CN104699327A - Optical touch system and suspension judgment method thereof - Google Patents
Optical touch system and suspension judgment method thereof Download PDFInfo
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- CN104699327A CN104699327A CN201310659880.9A CN201310659880A CN104699327A CN 104699327 A CN104699327 A CN 104699327A CN 201310659880 A CN201310659880 A CN 201310659880A CN 104699327 A CN104699327 A CN 104699327A
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Abstract
The invention provides an optical touch system. The optical touch system comprises a touch surface, a plurality of image sensors, a calculating unit, and a judging unit, wherein the touch surface is used for interactive operation by an object; each image sensor is used for acquiring an image frame spanning the touch surface; the calculating unit is used for calculating the coordinates of the object and the operational depth of the object relative to each image sensor according to the corresponding image frame; when the coordinates are located within the operation range of one of the image sensors, and the operational depth of the object relative to the image sensor exceeds a depth threshold, the judging unit adds an accumulative number and carries out suspension judgment according to the accumulative number.
Description
Technical field
The present invention about a kind of input media, particularly about a kind of optical touch control system and the suspension determination methods thereof that judge short distance hoverheight.
Background technology
At present, computer software system gradually towards the future development of touch controls of can arranging in pairs or groups (touch control), form 8 system (Windows8system) of such as Microsoft.In order to the development of software of can arranging in pairs or groups, hardware peripheral device, such as display screen, must have corresponding function simultaneously.
General contact panel can divide into resistance-type, condenser type and optical touch control panel according to principle of induction; Wherein, although optical touch control panel can carry out multi-point touch, but have object masks (blocking) in addition and the problem of the judgement (hovering identification) that suspends.Generally speaking, when point close to but unactual touch contact panel time may be defined as suspended state, although described suspended state can operating function in order to increase beyond contact condition, however when finger is very close do not touch contact panel time, the situation that cannot judge may be there is.Therefore, how to increase and suspend the degree of accuracy that judges still as waiting one of problem of solution in optical touch control panel technology.
Summary of the invention
In view of this, the present invention also proposes a kind of optical touch control system and suspension determination methods thereof, according to the picture frame that multiple imageing sensor obtains, it confirms that touch point is suspension touch control point or contact touch point jointly.
The invention provides a kind of optical touch control system and suspension determination methods thereof, it can judge short distance hoverheight, and Corrected Depth threshold value can judge degree of accuracy to increase when multi-point touch.
The present invention also provides a kind of optical touch control system and suspension determination methods thereof, and it can judge short distance hoverheight, and can judge degree of accuracy according to the distance correction depth threshold of object and imageing sensor to increase.
The present invention also provides a kind of optical touch control system and suspension determination methods thereof, and it can judge short distance hoverheight, and can according to object be correlated with can operation sensor number Corrected Depth threshold value with increase judge degree of accuracy.
The invention provides a kind of optical touch control system, comprise touch surface, multiple imageing sensor, storage element, computing unit and judging unit.Described touch surface is in order to supply at least one object at the enterprising line operate of touch surface.Imageing sensor described in each is in order to obtain the picture frame across described touch surface.What described storage element stored at least one depth threshold described touch surface relative to imageing sensor described in each can opereating specification.Described computing unit is in order to the coordinate that calculates object described in each according to the described picture frame operational depth with relative imageing sensor described in each.Described judging unit in order to by be positioned to the described coordinate of object described in each each described in can the relevant described imageing sensor of opereating specification be defined as can operation sensor, relatively relevant described of accumulative object described in each can the described operational depth of the operation sensor number that exceedes described depth threshold be cumulative number, is judged as contact condition when described cumulative number exceedes accumulative threshold value.
The present invention also provides a kind of suspension determination methods of optical touch control system, and described optical touch control system comprises respectively in order to obtain the multiple imageing sensors across the picture frame of touch surface.Described suspension determination methods comprises the following step: the operational depth of the coordinate utilizing computing unit to calculate at least one object according to described picture frame and relative imageing sensor described in each; When described coordinate be positioned at the wherein one of described imageing sensor can opereating specification time, define described imageing sensor for can operation sensor; Utilize judging unit object described in each is correlated with described in can the described operational depth of operation sensor compare with at least one depth threshold; And the suspended state of object described in each can be judged by the described operational depth of the operation sensor cumulative number that exceedes described depth threshold described in being correlated with according to object described in each.
The present invention also provides a kind of optical touch control system, and this optical touch control system comprises touch surface, multiple imageing sensor, computing unit and judging unit.Described touch surface with for object at the enterprising line operate of touch surface.Imageing sensor described in each is in order to obtain the picture frame across described touch surface.Described computing unit is in order to the coordinate that calculates described object according to the described picture frame operational depth with relative imageing sensor described in each.Described judging unit in order to be positioned at when described coordinate the wherein one of described imageing sensor can opereating specification and the described operational depth of relatively described imageing sensor exceed depth threshold time increase cumulative number, and judge the mode of operation of described object according to described cumulative number.
In one embodiment, described accumulative threshold value relevant to each object can operation sensor number be correlated with, such as become positive correlation.
In one embodiment, described judging unit also calculates the shadow spacing of covering between shadow of multiple objects of each imageing sensor relatively, and described storage element stores the depth threshold of relatively different shadow spacing and described judging unit can select suitable depth threshold according to described shadow spacing.
In one embodiment, described judging unit also calculates the merging shadow number covering shadow of multiple objects of each imageing sensor relatively, and described storage element stores the depth threshold of relatively different merging shadow number and described judging unit can adjust described depth threshold according to described merging shadow number.
In one embodiment, described depth threshold relevant to each object can operation sensor number be correlated with, such as become positive correlation.
In one embodiment, described storage element stores multiple depth threshold, described depth threshold according to described can in opereating specification from the distance of relevant imageing sensor and different.
In the optical touch control system of the embodiment of the present invention and suspension determination methods thereof, what described judging unit first confirmed counterbody can operation sensor, then identify described can the operation sensor number of sensors that be detected as contact or suspend.When majority can operation sensor be detected as contact time judge described object be contact condition work as majority can operation sensor be detected as suspension time judge that described object is suspended state; Wherein, described number also can according to can the sum of operation sensor be adjusted, to increase judgement degree of accuracy.Therefore, do not need allly can operation sensor could to judge when being all identified as identical.
More obviously, hereafter can will coordinate appended diagram, be described in detail as follows to allow above and other object of the present invention, feature and advantage.In addition, in explanation of the present invention, identical component represents with identical symbol, illustrates in advance at this.
Accompanying drawing explanation
Fig. 1 shows the stereographic map of the optical touch control system of the embodiment of the present invention;
Fig. 2 shows the calcspar of the optical touch control system of the embodiment of the present invention;
Fig. 3 shows the schematic diagram of the operational depth calculating object in the optical touch control system of the embodiment of the present invention;
Fig. 4 A-4B shows in the optical touch control system of the embodiment of the present invention that determine can the schematic diagram of opereating specification;
What Fig. 5 A-5E showed the optical touch control system of the embodiment of the present invention can the schematic diagram of opereating specification;
Fig. 6 shows the operation chart of the optical touch control system of the embodiment of the present invention;
Fig. 7 shows the Detection Information of the optical touch control system counterbody of the embodiment of the present invention;
Fig. 8 shows the schematic diagram of the different depth threshold value of the optical touch control system of the embodiment of the present invention;
Fig. 9-10 shows another operation chart of the optical touch control system of the embodiment of the present invention;
The different depth threshold value that the storage element that Figure 11 shows the optical touch control system of the embodiment of the present invention prestores;
Figure 12 shows the process flow diagram of the suspension determination methods of the optical touch control system of the embodiment of the present invention.
Description of reference numerals
1 optical touch control system
10 touch surface
111-114 reflecting strips
121-124 imageing sensor
131-134 system source
14 computing units
15 judging units
16 storage elements
9 objects
Territory, B blind area
S21-S26 step
P0-P9 object
THa adds up threshold value
IF
1-IF
4picture frame
Hmin can detect minimum hoverheight
Compensate 1, compensate the adjusted value of 2 depth threshold
S
p12, S
p3, S
p4, S
p56, S
p789cover shadow
TH0, TH1, TH2, TH1
high,
TH2
high, TH1
low, TH2
lowdepth threshold.
Embodiment
Please refer to shown in Fig. 1, the stereographic map of the optical touch control system of its display embodiment of the present invention.The optical touch control system 1 of the present embodiment comprises touch surface 10, multiple reflecting strips (being shown as four reflecting strips 111-114 herein) and multiple imageing sensor (being shown as four imageing sensor 121-124 herein); Wherein, the number of imageing sensor and reflecting strips and configuration can be determined according to different application, are not limited to number that Fig. 1 discloses and configuration.Described optical touch control system 1 is in order to differentiate at least one object (such as, but be not limited to, at least one finger) be positioned at suspension procedure state above described touch surface 10 and operating of contacts state, and control electronic installation according to different operating state and perform different running; Wherein, electronic installation has been known according to the operational function of different operating state, therefore does not repeat them here.
Described reflecting strips 111-114 is preferably arranged at the edge of described touch surface 10 respectively to define the operating area in described touch surface 10, and in order to light that reflect ambient light or system source send.In one embodiment, described optical touch control system 1 can comprise at least one system source (such as showing four system source 131-134 herein) in order to the described reflecting strips 111-114 that throws light on; Wherein, described system source can be non-coherent light source (such as light-emittingdiode) or part people having the same aspiration and interest light source and sends invisible light.Should be noted that, although Fig. 1 shows described system source 131-134 adjacent described imageing sensor 121-124 and arranging respectively, it is also not used to limit the present invention.According to different application, setting position, the number of system source can not be identical with luminous frequency spectrum, there is no specific restriction.In addition, described system source is luminous with the Image Acquisition frequency of the corresponding described imageing sensor 121-124 of identical or different glow frequency, and different system light source can be luminous during difference according to the Image Acquisition of associated image sensor.
Described imageing sensor 121-124 such as comprises ccd image sensor, cmos image sensor or other optical sensors respectively.Described imageing sensor 121-124 in order to simultaneously or timesharing obtain picture frame across described touch surface 10 respectively, and described picture frame is better comprises at least one reflecting strips image.When at least one object 9 comes close to or in contact with described touch surface 10, imageing sensor 121-124 described in each can obtain the picture frame that described object 9 covers its reflecting strips of being correlated with within sweep of the eye.Should be noted that, though Fig. 1 shows four corners that described imageing sensor 121-124 is arranged at described touch surface 10, it is also not used to limit the present invention.In one embodiment, described optical touch control system 1 also can comprise two imageing sensors of the side being arranged at described reflecting strips 111 or 113.
Please refer to shown in Fig. 2, the block schematic diagram of the optical touch control system of its display embodiment of the present invention.The optical touch control system 1 of the present embodiment is shown as sensor array herein except described imageing sensor 121-124() except, also can comprise computing unit 14, judging unit 15 and storage element 16.In the present embodiment, described computing unit 14, judging unit 15 and storage element 16 can control wafer and realize and realize with software, hardware, firmware or its mode combined, and there is no specific restriction.
As previously mentioned, described imageing sensor 121-124 in order to simultaneously or timesharing obtain and output map picture frame IF
1-IF
4.Described computing unit 14 is in order to according to described picture frame IF
1-IF
4calculate the operational depth (after being illustrated in) of coordinate each imageing sensor relative to each object of each object; Also namely, described computing unit 14 can try to achieve operational depth respectively according to the picture frame of each object each imageing sensor relative, and such as now each object can try to achieve 4 operational depth.Described judging unit 15 in order to by be positioned to the coordinate of each object each can the relevant imageing sensor of opereating specification be defined as can operation sensor, what each object accumulative was relatively relevant the operational depth of operation sensor can exceed the cumulative number of at least one depth threshold, and is judged as contact condition when described cumulative number exceedes accumulative threshold value; In addition, described judging unit 15 also can calculate shadow spacing and/or merge shadow number, and selects accordingly and adjust described depth threshold, judges degree of accuracy so as to increasing.What described storage element 16 stored at least one depth threshold, at least one accumulative threshold value and the relatively described touch surface 10 of each imageing sensor in advance can opereating specification.
First, illustrate that described computing unit 14 is according to described picture frame IF
1-IF
4calculate the mode of the operational depth of each object each imageing sensor relative.Please refer to shown in Fig. 3, in boot program, each imageing sensor obtains picture frame using as with reference to picture frame; Wherein, described reference image frame is better does not comprise any subject image.If calculate the conjunction (sum) or average of each row grey decision-making of described reference image frame, then can obtain one dimension with reference to gray-scale distribution (being shown as solid line); Wherein, described one dimension is stored in described storage element 16 with reference to gray-scale distribution.In time operating, each imageing sensor obtains picture frame using as current picture frame; Wherein, described current picture frame inclusion volume image (as Fig. 3 center dant) is supposed.Equally by calculating the conjunction or average of every a line grey decision-making of described current picture frame, to obtain the current gray-scale distribution of one dimension (being shown as dotted line).Should be noted that, in Fig. 3, cover the region outside shadow, described with reference to gray-scale distribution roughly the same with described current gray-scale distribution, herein for clear display and by two distribution curves be separated.
In the present invention, the operational depth (depth) of object relative image sensor then can calculate by equation (1)
depth=max of（Ri-Ci）/Ri,i=1-n （1）
(1), in formula, Ri is one dimension each grey decision-making with reference to gray-scale distribution of reference image frame; Ci is each grey decision-making of the current gray-scale distribution of one dimension of current picture frame; N is the one dimension size (being herein row resolution) of picture frame; The present invention operational depth is defined as the maximal value of (1) formula and object space such as may be defined as the location of pixels of described maximal value.From (1) formula, object is the closer to described touch surface 10, and the numerical value of operational depth is higher; Wherein, operational depth is 0 when in the visual field that object does not enter imageing sensor, and described in object contact during touch surface 10 operational depth be 1.In addition, when calculating described operational depth, (1) formula can be utilized to calculate the grey decision-making of whole one dimension gray-scale distribution; Or, after first utilizing described one dimension first to calculate cover shadow scope with reference to gray-scale distribution and the current gray-scale distribution of described one dimension, described in recycling (1) formula calculates, cover the grey decision-making within the scope of shadow.Should be noted that, in the present invention, the account form of operational depth is not limited to utilize (1) formula to calculate, and such as, also the denominator in (1) formula can be taken away in an embodiment, only calculated difference.In another embodiment, formula that operational depth can be (1) is to the mean value of n.In other words, described operational depth can be tried to achieve according to the dimension gray-scale distribution of reference image frame and current picture frame.
Then, illustrate determine each imageing sensor relatively described touch surface 10 can the mode of opereating specification.In the present invention, described can opereating specification be better precalculates before optical touch control system 1 dispatches from the factory and be stored in described storage element 16.
Please refer to shown in Fig. 4 A and 4B, Fig. 4 A shows described touch surface 10 for operation chart during non-specular surface and the operation chart that Fig. 4 B shows described touch surface 10 when being minute surface; Wherein, only image taking sensor 121 and reflecting strips 113 are example explanation herein.The operational scenario of other imageing sensors and reflecting strips is similar.
As shown in Figure 4 A, when without any described in object proximity during touch surface 10, described imageing sensor 121 can get the whole reflecting strips image of described reflecting strips 113.The minimum hoverheight that detects of supposing the system is Hmin, such as 1mm herein.As shown in (1) formula, a part of reflecting strips image at least can be got due to imageing sensor 121 must be made during the calculating operation degree of depth, when object 9 is near imageing sensor 121 predeterminable range, even if described object 9 does not touch described touch surface 10, described imageing sensor 121 possibly cannot get the image of described reflecting strips 113, thus in described predeterminable range relatively described imageing sensor 121 belong to can not opereating specification and become territory, blind area (blind region).Therefore, in the present invention, when can detect minimum hoverheight Hmin described in being suspended in by object 9, gradually near described imageing sensor 121 until predeterminable range D1 when described imageing sensor 121 cannot get the image of described reflecting strips 113 is considered as territory, blind area, and by the scope definition beyond described predeterminable range D1 be described imageing sensor 121 can opereating specification.Can understand according to Fig. 4 A, described in described predeterminable range D1 depends on, minimum hoverheight Hmin and image analytic degree can be detected; Such as, when the size of described imageing sensor 121 discernible reflecting strips image is less, then the area in territory, blind area can be reduced.In addition, when described reflecting strips 113 non-immediate to be arranged in described touch surface 10 at a distance of a segment distance, then the area in territory, blind area can be increased.In other words, territory, blind area system by systematic parameter and described detect minimum hoverheight determine.
As shown in Figure 4 B, in order to the area that reduces territory, blind area can opereating specification to increase, described touch surface 10 can use minute surface, and therefore described imageing sensor 121 can obtain reflecting strips real image 113 and the reflecting strips virtual image 113 '.Whereby, as long as imageing sensor 121 can obtain a part of reflecting strips virtual image 113 ', described computing unit 14 can calculate described operational depth according to (1) formula, and the area that therefore significantly can reduce territory, blind area can opereating specification, i.e. D2<D1 to increase.
According to said method, before described optical touch control system 1 dispatches from the factory, can calculate for each imageing sensor can opereating specification, hatched example areas as shown in figs. 5 a-5d.Fig. 5 E shows opereating specification can be overlapped in the situation of described touch surface 10 shown in Fig. 5 A-5D simultaneously.For ease of illustrating, Fig. 5 E shows territory, blind area B, and when object is positioned at described blind area territory B, all imageing sensor 121-124 all cannot detect the mode of operation of described object.Therefore, preferably make that described touch surface 10 does not exist territory, any blind area when designing.
Please refer to shown in Fig. 6, the embodiment of the mode of operation of described judging unit 15 judgment object is then described.Now suppose single object P0 obtain by described imageing sensor 121-124.Described imageing sensor 121-124 obtains and output map picture frame IF respectively
1-IF
4to described computing unit 14.
Described computing unit 14 is according to described picture frame IF
1-IF
4calculate the coordinate of the relatively described touch surface 10 of described single object P0; Wherein, the mode of the coordinate of object is calculated for known according to the picture frame that multiple imageing sensor obtains, the such as prior two-dimensional space field range of multiple imageing sensor being mapped the relatively described touch surface 10 of (mapping) one-tenth, then can calculate the object coordinates of relatively described two-dimensional space according to picture frame.Described computing unit 14 is also according to described image IF
1-IF
4(1) formula calculates the operational depth of relative each imageing sensor 121-124 of described object P0.Described coordinate and described operational depth information are also sent to described judging unit 15 by described computing unit 14.
What described judging unit 15 first judged whether described coordinate be positioned at described imageing sensor 121-124 can opereating specification, and what the coordinate that such as Fig. 6 shows described object P0 was positioned at described imageing sensor 121 can opereating specification.Please refer to shown in Fig. 7, suppose described judging unit 15 judge the coordinate of described object P0 lay respectively at described imageing sensor 121-123 can opereating specification (being shown as " Y ") but be not positioned at described imageing sensor 124 can opereating specification (being shown as " N "), therefore the relatively described object P0 of described imageing sensor 121-123 be defined as can operation sensor and the relatively described object P0 of described imageing sensor 124 be not defined as can operation sensor.
Then, described judging unit 15 more described object P0 does not compare relative to the operational depth of the operational depth of each imageing sensor 121-123 described imageing sensor 124 relative to the depth threshold TH0(being pre-stored in described storage element 16), suppose that operational depth that described judging unit 15 tries to achieve the relatively described imageing sensor 121,123 of described object P0 exceedes described depth threshold TH0(and is shown as " Y " herein) and the operational depth of relatively described imageing sensor 122 is less than described depth threshold TH0(is shown as " N ").Therefore, described judging unit 15 can in order to be positioned at when described coordinate the wherein one of described imageing sensor can opereating specification and the described operational depth of relatively described imageing sensor exceed depth threshold time increase cumulative number; Also be, when secondary series and three row are shown as " Y " simultaneously in Fig. 7, cumulative number is added 1, such as now described cumulative number is 2.In other words, described judging unit 15 judges the relatively described imageing sensor 121 of described object P0 with 123 as touching state and relative described imageing sensor 122 and 124 are not touching state.Should be noted that, the numerical value shown in Fig. 7 and state are only illustration, and are not used to limit the present invention.
Finally, described judging unit 15 judges the mode of operation of described object P0 according to described cumulative number.Such as, when described cumulative number exceedes accumulative threshold value THa, described judging unit 15 judges that described object P0 opposing optical touch-control system 1 works as described cumulative number when not exceeding described accumulative threshold value THa as contact condition, and described judging unit 15 judges that described object P0 opposing optical touch-control system 1 is as suspended state.In more detail, in order to increase the judgement degree of accuracy of short distance suspended state, described judging unit 15 carrys out the mode of operation of judgment object according to the synthesis result of all imageing sensors, and when the imageing sensor exceeding preset number is detected as touching state, identify that described object P0 is touching state just now, and also the testing result of not according to single image sensor judges.
In addition, be subject to modulation transfer function (the modulation transfer function of image sensor lens, MTF) impact, when object at a distance of described touch surface 10 phase co-altitude and range image sensor distance is far away time, described computing unit 14 try to achieve the value of the operational depth of (such as according to (1) formula) can be less.Therefore, in order to increase correct judgment, the better basis of described depth threshold TH0 can in opereating specification with the distance of the imageing sensor of being correlated with and different.Such as please refer to shown in Fig. 8, in described storage element 16, multiple depth threshold (such as TH0-TH2) can be stored, wherein said depth threshold can according to described can (hatched example areas) and the distance of imageing sensor 121 and different in opereating specification.In the present embodiment, far away apart from the distance of described imageing sensor 121, less depth threshold can be selected, such as TH0>TH1>TH2.Scrutable, the number of depth threshold is not defined as 3, and it such as can determine according to the size of described touch surface 10 and system requirements.
As previously mentioned, because described judging unit 15 to carry out the mode of operation of judgment object according to the synthesis result of all imageing sensors, when counterbody can the number of operation sensor lower time, can foundation cumulative number then relatively low (due to do not belong to can the depth information of operation sensor be not considered).Therefore, for avoiding erroneous judgement, what described accumulative threshold value THa was relevant to each object the number of operation sensor can become positive correlation; Also namely, when can the number of operation sensor higher time, higher accumulative threshold value THa can be selected, and when can the number of operation sensor lower time, less accumulative threshold value THa can be selected.In other words, described storage element 16 can in prestore different accumulative threshold value THa, what described judging unit 15 can be correlated with according to each object the number of operation sensor can select suitable accumulative threshold value THa, judges degree of accuracy so as to increasing.
In like manner, when relative each object can the number of operation sensor lower time, described relevant to each object of described depth threshold TH0 also can be made the number of operation sensor can to become positive correlation; Also namely, when can the number of operation sensor higher time, higher depth threshold TH0 can be selected, and when can the number of operation sensor lower time, lower depth threshold TH0 can be selected.In other words, described storage element 16 can in prestore different depth threshold.Such as, show in Figure 11 in described storage element 16 and store first group of depth threshold TH0, TH1, TH2 and second group of depth threshold TH0, TH1
low, TH2
low; Wherein, TH1>TH1
lowand TH2>TH2
low.When relative each object can the number of operation sensor higher time can select described first group of depth threshold and when can the number of operation sensor lower time can select described second group of depth threshold.
In addition, when multiple object (object P1 and P2 as Fig. 6) simultaneously by as described in imageing sensor 121-124 obtain time, described optical touch control system 1 can utilize the above-mentioned step about single object to carry out the judgement of mode of operation respectively for each object P1 and P2.Such as, described computing unit 14 receives described picture frame IF
1-IF
4after, then according to described picture frame IF
1-IF
4calculate the operational depth of coordinate each imageing sensor (121-124) relative to each object of each object (P1 with P2) respectively; Be now such as Two coordinate and 8 operational depth.Described judging unit 15 for each object P1 with P2 all set up out as Fig. 7 Detection Information with demonstrate each object P1 with P2 corresponding can operation sensor (i.e. coordinate be positioned at can opereating specification), detect contact can the cumulative number (what namely operational depth was greater than depth threshold can operation sensor) of operation sensor and mode of operation (namely comparing cumulative number and accumulative threshold value).In other words, the number of the Detection Information (i.e. Fig. 7) set up is same as the number of object.
In addition, for avoiding erroneous judgement, when multiple object is obtained by described imageing sensor 121-124 simultaneously, and multiple objects of the merging shadow of relatively same imageing sensor at least wherein be positioned at described same imageing sensor can opereating specification outer time, the relatively described object of described imageing sensor is not defined as can operation sensor.Such as, in Fig. 6, the relative described imageing sensor 121 of described object P1 with P2 produces and merges shadow S
p12simultaneously described object P1 be positioned at described imageing sensor 121 can the outer and described object P2 of opereating specification be positioned at described imageing sensor 121 can opereating specification, now described judging unit 15 is in time setting up the Detection Information as Fig. 7, and relatively described object P1 and P2 of described imageing sensor 121 is not all defined as can operation sensor.
Please refer to shown in Fig. 9, be subject to the impact of the modulation transfer function of image sensor lens, when relative two articles cover shadow closer to each other time, the operational depth that described computing unit 14 calculates can increase.Therefore, judge degree of accuracy for promoting, described judging unit 15 also calculates the shadow spacing of covering between shadow of multiple objects of each imageing sensor relatively, and such as counterbody P3's covers shadow S
p3with counterbody P4 cover shadow S
p4between distance.Described storage element 16 stores the depth threshold of relatively different shadow spacing, such as, show in Figure 11 in described storage element 16 store first group of depth threshold TH0, TH1, TH2 with the 3rd group of depth threshold TH0, TH1
high, TH2
high; Wherein, TH1
high>TH1 and TH2
high>TH2.Described first group of depth threshold can be selected when shadow spacing is more than or equal to spacing threshold and described 3rd group of depth threshold can be selected when shadow spacing is less than spacing threshold, to get rid of the impact of the modulation transfer function of camera lens.
Please refer to shown in Figure 10, when the shadow spacing of covering between shadow of relative multiple objects of each imageing sensor narrow down to become merge shadow time, same because the impact of the modulation transfer function of camera lens, meeting and then increase the operational depth that described computing unit 14 calculates.When described judging unit 15 judge to exist merge shadow time, can percentage regulation threshold value once again.Therefore, described judging unit 15 also calculates the merging shadow number covering shadow of multiple objects of each imageing sensor relatively, and adjusts described depth threshold accordingly.When merging shadow number and being more, the amplitude of adjustment is larger.The relative described imageing sensor 121 of such as object P5 with P6 is formed and merges image S
p56and the relatively described imageing sensor 121 of object P7-P9 forms merging image S
p789.When described judging unit 15 judges the mode of operation of described object P5 and P6, can by depth threshold TH0, TH1
high, TH2
highrepair once again as TH0, TH1
high+ compensation 1, TH2
high+ compensate 1; When described judging unit 15 judges the mode of operation of described object P7-P9, can by depth threshold TH0, TH1
high, TH2
highrepair once again as TH0, TH1
high+ compensation 2, TH2
high+ compensate 2 or TH0, TH1
high+ N × compensation 1, TH2
high+ N × compensation 1, to get rid of the impact of the modulation transfer function of camera lens.
In above-described embodiment, only to revise in one group of depth threshold two less depth threshold, this is because the numerical value of depth threshold TH0 own is close to detecting minimum hoverheight Hmin, therefore need not revise further.But in other embodiments, according to the numerical value of original start, all depth threshold all can be revised.
Please refer to shown in Figure 12, the process flow diagram of the suspension determination methods of the optical touch control system of its display embodiment of the present invention, it comprises the following step: obtain picture frame (step S with each imageing sensor
21); Operational depth (the step S of the coordinate utilizing computing unit to calculate at least one object according to described picture frame and relative imageing sensor described in each
22); When described coordinate be positioned at the wherein one of described imageing sensor can opereating specification time, define described imageing sensor for can operation sensor (step S
23); Utilize judging unit to compare object described in each is correlated with described can the described operational depth of operation sensor and at least one depth threshold (step S
24); So that suspended state (the step S of object described in each can be judged by the described operational depth of the operation sensor cumulative number that exceedes described depth threshold described in relevant with according to object described in each
25).As previously mentioned, because different shadow states of covering can affect the operational depth that described computing unit 14 tries to achieve, the therefore better step S separately comprising percentage regulation threshold value
26.In addition, due to described storage element 16 can store can distance is relevant in opereating specification multiple depth threshold (as shown in Figure 8), therefore in step S
24when comparing, described judging unit 15 can be positioned at and can opereating specification compare to the distance selected depth threshold value of relevant imageing sensor again according to the coordinate of object.
Please refer to Fig. 1-2,6-10 and 12, the embodiment of the suspension determination methods of the present embodiment is then described.
Step S
21: described imageing sensor 121-124 obtains picture frame IF respectively
1-IF
4and be sent to described computing unit 14.
Step S
22: described computing unit 14 is then according to described picture frame IF
1-IF
4calculate the operational depth of coordinate each imageing sensor relative at least one object 121-124 of at least one object, such as, utilize (1) formula.As previously mentioned, described computing unit 14 can try to achieve coordinate and multiple operational depth by each object relatively, and its number equals the number of imageing sensor.Described coordinate and operational depth are transferred into described judging unit 15.
Step S
23-S
24: when object (the object P0 of such as Fig. 6) be positioned at imageing sensor (imageing sensor 121 of such as Fig. 6) can opereating specification time, what described imageing sensor 121 is defined as relatively described object P0 can operation sensor, and more described object P0 relevant can the operational depth of operation sensor (such as Fig. 7 is shown as 121,122 and 123) and at least one depth threshold, and relatively described object P0 foundation is as the Detection Information of Fig. 7.When there is multiple object, object P1, P2 of such as Fig. 6, the object P5-P9 of object P3, P4 and Figure 10 of Fig. 9, described judging unit 15 all can set up the Detection Information of similar Fig. 7 relative to each object according to same way.
Step S
25: described judging unit 15 each object relative compares cumulative number and accumulative threshold value to judge the mode of operation of each object respectively; Wherein, as previously mentioned described cumulative number be object relevant can in operation sensor, operational depth exceedes the number of depth threshold.Such as, when the cumulative number that object is relevant exceedes accumulative threshold value, judge that described object opposing optical touch-control system is touching state; And when the cumulative number that described object is relevant does not exceed described accumulative threshold value, judge that described object opposing optical touch-control system is described suspended state, as shown in Figure 7.
Step S
26: described judging unit 15 can calculate the shadow spacing of covering between shadow of multiple objects of each imageing sensor relatively, selects the depth threshold of or a group higher, TH0, TH1 of such as Figure 11 when described shadow spacing does not exceed spacing threshold
high, TH2
high; And select the depth threshold of or a group lower when described shadow spacing exceedes spacing threshold, TH0, TH1, TH2 of such as Figure 11.In addition, described judging unit 15 can calculate the merging shadow number covering shadow of multiple objects of relatively each imageing sensor and adjust at least one depth threshold described further according to described merging shadow number, such as, by depth threshold and then add the compensation 1 of Figure 11, N × compensations 1 or compensation 2.In addition, described judging unit 15 also the number of operation sensor can select suitable one or one group of depth threshold according to relative each object.
Because optical touch control system 1 of the present invention judges suspended state and the picture frame Corrected Depth threshold value that can obtain according to reality and accumulative threshold value according to synthesis result, therefore can have and preferably judge degree of accuracy.
Should be noted that, each depth threshold in Figure 11 can according to different application only section store in described storage element 16.
In sum, known optical formula contact panel still have be difficult to distinguish contact condition with the problem with suspended state.Therefore, the present invention also provides a kind of optical touch control system (Fig. 1,2) and its suspension determination methods (Figure 12) that judge short distance hoverheight, its image that can be obtained by multiple imageing sensor according to the depth threshold set in advance determines mode of operation jointly, and depth threshold and accumulative threshold value can be finely tuned according to operating conditions, to increase judgement degree of accuracy.
Although the present invention is open by previous embodiment, it is also not used to limit the present invention, and any technician in the technical field of the invention with common practise, without departing from the spirit and scope of the present invention, when doing various changes and amendment.Therefore protection scope of the present invention is as the criterion with appended right limited range.
Claims (21)
1. an optical touch control system, this optical touch control system comprises:
Touch surface, this touch surface is in order to supply at least one object at the enterprising line operate of this touch surface;
Multiple imageing sensor, imageing sensor described in each is in order to obtain the picture frame across described touch surface;
Storage element, what this storage element stored at least one depth threshold described touch surface relative to imageing sensor described in each can opereating specification;
Computing unit, this computing unit is in order to the operational depth of the coordinate that calculates object described in each according to described picture frame each described in imageing sensor relative to object described in each; And
Judging unit, this judging unit in order to the coordinate of object described in each is positioned at each can the opereating specification imageing sensor of being correlated be defined as can relatively relevant can being cumulative number, being judged as contact condition when described cumulative number exceedes accumulative threshold value by the operational depth of the operation sensor number that exceedes depth threshold of operation sensor, accumulative object described in each.
2. optical touch control system according to claim 1, wherein said accumulative threshold value and relevant to object described in each number of operation sensor can become positive correlation.
3. optical touch control system according to claim 1, wherein said judging unit also calculates the shadow spacing of covering between shadow of multiple objects of imageing sensor described in each relatively, and described storage element stores the depth threshold of relatively different shadow spacing.
4. optical touch control system according to claim 1, wherein said judging unit also calculates the merging shadow number covering shadow of multiple objects of imageing sensor described in each relatively, and adjusts described depth threshold according to described merging shadow number.
5. optical touch control system according to claim 1, wherein said depth threshold and relevant to object described in each number of operation sensor can become positive correlation.
6. optical touch control system according to claim 1, wherein said storage element stores multiple depth threshold, described depth threshold according to described can in opereating specification from the distance of relevant imageing sensor and different.
7. optical touch control system according to claim 1, wherein when the coordinate of one of them person of multiple objects of the merging shadow of relatively same imageing sensor be positioned at described imageing sensor can outside opereating specification time, the relatively described object of described imageing sensor is not defined as can operation sensor.
8. optical touch control system according to claim 1, wherein said operational depth is tried to achieve according to the one dimension gray-scale distribution of reference image frame and current picture frame.
9. optical touch control system according to claim 1, wherein said touch surface be increase described can opereating specification minute surface or be non-specular surface.
10. optical touch control system according to claim 1, this optical touch control system also comprises multiple reflecting strips and at least one system source in order to described reflecting strips of throwing light on of being arranged at the edge of described touch surface respectively, and the picture frame that wherein said imageing sensor obtains comprises at least one reflecting strips image.
11. optical touch control systems according to claim 1, wherein said can opereating specification by can detect minimum hoverheight determine.
The suspension determination methods of 12. 1 kinds of optical touch control systems, described optical touch control system comprises multiple respectively in order to obtain the imageing sensor across the picture frame of touch surface, and described suspension determination methods comprises:
Computing unit is utilized to calculate the operational depth of the coordinate of at least one object each described in imageing sensor relative at least one object according to described picture frame;
When described coordinate be positioned at the wherein one of described imageing sensor can opereating specification time, define described imageing sensor for can operation sensor;
What utilize judging unit to be correlated with to object described in each can the operational depth of operation sensor and at least one depth threshold compare; And
According to object described in each relatively relevant can judge the suspended state of object described in each by the operational depth of the operation sensor cumulative number that exceedes described depth threshold.
13. suspension determination methods according to claim 12, this suspension determination methods also comprises:
Calculate the shadow spacing of covering between shadow of multiple objects of imageing sensor described in each relatively; And
Described depth threshold is selected according to described shadow spacing.
14. suspension determination methods according to claim 12, this suspension determination methods also comprises:
Calculate the merging shadow number covering shadow of multiple objects of imageing sensor described in each relatively; And
Described depth threshold is adjusted according to described merging shadow number.
15. suspension determination methods according to claim 12, wherein said computing unit calculates described operational depth according to the one dimension gray-scale distribution of reference image frame and current picture frame.
16. suspension determination methods according to claim 12, this suspension determination methods also comprises:
When the described cumulative number relevant to object exceedes accumulative threshold value, judge that described object is touching state; And
When the described cumulative number relevant to object does not exceed described accumulative threshold value, judge that described object is described suspended state.
17. suspension determination methods according to claim 12, what wherein said accumulative threshold value was relevant to object described in each the number of operation sensor can become positive correlation.
18. suspension determination methods according to claim 12, this suspension determination methods also comprises:
Described depth threshold can be selected to the distance of relevant described imageing sensor in opereating specification according to described.
19. suspension determination methods according to claim 12, wherein when the described coordinate of one of them person of multiple objects of the merging shadow of relatively same imageing sensor to be positioned at described in described imageing sensor can outside opereating specification time, the relatively described object of described imageing sensor is not defined as can operation sensor.
20. 1 kinds of optical touch control systems, this optical touch control system comprises:
Touch surface, this touch surface with for object at the enterprising line operate of this touch surface;
Multiple imageing sensor, imageing sensor described in each is in order to obtain the picture frame across described touch surface;
Computing unit, this computing unit is in order to the operational depth of the coordinate that calculates described object according to described picture frame each described in imageing sensor relative to described object; And
Judging unit, this judging unit in order to be positioned at when described coordinate the wherein one of described imageing sensor can opereating specification and the described operational depth of relatively described imageing sensor exceed depth threshold time increase cumulative number, and judge the mode of operation of described object according to described cumulative number.
21. optical touch control systems according to claim 20, wherein said depth threshold described can be different according to the distance from relevant imageing sensor in opereating specification.
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