CN105320362A - Method for judging touch object contacting touch operation area and optical touch system thereof - Google Patents
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Abstract
A method for judging whether a touch object contacts a touch operation area comprises the following steps: arranging a light-emitting element in a touch operation area; arranging an image acquisition device in the touch operation area to acquire an image of a touch object; arranging an optical reflector in the touch operation area to reflect the light emitted by the light-emitting element to the image acquisition device; and after an image processing device obtains the image, obtaining a first image capturing path and a second image capturing path according to the image, obtaining an inclination angle of the touch object in the touch operation area according to a first surge signal and a second surge signal of the touch object in the first image capturing path and the second image capturing path, obtaining a threshold value corresponding to the inclination angle, and comparing the first surge signal with the threshold value to determine whether a touch point of the touch object exists.
Description
Technical field
The present invention relates to a kind of optical touch control system and method thereof, relate to a kind of method and the optical touch control system thereof that judge touch control object contact touch control operation district especially.
Background technology
With regard to reflecting type optical touch control system now, after light-emitting component transmitting illuminant, caught the light signal (being also called signal of video signal) of current environment by image acquisition device, system judges whether there is touch point with touch control operation district according to the reflected light path of touch control object.But, judging in the process whether touch point exists, usually can set the threshold value (being also called Tss) of a signal of video signal intensity.When the signal of video signal intensity in signal of video signal with certain section is higher than Tss, system just can judge that touch point exists, as shown in Figure 1.
When touch control object contact touch control operation district, due to the principle of reflection of optics, touch control object can reflect the light path of its touch control object front end of all processes, in signal of video signal, thus form one section of surge signal raised up (i.e. touch control object reflection source formed phenomenon).The existence of touch point can be judged whether by comparing this surge signal and Tss.But in the application of reality, the power (i.e. the height of surge signal projection) of surge signal can be subject to the impact that touch control object contacts this touch control operation district angle, as shown in Fig. 2 A ~ 2B.
When touch control object 210 is irradiated by light-emitting component 230 on the same touch point A in touch control operation district 220, light path can cause light path to reflect back into the quantity of image acquisition device 240 because the angle of inclination of touch control object 210 is different also not identical, forms different surge signal intensity.Find in practical operation and after measuring, when touch control object 210 is 90 degree with the angle in touch control operation district 220, have the surge signal that intensity is stronger, as shown in Figure 2 A.Otherwise, when touching thing 210 and touch control operation district 220 angle more hour, the intensity of surge signal is then more weak, as shown in Figure 2 B.In fig. 2b, the intensity because of surge signal cannot reach the threshold value of Tss, and system will judge that the touch point of touch control object 210 in touch control operation district 220 does not exist.If Tss value to be set as a comparatively low threshold value, the slight interference of noise or environment is easily mistaken for touching signals by too low Tss value.Therefore, in practice, if use single fixing Tss value, then the inconvenience that said circumstances uses can be caused.
Therefore, one is needed to judge that a touch control object contacts method and the optical touch control system thereof in a touch control operation district, to solve the problem that single Tss value brings inconvenience.
Summary of the invention
The present invention proposes the method that a kind of judgement one touch control object contacts a touch control operation district, and said method comprises: arrange a plurality of light-emitting component in order to transmitting illuminant in a touch control operation district, one image acquisition device is set in above-mentioned touch control operation district, in order to gather the image that a touch control object is formed, arrange at least one optical reflector in above-mentioned touch control operation district, the light in order to be sent by above-mentioned light-emitting component reflexes to above-mentioned image acquisition device, and after obtaining above-mentioned image by an image processor by above-mentioned image acquisition device, one first capture path and one second capture path is obtained according to above-mentioned image, and according to one first surge signal of above-mentioned touch control object in above-mentioned first capture path and above-mentioned second capture path and one second surge signal, obtain the angle of inclination of above-mentioned touch control object in above-mentioned touch control operation district, and by obtaining the threshold value at a corresponding above-mentioned angle of inclination in a storage module, more above-mentioned first surge signal and above-mentioned threshold value are to determine whether a touch point of above-mentioned touch control object exists.
In certain embodiments, said method is before the above-mentioned first capture path of taking-up and above-mentioned second capture path, further comprising the steps of: to be a signal of video signal be made up of a plurality of capture path by above-mentioned image processor by above-mentioned video conversion, and select the strongest capture path of a signal of video signal as above-mentioned first capture path.In certain embodiments, the second capture path and above-mentioned first capture path are at a distance of a predeterminable range.In certain embodiments, after above-mentioned image acquisition device obtains above-mentioned image, further comprising the steps of: to judge that whether above-mentioned touch control object is close to above-mentioned touch control operation district by above-mentioned image processor according to a noise threshold value.In certain embodiments, said method also comprises: store a threshold value table of comparisons by a storage module; Wherein the above-mentioned threshold value table of comparisons is in order to note down the corresponding relation of differing tilt angles and threshold value.In certain embodiments, above-mentioned image is a bidimensional image, and above-mentioned signal of video signal is an one dimension signal of video signal.In certain embodiments, above-mentioned angle of inclination is an angle in above-mentioned touch control object and above-mentioned touch control operation district.
The present invention proposes a kind of optical touch control system, comprising: a touch control operation district, a plurality of light-emitting component, an image acquisition device, at least one optical reflector and an image processor.Above-mentioned a plurality of light-emitting component is the periphery being arranged at above-mentioned touch control operation district, in order to transmitting illuminant.Above-mentioned image acquisition device is the periphery being arranged at above-mentioned touch control operation district, in order to gather the image that a touch control object is formed.Above-mentioned at least one optical reflector is the periphery being arranged at above-mentioned touch control operation district, and the light in order to be sent by above-mentioned light-emitting component reflexes to above-mentioned image acquisition device.Above-mentioned image processor is coupled to above-mentioned image acquisition device, after obtaining above-mentioned image by above-mentioned image acquisition device, one first capture path and one second capture path is obtained according to above-mentioned image, and one first surge signal formed in above-mentioned first capture path and above-mentioned second capture path according to above-mentioned touch control object and one second surge signal, obtain above-mentioned touch control object in an angle of inclination in above-mentioned touch control operation district, and by obtaining the threshold value at a corresponding above-mentioned angle of inclination in a storage module, more above-mentioned first surge signal and above-mentioned threshold value are to determine whether a touch point of above-mentioned touch control object exists.
In certain embodiments, above-mentioned image processor is before the above-mentioned first capture path of taking-up and above-mentioned second capture path, be a signal of video signal be made up of a plurality of capture path by above-mentioned video conversion, and select the strongest capture path of a signal of video signal as above-mentioned first capture path.In certain embodiments, above-mentioned second capture path and above-mentioned first capture path are at a distance of a predeterminable range.In certain embodiments, after above-mentioned image acquisition device obtains above-mentioned image, according to a noise threshold value, above-mentioned image processor also judges that whether above-mentioned touch control object is close to above-mentioned touch control operation district.In certain embodiments, above-mentioned image processor also comprises: above-mentioned storage module, stores a threshold value table of comparisons; Wherein the above-mentioned threshold value table of comparisons is in order to note down the corresponding relation of differing tilt angles and threshold value.In certain embodiments, above-mentioned image is a bidimensional image, and above-mentioned signal of video signal is an one dimension signal of video signal.In certain embodiments, above-mentioned angle of inclination is an angle in above-mentioned touch control object and above-mentioned touch control operation district.
For making above and other object of the present invention, feature and advantage can become apparent, cited below particularly go out preferred embodiment, and coordinate institute's accompanying drawings, be described in detail below.
Accompanying drawing explanation
Fig. 1 is that display one touch point judges principle schematic.
Fig. 2 A ~ 2B is that display one touch control object is in the schematic diagram of a touch control operation district differing tilt angles.
Fig. 3 is the schematic diagram of the optical touch control system according to one embodiment of the invention.
Fig. 4 is the function block schematic diagram of the image processor of display according to one embodiment of the invention.
Fig. 5 A is the bidimensional image schematic diagram of display according to one embodiment of the invention.
Fig. 5 B is the one dimension signal of video signal schematic diagram of display according to one embodiment of the invention.
Fig. 6 is the method flow diagram that judgement one touch control object of display according to one embodiment of the invention contacts a touch control operation district.
Wherein, description of reference numerals is as follows:
Tss ~ affect signal intensity threshold value;
A ~ touch point;
210 ~ touch control object;
220 ~ touch control operation district;
230 ~ light-emitting component;
240 ~ image acquisition device;
300 ~ optical touch control system;
310 ~ touch control operation district;
322,324 ~ light-emitting component;
332,334 ~ image acquisition device;
340 ~ optical reflector;
350 ~ image processor;
352 ~ storage module;
354 ~ processing module;
500 ~ bidimensional image;
510 ~ the first capture paths;
520 ~ the second capture paths;
A ~ the first surge signal;
B ~ the second surge signal;
θ
ab~ angle;
600 ~ method flow diagram;
S605, S610, S615, S620, S625 ~ step.
Embodiment
In order to object of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly, and coordinate appended pictorial image 1 to Fig. 6, be described in detail.This instructions provides different embodiment so that the technical characteristic of different embodiment to be described.Wherein, the configuration of each element in embodiment is the use for explanation, and is not used to limit this case.And in embodiment, the part of reference numerals repeats, and is for the purpose of simplifying the description, not means the relevance between different embodiment.
Refer to Fig. 3, it is the schematic diagram of the optical touch control system 300 according to one embodiment of the invention.As shown in Figure 3, optical touch control system 300 includes a touch control operation district 310, light-emitting component 322 and 324, image acquisition device 332 and 334, at least one optical reflector 340, and an image processor 350.
Touch control operation district 310 carries out touch control operation with using a touch control object for user.Light-emitting component 322 and 324 is arranged at the periphery in touch control operation district 310, in order to transmitting illuminant.As shown in Figure 3, the setting position of light-emitting component 322 and 324 can distinguish corresponding image acquisition device 332 and 334.Image acquisition device 332 and 334 is the peripheries being arranged at touch control operation district 310, in order to gather the image that a touch control object is formed in a touch point (such as, a pointer, reflective pen).As shown in Figure 3, image acquisition device 332 and 334 can be arranged at the upper left corner and the upper right corner in touch control operation district 310 respectively, and its ornaments angle is for principle with the image that can gather touch control operation district 310.Optical reflector 340 is the peripheries being arranged at touch control operation district 310, and the light in order to be sent by light-emitting component 322 and 324 reflexes to image acquisition device 332 and 334.As shown in Figure 3, optical reflector 340 can be arranged at both sides and the base in touch control operation district 310, and optical reflector 340 is preferably single spectrum light transmissive material, mixed light material or reflectorized material formed.And light-emitting component 322 and 324 is preferably and sends invisible light, such as, infrared light, and image acquisition device 332 and 334 is collection one bidimensional images, it can be invisible light image, such as, infrared light image.
Then, refer to Fig. 4, it is the function block schematic diagram of the image processor 350 of Fig. 3.Image processor 350 is arranged in touch control operation district 310 to be coupled to image acquisition device 332 and 334.As shown in Figure 4, image processor 350 comprises storage module 352 and a processing module 354, and wherein image processor 350 can be a hardware, a software or a firmware, to carry out the image calculation process of being correlated with.Storage module 352 stores a threshold value table of comparisons, in order to note down touch control object corresponding relation of differing tilt angles and threshold value on each touch point in touch control operation district 310.
First, processing module 354 obtains an image by image acquisition device 332 and 334, and wherein above-mentioned image is a bidimensional image.According to a noise threshold value, processing module 354 first judges that whether above-mentioned touch control object is close to touch control operation district 310.If when processing module 354 judges above-mentioned touch control object not close to touch control operation district 310, then assert that this image formed by noise, therefore subsequent treatment is not done to this image.If when processing module 354 judges above-mentioned touch control object close to touch control operation district 310, utilize a switch technology above-mentioned bidimensional image to be converted to a signal of video signal be made up of a plurality of capture path, and select the strongest capture path of a signal of video signal as one first capture path.Processing module 354 is then set to one second capture path by with the first capture path at a distance of the capture path of a predeterminable range.Then, processing module 354 is according to first surge signal of touch control object in the first capture path and the second capture path and one second surge signal, obtain touch control object in an angle of inclination in touch control operation district 310, wherein angle of inclination is an angle in touch control object and touch control operation district 310.The threshold value table of comparisons of processing module 354 again stored by storage module 352 obtains the threshold value at a corresponding above-mentioned angle of inclination.Finally, the threshold value at more above-mentioned first surge signal of processing module 354 and corresponding above-mentioned angle of inclination is to determine whether a touch point of above-mentioned touch control object exists.
Illustrate for an example, Fig. 5 A be an image acquisition device 332 and 334 gather the bidimensional image that a touch control object tilts to touch in touch control operation district.Above-mentioned bidimensional image utilizes a switch technology to be converted to an one dimension signal of video signal be made up of a plurality of capture path as shown in Figure 5 B by processing module 354.And select the strongest capture path of a signal of video signal as one first capture path 510.Processing module 354 is then set to one second capture path 520 by with the first capture path at a distance of the capture path of a predeterminable range.
Processing module 354 obtains the one first surge signal A of touch control object in the first capture path 510 and the second capture path 520 and the second surge signal B by the above-mentioned one dimension signal of video signal of process, and calculating obtains one first surge signal coordinate (Xa, and one second surge signal coordinate (Xb, Yb) Ya).Processing module 354 can utilize the angle theta in below formulae discovery first surge signal A and the second surge signal B line and touch control operation district 310
ab(namely touch control object is at the angle of inclination in touch control operation district):
But, process angle theta
abcomputing can waste much usefulness, based under the principle of linear scaling, the slope of the first surge signal A and the second surge signal B can be used to replace angle theta
abto avoid too much computing, its formula is | (Xa-Xb)/(Ya-Yb) |.
In addition, processing module 354 can precompute angle theta
absuitable threshold value Tss corresponding to each predetermined angle, and in the threshold value table of comparisons of record in storage module 352.For example, processing module 354 can in advance via the surge signal intensity that a software induction touch control object is the most weak during touch point inclination all angles in touch control operation district, respectively each angle of inclination is taken out to the surge signal intensity level (S00 ~ S90) of one group of reference, and the half defining its intensity is signal intensity threshold value Tss, its threshold value table of comparisons as shown in Table 1:
| θ ab | Surge signal intensity | Tss |
| 0 | S00 | S00/2 |
| 10 | S10 | S10/2 |
| 20 | S20 | S20/2 |
| 30 | S30 | S30/2 |
| 40 | S40 | S40/2 |
| 50 | S50 | S50/2 |
| 60 | S60 | S60/2 |
| 70 | S70 | S70/2 |
| 80 | S80 | S80/2 |
| 90 | S90 | S90/2 |
form 1
Form 1 is for touch control object is certain touch point (such as, a touch point A), and tilt 0≤θ
abthe surge signal intensity of≤90 each angles.In this example, the angle being only interval for 10 degree, and the threshold value Tss of each angle is the half of surge signal intensity.It should be noted, above-mentioned threshold value Tss can change with the demand of system, shown in the content being not limited to this case instructions.Be understandable that, form 1 only lists the local tables of single touch point, if angle of inclination be with 1 degree for least unit time, the form of each touch point will have 90 row and 3 hurdles, and each touch point is to there being respective form, not each touch point numerical value is in the table all identical.
Fig. 6 is the method flow diagram 600 that judgement one touch control object of display according to one embodiment of the invention contacts a touch control operation district, and the method is used for an optical touch control system.In step s 605, gather by an image acquisition device image that a touch control object formed in a touch control operation district.In step S610, judge that whether above-mentioned touch control object is close to above-mentioned touch control operation district by an image processor according to a noise threshold value.If image processor judges above-mentioned touch control object not close to ("No" in step S610) during above-mentioned touch control operation district, then flow process gets back to S605, the image new by above-mentioned image acquisition device Resurvey.
If image processor judges that above-mentioned touch control object is close to ("Yes" in step S610) during above-mentioned touch control operation district, in step S615, above-mentioned image processor obtains one first capture path and one second capture path according to above-mentioned image, and according to one first surge signal of above-mentioned touch control object in above-mentioned first capture path and above-mentioned second capture path and one second surge signal, obtain above-mentioned touch control object in an angle of inclination in above-mentioned touch control operation district.Then, in step S620, above-mentioned image processor is by the threshold value obtaining a corresponding above-mentioned angle of inclination in a storage module.Finally, in step S625, more above-mentioned first surge signal of above-mentioned image processor and above-mentioned threshold value are to determine whether a touch point of above-mentioned touch control object exists.
In sum, of the present inventionly judge that a touch control object contacts the method in a touch control operation district and optical touch control system thereof and can take two capture paths and distinguish whether touch control object tilts, and the angle of inclination different according to touch control object uses different threshold values.Therefore can solve touch control object under differing tilt angles bring the decision problem of touch point.
Above embodiment uses multiple angles to describe.Obvious teaching here can present in many ways, and any certain architectures disclosed in example or function are only a representational situation.According to teaching herein, anyly it will be understood by those skilled in the art that the content presented herein can independently utilize other certain patterns or comprehensive multiple pattern to present as difference.Illustrate, can certain device be utilized in accordance with mentioning any mode in above or realize someway.The enforcement of one device or a kind of execution of mode can with any other frameworks or functional, again or framework and functionally realize previously discussed that one or more are formal.
Those skilled in the art more can understand this describe various illustrative logical blocks, module, processor, device, circuit and algorithm steps and above disclosed various situation can electronics hardware (be such as used for the numerical digit that source code or other technologies design is implemented, analogy is implemented or both combinations), various forms of program or with instruction as the design code linked (being called " software " or " software module " for convenience in interior literary composition) or both combinations.For clearly demonstrating the interchangeability between this hardware and software, the descriptive element of multiple tool, square, module, circuit and step are functional based on it haply in above description.No matter this function presents with hardware or software form, by depending on the application-specific of filling on total system and design restriction.Those skilled in the art can be each application-specific and the function of description are realized in a variety of different ways, but this decision-making realized is not to be read as the scope disclosed by departing from herein.
In addition, multiple various illustrative logical blocks, module and circuit and the various situations disclosed by this may be implemented in integrated circuit (integratedcircuit, IC), access terminal, access point; Or performed by integrated circuit, access terminal, access point.Integrated circuit can by general service processor, digital signal processor (digitalsignalprocessor, DSP), ASIC(Application Specific Integrated Circuit) (applicationspecificintegratedcircuit, ASIC), field programmable gate array (fieldprogrammablegatearray, or other programmable logic devices FPGA), discrete gate (discretegate) or transistor logic (transistorlogic), discrete hardware component, electronic component, optical element, mechanical organ, or the design of any above combination is to complete the function described in this literary composition, and may perform be present in integrated circuit, outer or both actuating codes that all have of integrated circuit or instruction.General service processor may be microprocessor, but also may be any conventional processors, controller, microcontroller or state machine.Processor can be made up of the combination of computer equipment, such as: the combination of digital signal processor (DSP) and a micro computer, organize more micro computer, one group organize micro computer and a digital signal processor cores get or any other similar configuration at the most.
Disclosed by this any concrete order of program or the step of layering pure be the mode of a citing.Based on the preference in design, must recognize that the step of any concrete order in program or layering can be rearranged in the scope disclosed by this file.Therefore adjoint claim to a method presents the element of various step with an example sequence, also not should by this particular order of showing or stratum limit.
Do not imply the order of steps performed by any right of priority, priority ranking, each interelement precedence or method in order to the use of ordinal numbers such as " first ", " second " of modified elements in claim, and only distinguish the different elements with same names (there is different ordinal number) with making a check mark.
Although this exposure discloses as above to implement example; but itself and be not used to limit this case, any those skilled in the art, not departing from the spirit and scope of this exposure; when doing a little variation and retouching, the protection domain that the protection domain of therefore this case is worked as depending on accompanying claim is as the criterion.
Claims (16)
1. judge the method in touch control object contact touch control operation district, described method comprises:
In a touch control operation district, a plurality of light-emitting component is set in order to transmitting illuminant;
One image acquisition device is set in described touch control operation district, in order to gather the image that a touch control object is formed;
Arrange at least one optical reflector in described touch control operation district, the light in order to be sent by described light-emitting component reflexes to described image acquisition device; And
After obtaining described image by described image acquisition device, one first capture path and one second capture path is obtained according to described image by an image processor, and according to one first surge signal of described touch control object in described first capture path and described second capture path and one second surge signal, obtain the angle of inclination of described touch control object in described touch control operation district, and by obtaining the threshold value at a corresponding described angle of inclination in a storage module, more described first surge signal and described threshold value are to determine whether a touch point of described touch control object exists.
2. judge the method in touch control object contact touch control operation district as claimed in claim 1, wherein before the described first capture path of taking-up and described second capture path, further comprising the steps of:
Be a signal of video signal be made up of a plurality of capture path by described image processor by described video conversion, and select the strongest capture path of a signal of video signal as described first capture path.
3. judge the method in touch control object contact touch control operation district as claimed in claim 2, wherein said second capture path and described first capture path are at a distance of a predeterminable range.
4. judge the method in touch control object contact touch control operation district as claimed in claim 1, after wherein said image acquisition device obtains described image, further comprising the steps of:
Judge that whether described touch control object is close to described touch control operation district by described image processor according to a noise threshold value.
5. judge the method in touch control object contact touch control operation district as claimed in claim 1, also comprise:
A threshold value table of comparisons is stored by a storage module;
The wherein said threshold value table of comparisons is in order to note down the corresponding relation of differing tilt angles and threshold value.
6. judge the method in touch control object contact touch control operation district as claimed in claim 2, wherein said image is a bidimensional image, and described signal of video signal is an one dimension signal of video signal.
7. judge the method in touch control object contact touch control operation district as claimed in claim 1, wherein said angle of inclination is an angle in described touch control object and described touch control operation district.
8. judge the method in touch control object contact touch control operation district as claimed in claim 6, also comprise:
One first surge signal coordinate (Xa, Ya) and one second surge signal coordinate (Xb, Yb) is obtained according to described first surge signal and described second surge signal by described image processor, and described angle theta
abfor
9. an optical touch control system, comprising:
One touch control operation district;
A plurality of light-emitting component is the periphery being arranged at described touch control operation district, in order to transmitting illuminant;
One image acquisition device is the periphery being arranged at described touch control operation district, in order to gather the image that a touch control object is formed;
At least one optical reflector, be the periphery being arranged at described touch control operation district, the light in order to be sent by described light-emitting component reflexes to described image acquisition device; And
One image processor, be coupled to described image acquisition device, after obtaining described image by described image acquisition device, one first capture path and one second capture path is obtained according to described image, and according to one first surge signal of described touch control object in described first capture path and described second capture path and one second surge signal, obtain the angle of inclination of described touch control object in described touch control operation district, and by obtaining the threshold value at a corresponding described angle of inclination in a storage module, more described first surge signal and described threshold value are to determine whether a touch point of described touch control object exists.
10. optical touch control system as claimed in claim 9, wherein said image processor is before the described first capture path of taking-up and described second capture path, be a signal of video signal be made up of a plurality of capture path by described video conversion, and select the strongest capture path of a signal of video signal as described first capture path.
11. optical touch control systems as claimed in claim 10, wherein said second capture path and described first capture path are at a distance of a predeterminable range.
12. optical touch control systems as claimed in claim 9, after wherein said image acquisition device obtains described image, according to a noise threshold value, described image processor also judges that whether described touch control object is close to described touch control operation district.
13. optical touch control systems as claimed in claim 9, wherein said image processor also comprises:
Described storage module, stores a threshold value table of comparisons;
The wherein said threshold value table of comparisons is in order to note down the corresponding relation of differing tilt angles and threshold value.
14. optical touch control systems as claimed in claim 10, wherein said image is a bidimensional image, and described signal of video signal is an one dimension signal of video signal.
15. optical touch control systems as claimed in claim 9, wherein said angle of inclination is an angle in described touch control object and described touch control operation district.
16. optical touch control systems as claimed in claim 14, wherein said image processor obtains one first surge signal coordinate (Xa according to described first surge signal and described second surge signal calculating, and one second surge signal coordinate (Xb Ya), Yb), described angle theta
abfor
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| TWI547847B (en) | 2016-09-01 |
| CN105320362B (en) | 2018-02-23 |
| TW201604743A (en) | 2016-02-01 |
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