CN104123044B - A kind of touch identification method and system of infrared touch panel - Google Patents
A kind of touch identification method and system of infrared touch panel Download PDFInfo
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Abstract
The present invention provides a kind of touch identification method and system for infrared touch panel, the method finds the possible occlusion area of each touch point first in whole infrared touch panel, the scanning optical path to being blocked in possible occlusion area each described from the initial optical path image is processed so as to obtain touch point, the present invention need not be processed to each scanning optical path or pixel in infrared touch panel, substantially increase processing speed, effectively prevent in prior art based on the scanning to each light path or pixel, need each light path or pixel are processed to obtain touch point, so as to have impact on processing speed, the slow problem of processing speed.
Description
Technical field
The present invention relates to a kind of touch point recognition methodss of touch screen, more particularly, to a kind of touch for improving processing speed
Point recognition methodss and system, belong to touch screen control technology field.
Background technology
With the development of touching technique, touch screen is used widely as a kind of simply and easily human-computer interaction device.
At present, the species of touch screen mainly includes resistive touch screen, capacitive touch screen, surface acoustic wave touch screen, optical touch screen
With infrared touch panel etc..Wherein infrared touch panel is detecting and position user using the infrared ray matrix gathered in X, Y-direction
Touch operation, infrared touch panel surrounding install a circuit board housing, on circuit board housing arrange infrared transmitting tube and
Infrared receiving tube, corresponds and forms the infrared ray matrix for intersecting in length and breadth anyhow.User in Touch screen, the touch objects such as finger
Two infrared ray anyhow through the position are blocked, position of the touch point on screen is judged with this.Due to infrared touch panel
The advantages of with electric current, voltage and static interference, suitable rugged environment condition is not received, therefore the range of application of infrared touch panel
It is wider.
On infrared touch panel the recognition methodss of touch point experienced from identification a little to 2 points of identification, again to identification multiple spot
Evolution, as multiple point touching not only can realize more touch functions, and can be with two handss, multiple fingers, even
Many personal contents for operating screen simultaneously, convenient nature, so multiple spot technology of identification is the development trend of infrared touch panel.
Chinese patent document CN102419662A discloses a kind of multi-point recognizing method of infrared touch panel, firstly generate with
The corresponding index path picture of infrared touch panel light path in an identification process；Then in index path picture extract touch point information,
Wherein, generate index path as the step of in, judge whether every light path is hidden according to the light circuit-switched data of whole infrared touch panel
Gear, for the light path do not blocked, generates a line segment corresponding with the light path in the relevant position of initial optical path image.
In the patent documentation based on image procossing, light path global information is used, with preferable robustness and anti-
Making an uproar property, but generate index path as the step of in, need whether every light path for judging infrared touch panel is blocked, also,
Light path to not blocking generates a line segment corresponding with the light path in the relevant position of initial optical path image.Touch in large scale
In screen, due to the light path enormous amount in infrared touch panel, also, in infrared touch panel, there is the light path do not blocked in a large number,
Generation index path picture in this way is adopted in large scale touch screen, the data volume of process is very big, so as to have impact on processing speed.
Chinese patent document CN102419663A discloses a kind of multi-point recognizing method of infrared touch panel, gathers light first
Circuit-switched data；Secondly, generate the image/data structure with the infrared touch screen dimensions into preset ratio；Again, set up pixel/
The attribute that data element is associated with the light path on infrared touch panel；Then, according on pixel/data element and infrared touch panel
The associated attribute of light path and the smooth circuit-switched data extract touch point information.Wherein, by record through each pixel/
The quantity of the light path of data element and position are setting up the category that pixel/data element is associated with the light path on infrared touch panel
Property.
A kind of infrared touch screen multi-point recognition method based on Density Clustering is proposed in the patent documentation, by setting up figure
Associating between the data element of the pixel/data structure of picture and the light path on infrared touch panel, by light circuit-switched data, change with
The quantity of the associated light path of the data element of the pixel/data structure of image, when the pixel/data structure with some image
Data element associated light path quantity vanishing when, the data element of the pixel/data structure of the image is labeled as into mesh
Punctuate, further according to the density of the impact point of labelling, sets density threshold, impact point is clustered, and gathers the impact point for a class and is
The impact point for not having to cluster is set to background by one touch point, this to sentence from the order of magnitude of image pixel or array element
The method of disconnected impact point, although be capable of identify that multiple touch points.But, the prior art is setting up the pixel of image/data knot
In the step of attribute that the data element of structure is associated with light path, by recording each the pixel/data element through touch screen
The quantity of the light path of element and position need to process each pixel/data element of touch screen realizing, touch in large scale
Touch in screen, as the number data elements of the pixel/data structure of image in infrared touch panel are huge, adopt and process in this way
Pixel quantity it is too big, processing speed can be largely effected on.
Multi-touch recognition method disclosed in above-mentioned two patent documentations is scanned to every light path or each pixel
Obtain the information blocked of touch screen.With the increase of touch screen, the light path and pixel quantity on touch screen progressively increases, directly
Cause during identification, to need quantity of information increase to be processed, process time extends, so as to have impact on response speed.
The content of the invention
The technical problem to be solved is the touch identification method process time of prior art mid-infrared touch screen
The long and slow problem of response speed, so as to providing a kind of touch identification method of infrared touch panel for improving recognition speed and being
System.
To solve above-mentioned technical problem, the present invention is achieved by the following technical solutions：
A kind of touch identification method of infrared touch panel, comprises the following steps,
S1：All scanning optical paths in the case of collection no touch, form initial optical path image；
S2：Scan data when collection is touched；
S3：According to the scan data during touch for collecting, deflection axis light path or off-axis light path obtain each
The horizontal boundary information and longitudinal boundary information of touch point；The horizontal boundary information is the upper end border of each touch point with
End edge circle, the longitudinal boundary information are the left boundary and right boundary of each touch point；The upper end border and right with which
The lower end border answered forms horizontal occlusion area, and the left boundary and the corresponding right boundary form longitudinal direction
Occlusion area；
S4：According to the horizontal occlusion area and longitudinal occlusion area, possible occlusion area is obtained；
S5：For each the described possible occlusion area for obtaining, to can described in each from the initial optical path image
The scanning optical path being blocked in the occlusion area of energy is processed, and other described scanning optical paths are not processed, and obtaining a width has
Scanning optical path image in the case of touch objects presence；
S6：To it is described with the presence of touch objects in the case of the scanning optical path image carry out denoising, it is smooth, extract operation,
Obtain the positional information and size information of touch point.
A kind of touch identification method of infrared touch panel, step S5 further include following steps：
S511, for each the described possible occlusion area for obtaining, travel through each pixel, statistics is through each described picture
The light travel permit number of element, includes blocking light path through the light path of each pixel and does not block light path；
S512, for per light path is blocked described in bar, the described smooth travel permit number for blocking the pixel that light path passes through being subtracted
1；
S513, acquisition pass through the remaining scanning optical path bar number Ai of each pixel, and all pixels of Ai=0 are described
The region not being blocked in possible occlusion area, all pixels of Ai ≠ 0 are the touch point in the possible occlusion area
Region.
The touch identification method of described infrared touch panel, step S5 further include following steps：
S521, for each the described possible occlusion area for obtaining, travel through each pixel, statistics is through each pixel
Light travel permit number, include blocking light path through the light path described in each described pixel and do not block light path；
S522, for pixel each described, deduct through blocking light described in the pixel from the light travel permit number of the pixel
The bar number on road；
S523, for pixel each described, if the remaining scanning optical path bar number of the pixel is 0, the pixel is described
The pixel in the interior region that is not blocked of possible occlusion area, if the remaining scanning optical path bar number of the pixel is not 0, the pixel is
The pixel of occlusion area in the possible occlusion area.
The touch identification method of described infrared touch panel, determines the scanning optical path in institute using line light gated algorithm
Which state in possible occlusion area by pixel.
The touch identification method of described infrared touch panel, also includes the polymerization possible blocked area in step S4
The step of domain, concrete grammar is：
One blocks light path while during by least described two longitudinal occlusion areas, for longitudinal blocked area each described
Domain, compares longitudinal occlusion area and blocks the distance of other longitudinal occlusion areas that light path passes through with same, if institute
The distance of longitudinal occlusion area is stated less than default longitudinal direction threshold value, is then polymerized to same longitudinal occlusion area；
One blocks light path while during by least described two horizontal occlusion areas, for horizontal blocked area each described
Domain, compares the horizontal occlusion area and blocks the distance of other horizontal occlusion areas that light path passes through with same, if institute
The distance of horizontal occlusion area is stated less than horizontal threshold value is preset, is then polymerized to the same horizontal occlusion area.
The touch identification method of described infrared touch panel, in step S4, further includes to be polymerized for each
Region, if all vertical and horizontal through the zone of convergency block line while also passing through other at least one polymeric areas
Domain, the step of the zone of convergency is removed.
A kind of touch recognition system of infrared touch panel, including
Initial optical path image forming module, gathers all scanning optical paths in the case of no touch, forms initial optical path image；
Scanning optical path acquisition module, scan data when collection is touched；
Border acquisition module, according to the scan data during touch for collecting, deflection axis light path or off-axis light
Road obtains the horizontal boundary information and longitudinal boundary information of each touch point；The horizontal boundary information is the upper of each touch point
End edge circle and lower end border, the longitudinal boundary information are the left boundary and right boundary of each touch point；The upper end edge
Boundary and the corresponding lower end border form horizontal occlusion area, the left boundary and the corresponding right-hand member side
Boundary forms longitudinal occlusion area；
Possible occlusion area acquisition module, according to the horizontal occlusion area and longitudinal occlusion area, acquisition can
The occlusion area of energy；
Light path image collection module is touched, for each the described possible occlusion area for obtaining, from the initial optical path
The scanning optical path in image to being blocked in possible occlusion area each described is processed, other described scanning optical paths
Do not process, a width is obtained with the presence of the scanning optical path image in the case of touch objects；
Touch point acquisition module, to it is described with the presence of touch objects in the case of the scanning optical path image carry out denoising, flat
Sliding, extraction operation, obtains the positional information and size information of touch point.
A kind of touch recognition system of infrared touch panel, the possible occlusion area acquisition module are further wrapped
Include：
The light path statistic submodule of the first single pixel, for each the described possible occlusion area for obtaining, traversal is every
Individual pixel, statistics include blocking light path through the light path of each pixel through the light travel permit number of each pixel
Light path is not blocked；
Submodule of the light path by pixel is blocked in first process, for per light path is blocked described in bar, this being blocked light path and being led to
The described smooth travel permit number of the pixel crossed subtracts 1；
First submodule for obtaining possible occlusion area, obtains the remaining scanning optical path bar through each pixel
Number Ai, all pixels of Ai=0 are the region not being blocked in the possible occlusion area, and all pixels of Ai ≠ 0 are described
Touch point region in possible occlusion area.
The touch recognition system of described infrared touch panel, the touch light path image collection module further include as follows
Step：
The light path statistic submodule of the second single pixel, for each the described possible occlusion area for obtaining, traversal is every
One pixel, statistics include blocking light path through the light path described in each described pixel through the light travel permit number of each pixel
Light path is not blocked；
Second processing blocks submodule of the light path by pixel, for pixel each described, from the light travel permit number of the pixel
In deduct bar number through light path is blocked described in the pixel；
Second submodule for obtaining possible occlusion area, for pixel each described, if the remaining scanning of the pixel
Light travel permit number is 0, then the pixel is the pixel in the interior region that is not blocked of the possible occlusion area, if the pixel is remaining
Scanning optical path bar number is not 0, and the pixel is the pixel of occlusion area in the possible occlusion area.
The touch recognition system of described infrared touch panel, determines the scanning optical path in institute using line light gated algorithm
Which state in possible occlusion area by pixel.
The touch recognition system of described infrared touch panel, the possible occlusion area acquisition module are still further comprised
Possible occlusion area aggregation module, possible occlusion area aggregation module include：
Longitudinal occlusion area polymerization submodule, one blocks light path while by least described two longitudinal occlusion areas
When, for longitudinal occlusion area each described, compare longitudinal occlusion area and same block light path passes through other described in
The distance of longitudinal occlusion area, if the distance of longitudinal occlusion area is polymerized to same less than default longitudinal direction threshold value
One longitudinal occlusion area；
Horizontal occlusion area polymerization submodule, one blocks light path while by least described two horizontal occlusion areas
When, for horizontal occlusion area each described, compare the horizontal occlusion area and same block light path passes through other described in
Laterally the distance of occlusion area, if the distance of the horizontal occlusion area is less than horizontal threshold value is preset, is polymerized to same
One horizontal occlusion area.
The touch recognition system of described infrared touch panel, the possible occlusion area acquisition module, further includes
The pseudo- zone of convergency removes submodule, for each zone of convergency, if all vertical and horizontal through the zone of convergency hide
Gear line also passes through other at least one zones of convergency simultaneously, and the zone of convergency is removed.
The above-mentioned technical proposal of the present invention has advantages below compared to existing technology：
（1）The present invention provides a kind of touch identification method and system for infrared touch panel, and the method includes following step
Suddenly:All scanning optical paths in the case of collection no touch, form initial optical path image；According to the scan data for collecting, obtain
The horizontal boundary information and longitudinal boundary information of each touch point；Obtain the horizontal boundary information and longitudinal boundary of each touch point
Information, obtains the possible position area information of each touch point；For possible position region each described, from the initial optical path
The scanning optical path in image to being blocked in possible occlusion area each described is processed, and obtaining a width has touch objects
In the presence of scanning optical path image；Denoising, flat is carried out to the scanning optical path image having in the presence of touch objects
The operation of sliding, touch objects contours extract, obtains the positional information and size information of touch point.Said method is first whole infrared tactile
The possible occlusion area of each touch point is found in touching screen, is blocked to possible each described from the initial optical path image
The scanning optical path being blocked in region is processed so as to obtain touch point, and this method greatly reduces the light path of process
Bar number, it is not necessary to whole initial optical path image is processed, processing speed is improve, is based in effectively prevent prior art
Scanning to each light path or pixel, needs each light path or pixel are processed to obtain touch point, so as to have impact on place
Reason speed, the slow problem of processing speed.
（2）A kind of touch identification method for infrared touch panel of the present invention, for the possible position in touch point
Region, only processes the light travel permit number for blocking light path, greatly reducing process through the region, improves and further increase identification
Speed.
（3）A kind of touch identification method for infrared touch panel of the present invention, can be polymerized possible blocked area
At least two occlusion areas are polymerized to same region by domain, obtain the zone of convergency, when touch point is more, are polymerized possible
After occlusion area, for the zone of convergency, from the initial optical path image to the zone of convergency each described in be blocked described in
Scanning optical path is processed, and is greatly reduced the areal of process, is further increased recognition speed.
（4）A kind of touch identification method for infrared touch panel of the present invention, if through a zone of convergency
Block line while also passing through at least one other zone of convergency, the zone of convergency is removed, further reduces what is processed
Number of regions, improves recognition speed.
Description of the drawings
In order that present disclosure is more likely to be clearly understood, below in conjunction with the accompanying drawings, the present invention is made further in detail
Thin explanation, wherein,
Fig. 1 is a kind of recognition methodss flow chart for infrared touch panel of the present invention；
Fig. 2 be it is of the present invention horizontally and vertically will carry out phase crosslinking polymerization in direction, obtain four zone of convergency schematic diagrams；
If Fig. 3 is of the present invention to block line also while poly- through other at least one through a zone of convergency
Close region, then illustrate in the zone of convergency, there is no touch point, the schematic diagram after the zone of convergency is removed；
Fig. 4 is that a region in the lower right corner in Fig. 1 of the present invention is removed the design sketch after blocking line.
Specific embodiment
Embodiment 1：
A kind of recognition methodss for infrared touch panel of the present embodiment, its flow chart is as shown in figure 1, be embodied as including
Following step：
S1：All scanning optical paths in the case of collection no touch, form initial optical path image.Comprise the following steps that：
S11：A width and touch screen size are generated into the background image of preset ratio, the color of the background image is single
Color.As shown in Fig. 2 the color of the background image is set to black.
The size of the touch screen can be arbitrary proportion with the size of the background image, by user according to concrete application
Environment set, in the present embodiment, the preset ratio is 1:1, coordinate of such light path on the touch screen and light path are in the back of the body
Respective coordinates in scape image are without the need for conversion.
Used as other embodiment, the color of the background image could be arranged to other colors, for example, Lycoperdon polymorphum Vitt.
S12：All scanning optical paths in the case of collection no touch, and all of scanning optical path is plotted in into the Background
As upper, initial optical path image is formed, the color of the scanning optical path is different from the color of the background image.In this enforcement, such as
Shown in Fig. 2, the color of the scanning optical path is set to white.
As other embodiment, when the initial optical path image is generated, and non-real generation index path picture, but use
Primary data structure with two-dimensional matrix alignment properties is simulating initial optical path image, the element in the primary data structure
Equivalent to the pixel in the initial optical path image, all elements value in the primary data structure is initialized as into first and is set
Fixed number value.The data structure of the two-dimensional matrix alignment properties can be two-dimensional array, bivector or two-dimensional matrix etc..
Used as other embodiment, the color of the scanning optical path could be arranged to other different from background image color
Color, for example it is, dark brown.
S2：Scan data when collection is touched.
S3：According to the scan data during touch for collecting, deflection axis light path or off-axis light path obtain each
The horizontal boundary information and longitudinal boundary information of touch point；The horizontal boundary information is the upper end border of each touch point with
End edge circle, the longitudinal boundary information are the left boundary and right boundary of each touch point；The upper end border and right with which
The lower end border answered forms horizontal occlusion area, and the left boundary and the corresponding right boundary form longitudinal direction
Occlusion area.
S4：According to the horizontal occlusion area and longitudinal occlusion area, possible occlusion area is obtained.
According to the scan data for collecting, the circumstance of occlusion of light path is obtained, using deflection axis light path or off-axis light path
The horizontal boundary information and longitudinal boundary information of each touch point are obtained, such as horizontal direction obtains m horizontal boundary information, vertically
Direction obtains n longitudinal boundary information, then obtain common m*n possible position region.It is shown in Figure 2, merely illustrate in figure true
Real touch point, such as horizontal direction obtain 10 horizontal boundary information, and vertical direction obtains 10 longitudinal boundary information, then can be with
Obtain 100 possible bands of position.
S5：For each the described possible occlusion area for obtaining, to can described in each from the initial optical path image
The scanning optical path being blocked in the occlusion area of energy is processed, and other described scanning optical paths are not processed, and obtaining a width has
Scanning optical path image in the case of touch objects presence.
The concrete width that obtains is with the presence of as follows the step of scanning optical path image in the case of touch objects：
S511, for each the described possible occlusion area for obtaining, travel through each pixel, statistics is through each described picture
The light travel permit number of element, includes blocking light path through the light path of each pixel and does not block light path；Adopt in the present embodiment
With line light gated algorithm（Such as Bresenham algorithms）Determine that the scanning optical path passes through in the possible occlusion area
Which pixel；
S512, for per light path is blocked described in bar, the described smooth travel permit number for blocking the pixel that light path passes through being subtracted
1；
S513, acquisition pass through the remaining scanning optical path bar number A of each pixeli, Ai=0 all pixels for it is described can
The region not being blocked in the occlusion area of energy, Ai≠ 0 all pixels are the touch point area in the possible occlusion area
Domain.
Preferably, by AiThe color settings of=0 pixel are the colors different from the initial optical path image, the present embodiment
In, by AiThe color settings of=0 pixel are black.As shown in figure 4, being that a region to the lower right corner in Fig. 2 is removed screening
Design sketch after gear line process.
In the scanning optical path image, it is the first setting numerical value in the primary data structure not block light path, is blocked
Light path is changed to the second setting numerical value in the primary data structure.
S6：To it is described with the presence of touch objects in the case of the scanning optical path image carry out denoising, it is smooth, extract operation,
Obtain the positional information and size information of touch point.
The present invention provides a kind of touch identification method for infrared touch panel, and the method comprises the steps:Generate one
The background image of width and touch screen size into preset ratio；All scanning optical paths in the case of collection no touch, form initial light
Road image；According to the scan data for collecting, the horizontal boundary information and longitudinal boundary information of each touch point are obtained；Obtain every
The horizontal boundary information and longitudinal boundary information of individual touch point, obtains the possible position area information of each touch point；For every
The individual possible position region, to described in being blocked in possible occlusion area each described from the initial optical path image
Scanning optical path is processed, and obtaining a width has scanning optical path image in the presence of touch objects；To described with the presence of touch objects
In the case of scanning optical path image carry out denoising, the operation of smooth, touch objects contours extract, obtain touch point positional information and
Size information.Said method finds the possible occlusion area of each touch point first in whole infrared touch panel, from described
The scanning optical path in initial optical path image to being blocked in possible occlusion area each described is processed so as to obtain
Touch point, this method greatly reduce the light travel permit number of process, it is not necessary to which whole initial optical path image is processed, and improve
Processing speed, effectively prevent in prior art based on the scanning to each light path or pixel, needs to each light path or picture
Element is processed to obtain touch point, so as to have impact on processing speed, the slow problem of processing speed.
A kind of touch identification method for infrared touch panel of the present invention, for the possible position area in touch point
Domain, only processes the light travel permit number for blocking light path, greatly reducing process through the region, improves and further increases identification speed
Degree.
Embodiment 2：
In the present embodiment, from unlike above-described embodiment 1, step S6 described in the present embodiment is for each institute for obtaining
Possible occlusion area is stated, to sweeping described in being blocked in possible occlusion area each described from the initial optical path image
Retouch light path to be processed, other described scanning optical paths are not processed, specifically, a width is obtained with the presence of the scanning in the case of touch objects
Index path as the step of it is as follows：
S521, for each the described possible occlusion area for obtaining, travel through each pixel, statistics is through each pixel
Light travel permit number, include blocking light path through the light path described in each described pixel and do not block light path；Adopt in the present embodiment
Determine the scanning optical path in the possible occlusion area by which pixel with line light gated algorithm.
S522, for pixel each described, deduct through blocking light described in the pixel from the light travel permit number of the pixel
The bar number on road；
S523, for pixel each described, if the remaining scanning optical path bar number of the pixel is 0, the pixel is described
The pixel in the interior region that is not blocked of possible occlusion area, if the remaining scanning optical path bar number of the pixel is not 0, the pixel is
The pixel of occlusion area in the possible occlusion area.Preferably, by the color of pixel that remaining scanning optical path bar number is 0
It is arranged to the colors different from the initial optical path image.
Embodiment 3：
The present embodiment, on the basis of above-described embodiment, also includes the polymerization possible blocked area in step S4
The step of domain, concrete grammar is：
One blocks light path while during by least described two longitudinal occlusion areas, for longitudinal blocked area each described
Domain, compares longitudinal occlusion area and blocks the distance of other longitudinal occlusion areas that light path passes through with same, if institute
The distance of longitudinal occlusion area is stated less than default longitudinal direction threshold value, is then polymerized to same longitudinal occlusion area；
One blocks light path while during by least described two horizontal occlusion areas, for horizontal blocked area each described
Domain, compares the horizontal occlusion area and blocks the distance of other horizontal occlusion areas that light path passes through with same, if institute
The distance of horizontal occlusion area is stated less than horizontal threshold value is preset, is then polymerized to the same horizontal occlusion area.
Referring to Fig. 2, in above-described embodiment 1,2 steps, S4 needs to process this 100 regions respectively, for more
The situation of touch point, the possible position region of acquisition are more, and for same is blocked light path while through multiple possible positions
In the case of putting region, need repetition to process this and block light path, therefore computing is more complicated, for further simplified operation, carries
At high speed, by setting horizontal threshold value and longitudinal threshold value, for the lateral separation and fore-and-aft distance of occlusion area, if blocked area
The lateral separation in domain be less than horizontal threshold value and, the fore-and-aft distance of occlusion area less than longitudinal threshold value, then by the two occlusion areas
One region of synthesis, it is believed that be a zone of convergency, otherwise, belong to two regions.So through the phase in horizontally and vertically direction
Crosslinking polymerization can obtain little zone of convergency, for example, if horizontally and vertically direction ECDC and after each remaining two merge after
Occlusion area, then horizontally and vertically will carry out phase crosslinking polymerization in direction, four zones of convergency, all touch point positions will be obtained
In this four regions, step S5 and later operation are carried out to these four zones of convergency again then.
A kind of touch identification method for infrared touch panel of the present invention, can be polymerized possible occlusion area,
At least two occlusion areas are polymerized to into same region, the zone of convergency is obtained, when touch point is more, be polymerized possible blocking
Behind region, for the zone of convergency, from the initial optical path image to the zone of convergency each described in the scanning that is blocked
Light path is processed, and is greatly reduced the areal of process, is further increased recognition speed.
Embodiment 4：
The present embodiment in step S4, is further included for each polymeric area on the basis of above-described embodiment
Domain, if all vertical and horizontal through the zone of convergency block line while also passing through other at least one zones of convergency,
The step of zone of convergency is removed.
On the basis of the zone of convergency of above-described embodiment 3, if blocking line while also passing through through a zone of convergency
At least one other zone of convergency, the zone of convergency is removed.In order to further improve processing speed, for each polymerization
Region, if exist in line only through the zone of convergency, and without other zones of convergency through blocking for a zone of convergency,
So this carries out the later operation of step S6 in embodiment 1 to the zone of convergency；If blocking line through a zone of convergency
Also simultaneously through at least one other zone of convergency, then illustrate there is no touch point in the zone of convergency, by the polymeric area
Domain removes, as shown in Figure 3, it is only necessary to two regions that there is true touch point that figure center wire frame goes out are processed, so
When processing to the zone of convergency, the speed that improve identification is greatly improved.
A kind of touch identification method for infrared touch panel of the present invention, if through the screening of a zone of convergency
Gear line also passes through at least one other zone of convergency simultaneously, and the zone of convergency is removed, the region of process is further reduced
Number, improves recognition speed.
Embodiment 5：
A kind of touch recognition system of infrared touch panel, including
Initial optical path image forming module, gathers all scanning optical paths in the case of no touch, forms initial optical path image；
Scanning optical path acquisition module, scan data when collection is touched；
Border acquisition module, according to the scan data during touch for collecting, deflection axis light path or off-axis light
Road obtains the horizontal boundary information and longitudinal boundary information of each touch point；The horizontal boundary information is the upper of each touch point
End edge circle and lower end border, the longitudinal boundary information are the left boundary and right boundary of each touch point；The upper end edge
Boundary and the corresponding lower end border form horizontal occlusion area, the left boundary and the corresponding right-hand member side
Boundary forms longitudinal occlusion area；
Possible occlusion area acquisition module, according to the horizontal occlusion area and longitudinal occlusion area, acquisition can
The occlusion area of energy；
Light path image collection module is touched, for each the described possible occlusion area for obtaining, from the initial optical path
The scanning optical path in image to being blocked in possible occlusion area each described is processed, other described scanning optical paths
Do not process, a width is obtained with the presence of the scanning optical path image in the case of touch objects；
Touch point acquisition module, to it is described with the presence of touch objects in the case of the scanning optical path image carry out denoising, flat
Sliding, extraction operation, obtains the positional information and size information of touch point.
A kind of touch recognition system of infrared touch panel, the possible occlusion area acquisition module are further wrapped
Include：
The light path statistic submodule of the first single pixel, for each the described possible occlusion area for obtaining, traversal is every
Individual pixel, statistics include blocking light path through the light path of each pixel through the light travel permit number of each pixel
Light path is not blocked；
Submodule of the light path by pixel is blocked in first process, for per light path is blocked described in bar, this being blocked light path and being led to
The described smooth travel permit number of the pixel crossed subtracts 1；
First submodule for obtaining possible occlusion area, obtains the remaining scanning optical path bar through each pixel
Number Ai, all pixels of Ai=0 are the region not being blocked in the possible occlusion area, and all pixels of Ai ≠ 0 are described
Touch point region in possible occlusion area.
The touch recognition system of described infrared touch panel, the touch light path image collection module further include as follows
Step：
The light path statistic submodule of the second single pixel, for each the described possible occlusion area for obtaining, traversal is every
One pixel, statistics include blocking light path through the light path described in each described pixel through the light travel permit number of each pixel
Light path is not blocked；
Second processing blocks submodule of the light path by pixel, for pixel each described, from the light travel permit number of the pixel
In deduct bar number through light path is blocked described in the pixel；
Second submodule for obtaining possible occlusion area, for pixel each described, if the remaining scanning of the pixel
Light travel permit number is 0, then the pixel is the pixel in the interior region that is not blocked of the possible occlusion area, if the pixel is remaining
Scanning optical path bar number is not 0, and the pixel is the pixel of occlusion area in the possible occlusion area.
The touch recognition system of described infrared touch panel, determines the scanning optical path in institute using line light gated algorithm
Which state in possible occlusion area by pixel.
The touch recognition system of described infrared touch panel, the possible occlusion area acquisition module are still further comprised
Possible occlusion area aggregation module, possible occlusion area aggregation module include：
Longitudinal occlusion area polymerization submodule, one blocks light path while by least described two longitudinal occlusion areas
When, for longitudinal occlusion area each described, compare longitudinal occlusion area and same block light path passes through other described in
The distance of longitudinal occlusion area, if the distance of longitudinal occlusion area is polymerized to same less than default longitudinal direction threshold value
One longitudinal occlusion area；
Horizontal occlusion area polymerization submodule, one blocks light path while by least described two horizontal occlusion areas
When, for horizontal occlusion area each described, compare the horizontal occlusion area and same block light path passes through other described in
Laterally the distance of occlusion area, if the distance of the horizontal occlusion area is less than horizontal threshold value is preset, is polymerized to same
One horizontal occlusion area.
The touch recognition system of described infrared touch panel, the possible occlusion area acquisition module, further includes
The pseudo- zone of convergency removes submodule, for each zone of convergency, if all vertical and horizontal through the zone of convergency hide
Gear line also passes through other at least one zones of convergency simultaneously, and the zone of convergency is removed.
Obviously, above-described embodiment is only intended to clearly illustrate example, and the not restriction to embodiment.It is right
For those of ordinary skill in the art, can also make on the basis of the above description other multi-forms change or
Change.There is no need to be exhaustive to all of embodiment.And thus it is extended obvious change or
Among changing still in the protection domain of the invention.
Claims (8)
1. a kind of touch identification method of infrared touch panel, it is characterised in that：Comprise the following steps,
S1：All scanning optical paths in the case of collection no touch, form initial optical path image；
S2：Scan data when collection is touched；
S3：According to the scan data during touch for collecting, deflection axis light path or off-axis light path obtain each touch
The horizontal boundary information and longitudinal boundary information of point；The horizontal boundary information is the upper end border of each touch point and lower end edge
Boundary, the longitudinal boundary information are the left boundary and right boundary of each touch point；The upper end border and corresponding
The lower end border forms horizontal occlusion area, and the left boundary and the corresponding right boundary form longitudinal direction and block
Region；
S4：According to the horizontal occlusion area and longitudinal occlusion area, possible occlusion area is obtained；
S5：For each the described possible occlusion area for obtaining, to possible each described from the initial optical path image
The scanning optical path being blocked in occlusion area is processed, and other described scanning optical paths are not processed, and obtaining a width has touch
Scanning optical path image in the case of thing presence；
S6：To it is described with the presence of touch objects in the case of the scanning optical path image carry out denoising, it is smooth, extract operation, obtain
The positional information and size information of touch point.
2. a kind of touch identification method of infrared touch panel according to claim 1, it is characterised in that：Enter in step S5
One step comprises the steps：
S511, for each the described possible occlusion area for obtaining, travel through each pixel, statistics is through each pixel
Light travel permit number, includes blocking light path through the light path of each pixel and does not block light path；
S512, for per light path is blocked described in bar, subtracting 1 by the described smooth travel permit number for blocking the pixel that light path passes through；
S513, acquisition pass through the remaining scanning optical path bar number A of each pixeli, Ai=0 all pixels are possible
Occlusion area in the region that is not blocked, Ai≠ 0 all pixels are the touch point region in the possible occlusion area.
3. the touch identification method of infrared touch panel according to claim 1, it is characterised in that：Enter one in step S5
Step comprises the steps：
S521, for each the described possible occlusion area for obtaining, travel through each pixel, light of the statistics through each pixel
Travel permit number, includes blocking light path through the light path described in each described pixel and does not block light path；
S522, for pixel each described, deduct through blocking light path described in the pixel from the light travel permit number of the pixel
Bar number；
S523, for pixel each described, if the remaining scanning optical path bar number of the pixel is 0, the pixel is possible
Occlusion area in be not blocked the pixel in region, if the remaining scanning optical path bar number of the pixel is not 0, the pixel is described
The pixel of occlusion area in possible occlusion area.
4. the touch identification method of the infrared touch panel according to Claims 2 or 3, it is characterised in that：Using linear grating
Changing algorithm determines the scanning optical path in the possible occlusion area by which pixel.
5. the touch recognition system of a kind of infrared touch panel, it is characterised in that：Including initial optical path image forming module, nothing is gathered
All scanning optical paths in the case of touch, form initial optical path image；
Scanning optical path acquisition module, scan data when collection is touched；
Border acquisition module, obtains according to the scan data during touch for collecting, deflection axis light path or off-axis light path
Take the horizontal boundary information and longitudinal boundary information of each touch point；
The horizontal boundary information is the upper end border and lower end border of each touch point, and the longitudinal boundary information is touched for each
Touch left boundary a little and right boundary；The upper end border and the corresponding lower end border form horizontal blocked area
Domain, the left boundary and the corresponding right boundary form longitudinal occlusion area；
Possible occlusion area acquisition module, according to the horizontal occlusion area and longitudinal occlusion area, obtains possible
Occlusion area；
Light path image collection module is touched, for each the described possible occlusion area for obtaining, from the initial optical path image
In the scanning optical path that is blocked in possible occlusion area each described is processed, other described scanning optical paths are not located
Reason, obtains a width with the presence of the scanning optical path image in the case of touch objects；
Touch point acquisition module, to it is described with the presence of touch objects in the case of the scanning optical path image carry out denoising, smooth, carry
Extract operation, obtains the positional information and size information of touch point.
6. the touch recognition system of a kind of infrared touch panel according to claim 5, it is characterised in that：It is described possible to block
Region acquisition module is further included：
The light path statistic submodule of the first single pixel, for each the described possible occlusion area for obtaining, travels through each picture
Element, light travel permit number of the statistics through each pixel include blocking light path and not through the light path of each pixel
Block light path；
Submodule of the light path by pixel is blocked in first process, for per light path is blocked described in bar, this being blocked what light path passed through
The described smooth travel permit number of the pixel subtracts 1；
First submodule for obtaining possible occlusion area, obtains the remaining scanning optical path bar number through each pixel
The all pixels of Ai, Ai=0 are the region not being blocked in the possible occlusion area, and all pixels of Ai ≠ 0 are described
Touch point region in possible occlusion area.
7. the touch recognition system of infrared touch panel according to claim 5, it is characterised in that：The touch index path picture
Acquisition module further includes following steps：
The light path statistic submodule of the second single pixel, for each the described possible occlusion area for obtaining, travels through each
Pixel, light travel permit number of the statistics through each pixel include blocking light path and not through the light path described in each described pixel
Block light path；
Second processing blocks submodule of the light path by pixel, for pixel each described, subtracts from the light travel permit number of the pixel
Go the bar number of light path is blocked described in the pixel；
Second submodule for obtaining possible occlusion area, for pixel each described, if the remaining scanning optical path of the pixel
Bar number is 0, then the pixel is the pixel in the interior region that is not blocked of the possible occlusion area, if the remaining scanning of the pixel
Light travel permit number is not 0, and the pixel is the pixel of occlusion area in the possible occlusion area.
8. the touch recognition system of the infrared touch panel according to claim 6 or 7, it is characterised in that：Using linear grating
Changing algorithm determines the scanning optical path in the possible occlusion area by which pixel.
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| CN101075168A (en) * | 2007-06-22 | 2007-11-21 | 北京汇冠新技术有限公司 | Method for discriminating multiple points on infrared touch screen |
| CN101320307A (en) * | 2007-06-04 | 2008-12-10 | 北京汇冠新技术有限公司 | Method for recognizing multiple touch points on infrared touch screen |
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| CN101320307A (en) * | 2007-06-04 | 2008-12-10 | 北京汇冠新技术有限公司 | Method for recognizing multiple touch points on infrared touch screen |
| CN101075168A (en) * | 2007-06-22 | 2007-11-21 | 北京汇冠新技术有限公司 | Method for discriminating multiple points on infrared touch screen |
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