CN103399674A - Method and device of multi-point touch detection - Google Patents
Method and device of multi-point touch detection Download PDFInfo
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Abstract
The invention discloses a method and device of multi-point touch detection. The method comprises the steps of setting color information of every scanning dimensionality on a touch screen, reading and calculating scanned shielding data of every scanning dimensionality on the touch screen, calculating the number N of the smallest touch points on the touch screen, converting the touch position and width information of every scanning dimensionality to line segments with colors and widths, drawing the line segments to form images, carrying out binarization processing on the images, recognizing the position and the area of each touch point in the images, determining all touch points in the images are real touch points if the number of the touch points in the images is equal to N, and sequencing recognized touch points according to the sequence of from larger area to smaller area and selecting the first N touch points as real touch points if the total number of the touch points in the images is larger than N. The invention further provides a device of multi-point touch detection. By means of the method and device of multi-point touch detection, multi-point touch on the touch screen can be accurately detected.
Description
Technical field
The embodiment of the present invention relates to the touching technique field, relates in particular to a kind of multipoint touch detection method and device.
Background technology
Along with the development of touching technique, touch-screen is widely used as a kind of human-computer interaction device simply and easily.The kind of touch-screen mainly comprises resistive touch screen, capacitive touch screen, surface acoustic wave touch screen, optical touch screen and infrared touch panel etc. at present.Wherein, infrared touch panel is to utilize the infrared grid of the various dimensions on X, Y-axis to locate touch point.
The touch point detection method of existing infrared touch panel, when only having a touch point, testing result is more accurate, but, when a plurality of touch point is arranged, tend to erroneous judgement occur, because existing detection technique can't accurately be identified real touch point and " terrible point ", this just causes testing result inaccurate.For above-mentioned reasons, the touch detection technical of existing infrared touch panel need to use the occasion of multiple point touching to lose efficacy at some, and for example many people play simultaneously, drawing etc., great like this use field of having limited infrared touch panel.
Therefore, be necessary to provide a kind of new detection method, address the above problem.
Summary of the invention
The embodiment of the present invention provides a kind of multipoint touch detection method and device, can accurately detect the multiple point touching on touch-screen.
The multipoint touch detection method that the embodiment of the present invention provides comprises: the colouring information that each scanning dimension on touch-screen is set; Read and calculate on described touch-screen the data of blocking that each dimension scans, the described data of blocking comprise touch location and width, calculate the minimum touch point number N on touch-screen; Convert touch location and the width information of each scanning dimension to color and width line segment, draw all line segments, form piece image; The image that obtains is carried out to binary conversion treatment, identify position and the area of each touch point in image; If in image, the number of touch point equals minimum touch point number N, determine that all touch points in image are true touch point; If in image, total number of touch point is greater than the number N of minimum touch point, sort according to area order from big to small in the touch point that will identify, choose sequence in the touch point of top n as real touch point.
The multiple point touching pick-up unit that the embodiment of the present invention provides comprises: module is set, be used to the colouring information of each scanning dimension on touch-screen is set; Computing module, be used to reading and calculate on described touch-screen the data of blocking that each dimension scans, the described data of blocking comprise touch location and width, according to the described data of blocking, calculate the minimum touch point number N on touch-screen; Image forming module, convert the line segment with color and width to for touch location and width information by each scanning dimension, draws all line segments, forms piece image; Image processing module, carry out binary conversion treatment for the image that described image forming module is formed, and identifies position and the area of each touch point in image; Judge module, for the number that judges described image touch point greater than still equaling described minimum touch point number N; Determination module, for when the number of described image touch point equals described minimum touch point number N, determine that all touch points in described image are true touch point, when the number of touch point in described image during greater than described minimum touch point number N, sorted according to area order from big to small in the touch point of identifying, choose sequence in the touch point of top n as real touch point.
As can be seen from the above technical solutions, the embodiment of the present invention has the following advantages:
In embodiments of the present invention, by the data of blocking to each dimension scanning on touch-screen, process, thereby obtain the area of each touch point, then the area order from big to small according to touch point sorts to the touch point of identifying, the touch point of the predetermined number that sequence is forward is elected real touch point as, because " terrible point " has the advantages that area is less, therefore, the embodiment of the present invention can detect real touch point exactly.
The accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below will the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is embodiment schematic diagram of multipoint touch detection method in the embodiment of the present invention;
Fig. 2 is color addition principle schematic in touch point in the embodiment of the present invention;
Fig. 3 is a partial schematic diagram of Fig. 2 touch point color addition principle;
Fig. 4 is embodiment schematic diagram of multiple spot Check processing in the embodiment of the present invention;
Fig. 5 is embodiment schematic diagram of multiple point touching pick-up unit in the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills, not making under the creative work prerequisite the every other embodiment that obtains, belong to the scope of protection of the invention.
The embodiment of the present invention provides a kind of multipoint touch detection method and device, can accurately detect the multiple point touching on touch-screen.
Refer to Fig. 1, in the embodiment of the present invention, embodiment of multipoint touch detection method comprises:
101, the colouring information of each scanning dimension on touch-screen is set;
In the present embodiment, can be according to horizontal and vertical upper each 3 dimensions, totally 6 dimensions arrange, and the color of each dimension can be set as RGB(0x80 successively, 0,0), RGB(0x40,0,0), RGB(0x20,0,0), RGB(0,0x80,0), RGB(0,0x40,0), RGB(0,0x20,0), real touch point color is necessary for RGB(0XE0,0XE0,0).
102, read and calculate on touch-screen the data of blocking that each dimension scans, calculate the minimum touch point number N on touch-screen;
Read and calculate on touch-screen the data of blocking that each dimension scans, block data and comprise touch location and width, calculate the number of blocking in data of blocking that scans on each dimension, according to the number of blocking of blocking on each dimension in data, calculate the minimum touch points N on touch-screen.
103, convert touch location and the width information of each scanning dimension to color and width line segment, draw all line segments, form piece image;
Wherein, the size of image can be set according to actual conditions, and image is larger, touches accuracy of detection higher, but corresponding processing speed is just slower.
104, this image is carried out to binary conversion treatment, identify position and the area of each touch point in image;
According to the color component of each pixel in image, image is carried out to binary conversion treatment, the position of each touch point of identification and the area of each touch point the image after processing.
105, in the judgement image number of touch point greater than still equaling minimum touch point number N, if greater than, perform step 106, if less than, perform step 107;
The minimum touch point number N that the touch point number that reality is identified and step 102 calculate compares, and in the touch point of identifying because of reality, may include " terrible point ", so the actual touch point number that identifies is likely greater than N.
106, sort according to area order from big to small in the touch point that will identify, choose sequence in the touch point of top n as real touch point;
When touch point number that reality identifies, during greater than N, illustrate in the touch point of identifying and include " terrible point ".Because " terrible point " has the little or shape of area, be the characteristics such as bar shaped, in the present embodiment, can according to area order from big to small, sort to all touch points of identifying, choose sequence in the touch point of top n as real touch point.
107, determine that all touch points in image are true touch point.
When touch point number that reality identifies equals N, illustrate in the touch point of identifying and do not contain " terrible point ", therefore, can determine that all touch points in image are true touch point.
In the present embodiment, by the data of blocking to each dimension scanning on touch-screen, process, thereby obtain the area of each touch point, then the area order from big to small according to touch point sorts to the touch point of identifying, the touch point of the predetermined number that sequence is forward is elected real touch point as, because " terrible point " has the advantages that area is less, therefore, the embodiment of the present invention can detect real touch point exactly.
For ease of understanding, the touch point color addition principle that below embodiment of the present invention is adopted describes, and specifically refers to Fig. 2.
In Fig. 2,207 is the positions at place, a real touch point, after on touch-screen, 207 places are touched, 208, the position at 209,210,211 places will have and block, and therefore, 208,209,210,211 these four positions will produce and disturb the detection of true touch point.
In order to detect true touch point, at first, 6 scanning dimensions are set to the different laggard line scannings of color, according to the vertically scanning of upper 3 dimensions, in figure, there are the corresponding data of blocking the position at 208 and 210 places on 201,202,203 3 dimensions; According to the transversely scanning of 3 dimensions, in figure, there are the corresponding data of blocking the position at 209 and 211 places on 204,205,206 3 dimensions; And all there are the corresponding data of blocking the position at 207 places on 201,202,203,204,205,206 6 dimensions.
The above-mentioned data of blocking comprise touch location and width, in the present embodiment, touch location and the width information that each can be scanned to dimension convert the line segment with color and width to, on same position, draw the line segment of multiple color, the color of this position can be made as the stack of the color of all scanning dimensions that satisfy condition, and the scanning dimension that meets prerequisite has the corresponding scanning dimension of blocking data for this position on this scanning dimension.
After the method drafting pattern picture that provides according to the present embodiment, as shown in Figure 3, the color that color component is dimension 201,202,203,204,205,206 correspondences is contained at 207 places, the color component that 208 and 210 places are contained is the color of dimension 201,202,203 correspondences, and the color component that 209 and 211 places are contained is the color of dimension 204,205,206 correspondences.
Image is carried out to binary conversion treatment, and the pixel that is about to satisfy condition in image is made as white, and the pixel that satisfies condition is the pixel that contains the color component of 6 dimensions, and other pixels are made as to black.
The method that provides according to this enforcement, after image is carried out to binary conversion treatment, in Fig. 3,207 places will form white color lump, 208,209,210,211 places all convert black to, 208,209,210,211 this in the binary conversion treatment process, will be filtered everywhere, therefore, can identify white color lump 207 and be real touch point.
The above has illustrated while only having a touch point, uses the method that the embodiment of the present invention provides to detect the process that touches, and while below introduction being had to a plurality of touch point, uses the method that the embodiment of the present invention provides to detect the process that touches, and refers to Fig. 4.
In Fig. 4,301 and 302 is touch points of two reality, according to the zone of being divided in Fig. 2,305 and 308 contain the color component of 204,205,206 3 dimensions in Fig. 2,306 and 307 contain the color component of 201,202,203 3 dimensions in Fig. 2, and 305 and 307 some overlapping region 303, namely contain the color component of 201,202,203,204,205,206 these 6 dimensions in 303,303 is likely true touch point.Same, 306 and 308 some overlapping region 304, also contain the color component of 201,202,203,204,205,206 these 6 dimensions so in 304, and 304 is likely also real touch point.This image, after binary conversion treatment, obtains 4 white color lumps, and four touch points are namely arranged, but 4 white color lump sizes there are differences, wherein, and 301 area maximums, 303 area minimums.
As can be known according to the touch data on each dimension that reads, on current 6 dimensions, the touch point number is respectively 2,2,2,2,2,2, maximal value is 2, gets maximal value in the touch point number of all dimensions on touch-screen as minimum touch point number, and minimum touch point number is that N is 2.Because the currently identified touch point number that goes out is 4, greater than minimum, touch and count 2, therefore, in the touch point of identifying, there is " terrible point ".
In the present embodiment, can adopt the method that all the white pixel point numbers in white color lump are added up to calculate the area of each white color lump.Because " terrible point " has the advantages that area is little, can preset an area according to actual conditions and filter threshold value, the white color lump of area in 4 white color lumps less than default threshold value first filtered out.For example, in the present embodiment, the area of white color lump 303, less than default threshold value, first filters out white color lump 303.Remaining white is sorted according to area order from big to small, i.e. the area maximum of white color lump 301, next 302, be finally 304.Choose sequence at the white color lump of first 2 as real touch point, according to said method, can obtain 301 and 302 is two real touch points, and 303 and 304 be two " terrible points ".
In the present embodiment, by the data of blocking to each dimension scanning on touch-screen, process, thereby obtain the area of each touch point, after area is filtered less than the touch point of default threshold value, sorted according to area order from big to small in remaining touch point, the touch point of the predetermined number that sequence is forward is elected real touch point as, because " terrible point " has the advantages that area is less, therefore, the embodiment of the present invention can detect real touch point exactly.
Below the multiple point touching pick-up unit in the embodiment of the present invention is described, refers to Fig. 3, in the embodiment of the present invention, the multiple point touching pick-up unit embodiment comprises:
Judge module 5050, for the number that judges the image touch point greater than still equaling described minimum touch point number N;
For ease of understanding, below with a practical application scene, the interactive mode between each module of the multiple point touching pick-up unit in the present embodiment is described:
In the present embodiment, module 501 is set can be by horizontal and vertical upper each 3 dimensions, and the color of totally 6 dimensions is set as RGB(0x80,0 successively, 0), RGB(0x40,0,0), RGB(0x20,0,0), RGB(0,0x80,0), RGB(0,0x40,0), RGB(0,0x20,0), real touch point color is necessary for RGB(0XE0,0XE0,0).
After module 501 be set set up the color of 6 dimensions, computing module 502 reads and calculates on touch-screen the data of blocking that each dimension scans, block data and comprise touch location and width, calculate the number of blocking in data of blocking that scans on each dimension, according to the number of blocking of blocking on each dimension in data, calculate the minimum touch points N on touch-screen.
For example, the number of blocking of blocking in data that scans on 6 dimensions is followed successively by 4,4,6,4,4,4, get on 6 dimensions, block the number maximum value 6 as the minimum points N that touch, namely in the present embodiment, N equals 6.
The number of the judge module 505 judgement image processing module 504 final white color lumps that form is greater than still equaling the minimum points N that touches.
According to the example of front, if minimum touch points N is 6, the number of the white color lump that identifies is 8, and the number of white color lump touches and counts greater than minimum, in the touch point of namely identifying, contains " terrible point ".At this moment, determination module 506 needs to determine final 8 the white color lumps area separately that forms of image processing module 504, in the present embodiment, determination module 506 can adopt the method that all the white pixel point numbers in each white color lump are added up to calculate the area of each white color lump.
Because " terrible point " has the advantages that area is little, determination module 506 can preset an area according to actual conditions and filter threshold value, the white color lump of area in 8 white color lumps less than default threshold value first filtered out, the white color lump that then will be left is according to area order sequence from big to small, choose sequence at the white color lump of first 6 as real touch point, remaining white color lump representative " terrible point ".
In the present embodiment, image processing module carries out binary conversion treatment by the image that image forming module is formed, thereby obtain the area of each touch point, determination module filters area less than the touch point of default threshold value after, sorted according to area order from big to small in remaining touch point, the touch point of the predetermined number that sequence is forward is elected real touch point as, because " terrible point " has the advantages that area is less, therefore, the multiple point touching pick-up unit that provides of the embodiment of the present invention can detect real touch point exactly.
It should be noted that in addition, device embodiment described above is only schematic, wherein said unit as the separating component explanation can or can not be also physically to separate, the parts that show as unit can be or can not be also physical locations, namely can be positioned at a place, or also can be distributed on a plurality of network element.Can select according to the actual needs wherein some or all of module to realize the purpose of the present embodiment scheme.In addition, in device embodiment accompanying drawing provided by the invention, the annexation between module represents between them to have communication connection, specifically can be implemented as one or more communication bus or signal wire.Those of ordinary skills in the situation that do not pay creative work, namely can understand and implement.
Through the above description of the embodiments, the those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential common hardware, can certainly comprise that special IC, dedicated cpu, private memory, special-purpose components and parts etc. realize by specialized hardware.Generally, all functions that is completed by computer program can realize with corresponding hardware at an easy rate, and, be used for realizing that the particular hardware structure of same function can be also diversified, such as mimic channel, digital circuit or special circuit etc.But under more susceptible for the purpose of the present invention condition, software program realizes it being better embodiment.based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in the storage medium that can read, floppy disk as computing machine, USB flash disk, portable hard drive, ROM (read-only memory) (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disc or CD etc., comprise that some instructions are with so that a computer equipment (can be personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
Above a kind of multipoint touch detection method and the device that the embodiment of the present invention is provided is described in detail, for one of ordinary skill in the art, thought according to the embodiment of the present invention, all will change in specific embodiments and applications, therefore, this description should not be construed as limitation of the present invention.
Claims (10)
1. a multipoint touch detection method, is characterized in that, comprises step:
1) colouring information of each scanning dimension on touch-screen is set;
2) read and calculate on described touch-screen the data of blocking that each dimension scans, the described data of blocking comprise touch location and width, calculate the minimum touch point number N on touch-screen;
3) convert touch location and the width information of each scanning dimension to color and width line segment, draw all line segments, form piece image;
4) image that step 3) is obtained carries out binary conversion treatment, identifies position and the area of each touch point in image, if in image total number of touch point greater than the number N of minimum touch point perform step 5); If in image, the number of touch point equals minimum touch point number N determines that all touch points in image are true touch point;
5) sort according to area order from big to small in the touch point of step 4) being identified, choose sequence in the touch point of top n as real touch point.
2. the method for claim 1, is characterized in that, described step 2) in calculate the minimum touch point number N on touch-screen mode be: get the maximal value in the touch point number of all dimensions on touch-screen.
3. the method for claim 1, it is characterized in that, the mode of the formation image in described step 3) is: the line segment of drawing multiple color on same position, the color of this position is made as the stack of the color of all scanning dimensions that satisfy condition, and the described scanning dimension that meets prerequisite is that described position has the corresponding scanning dimension of blocking data on described scanning dimension.
4. the method for claim 1, it is characterized in that, image binaryzation processing mode in described step 4) is: the pixel that will satisfy condition is made as white, the described pixel that satisfies condition is the pixel that contains the default all colours information of step 1), and other pixels are made as to black.
5. method as claimed in claim 4, it is characterized in that, in described step 5), the choosing method of true touch point is: will according to area order from big to small, be sorted by the white color lump that the pixel that satisfies condition forms, choose sequence at the white color lump of top n as real touch point.
6. method as claimed in claim 5, is characterized in that, the area of described white color lump is all the white pixel point number sums in white color lump.
7. method as claimed in claim 5, is characterized in that, described institute's adularescent color lump is sorted according to area order from big to small before, also comprise:
Filter area is less than the white color lump of default threshold value.
8. a multiple point touching pick-up unit, is characterized in that, comprising:
Module is set, be used to the colouring information of each scanning dimension on touch-screen is set;
Computing module, be used to reading and calculate on described touch-screen the data of blocking that each dimension scans, the described data of blocking comprise touch location and width, according to the described data of blocking, calculate the minimum touch point number N on touch-screen;
Image forming module, convert the line segment with color and width to for touch location and width information by each scanning dimension, draws all line segments, forms piece image;
Image processing module, carry out binary conversion treatment for the image that described image forming module is formed, and identifies position and the area of each touch point in image;
Judge module, for the number that judges described image touch point greater than still equaling described minimum touch point number N;
Determination module, for when the number of described image touch point equals described minimum touch point number N, determine that all touch points in described image are true touch point, when the number of touch point in described image during greater than described minimum touch point number N, sorted according to area order from big to small in the touch point of identifying, choose sequence in the touch point of top n as real touch point.
9. device as claimed in claim 8, is characterized in that, described image processing module to the mode that described image carries out binary conversion treatment is:
The pixel that satisfies condition is made as to white, and the described pixel that satisfies condition is the pixel that contains all colours information that the module setting is set, and other pixels are made as to black.
10. device as claimed in claim 9, is characterized in that, the number of described determination module touch point in described image determines that the method for true touch point is during greater than described minimum touch point number N:
To according to area order from big to small, be sorted by the white color lump that the pixel that satisfies condition forms, choose sequence at the white color lump of top n as real touch point, the area of described white color lump is all the white pixel point number sums in white color lump.
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