CN103294316A - Touch positioning system - Google Patents
Touch positioning system Download PDFInfo
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- CN103294316A CN103294316A CN2013102006953A CN201310200695A CN103294316A CN 103294316 A CN103294316 A CN 103294316A CN 2013102006953 A CN2013102006953 A CN 2013102006953A CN 201310200695 A CN201310200695 A CN 201310200695A CN 103294316 A CN103294316 A CN 103294316A
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Abstract
The invention relates to the technical field of touch, in particular to a touch positioning system. The touch positioning system comprises a multi-path camera, an acquisition chip and a master chip. The multi-path camera is used for shooting touch images. The acquisition chip is used for acquiring the touch images of the multi-path camera, extracting possible light spots according to the touch images, and transmitting the possible light spots to the master chip. The master chip is used for extracting effective light spots according to the possible light spots, calculating to obtain touch point coordinates according to the effective light spots, and transmitting the touch point coordinates to a computer system for touch operation execution. The acquisition chip performs data acquisition to the multi-path camera and transmits the extracted useful possible light spot data to the master chip, data transmission amount between the acquisition chip and the master chip is reduced, calculating burden of the master chip is reduced, and the coordinates calculated by the master chip are transmitted to the computer system for execution. By the novel hardware structure, stratified data extraction is achieved, data transmission amount is reduced, transmission efficiency is increased, image processing speed is increased, and high touch frame rate is guaranteed.
Description
Technical field
The present invention relates to the touching technique field, be specifically related to a kind of touching and positioning system.
Background technology
It is very big convenient that having brought to people appears in touching technique, and particularly the multiple point touching The Application of Technology is given to touch to experience and brought qualitative leap, has greatly improved interpersonal interactivity.
Existing touching technique generally comprises infrared scan and touches and optical touch.When optical touch screen is realized multiple point touching if desired, need use 3 tunnel and above camera to carry out the collection of image.Because the data volume of each road camera is bigger, touch apparatus is subjected to the restriction of hardware, touch apparatus self generally can't directly calculate the touch point coordinate, existing a kind of disposal route is to adopt single-chip to calculate, but single-chip is in the face of the big touch data of data volume, it still can't calculate the touch coordinate point fast, even and if can calculate touch coordinate point and also can't realize multiple point touching.So data acquisition is that the data upload that collects from camera of simple handle is calculated the touch point to the PC end in the existing optical touch screen, the particular hardware framework as shown in Figure 1, calculating acquisition touch coordinate need be returned to touch apparatus after the method was sent to computing machine with the camera data, sent in the computer system by touch apparatus again and carry out, it is slow excessively that the method causes touching frame per second, and computing machine send the touch point coordinate of multiple point touching need write corresponding driving to computer system after calculating touch coordinate, construction cycle is long, and effect is bad, unstable, free drive can't be realized, plug and play can not be realized.
Summary of the invention
The technical matters that the present invention solves is to overcome the deficiencies in the prior art, and a kind of touching and positioning system that can guarantee higher touch frame per second is provided.
For solving the problems of the technologies described above, technical scheme of the present invention is as follows:
A kind of touching and positioning system comprises:
Be used for taking the multichannel camera that touches image;
Be used for gathering the touch image of multichannel camera and extract the acquisition chip that the possibility hot spot is sent to master chip according to touching image;
Be used for according to may extracting effective hot spot by hot spot, the touch point coordinate that calculates according to effective hot spot, and the touch point coordinate sent into the master chip of carrying out touch operation in the computer system.
Compared with prior art, the beneficial effect of technical solution of the present invention is:
Among the present invention the processing that touches locator data is all realized by hardware system, it at first adopts acquisition chip to carry out the data acquisition of multichannel camera, and the image that collects is carried out rough handling will come out to calculating the useful possible hot spot data extract of touch point coordinate, and the data that this may hot spot are sent to master chip, can reduce the volume of transmitted data between acquisition chip and the master chip like this, and the computational burden of minimizing next stage master chip, master chip comes out to send to computer system to the coordinate Calculation of touch point according to the possible hot spot data that collect and carries out, this new hardware structure has carried out stratified extraction to data, reduced volume of transmitted data, improved transfer efficiency, improve the speed that image is handled, can guarantee higher touch frame per second.
Description of drawings
Fig. 1 is the hardware structure of touching and positioning system in the prior art;
Fig. 2 is hardware structure of the present invention;
The hot spot schematic diagram data that does not have the touch point that Fig. 3 collects for acquisition chip;
The hot spot schematic diagram data that a touch point is arranged that Fig. 4 collects for acquisition chip;
The hot spot schematic diagram data that two touch points are arranged that Fig. 5 collects for acquisition chip;
The hot spot schematic diagram data of Fig. 6 after for master chip cancelling noise point;
Fig. 7 carries out the hot spot schematic diagram data that multiple spot is judged for master chip.
Embodiment
Below in conjunction with drawings and Examples technical scheme of the present invention is described further.
The present invention is satisfying under the situation of multiple point touching, utilize the data of gathering the multichannel camera, and the coordinate points that can go out touch according to the data computation that collects, above work all realize by hardware system shown in Figure 2, such advantage with can guarantee high touch frame per second.
As shown in Figure 2, a kind of touching and positioning system comprises multichannel camera, acquisition chip, master chip and computing machine, wherein,
The multichannel camera is used for taking the touch image, and wherein the data of camera can arrange according to the practical application needs, be traditionally arranged to be two or more;
Acquisition chip is used for gathering the touch image of multichannel camera and may be sent to master chip by hot spot according to touching the image extraction;
Master chip is used for according to may extracting effective hot spot by hot spot, the touch point coordinate that calculates according to effective hot spot, and the touch point coordinate sent into the master chip of carrying out touch operation in the computer system.
In specific embodiment, acquisition chip carries out preliminary judgement to the touch image that collects, this preliminary judgement can weed out some useless data, and the data that this is useful send the processing that master chip carries out next stage to coming out to calculating the useful data extract of touch point coordinate.This hardware structure has reduced the volume of transmitted data between acquisition chip and the master chip, but also reduced the computational burden of next stage master chip, make master chip only just can calculate the coordinate figure of touch point according to useful data, improve image processing speed, can guarantee higher touch frame per second.And, master chip is returned to master chip after need not the hot spot data transmission calculated the touch point to the computing machine again, master chip send the computer system executable operations again, but master chip directly gets access to and directly passes to computer system behind the coordinate figure of touch point and carry out touch operation, and treatment step is simple directly fast.
In an embodiment, for the multiple point touching technology that realizes that free drive is moving, master chip is sent into the touch point coordinate in the computer system with the pattern of USB human interface device (HID).During specific implementation, be built-in with human interface device descriptor (being the HID device descriptor) in the master chip, computing machine reads human interface device descriptor in the master chip by its inner general driving program, and master chip is identified as the USB human interface device.So, thus master chip is uploaded to the coordinate figure of touch point in the computing machine as HID equipment realizes that free drive is moving, plug and play.
As preferred embodiment a kind of, because therefore the collection of camera and arrange and need some comparatively complicated sequential, can utilize the work schedule of acquisition chip control multichannel camera.
In a most preferred embodiment, acquisition chip is FPGA, and FPGA can produce the sequential of stable and accurate collection and control camera to be come camera is realized sequential control.
Acquisition chip is responsible for gathering and is touched image and carry out simple hot spot extraction computing.One preferred embodiment in, set in advance the light intensity threshold value in the acquisition chip, it will touch light intensity in the image and extract formation greater than the continuous image vegetarian refreshments of light intensity threshold value and may be sent to master chip by hot spot.As shown in Figure 3, be the hot spot data that do not have the touch point of acquisition chip collection, wherein x direction unit is pixel cell, and the y direction is pixel intensity value, and as seen from Figure 3, when not having the touch point, the intensity level that each pixel collects is lower.When the touch point occurring, the image that collects as shown in Figure 4, the intensity level of touch point is higher as can be seen.Therefore, a light intensity threshold value can rule of thumb be set, dotted line as shown in Figure 4 is the light intensity threshold value, acquisition chip can extract possible hot spot according to thresholding algorithm, at this moment, acquisition chip utilizes the light intensity threshold value will touch the pixel that light intensity in the image is higher than the light intensity threshold value and is judged as effective hot spot data, and the pixel that is lower than the light intensity threshold value is judged as invalid hot spot data, and acquisition chip comes out to form possible hot spot with effective hot spot data extract and transfers to master chip.Because acquisition chip has been rejected invalid hot spot data, make the data that from acquisition chip, transfer to master chip significantly reduce, reduced master chip reads data from acquisition chip time.
Master chip is further handled from the laggard row of data that acquisition chip reads the possibility hot spot, and whether be that actual touch point cause or noise causes if judging possibility hot spot data.And relate to multiple point touching, master chip also need to judge hot spot point whether be caused by a touch point or caused by two or more touch points, calculate the coordinate figure that obtains the touch point according to the hot spot data that judge at last again.In a preferred implementation, in order to realize above-mentioned functions, set in advance width threshold value in the master chip, first slope threshold value and second slope threshold value, the width that it calculates each possibility hot spot according to pixel starting position and the pixel end position of possibility hot spot, then width is extracted the light intensity of each pixel of calculating greater than the possible hot spot of width threshold value, calculate the slope of each pixel according to light intensity, the slope of each pixel is compared with first slope threshold value and second slope threshold value, with slope greater than the pixel of first slope threshold value as the hot spot section start, with slope less than the pixel of second slope threshold value as hot spot end, obtain effective hot spot, calculate the coordinate figure of touch point according to effective hot spot, width threshold value wherein, first slope threshold value and second slope threshold value are empirical value, first slope threshold value〉0〉second slope threshold value.In this embodiment, master chip judges hot spot whether to be noise spot according to spot width.The width of possible hot spot is the difference of possible hot spot pixel starting position and pixel end position, when may spot width judging that then this possibility hot spot is very effective touch point during greater than width threshold value, when may spot width judging that then this possibility hot spot is noise spot during less than width threshold value, wherein, width threshold value is empirical value.Master chip extracts the hot spot data of very effective touch point correspondence and carries out next step multiple spot judgement.As shown in Figure 5, find out obviously to comprise two hot spots in these hot spot data that judge the hot spot data that extract as shown in Figure 6 by utilizing width threshold value, need master chip to judge whether there are a plurality of hot spots in these data according to slope this moment.Particularly, master chip is asked for the intensity of pixel according to the hot spot data of very effective touch point correspondence, calculate the corresponding slope of each pixel according to the intensity of pixel, as passing through formula A(i)=Value(i+1)-Value(i-1) calculate, wherein, A(i) i corresponding slope of pixel of expression, Value(i) i intensity values of pixels of expression, as A(i)〉during first slope threshold value, think that then this pixel is the place that begins of a hot spot, when A (i)＜second slope threshold value, think that then this pixel is the end of a hot spot.As shown in Figure 7, judge the 1st dotted line place slope greater than first slope threshold value, think that then this is that hot spot begins the place, judge the 2nd dotted line place less than second slope threshold value, think that then this is hot spot end.Algorithm can be distinguished as two hot spots to the data of obtaining from acquisition chip thus, i.e. two touch points.Last master chip is according to the coordinate figure of the corresponding touch point of the hot spot data computation of telling, and says that as HDI equipment the touch point coordinate figure is sent in the computing machine, realizes master chip plug and play on computers, do not need install driver.In a preferred embodiment, master chip can adopt ARM to realize, also can adopt other chips that possess corresponding function to realize.
Claims (7)
1. a touching and positioning system is characterized in that, comprising:
Be used for taking the multichannel camera that touches image;
Be used for gathering the touch image of multichannel camera and extract the acquisition chip that the possibility hot spot is sent to master chip according to touching image;
Be used for according to may extracting effective hot spot by hot spot, the touch point coordinate that calculates according to effective hot spot, and the touch point coordinate sent into the master chip of carrying out touch operation in the computer system.
2. touching and positioning system according to claim 1 is characterized in that, master chip is with the pattern of USB human interface device the touch point coordinate to be sent in the computer system.
3. touching and positioning system according to claim 1 is characterized in that, sets in advance the light intensity threshold value in the acquisition chip, and it will touch light intensity in the image and extract formation greater than the continuous image vegetarian refreshments of light intensity threshold value and may be sent to master chip by hot spot.
4. touching and positioning system according to claim 1, it is characterized in that, set in advance width threshold value in the master chip, first slope threshold value and second slope threshold value, the width that it calculates each possibility hot spot according to pixel starting position and the pixel end position of possibility hot spot, then width is extracted the light intensity of each pixel of calculating greater than the possible hot spot of width threshold value, calculate the slope of each pixel according to light intensity, the slope of each pixel is compared with first slope threshold value and second slope threshold value, with slope greater than the pixel of first slope threshold value as the hot spot section start, with slope less than the pixel of second slope threshold value as hot spot end, obtain effective hot spot, calculate the coordinate figure of touch point according to effective hot spot.
5. touching and positioning system according to claim 1 is characterized in that, the work schedule of multichannel camera is controlled by acquisition chip.
6. according to each described touching and positioning system of claim 1 to 5, it is characterized in that described acquisition chip is FPGA.
7. according to each described touching and positioning system of claim 1 to 5, it is characterized in that described master chip is ARM.
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| CN201310200695.3A CN103294316B (en) | 2013-05-27 | 2013-05-27 | A kind of touching and positioning system |
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| CN201310200695.3A CN103294316B (en) | 2013-05-27 | 2013-05-27 | A kind of touching and positioning system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021249131A1 (en) * | 2020-06-09 | 2021-12-16 | 京东方科技集团股份有限公司 | Touch-control display driving module and method, and display apparatus |
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| CN102298471A (en) * | 2009-03-06 | 2011-12-28 | 孙倩倩 | Optical touch screen |
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| CN102880356A (en) * | 2012-09-13 | 2013-01-16 | 福州锐达数码科技有限公司 | Method for realizing dual-pen writing based on electronic white board |
| CN103076928A (en) * | 2012-12-28 | 2013-05-01 | 上海易视计算机科技有限公司 | Method and device for identifying light spots of electronic whiteboard based on optical film combined image sensor |
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2013
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Patent Citations (5)
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| CN102298471A (en) * | 2009-03-06 | 2011-12-28 | 孙倩倩 | Optical touch screen |
| CN101980120A (en) * | 2010-10-22 | 2011-02-23 | 广东威创视讯科技股份有限公司 | Screen surface positioning device and implementation method thereof |
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| CN102880356A (en) * | 2012-09-13 | 2013-01-16 | 福州锐达数码科技有限公司 | Method for realizing dual-pen writing based on electronic white board |
| CN103076928A (en) * | 2012-12-28 | 2013-05-01 | 上海易视计算机科技有限公司 | Method and device for identifying light spots of electronic whiteboard based on optical film combined image sensor |
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| WO2021249131A1 (en) * | 2020-06-09 | 2021-12-16 | 京东方科技集团股份有限公司 | Touch-control display driving module and method, and display apparatus |
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Address after: Kezhu road high tech Industrial Development Zone, Guangzhou city of Guangdong Province, No. 233 510670 Patentee after: Wei Chong group Limited by Share Ltd Address before: 510663 No. 6, color road, hi tech Industrial Development Zone, Guangdong, Guangzhou, China Patentee before: Guangdong Weichuangshixun Science and Technology Co., Ltd. |
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