WO2013016996A1 - 一种红外触摸屏多点识别方法及系统 - Google Patents
一种红外触摸屏多点识别方法及系统 Download PDFInfo
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- WO2013016996A1 WO2013016996A1 PCT/CN2012/077831 CN2012077831W WO2013016996A1 WO 2013016996 A1 WO2013016996 A1 WO 2013016996A1 CN 2012077831 W CN2012077831 W CN 2012077831W WO 2013016996 A1 WO2013016996 A1 WO 2013016996A1
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- optical path
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- target point
- touch screen
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
- G06F3/0421—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means by interrupting or reflecting a light beam, e.g. optical touch-screen
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04104—Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger
Definitions
- the invention relates to an infrared touch screen multi-point recognition method and system, in particular to an infrared multi-point recognition method and system based on density clustering.
- touch screens are widely used as a simple and convenient human-computer interaction device.
- the types of touch screens mainly include resistive touch screens, capacitive touch screens, surface acoustic wave touch screens, optical touch screens, and infrared touch screens.
- the infrared touch screen uses an infrared matrix densely arranged in the X and Y directions to detect and locate the user's touch operation.
- the infrared touch screen is provided with a circuit board outer frame on the front side of the display.
- the circuit board arranges the infrared transmitting tube and the infrared receiving tube on the four sides of the screen, and one-to-one correspondingly forms an infrared matrix which is horizontally and vertically crossed.
- the touch object such as a finger blocks the two infrared rays passing through the position, so that the position of the touch point on the screen can be judged. Since the infrared touch screen has the advantages of being free from current, voltage and static interference, and being suitable for harsh environmental conditions, the infrared touch screen has a wide application range.
- the identification method of touch points on the infrared touch screen has gone through the development process from identifying a point to recognizing two points and then identifying more points.
- Multi-point (more than two points) recognition will inevitably become the trend of infrared touch screens, because multi-touch can not only display more dazzling display effects, but also achieve more touch functions.
- the two-point identification method of the infrared touch screen is basically mature at present, and the key step in the recognition process is to remove ghost points, which are non-real touch points recognized on the infrared touch screen.
- logical judgment methods can be used. For example, according to the distance relationship between each corresponding quasi-touch point set in two (or more) logic screens, the real touch points are directly filtered. The theoretical basis is: The real point has a small deviation in the scan results of each logical screen, and the ghost point deviation is large. This method of removing ghost points is simple and easy to implement, and the calculation amount is small, and the ability to remove ghosts is strong.
- the technical problem to be solved by the present invention is to provide an infrared touch screen multi-point recognition method and system capable of improving accuracy.
- the technical solution adopted by the present invention is as follows:
- An infrared touch screen multi-point identification method includes the following steps:
- Touch point information is extracted based on attributes associated with the optical path and the optical path data.
- the pixel establishing the image is associated with the optical path
- the properties are specifically:
- the number of optical paths passing through each pixel and the position or serial number of the optical path passing through the pixel are recorded.
- the specific step of extracting the touch point information may be: searching for a target point according to an attribute associated with the optical path and the optical path; and setting a density threshold And traversing each target point in turn, clustering the target points according to the clustering condition, and obtaining at least one cluster set;
- the central coordinate of the target point in each cluster set and the area covered by the target point are calculated, and the central coordinate is taken as the coordinates of the touched point, and the area covered by the target point is taken as the area of the touched point.
- the specific step of extracting the touch point information may be: searching for a target point according to an attribute associated with the pixel and the optical path and the optical path data; setting a density Threshold, traversing each target point in turn, clustering the target points according to the clustering condition, and obtaining at least one cluster set;
- the center coordinates of the target points and the areas covered by the target points in the respective cluster sets that are not discarded are calculated, and the center coordinates are used as the coordinates of the touched points, and the area covered by the target points is taken as the area of the touched points.
- the infrared touch screen multi-point identification method as described above, the method for finding a target point may be:
- step 3 determines whether the current optical path is occluded, and if so, the number of optical paths associated with the current pixel is decreased by 1, and proceeds to step 4; otherwise, directly proceeds to step 4;
- step 4 determines whether it has traversed all the optical paths through the current pixel, and if so, proceeds to step 5; otherwise, proceeds to step 2;
- step 5 determines whether the number of optical paths associated with the current pixel becomes 0, and if so, marks the pixel as a target point, proceeds to step 6; otherwise, directly proceeds to step 6;
- the method for searching for a target point may also be:
- step 3 0, if yes, mark the pixel as a target point, go to step 3; otherwise, go directly to step 3;
- the infrared touch screen multi-point recognition method as described above, the method for clustering the target points is as follows:
- step 3 determining whether the target point density in the neighborhood of the current target point is greater than a set density threshold, and if so, using the target point as an element in a cluster set, proceeding to step 3; otherwise, discarding the target point, the gathering Class set After the completion, go to step 3;
- step 3 Determine whether the target point has been traversed, and if so, end; otherwise, go to step 1.
- the step of tracking the movement of the touch point is based on the distance between the position of the touch point at the previous moment and the position of the touch point at the current time.
- An infrared touch screen multi-point identification method includes the following steps:
- the data structure is a two-dimensional array
- the data element is an array element
- the attribute of establishing the data element associated with the optical path is specifically:
- the number of optical paths passing through each data element and the position or sequence number of the optical path passing through the data element are recorded.
- the infrared touch screen multi-point recognition method as described above, the specific step of extracting the touch point information may be: searching for a target point according to an attribute associated with the data element and the optical path and the optical path data; setting a density Threshold, traversing each target point in turn, clustering the target points according to the clustering condition, and obtaining at least one cluster set;
- the central coordinate of the target point in each cluster set and the area covered by the target point are calculated, and the central coordinate is taken as the coordinates of the touched point, and the area covered by the target point is taken as the area of the touched point.
- the specific step of extracting the touch point information may be: searching for a target point according to an attribute associated with the data element and the optical path and the optical path data; Density threshold, traversing each target point in turn, clustering the target points according to the clustering condition, and obtaining at least one cluster set;
- the center coordinates of the target points and the areas covered by the target points in the respective cluster sets that are not discarded are calculated, and the center coordinates are used as the coordinates of the touched points, and the area covered by the target points is taken as the area of the touched points.
- the infrared touch screen multi-point identification method as described above, the method for finding a target point may be:
- step 3 determines whether the current optical path is occluded, and if so, the number of optical paths associated with the current data element is reduced by 1, and proceeds to step 4; otherwise, directly proceeds to step 4;
- step 4 determines whether it has traversed all the optical paths through the current data element, and if so, proceeds to step 5; otherwise, proceeds to step 2;
- step 5 determining whether the number of optical paths associated with the current data element becomes 0, and if so, marking the data element Record as a target point, proceed to step 6; otherwise, go directly to step 6;
- step 6 Determine if all data elements have been processed, and if so, end; otherwise, go to step 1.
- the method for searching for a target point may also be:
- step 2 traversing again a data element passing through the occluded optical path, determining whether the number of optical paths passing through the data element becomes 0, and if so, marking the data element as a target point, proceeds to step 3; otherwise, directly proceeds to step 3 ;
- the infrared touch screen multi-point recognition method as described above, the method for clustering the target points is as follows:
- step 3 determining whether the target point density in the neighborhood of the current target point is greater than a set density threshold, and if so, using the target point as an element in a cluster set, proceeding to step 3; otherwise, discarding the target point, the gathering After the class is complete, go to step 3.
- step 3 Determine whether the target point has been traversed, and if so, end; otherwise, go to step 1.
- the step of tracking the movement of the touch point is based on the distance between the position of the touch point at the previous moment and the position of the touch point at the current time.
- a multi-point recognition system for an infrared touch screen comprising:
- a data acquisition device for collecting optical path data in one identification process
- An image generating device for generating an image in a preset ratio to the size of the infrared touch screen
- An attribute establishing means for establishing an attribute of a pixel of the image associated with an optical path on the infrared touch screen
- a touch point information extracting means for extracting touch point information based on an attribute of the pixel associated with the optical path and the optical path data.
- the attribute establishing means includes:
- An optical path determining unit for determining an optical path passing through each pixel according to the preset ratio and the direction of the optical path
- a position or serial number attribute recording unit for recording the number of optical paths passing through each pixel and the optical path passing through the pixel.
- the touch point information extraction device includes:
- a target point search unit for finding a target point based on an attribute associated with the pixel and the optical path and the optical path data
- clustering unit for clustering target points according to clustering conditions, wherein the clustering unit sets a density threshold, sequentially traverses each target point, and clusters the target points according to the clustering condition to obtain at least one cluster.
- the touch point calculation unit for calculating a coordinate of a touch point and an area of the touch point, the touch point calculation unit calculates a center coordinate of the target point in each cluster set and an area covered by the target point, and uses the center coordinate as a touch The coordinates of the point, the area covered by the target point as the area of the touch point.
- the touch point information extraction device includes: a target point search unit for finding a target point according to an attribute associated with the pixel and the optical path and the optical path data;
- a clustering unit for clustering target points according to clustering conditions
- An area determining unit for sequentially determining whether an area covered by each cluster set is larger than the area threshold, the area determining unit sets an area threshold, and sequentially determines whether an area covered by each cluster set is larger than the area
- the area judgment unit of the threshold if it is larger, the cluster set is used as a touch point; otherwise, the cluster set is discarded, and the next cluster set is determined until all cluster sets are determined;
- a touch point calculation unit for calculating a coordinate of the touch point and an area of the touch point
- the touch point calculation unit calculates a center coordinate of the target point in each cluster set that is not discarded, and an area covered by the target point, and the The center coordinate is used as the coordinates of the touched point, and the area covered by the target point is taken as the area of the touched point.
- the infrared touch screen multi-point recognition system as described above, the system further comprising motion tracking means for tracking the movement of the touch point based on a distance between the position of the touch point according to the previous time and the position of the touch point of the current time.
- Multi-point recognition system for infrared touch screen including
- a data acquisition device for collecting optical path data in one identification process
- a data structure generating apparatus for generating a data structure having a two-dimensional matrix arrangement property in a predetermined ratio to the size of the infrared touch screen
- An attribute establishing means for establishing an attribute of a data element of the data structure associated with an optical path on the infrared touch screen
- a touch point information extracting means for extracting touch point information based on an attribute of the data element associated with the optical path and the optical path data.
- the attribute establishing means includes:
- An optical path determining unit for determining an optical path passing through each of the data elements according to the preset ratio and the direction of the optical path;
- a position or sequence attribute recording unit for recording the number of optical paths passing through each data element and the optical path passing through the data element.
- the touch point information extraction device includes:
- a target point search unit for finding a target point based on an attribute associated with the data element and the optical path and the optical path data
- clustering unit for clustering target points according to clustering conditions, wherein the clustering unit sets a density threshold, sequentially traverses each target point, and clusters the target points according to the clustering condition to obtain at least one cluster.
- a touch point calculation unit for calculating a coordinate of a touch point and an area of the touch point
- the touch point calculation unit calculates a center coordinate of the target point in each cluster set and an area covered by the target point, and uses the center coordinate as a touch The coordinates of the point, the area covered by the target point as the area of the touch point.
- the touch point information extraction device includes:
- a target point search unit for finding a target point based on an attribute associated with the data element and the optical path and the optical path data
- a clustering unit for clustering target points according to clustering conditions
- An area judgment sheet for sequentially determining whether an area covered by each cluster set is larger than the area threshold
- the area judging unit sets an area threshold, and sequentially determines whether an area covered by each cluster set is larger than an area judging unit of the area threshold. If it is larger, the cluster set is used as a touch point. Otherwise, Discarding the cluster set and judging the next cluster set until all cluster sets are determined;
- a touch point calculation unit for calculating a coordinate of the touch point and an area of the touch point
- the touch point calculation unit calculates a center coordinate of the target point in each cluster set that is not discarded, and an area covered by the target point, and the The center coordinate is used as the coordinates of the touched point, and the area covered by the target point is taken as the area of the touched point.
- the infrared touch screen multi-point recognition system as described above, the system further comprising motion tracking means for tracking the movement of the touch point based on the distance between the position of the touch point at the previous moment and the position of the touch point at the current time.
- the invention provides a multi-point recognition method and system for infrared touch screen based on density clustering, by establishing an association between a data element of a pixel/data structure of an image and an optical path, and changing a pixel/data structure of the image through the optical path data.
- the number of optical paths associated with the data element is not limited to:
- the data element of the pixel/data structure of an image is marked as the target point, According to the density of the target point of the mark, set the density threshold, cluster the target points, and focus on one type of target point as a touch point, and set the target point without cluster as background, such a slave image pixel or array
- the target point is judged on the order of magnitude of the element, and the ghost point and the noise point can be effectively removed, and the recognition precision is high, and is suitable for the identification of any plurality of touch points.
- FIG. 1 is a structural block diagram of a multi-point identification system of an infrared touch screen in Embodiment 1;
- Embodiment 2 is a flow chart of a multi-point identification method of the infrared touch screen in Embodiment 1;
- FIG. 3 is a flow chart showing a method for establishing an attribute of a pixel of an image and an optical path on the infrared touch screen by the attribute establishing means in Embodiment 1;
- FIG. 4 is a schematic diagram of an attribute associated between a pixel and an optical path passing through the pixel in Embodiment 1;
- FIG. 5 is a flowchart of a method of extracting touch point information by the touch point information extracting apparatus in Embodiment 1;
- FIG. 6 is a flowchart of a method for finding a target point by a target point search unit in Embodiment 1;
- FIG. 7 is a schematic diagram of a distribution of target points found by a target point search unit on an image in Embodiment 1;
- FIG. 8 is a flowchart of a method for clustering target points by a clustering unit in Embodiment 1;
- FIG. 9 is a flowchart of a method for finding a target point by a target point search unit in Embodiment 2;
- Figure 10 is a block diagram showing the structure of a touch point information extracting apparatus in Embodiment 3.
- FIG. 11 is a flowchart of a method of extracting touch point information by the touch point information extracting apparatus in Embodiment 3; and FIG. 12 is a block diagram showing a configuration of a multi-point recognition system of the infrared touch screen in Embodiment 4.
- the embodiment provides a multi-point recognition system and a multi-point identification method for an infrared touch screen.
- the multi-point identification system includes a data collection device 1, an image generation device 2, an attribute establishment device 3, and touch point information extraction.
- the data acquisition device 1 is used to collect optical path data in one identification process.
- the image generating device 2 is configured to generate an image in a predetermined ratio to the size of the infrared touch screen.
- Attribute establishing means 3 for establishing a genus of pixels of said image associated with an optical path on said infrared touch screen Sex.
- the optical path determining unit 31 is configured to determine an optical path passing through each pixel according to the preset ratio and the direction of the optical path;
- the attribute recording unit 32 is configured to record the number of optical paths passing through each pixel and the position or serial number of the optical path passing through the pixel. .
- the touch point information extracting means 4 is configured to extract touch point information based on attributes associated with the optical path on the infrared touch screen and the optical path data.
- the target point searching unit 41 is configured to search for a target point according to an attribute and optical path data associated between the pixel and the optical path;
- the clustering unit 42 is configured to cluster the target point according to the clustering condition, and the clustering unit sets the density.
- Threshold traversing each target point in turn, clustering the target points according to the clustering conditions, to obtain at least one cluster set;
- the touch point calculating unit 44 is configured to use each cluster set as a touch point and calculate the touch point The coordinates and the area of the touched point; the touch point calculation unit 44 can calculate the center coordinate of the target point in each cluster set and the area covered by the target point, using the center coordinate as the coordinate of the touch point, and the area covered by the target point as the touch point Area.
- the motion tracking device 5 is for tracking the touch point motion based on the distance between the position of the touch point at the previous moment and the position of the touch point at the current time.
- a flowchart of a method for identifying multiple touch points by the system includes the following steps:
- the data collection device 1 collects optical path data in a recognition process.
- the optical path data includes an optical path between the infrared emitting element and the infrared receiving element that is collected after scanning, and the occlusion data can be represented by 1, and the unoccluded data can be represented by 0, then the optical path data is " A series of combinations of 0" and "1".
- the image generating device 2 generates an image with a preset ratio of the size of the infrared touch screen, that is, generates an image that is proportional to the size of the infrared touch screen, and the ratio of the image size and the infrared touch screen is preferably 1:1, and the image is It may be an image with a single color in the background, preferably the background color of the image is black.
- An attribute establishing device 3 is configured to establish an attribute associated with a pixel on the image and an optical path on the infrared touch screen.
- a method for specifically establishing a property associated with a pixel and an optical path includes the following steps:
- the optical path determining unit 31 determines the optical path passing through each pixel according to the preset ratio and the direction of the optical path.
- the optical path passing through each pixel is determined according to the direction of the optical path, and is not necessarily the optical path actually passing through the pixel, because some optical paths may not pass through the pixel due to the occlusion of the touch object, as long as the optical path passes through the pixel. That is, the optical path should include all optical paths scanned between the infrared emitting element and the infrared receiving element, including both the optical path blocked by the touch object and the optical path not blocked by the touch object.
- the attribute recording unit 32 records the number of optical paths passing through each pixel and the position or serial number of the optical path passing through the pixel.
- the optical path through each pixel includes an occluded and unobstructed optical path, and the association between the pixel and the optical path is established by recording the number of optical paths passing through each pixel and the position or number of the optical path, for example, for a pixel (50) , 50), if there are 3 optical paths passing through the pixel, the serial numbers of the three optical paths are: 8, 8, and 12, then the attributes of the pixel can be recorded as the form shown in Figure 4, of course. It can also be recorded in other forms.
- the touch point extraction device extracts touch point information according to an attribute of a pixel on the image and an optical path on the infrared touch screen and the optical path data.
- the method for extracting touch point information may include the following steps:
- the target point searching unit 41 searches for a target point according to an attribute associated with the pixel and the optical path and the optical path data.
- the target point search unit 41 changes an attribute associated between the pixel and the optical path according to the occlusion condition of the optical path data in one recognition process, and preferably changes the number of optical paths associated with the pixel when the optical path associated with the pixel When the number of conditions satisfies certain conditions, the pixel is marked as a target point. As shown in Figure 6, the specific method can be used to find the target point:
- the first optical path of the current pixel has not been traversed, the first optical path is traversed, otherwise, the second is traversed, and if the second is also traversed, the third is traversed, and so on.
- step 3 determining whether the current optical path is occluded, and if so, subtracting 1 from the number of optical paths associated with the current pixel, and proceeding to step 4, for example, the number of optical paths associated with the current pixel is five, and if the current optical path is blocked, then The number of optical paths associated with the current pixel is decremented by 1, that is, the optical path associated with the current pixel is changed to four; otherwise, directly proceeds to step 4, that is, if the current optical path is not occluded, no processing is performed, and the process proceeds directly to the next step. step.
- step 4 judge whether to traverse all the optical paths that have passed the current pixel, and if so, proceed to step 5; otherwise, go to step 2.
- the color of the target point may be marked as the background color of the image Different colors, for example, can be marked as white, go to step 6; otherwise, go directly to step 6.
- the above method may be more specifically described: traversing the first pixel, sequentially traversing the optical path associated with the pixel, that is, traversing the optical path passing through the pixel, for example, The number of optical paths associated with the pixel is 3, and it is determined whether the first optical path is occluded.
- the number of optical paths associated with the pixel is decreased by 1, that is, the number of optical paths associated with the pixel becomes 2; Whether the two optical paths are blocked, if occluded, the number of optical paths associated with the pixel is further reduced by 1, that is, the number of optical paths associated with the pixel becomes 1; continue to determine whether the third optical path is blocked, if occluded Then, the number of optical paths associated with the pixel is further reduced by one, that is, the number of optical paths associated with the pixel becomes zero. At this time, the pixel is marked as a target point, which can be marked as white, and then the next pixel is processed.
- the second method is continued to process the second pixel, the third pixel, ..., and so on. Until all pixels have been processed.
- FIG. 7 the schematic diagram shows the distribution of the searched target points on the image.
- the white point in the figure is the target point. It can be seen from the figure that except for a few isolated target points. , the found target points are gathered in different small areas.
- FIG. 6 is only a schematic diagram, and the distribution of actual target points may be different.
- the clustering unit 42 clusters the target points according to the clustering condition, so as to obtain at least one clustering set.
- the clustering condition is preferably whether the density in the neighborhood of the target point is greater than a set threshold, that is, setting a
- the density threshold is clustered by comparing the target point density in the neighborhood of the target point with the density threshold to obtain at least one cluster set.
- step 3 determining whether the target point density in the neighborhood of the target point of the current traversal is greater than a preset density threshold, and if so, using the target point as an element in a cluster set, proceeding to step 3; otherwise, discarding the target point After the cluster is set, go to step 3.
- step 3 Determine whether the target point has been traversed, and if so, end; otherwise, go to step 1.
- the neighborhood of the target point is not specifically limited, and may be determined according to actual conditions, and may be 4 neighborhoods, 8 neighborhoods, 16 neighborhoods, etc. of the current target point, or may be a circle centered on the target point.
- the radius can be 2 or 3 pixels, and can also be a square or a rectangle centered on the target point, and the length of the side is also determined according to actual needs.
- the completion of the clustering setup described above means that the cluster set is established, that is, no new elements are added to the cluster set, if the target point density in the neighborhood is greater than the set density threshold in the subsequent step. The target point is then placed in another cluster set.
- n is positive An integer that discards the target point until it traverses to a target point that does not satisfy the cluster set;
- each cluster set is a set of at least one target point that continuously satisfies the clustering condition
- the target point that does not satisfy the clustering condition is a demarcation point of the two cluster sets, for example, suppose a total of 50 search points are found.
- Target point if the first 10 meet the clustering conditions, then the 10 target points are elements in a cluster set, and the 11th and 12th target points do not satisfy the clustering condition, and the 13th to 25th target points If satisfied, then the 13th to 25th target points are the elements in the second cluster set, the 26th is not satisfied, the 27th to 50th target points are satisfied, and the 27th to 50th target points are the third Cluster the elements in the collection.
- the touch point calculation unit 44 treats each of the cluster sets as one touch point, and calculates coordinates of the touch point and an area of the touch point.
- the touch point calculation unit 44 calculates the center coordinates of the target points in each cluster set and the area covered by the target points, and takes the center coordinates of the respective cluster sets as the coordinates of the respective touch points, and uses the area covered by the target points as the touch point. Area, where the central coordinate can be the average coordinate of the target point in a cluster set.
- the motion tracking device 5 tracks the touch point motion according to the distance between the position of the touch point at the previous moment and the position of the touch point at the current time.
- the two positions are the trajectories of the same touch point at different times, and the movement of the touch point can be tracked by this method.
- the embodiment provides a multi-point recognition system for an infrared touch screen.
- the system processes the attributes associated between pixels and optical paths by means of density clustering, identifies target points on the order of pixels, and then clusters the target points. To identify touch points, the accuracy of touch recognition can be improved.
- the method for the target point searching unit 41 to search for the target point in step 2041 is to sequentially traverse each pixel, and determine whether the current pixel is the target point according to the occlusion condition of the optical path associated with the pixel.
- the light path of the touch point is occluded. Therefore, in order to quickly recognize the touch point, only the pixels through which the blocked light path passes can be judged, and other pixels do not need to be judged.
- the specific method for finding the target point is as follows:
- step 2 traversing the pixel through which the occluded optical path passes again, determining whether the number of optical paths passing through the current pixel becomes 0, and if so, marking the pixel as a target point, in order to distinguish the background color from the target point, the color of the target point Marked as a different color from the background color, for example, can be marked as white, go to step 3; otherwise, go directly to step 3;
- step 1 After the processing of step 1, the number of optical paths associated with the pixels through which the occluded optical path passes has changed, and then traversing the pixels processed in step 1, that is, traversing the pixels through which the occluded optical path passes, if The number of optical paths associated with the current pixel becomes 0, that is, the number of optical paths passing through the pixel becomes 0, the pixel is marked as a target point, and then proceeds to step 3, otherwise, directly proceeds to step 3.
- the touch point information extracting device 4 extracts the touched point information by clustering the identified target points to obtain a plurality of cluster sets, and each cluster set is taken as one Touch points, in the actual application process, even if a series of cluster sets are obtained according to density clustering, these cluster sets are not necessarily all touch points, and some small cluster sets may be due to occlusion of actual touch points.
- the touch point information extracting apparatus 4 may further include an area judging unit 43 for sequentially judging each cluster set to be covered.
- the area judging unit sets an area threshold, and sequentially determines whether an area covered by each cluster set is larger than an area judging unit of the area threshold, and if it is larger, the cluster set is As a touch point, otherwise, discard the cluster set and judge the next cluster set until all the clusters are judged.
- the collection of classes The collection of classes.
- the touch point information extracting means 4 extracts the touch point information based on the attribute associated with the optical path on the image and the optical path on the infrared touch screen, and the touch point information is replaced by the following method:
- the target point search unit 41 searches for a target point based on the attribute associated with the optical path on the infrared touch screen and the optical path data, and the search method of the specific target point can be the same as that of the first embodiment.
- the clustering unit 42 sets the density threshold, sequentially traverses each target point, and clusters the target points according to the clustering condition to obtain at least one cluster set.
- the specific clustering method is the same as that of the first embodiment.
- the area judging unit 43 sets an area threshold, and sequentially determines whether the area covered by each cluster set is greater than a set area threshold. If it is larger, the cluster set is used as a touch point. Otherwise, the area is discarded. Clustering the set, judging the next cluster set until all cluster sets are determined.
- the area covered by the target point in each cluster set is compared with the area threshold, if the area covered by the target point in the cluster set is smaller than the set area threshold, that is, if clustering
- the target point in the set satisfies the clustering condition, but the area of the cluster set is small, such a cluster set cannot be used as a touch point, which may be due to the mutual occlusion of the real touch point, and should be discarded, so that Can reduce ghost points.
- the touch point calculation unit 44 calculates the center coordinate of the target point and the area covered by the target point in each cluster set that are not discarded, and uses the center coordinate as the coordinate of the touch point, and the area covered by the target point is used as a touch The area of the point.
- the cluster set with a smaller coverage area is removed as a ghost point, and the touch precision is further improved.
- Embodiment 1 when the infrared touch screen multi-point recognition system performs the method of multi-point recognition, it is necessary to generate an image proportional to the size of the infrared touch screen, and then operate the pixels in the image, which involves The operation of numerical calculation of image pixels, convolution of images, and the like are generally time consuming.
- this embodiment provides another infrared touch screen multi-point recognition system, as shown in FIG.
- the multipoint identification system includes a data acquisition device ⁇ , a two-dimensional array generation device 2', an attribute establishment device 3', a touch point information extraction device 4', and a motion tracking device 5', wherein the attribute establishment device 3' includes an optical path
- Data Acquisition Device ⁇ Used to collect optical path data during a single identification process.
- the two-dimensional array generating device 2' is configured to generate a two-dimensional array of a predetermined ratio to the size of the infrared touch screen.
- the attribute establishing means 3' is configured to establish an attribute of the array element of the two-dimensional array associated with the optical path on the infrared touch screen.
- the optical path determining unit 3 is configured to determine an optical path passing through each array element according to the preset ratio and the direction of the optical path; the attribute recording unit 32' is configured to record the number of optical paths passing through each array element and the optical path passing through the array element. Location or serial number.
- the touch point information extracting means 4' is for extracting touch point information based on the attribute of the array element associated with the optical path on the infrared touch screen and the optical path data.
- the target point searching unit 4 is configured to search for a target point according to an attribute associated with the optical path between the array element and the infrared touch screen and the optical path data;
- the clustering unit 42' is configured to target the target point according to the clustering condition Performing clustering;
- the touch point calculation unit 44' is configured to use each cluster set as a touch point and calculate the coordinates of the touch point and the area of the touch point, and the touch point calculation unit 44' calculates the target point in each cluster set.
- the central coordinate and the area covered by the target point, the central coordinate is taken as the coordinate of the touched point, and the area covered by the target point is taken as the area of the touched point.
- the motion tracking device 5' is for tracking the touch point motion based on the distance between the position of the touch point at the previous moment and the position of the touch point at the current time.
- the method for identifying a plurality of touch points by the multipoint identification system provided in this embodiment is the same as the method of Embodiment 1, Embodiment 2 or Embodiment 3, except that the image generation device 2 is replaced with the two-dimensional array generation device 2'.
- the processing of all the pixels is changed to the processing of the array elements, and the pixels in the embodiment 1, the embodiment 2 or the embodiment 3 are all replaced by the array elements, and the following steps are specifically included:
- Data acquisition device ⁇ Collect optical path data during a recognition process
- the two-dimensional array generating device 2' generates a two-dimensional array that is at a preset ratio to the size of the infrared touch screen.
- the attribute establishing means 3' is for establishing an attribute of the array element of the two-dimensional array associated with the optical path on the infrared touch screen.
- the touch point information extracting means 4' is for extracting touch point information based on the attribute of the array element associated with the optical path on the infrared touch screen and the optical path data.
- the two-dimensional array in Embodiment 4 may also have other data structures having two-dimensional matrix arrangement properties, such as Two-dimensional vector.
- the present invention cover the modifications and the modifications of the invention
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CN102419663B (zh) * | 2011-08-03 | 2015-10-14 | 北京汇冠新技术股份有限公司 | 一种红外触摸屏多点识别方法及系统 |
CN102419664B (zh) * | 2011-08-03 | 2014-04-02 | 北京汇冠新技术股份有限公司 | 一种红外触摸屏的多点识别方法及系统 |
CN103885644A (zh) * | 2012-12-21 | 2014-06-25 | 北京汇冠新技术股份有限公司 | 一种提高红外触摸屏触摸精度的方法及其系统 |
CN103902104B (zh) * | 2012-12-25 | 2017-03-08 | 北京汇冠新技术股份有限公司 | 用于红外触摸屏的扫描数据解析方法及装置 |
CN103970360B (zh) * | 2013-01-30 | 2017-02-08 | 北京汇冠新技术股份有限公司 | 一种基于多点触摸的手势识别方法及系统 |
CN103399674B (zh) * | 2013-08-01 | 2016-05-18 | 广东威创视讯科技股份有限公司 | 一种多点触摸检测方法及装置 |
CN103699273B (zh) * | 2013-12-26 | 2016-09-21 | 广州视睿电子科技有限公司 | 红外触摸屏的触摸点识别方法及其系统 |
CN104238834B (zh) * | 2014-09-28 | 2020-03-20 | 青岛海信电器股份有限公司 | 一种提高触控灵敏度的方法及系统 |
CN104615311B (zh) * | 2015-02-10 | 2017-09-26 | 青岛海信电器股份有限公司 | 一种触摸屏定位方法、装置及触屏设备 |
CN106055169B (zh) * | 2016-07-29 | 2019-04-02 | 创业保姆(广州)商务秘书有限公司 | 基于检测点密度值的防误触方法与其智能快递柜 |
CN110794994A (zh) * | 2019-09-27 | 2020-02-14 | 深圳市天英联合教育股份有限公司 | 真实触点的确定方法及装置 |
CN114253417B (zh) * | 2021-12-02 | 2024-02-02 | Tcl华星光电技术有限公司 | 多触控点识别方法、装置、计算机可读介质及电子设备 |
CN114816130B (zh) * | 2022-06-29 | 2022-09-20 | 长沙朗源电子科技有限公司 | 电子白板的书写识别方法、系统、存储介质和电子白板 |
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