the image space of this first image and aforementioned correction this object 208 to be measured at this pixel distance of image space calculating d of this assistant images.
In addition when the field width of first image sensing component 202 and the picture element matrix of auxiliary image sensing component 204 not simultaneously; Then directly calculate this object 208 to be measured after the image space of this first image and this assistant images, two image spaces are subtracted each other to calculate this pixel distance d.
Parameters such as the focal length between first image sensing component 202 and auxiliary image sensing component 204, visual angle, pixel wide are not simultaneously; Only need should be obtained data by auxiliary image sensing component 204 with this first image sensing component 202 by standard correction in advance; Or obtained data by this first image sensing component 202 of standard correction with this auxiliary image sensing component 204; So can carry out the calculating of later pixels apart from d; And these bearing calibrations also belong to and know art of the present invention and extensively know, therefore promptly do not add to give unnecessary details at this.
Please with reference to Fig. 4 A and Fig. 4 B, Fig. 4 A and Fig. 4 B are the synoptic diagram of the triangle relation between explanation first image sensing component 202, auxiliary image sensing component 204 and the object to be measured 208.Shown in Fig. 4 A, first image sensing component 202 is preset physical distance b apart with auxiliary image sensing component 204, and first image sensing component 202 and object to be measured 208 are at a distance of Z1, and auxiliary image sensing component 204 and object to be measured 208 be Z2 apart.If approximate distance Z is much larger than physical distance b, then Z1 and Z2 will be similar to approximate distance Z.Z2 among Fig. 4 A is moved to the left side of Z1, so that Z1 and Z2 intersect at the position of first image sensing component 202, then Fig. 4 A will be transformed into Fig. 4 B.Shown in Fig. 4 B, but according to triangle similar figures principle push type (1).Therefore, can obtain approximate distance Z by pixel distance d, physical distance b and focal distance f.
Wherein f is the focal length of first image sensing component 202, and b is the physical distance between first image sensing component 202 and the auxiliary image sensing component 204, and d is that pixel distance, n are that the number and the w of the field of picture element matrix is the width of the field of picture element matrix.
The also embodiment of Fig. 2, the focal length of its first image sensing component 202 is different with the focal length of auxiliary image sensing component 204, but the focal length of first image sensing component 202 becomes certain relation with the focal length of auxiliary image sensing component 204.Therefore, the embodiment of principle of operation and Fig. 2 is identical, repeats no more at this.
Please with reference to Fig. 5, Fig. 5 is the synoptic diagram that an also embodiment of the present invention explains optical touch screen system 500.Optical touch screen system 500 comprises guidance panel 502, first image sensing component 504, second image sensing component 506, auxiliary image sensing component 508, coordinate Calculation unit 510 and real shadow judging unit 512.Guidance panel 502 is in order to a plurality of objects to be measured contacts to be provided, and as shown in Figure 5, guidance panel 502 has two object O1 to be measured, O2, but the embodiment of Fig. 5 is not limited to two objects to be measured.First image sensing component 504 is in order to obtain first image of the image that comprises two object O1 to be measured, O2 on the guidance panel 502.Second image sensing component 506 is in order to obtain second image of the image that comprises two object O1 to be measured, O2 on the guidance panel 502.Auxiliary image sensing component 508 is the assistant images that comprise the image of at least one destination object among two object O1 to be measured, the O2 on the guidance panel 502 in order to obtain; And first image sensing component 504 and the preset apart physical distance b1 of auxiliary image sensing component 508; And first image sensing component 504 is identical with the focal length of auxiliary image sensing component, is all f1.In the embodiment of Fig. 5, destination object is to be O1, is O1 but the present invention is not limited to destination object.Coordinate Calculation unit 510 is to be coupled to first image sensing component 504 and second image sensing component 506; In order to according to two object O1 to be measured, the image space of O2 on first image and second image, calculate two object O1 to be measured of the coordinate that comprises destination object (O1), a plurality of candidate's coordinates of O2.Real shadow judging unit 512 is to be coupled to first image sensing component 504 and auxiliary image sensing component 508; In order to calculating destination object (O1) at the image space of first image and the pixel distance d1 between the image space of destination object at assistant images, and with the approximate distance Zt (approximate distance Zt is much larger than physical distance b1) between pixel distance d1, physical distance b1, focal distance f 1 substitution formula (1) calculating destination object and first image sensing component 502.Then, according to approximate distance Zt, a selected coordinate is as the coordinate of destination object (O1) from a plurality of candidate's coordinates.Wherein first image sensing component 504 is identical with the visual angle of auxiliary image sensing component 508, and first image sensing component 504 is the same corners that are positioned at guidance panel 502 with auxiliary image sensing component 508; First image sensing component 504 is all identical with the field number of the picture element matrix of auxiliary image sensing component 508 field width identical and each field.In addition, according to the same concept of Fig. 3, can know that pixel distance d1 equals destination object (O1) to be multiplied by field width w1 in the number n 1 of the field of the image space of first image and the picture element matrix between the image space of destination object (O1) at assistant images.
In addition; The position of first image sensing component 504 and second image sensing component 506 is two different corners that are positioned at guidance panel 502; And coordinate Calculation unit 510 utilizes the triangle locator meams to calculate object O1 to be measured, O2 a plurality of candidate's coordinates on guidance panel 502 according to object O1 to be measured, the information that image space obtained of O2 on first image and second image.
The also embodiment of Fig. 5, the focal length of its first image sensing component 504 is different with the focal length of auxiliary image sensing component 508, but the focal length of first image sensing component 504 becomes certain relation with the focal length of auxiliary image sensing component 508.Therefore, the embodiment of principle of operation and Fig. 5 is identical, repeats no more at this.
Please with reference to Fig. 6, Fig. 6 is the synoptic diagram that an also embodiment of the present invention explains optical touch screen system 600.Optical touch screen system 600 comprises guidance panel 602, first image sensing component 604, second image sensing component 606, auxiliary image sensing component 608, coordinate Calculation unit 610, real shadow judging unit 612 and the 3rd image sensing component 614.The difference of optical touch screen system 600 and optical touch screen system 500 be optical touch screen system more than 600 the 3rd image sensing component 614 in order to obtain the 3rd image of the image that comprises a plurality of object O1 to be measured, O2 on the guidance panel 602, wherein the position that belongs to of the 3rd image sensing component 614 and first image sensing component 604 and second image sensing component 606 is different.And coordinate Calculation unit 610 is to be coupled to first image sensing component 604, second image sensing component 606 and the 3rd image sensing component 614; In order to according to a plurality of object O1 to be measured, the image space of O2 on first image, second image and the 3rd image, utilize the triangle locator meams to calculate a plurality of candidate's coordinates of a plurality of object O1 to be measured, O2.In addition, all the other principle of operation of optical touch screen system 600 are all identical with optical touch screen system 500, repeat no more at this.
The also embodiment of Fig. 6, the focal length of its first image sensing component 604 is different with the focal length of auxiliary image sensing component 608, but the focal length of first image sensing component 604 becomes certain relation with the focal length of auxiliary image sensing component 608.Therefore, the embodiment of principle of operation and Fig. 6 is identical, repeats no more at this.
Please with reference to Fig. 7, Fig. 7 is that the present invention goes back the process flow diagram that an embodiment explains a kind of method of optical touch range finding.The method of Fig. 7 is that details are as follows for its step through optical touch screen system shown in Figure 5 500 explanations:
Step 70: beginning;
Step 72: first image and second image that primary importance and second image sensing component 506 the second place in guidance panel 502 of first image sensing component 504 in guidance panel 502 obtained the image that comprises a plurality of object O1 to be measured, O2 respectively, wherein primary importance and the second place are to be arranged in the different corner of guidance panel 502;
Step 74: auxiliary image sensing component 508 is obtaining the assistant images that comprises the image of destination object (O1) among a plurality of object O1 to be measured, the O2 with primary importance at a distance of the aided location of physical distance b1, and wherein the focal length of auxiliary image sensing component 508 is identical with the focal length of first image sensing component 504;
Step 76: coordinate Calculation unit 510 is according to a plurality of object O1 to be measured, the image space of O2 in first image and second image, and calculating comprises the object O1 a plurality of to be measured of destination object (O1), a plurality of candidate's coordinates of O2;
Step 78: real shadow judging unit 512 is selected the coordinate of a coordinate as destination object (O1) according to image space, primary importance and the aided location of destination object (O1) in first image and assistant images physical distance b1 and focal distance f 1 apart from a plurality of candidate's coordinates;
Step 80: finish.
In step 72,74; First image sensing component 504 is to obtain first image and assistant images with same view angle with auxiliary image sensing component 508, and first image sensing component 504 is the same corners that are positioned at guidance panel 502 with auxiliary image sensing component 508.In addition, the horizontal number of pixels of first image and assistant images is identical, and the width of each pixel in first image and the assistant images is all identical.In step 76; Coordinate Calculation unit 510 utilizes the triangle locator meams to calculate a plurality of object O1 to be measured, O2 a plurality of candidate's coordinates on guidance panel 502 according to a plurality of object O1 to be measured, the information that image space obtained of O2 on first image and second image.In step 78, real shadow judging unit 512 obtains pixel distance d1 according to the image space of destination object (O1) in first image and assistant images; Then, pixel distance d1, physical distance b1, focal distance f 1 substitution formula (1) are calculated the approximate distance Zt between the destination object and first image sensing component 502.Then, according to approximate distance Zt, a selected coordinate is as the coordinate of destination object (O1) from a plurality of candidate's coordinates.
In sum; The method of optical range judgment means provided by the present invention, optical touch screen system and optical touch range finding; Utilize auxiliary image sensing component to arrange in pairs or groups image that first image sensing component obtained, and judge the approximate distance between the object to be measured and first image sensing component according to triangle similar figures principle.According to the approximate distance between the object to be measured and first image sensing component, real shadow judging unit can be judged by the coordinate Calculation unit according to the ghost coordinate in a plurality of candidate's coordinates that image space produced of a plurality of objects to be measured on first image and second image.Therefore; The method of optical range judgment means provided by the present invention, optical touch screen system and optical touch range finding can solve existing optical touch technology under the multi-point touch situation, and the common structure intersection point that forms because many light paths are blocked causes the problem of ghost touch point.
The above is merely the preferred embodiments of the present invention, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (14)
1. optical range judgment means comprises:
First image sensing component is in order to obtain first image of the image information that comprises object;
This optical range judgment means is characterised in that also and comprises:
Auxiliary image sensing component, in order to obtaining the assistant images of the image information that comprises this object, and this first image sensing component with should auxiliary image sensing component at a distance of preset physical distance; And
Apart from judging unit; Calculate the pixel distance of this object, and calculate the approximate distance between this object and this first image sensing component according to the focal length of this pixel distance, this physical distance and this first image sensing component and the focal length of this auxiliary image sensing component at the image space of this first image and this assistant images.
2. optical range judgment means as claimed in claim 1; It is characterized in that; This first image sensing component is identical with the visual angle of being somebody's turn to do auxiliary image sensing component; And this first image sensing component is all identical with the field number field width identical and each field of the picture element matrix that should assist image sensing component, and this pixel distance representes that promptly this object residing field number apart in this first image and this assistant images is multiplied by the distance that this field width is obtained.
3. optical range judgment means as claimed in claim 1; It is characterized in that; The focal length of this first image sensing component is identical with the focal length that is somebody's turn to do auxiliary image sensing component; And the ratio of this focal length and this pixel distance is the ratio of rough approximate this physical distance and this approximate distance, and should promptly calculate this approximate distance between this object and this first image sensing component with the ratio of this focal length and this pixel distance through this physical distance apart from judging unit.
4. optical range judgment means as claimed in claim 1; It is characterized in that; When this first image sensing component and visual angle that should auxiliary image sensing component or focal length not simultaneously; Be the image space that standard correction should auxiliary this object that image sensing component is obtained then with this first image sensing component, or with this auxiliary image sensing component image space that is this first this object that image sensing component is obtained of standard correction.
5. optical touch screen system comprises:
Guidance panel is in order to provide a plurality of object contacts;
First image sensing component is in order to obtain first image of the image information that comprises these objects on this guidance panel;
Second image sensing component is in order to obtain second image of the image information that comprises these objects on this guidance panel;
This optical touch screen system is characterised in that also and comprises:
Auxiliary image sensing component, in order to obtaining the assistant images that comprises the image information of at least one destination object in these objects on this guidance panel, and this first image sensing component with should auxiliary image sensing component at a distance of preset physical distance;
The coordinate Calculation unit in order to according to the image space of these objects on this first image and this second image, calculates a plurality of candidate's coordinates of these objects that comprise this destination object; And
Real shadow judging unit; Calculate the pixel distance of this destination object, and from these candidate's coordinates, select the coordinate that coordinate is this destination object with the focal length that should assist image sensing component according to the focal length of this pixel distance, this physical distance and this first image sensing component at the image space of this first image and this assistant images.
6. optical touch screen system as claimed in claim 5; It is characterized in that; This first image sensing component is identical with the visual angle of being somebody's turn to do auxiliary image sensing component; And this first image sensing component is all identical with the field number field width identical and each field of the picture element matrix that should assist image sensing component, and this pixel distance representes that promptly this destination object residing field number apart in this first image and this assistant images is multiplied by the distance that this field width is obtained.
7. optical touch screen system as claimed in claim 5; It is characterized in that; The focal length of this first image sensing component is identical with the focal length that is somebody's turn to do auxiliary image sensing component; And the ratio of this focal length and this pixel distance is the ratio of the distance between rough approximate this physical distance and this destination object and this first image sensing component; And should promptly calculate the approximate distance between this destination object and this first image sensing component through this physical distance by reality shadow judging unit, and according to this approximate distance selected coordinate that coordinate is this destination object from these candidate's coordinates with the ratio of this focal length and this pixel distance.
8. optical touch screen system as claimed in claim 5; It is characterized in that; The position of this first image sensing component and this second image sensing component is in two different corners of this guidance panel; And this coordinate Calculation unit be with the triangle locator meams by the image space of these objects on this first image and this second image, calculate a plurality of candidate's coordinates of these objects.
9. optical touch screen system as claimed in claim 5; It is characterized in that; Also comprise the 3rd image sensing component; In order to obtain the 3rd image of the image information that comprises these objects on this guidance panel, this coordinate Calculation unit utilizes the triangle locator meams to calculate these candidate's coordinates of these objects then according to the image space of these objects on this first image, this second image and the 3rd image.
10. optical touch screen system as claimed in claim 5; It is characterized in that; When this first image sensing component and visual angle that should auxiliary image sensing component or focal length not simultaneously; Be the image space that standard correction should auxiliary this object that image sensing component is obtained then with this first image sensing component, or with this auxiliary image sensing component image space that is this first this object that image sensing component is obtained of standard correction.
11. the method for an optical touch range finding comprises:
The primary importance of different corners and the second place are obtained first image and second image of the image information that comprises a plurality of objects respectively in guidance panel;
The method of this optical touch range finding is characterised in that also and comprises:
Obtaining the assistant images that comprises the image information of at least one destination object in these objects with this primary importance at a distance of the aided location of physical distance, wherein is to obtain this first image and this assistant images respectively with the focal length of this first image sensing component and the focal length of this auxiliary image sensing component;
Calculate a plurality of candidate's coordinates of these objects that comprise this destination object according to the image space of these objects in this first image and this second image;
From these candidate's coordinates, selected the coordinate of a coordinate according to the focal length of image space, this primary importance and this aided location of this destination object in this first image and this assistant images this physical distance and this first image sensing component apart and focal length that should auxiliary image sensing component as this destination object.
12. method as claimed in claim 11 is characterized in that, be to obtain this first image and this assistant images with same view angle, and this first image is identical with the horizontal number of pixels of this assistant images, and the width of each pixel is all identical.
13. method as claimed in claim 11; It is characterized in that; It is the distance of calculating this destination object and this primary importance with following equation; The focal length of this first image sensing component is identical with the focal length that is somebody's turn to do auxiliary image sensing component, and from these candidate's coordinates, selectes the coordinate of a coordinate as this destination object by this:
Wherein:
Z is the distance between this destination object and this primary importance;
F is the focal length for obtaining employed this first image sensing component of this first image and this assistant images and should assisting image sensing component;
B is the physical distance between this primary importance and this aided location;
N is the number for this destination object image space pixel apart in this first image and this assistant images; And
W is the unit width for each pixel.
14. method as claimed in claim 11 is characterized in that, be with the triangle locator meams by the image space of these objects on this first image and this second image, calculate a plurality of candidate's coordinates of these objects.
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| CN105302283A (en) * | 2014-06-06 | 2016-02-03 | 洪水和 | Control system in projection mapping and control method thereof |
| CN106354593A (en) * | 2016-08-17 | 2017-01-25 | 青岛海信电器股份有限公司 | Light path detecting method and device |
| CN109407901A (en) * | 2018-10-12 | 2019-03-01 | 黄河科技学院 | The external touch-control system of projector |
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| JP2006039755A (en) * | 2004-07-23 | 2006-02-09 | Fujitsu Component Ltd | Input device |
| WO2009139214A1 (en) * | 2008-05-12 | 2009-11-19 | シャープ株式会社 | Display device and control method |
| EP2177973A2 (en) * | 2008-10-17 | 2010-04-21 | Samsung Mobile Display Co., Ltd. | Touch screen display apparatus for performing flash mode and method of operating the apparatus |
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| JP2006039755A (en) * | 2004-07-23 | 2006-02-09 | Fujitsu Component Ltd | Input device |
| WO2009139214A1 (en) * | 2008-05-12 | 2009-11-19 | シャープ株式会社 | Display device and control method |
| EP2177973A2 (en) * | 2008-10-17 | 2010-04-21 | Samsung Mobile Display Co., Ltd. | Touch screen display apparatus for performing flash mode and method of operating the apparatus |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105302283A (en) * | 2014-06-06 | 2016-02-03 | 洪水和 | Control system in projection mapping and control method thereof |
| CN105302283B (en) * | 2014-06-06 | 2019-05-07 | 洪水和 | The control system and its control method of mapping projections |
| CN106354593A (en) * | 2016-08-17 | 2017-01-25 | 青岛海信电器股份有限公司 | Light path detecting method and device |
| CN109407901A (en) * | 2018-10-12 | 2019-03-01 | 黄河科技学院 | The external touch-control system of projector |
| CN109407901B (en) * | 2018-10-12 | 2021-11-23 | 黄河科技学院 | External touch system of projector |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102314263B (en) | 2014-02-19 |
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