CN101639746B - Automatic calibration method of touch screen - Google Patents
Automatic calibration method of touch screen Download PDFInfo
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- CN101639746B CN101639746B CN2009100411953A CN200910041195A CN101639746B CN 101639746 B CN101639746 B CN 101639746B CN 2009100411953 A CN2009100411953 A CN 2009100411953A CN 200910041195 A CN200910041195 A CN 200910041195A CN 101639746 B CN101639746 B CN 101639746B
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Abstract
The invention relates to an automatic calibration method of an image sensor type touch screen, which comprises the following steps: (1) setting the A/D conversion gain amplification value of the image sensor as an initial value, and forbidding the original calibration parameters; (2) the automatic calibration routine draws a circular bright spot on a writing screen and records the center coordinate of the circular bright spot as a logic coordinate preset for calibration; (3) the automatic calibration routine sends an A/D conversion gain amplification value instruction for automatically adjusting the image sensor; (4) the microprocessor chip executes the instruction, calculates the physical coordinates of the gravity center of the effective bright spot and transmits the physical coordinates to an automatic calibration routine, and the PC sets the A/D conversion gain amplification value of the image sensor as an initial value; (5) repeating the operations of the steps (2), (3) and (4) for multiple times; (6) and obtaining new calibration parameters according to the logic coordinates for calibration and the corresponding physical coordinates of the center of gravity of the bright spot, and storing and starting the new calibration parameters. The invention eliminates the degree of freedom of manual touch and click in the prior method and can obtain more consistent calibration parameters.
Description
Technical field
The present invention relates to touch screen technology, be specifically related to a kind of automatic calibrating method of imageing sensor formula touch-screen.
Background technology
Touch-screen has all obtained widespread use in a lot of fields as a kind of simpler, ripe human-computer interaction device.The realization of touch screen technology mainly contains several kinds of modes such as resistance-type induction, capacitive induction, infrared tube scanning, imageing sensor at present.Image taking sensor formula touch-screen is example, and is as shown in Figure 1, and its formation comprises: at least one camera 1, at least one Zhi Guangxue lettering pen 2, at least one be used for the optics lettering pen the light wave imaging write screen 3, projector 4, little process chip 5 and PC 6.Said camera 1 comprises optical lens and imageing sensor.Said little process chip 5 can be single-chip microcomputer, ARM chip, dsp chip or MCU chip, is provided with image processing module and coordinate and handles computing module.Said camera 1 is connected with little process chip 5, and little process chip 5 also is connected with PC 6 through its built-in chip interface; Said projector 4 also is connected with PC 6.PC 6 is through the A/D conversion gain value of magnification of the chip interface may command imageing sensor of little process chip 5, thus the brightness value of scalable control chart image-position sensor images acquired.Wherein, optics lettering pen 2 can be a light pen, sends infrared light, monochromatic light or laser, and camera 1 has the monochromatic filter homochromy with this optics lettering pen 2.Optics lettering pen 2 also can be non-light source objects or passive pen, such as finger, the reasonable white simulation of reflecting effect pen etc., in this case; Optics lettering pen 2 relies on reflecting light to form picture point; The periphery of writing screen 3 is provided with monochromatic linear light source, and the light that monochromatic linear light source sends can cover whole viewing area of writing screen 3, and camera 1 has and the homochromy optical filter of this monochrome linear light source; If light-source brightness is enough, just do not need optical filter.Camera 1 is installed in the place ahead or the rear position of writing screen 3; Send or reflecting light by optics lettering pen 2; Be positioned at the camera 1 of writing screen 3 the place aheads or rear and receive the light spot image that light wave forms on image or the non-light source objects of writing on the screen 3, through imageing sensor conversion output digital image data.Said image processing module is provided with a brightness of image threshold values; The pixel brightness value and the luminance threshold contrast of the view data image processing module is changed imageing sensor through A/D after; The pixel that surpasses this luminance threshold is effectively to suppose touch point speck pixel; Simultaneously; Said image processing module is when receiving the DID that imageing sensor transmits, and the row that transmits through imageing sensor synchronously, field sync signal and pixel clock calculate the physical coordinates of the corresponding imageing sensor of each pixel of receiving, and image processing module buffer memory brightness value surpasses the touch point speck pixel coordinate of luminance threshold.Then, handling computing module by coordinate carries out the classification of hot spot pixel coordinate and calculates the hot spot barycentric coordinates.
After the touch-screen manufacturing is installed, before coming into operation, all need the process of a calibration.At present, the manual calibration method below general touch-screen adopts is: at first little process chip 5, camera 1 are connected to PC 6, the preset of getting n known logical coordinates on the touch-screen supplies the user to click; Obtain n the physical coordinates that the user clicks this n preset; According to physical coordinates that gets access to and the logical coordinates that is stored in each preset in the system in advance; Obtain calibration parameter through the method for undetermined coefficients; And the calibration parameter that obtains stored, can the calibration parameter that obtain be cured in the hardware memory of little process chip 5 of touch-screen or be stored in the touch-screen parameter configuration files in the PC 6.When touch-screen normally uses, combine calibration parameter to carry out calibrating coordinates interative computation, just can obtain the logical coordinates of the touch-screen of correspondence based on the calibrating coordinates algorithm as long as coordinate is handled the physical coordinates that the computing module computing obtains.
In the manual calibration method of above-mentioned existing imageing sensor formula touch-screen; Because the user is very big to the clicking operation degree of freedom of each preset; Has bigger error between the actual corresponding physical coordinate of preset physical coordinates and preset that has caused the imageing sensor sampling to calculate; Have bigger error thereby also make between preset physical coordinates that imageing sensor sampling calculates and the logical coordinates that is stored in each preset in the system in advance, obtain calibration parameter through the method for undetermined coefficients and also bigger error can occur.Calibration parameter computing meeting than mistake influences the degree of accuracy that system locatees, and has reduced the performance of system.Imageing sensor formula touch-screen can be front projection or back projection pattern, and the size of imageing sensor formula touch-screen can be accomplished very big, can be single large-sized touch-screen, also can be the touch system that a plurality of large scale touch-screens are spliced into.In the front projection touch-screen,, will cause the each use of user must manually carry out the calibration of n point touch panel coordinates if the position of imageing sensor or projector 4 is unfixing.Simultaneously, if great inconvenience than higher, bigger, will be brought to user's manual calibration operation in the position of screen.In the giant-screen touch system of a plurality of touch unit splicings, suppose that all there is n point each unit, just there is n * m some m unit, and point is too many, has also caused the difficulty and the uncertain situation of degree of accuracy of manual calibration.
Summary of the invention
The objective of the invention is to overcome the shortcoming and defect of above-mentioned prior art; A kind of automatic calibrating method of imageing sensor formula touch-screen is provided; The artificial degree of freedom of clicking that touches can obtain the comparison consistent calibration parameter when the inventive method had been got rid of conventional images sensor type touch screen calibration.
The object of the invention is realized through following technical proposals: the automatic calibrating method of imageing sensor formula touch-screen, at first the automatic alignment routine that is used for touch screen calibration is installed at PC, and this automatic calibrating method step is following:
(1) the A/D conversion gain value of magnification of PC imageing sensor is set to initial value; Can be made as zero; Make image processing module under surround lighting and the normal display environment of touch-screen, can not capture effective speck coordinate data, simultaneously, forbid the calibration parameter of former storage;
(2) said automatic alignment routine is the circular speck of r through projector writing the radius of drawing white or monochrome on the screen, and the central coordinate of circle of this circle speck of alignment routine record is as the logical coordinates that is intended for calibrating automatically;
(3) alignment routine is sent to little process chip and is regulated the instruction of imageing sensor A/D conversion gain value of magnification automatically automatically;
(4) the automatic adjusting imageing sensor A/D conversion gain value of magnification instruction transmitted of little process chip execution in step (3); Handle number of pixels that computing module detects effective speck coordinate and speck greater than preset empirical value up to coordinate; Coordinate is handled computing module and is gone out effective speck center of gravity physical coordinates and send said automatic alignment routine to according to the effective speck coordinate Calculation of detect to carry out record; Then, PC imageing sensor A/D conversion gain value of magnification is set to the described initial value of step (1);
(5) repeatedly order repeating step (2), (3) and (4) operation guarantees that all logical coordinatess that are intended for calibrating all collect corresponding speck center of gravity physical coordinates;
(6) automatically alignment routine is carried out computing according to each logical coordinates that is intended for calibrating that is write down and the corresponding speck center of gravity physical coordinates that is obtained thereof and is obtained new calibration parameter, and storage, launches new calibration parameter.
In the said method, the said calibration parameter that bans use of former storage of step (1) if former calibration parameter solidifies in the hardware memory of little process chip of touch-screen, is then handled the calibration parameter of this former storage of computing module forbidding by coordinate; If former calibration parameter is stored in the touch-screen parameter configuration files in the PC, then by said automatic this former calibration parameter of alignment routine forbidding.
In the said method, the said automatic alignment routine of step (1) is being write the circular speck that the radius of drawing on the screen is r through projector, and its radius r is preferably more than 10 picture numbers.
In the said method; The automatic adjusting imageing sensor A/D conversion gain value of magnification instruction that the said execution in step of step (4) (3) transmits; Handle number of pixels that computing module detects effective speck coordinate and speck greater than preset empirical value up to coordinate; Specifically: little process chip constantly increases progressively the value of magnification of the A/D conversion gain register of setting imageing sensor, handles number of pixels that computing module detects effective speck coordinate and speck greater than preset empirical value up to coordinate.
In the said method, the said preset empirical value of step (4) is the experiment experience value, can remove the noise of imageing sensor effectively and disturb.
In the said method, the said automatic alignment routine of step (6) is carried out computing according to each logical coordinates that is intended for calibrating that is write down and the corresponding speck center of gravity physical coordinates that is obtained thereof and is obtained new calibration parameter, specifically adopts the method for undetermined coefficients.
In the said method, the new calibration parameter of the said storage of step (6) specifically is that new calibration parameter is solidified in the hardware memory of little process chip of touch-screen, or is stored in the touch-screen parameter configuration files in the PC.
After obtaining storage behind the new calibration parameter, launch by said method; When touch-screen normally uses; Combine calibration parameter to carry out calibrating coordinates interative computation as long as coordinate is handled the physical coordinates that the computing module computing obtains, just can obtain the logical coordinates of the touch-screen of correspondence based on the calibrating coordinates algorithm.
The present invention has following advantage and effect with respect to prior art: the automatic calibrating method of imageing sensor formula touch-screen of the present invention; Through automatic alignment routine is set at PC, the logical coordinates that is intended for calibrating by this automatic alignment routine, and central coordinate of circle write screen for the circular speck of this predetermined logic coordinate is drawn on; Control the speck center of gravity physical coordinates that this circle speck is obtained in little processing by automatic calibration course again; Repeatedly repeat aforesaid operations, by the speck center of gravity physical coordinates that obtained of automatic alignment routine, obtain new calibration parameter again through the method for undetermined coefficients according to each logical coordinates that is intended for calibrating that is write down and correspondence thereof; Can be convenient and swift; Exactly imageing sensor formula touch-screen is calibrated, the artificial degree of freedom of clicking that touches can obtain the comparison consistent calibration parameter when having got rid of conventional images sensor type touch screen calibration; Make touch-screen stable performance in use, bearing accuracy can reach the precision of Default Value.When being used for touch system that a plurality of large scale touch-screens are spliced into, it just seems more convenient, quick with respect to existing manual calibration steps, has saved the calibration resource greatly, helps applying.
Description of drawings
Fig. 1 is the structural representation of conventional images sensor type touch-screen;
Fig. 2 is the FB(flow block) of the automatic calibrating method of imageing sensor formula touch-screen of the present invention;
Fig. 3 is the automatic calibration synoptic diagram of the imageing sensor formula touch-screen of front projection formula;
Fig. 4 is the automatic calibration synoptic diagram of the imageing sensor formula touch-screen of back projection type;
Fig. 5 is the automatic calibration synoptic diagram of the touch system that is spliced into of a plurality of large scale touch-screens.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is done to specify further, but embodiment of the present invention is not limited thereto.
Generally speaking, the automatic calibrating method of imageing sensor formula touch-screen of the present invention before calibrating, is installed the automatic alignment routine that is used for touch screen calibration at PC earlier, and automatic calibrating method of the present invention is as shown in Figure 2, and step is following:
(1) PC is set to initial value through the A/D conversion gain value of magnification of the chip interface imageing sensor of little process chip; Can be zero; Make image processing module under surround lighting and the normal display environment of touch-screen, can not capture effective speck coordinate data; Simultaneously, forbid the calibration parameter of former storage;
(2) said automatic alignment routine is the circular speck of r through projector writing the radius of drawing white or monochrome on the screen, and the central coordinate of circle of this circle speck of alignment routine record is as the logical coordinates that is intended for calibrating automatically;
(3) alignment routine is regulated the instruction of imageing sensor A/D conversion gain value of magnification through the chip interface of little process chip to little process chip transmission automatically automatically;
(4) the automatic adjusting imageing sensor A/D conversion gain value of magnification instruction transmitted of little process chip execution in step (3); Handle number of pixels that computing module detects effective speck coordinate and speck greater than preset empirical value up to coordinate; Coordinate is handled computing module and is gone out effective speck center of gravity physical coordinates according to the effective speck coordinate Calculation of detect; Send speck center of gravity physical coordinates to said automatic alignment routine and carry out record through the chip interface of little process chip is little; Then, PC imageing sensor A/D conversion gain value of magnification is set to the described initial value of step (1);
(5) repeatedly order repeating step (2), (3) and (4) operation guarantees that all logical coordinatess that are intended for calibrating all collect corresponding speck center of gravity physical coordinates;
(6) automatically alignment routine is carried out computing according to each logical coordinates that is intended for calibrating that is write down and the corresponding speck center of gravity physical coordinates that is obtained thereof and is obtained new calibration parameter, and storage, launches new calibration parameter.
In the said method, the said calibration parameter that bans use of former storage of step (1) if former calibration parameter solidifies in the hardware memory of little process chip of touch-screen, is then handled the calibration parameter of this former storage of computing module forbidding by coordinate; If former calibration parameter is stored in the touch-screen parameter configuration files in the PC, then by said automatic this former calibration parameter of alignment routine forbidding.
In the said method, the said automatic alignment routine of step (1) is being write the circular speck that the radius of drawing on the screen is r through projector, and its radius r is preferably more than 10 picture numbers.
In the said method; The automatic adjusting imageing sensor A/D conversion gain value of magnification instruction that the said execution in step of step (4) (3) transmits; Handle number of pixels that computing module detects effective speck coordinate and speck greater than preset empirical value up to coordinate; Specifically: little process chip constantly increases progressively the value of magnification of the A/D conversion gain register of setting imageing sensor, handles number of pixels that computing module detects effective speck coordinate and speck greater than preset empirical value up to coordinate.
In the said method, the said preset empirical value of step (4) is the experiment experience value, can remove the noise of imageing sensor effectively and disturb.
In the said method, the said automatic alignment routine of step (6) is carried out computing according to each logical coordinates that is intended for calibrating that is write down and the corresponding speck center of gravity physical coordinates that is obtained thereof and is obtained new calibration parameter, specifically adopts the method for undetermined coefficients.
In the said method, the new calibration parameter of the said storage of step (6) specifically is that new calibration parameter is solidified in the hardware memory of little process chip of touch-screen, or is stored in the touch-screen parameter configuration files in the PC.
After obtaining storage behind the new calibration parameter, launch by said method; When touch-screen normally uses; Combine calibration parameter to carry out calibrating coordinates interative computation as long as coordinate is handled the physical coordinates that the computing module computing obtains, just can obtain the logical coordinates of the touch-screen of correspondence based on the calibrating coordinates algorithm.
Specify the realization of touch-screen automatic calibrating method of the present invention below in conjunction with the concrete way of realization of touch-screen.
Imageing sensor formula touch-screen as shown in Figure 3, that this imageing sensor formula touch-screen is the front projection formula.Projector 4 is positioned over the place ahead of writing screen 3 with camera 1 grade, and optics lettering pen 2 (not shown)s adopt red laser, but the remote control mouse, and the monochromatic filter that camera 1 adopts is the optical filter of red laser wave band 650 nano narrow bands.Its automatically calibration adopt the above-mentioned automatic calibrating method of the present invention, as shown in Figure 2, wherein, the operation repetition of step (3), (4) and (5) 13 times, as shown in Figure 3, the circular speck of being drawn for these 13 times is followed successively by the circle of writing in the screen 3 7～19.
As shown in Figure 4, this imageing sensor formula touch-screen is a back projection imageing sensor formula touch-screen, and this back projection imageing sensor formula touch-screen is provided with rear reflector 20 and rear-projection base 21.Projector 4 is positioned over the rear of writing screen 3 with camera 1 grade; As be positioned in the rear-projection case; Optics lettering pen 2 adopts infrared lettering pen writing screen 3 enterprising running hand write operations, and the monochromatic filter that camera 1 adopts is the bandpass filter of 850-940 nanometer.Its automatically calibration adopt the above-mentioned automatic calibrating method of the present invention, as shown in Figure 2, wherein, the operation repetition of (3), (4) and (5) 13 times, as shown in Figure 4, the circular speck of being drawn for these 13 times is followed successively by the circle of writing in the screen 22～34.
Be illustrated in figure 5 as the touch system that a plurality of large scale touch-screens are spliced into, projector 4 is positioned in the rear-projection case of writing screen 3 rears with camera 1 grade, and the splicing of being made up of a n*m several such rear-projections shows touch system.Fig. 5 is specially the touch system that 2 large scale touch-screens are spliced into, and comprises touch-screen A and B.This touch system has also comprised the chip interface data analog input card 36 of Video Segmentation integrated circuit board 35 and the little process chip 5 of camera; Chip interface data analog input card 36 is connected to the camera 1 among touch-screen A and the B through little process chip 5; Chip interface data analog input card 36 is provided with a plurality of interfaces; Each interface is connected to the chip interface of a little process chip 5 through serial RS485 or RS232 bus; Thereby connect a camera 1 through little process chip 5, can pass through the interface position of the unit of display accordingly, the coordinate transform of camera 1 output is become the coordinate of splicing system.Video Segmentation integrated circuit board 35 is connected with PC 6, projector 4 through VGA or DVI interface.
The above-mentioned automatic calibrating method of the present invention is all adopted in touch-screen A in the above-mentioned splicing system and the automatic calibration of B, and is as shown in Figure 2, wherein, the operation repetition of (3), (4) and (5) 13 times.And; Calibration process between each touch-screen can be that what to walk abreast also can be serial; The chip interface data analog input card 36 of the little process chip 5 of camera and the communication between each camera are independent and parallel; As shown in Figure 5, the circular speck of being drawn for 13 times in touch-screen A repetition is followed successively by the circle of writing in the screen 37～49, and the circular speck of being drawn for 13 times in touch-screen B repetition is followed successively by the circle of writing in the screen 50～62.
The foregoing description is a preferred implementation of the present invention; But embodiment of the present invention is not limited by the examples; Other any do not deviate from change, the modification done under spirit of the present invention and the principle, substitutes, combination, simplify; All should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (9)
1. the automatic calibrating method of imageing sensor formula touch-screen is characterized in that: at first at PC the automatic alignment routine that is used for touch screen calibration is installed, this automatic calibrating method step is following:
(1) the A/D conversion gain value of magnification of PC imageing sensor is set to initial value, makes image processing module under surround lighting and the normal display environment of touch-screen, can not capture effective speck coordinate data, simultaneously, forbids the calibration parameter of former storage;
(2) said automatic alignment routine is the circular speck of r through projector writing the radius of drawing white or monochrome on the screen, and the central coordinate of circle of this circle speck of alignment routine record is as the logical coordinates that is intended for calibrating automatically;
(3) alignment routine is sent to little process chip and is regulated the instruction of imageing sensor A/D conversion gain value of magnification automatically automatically;
(4) the automatic adjusting imageing sensor A/D conversion gain value of magnification instruction transmitted of little process chip execution in step (3); Handle number of pixels that computing module detects effective speck coordinate and speck greater than preset empirical value up to coordinate; Coordinate is handled computing module and is gone out effective speck center of gravity physical coordinates and send said automatic alignment routine to according to the effective speck coordinate Calculation of detect to carry out record; Then, PC imageing sensor A/D conversion gain value of magnification is set to the described initial value of step (1);
(5) repeatedly order repeating step (2), (3) and (4) operation guarantees that all logical coordinatess that are intended for calibrating all collect corresponding speck center of gravity physical coordinates;
(6) automatically alignment routine is carried out computing according to each logical coordinates that is intended for calibrating that is write down and the corresponding speck center of gravity physical coordinates that is obtained thereof and is obtained new calibration parameter, and storage, launches new calibration parameter.
2. the automatic calibrating method of imageing sensor formula touch-screen according to claim 1; It is characterized in that: the said calibration parameter that bans use of former storage of step (1); If former calibration parameter solidifies in the hardware memory of little process chip of touch-screen, then handle the calibration parameter of this former storage of computing module forbidding by coordinate; If former calibration parameter is stored in the touch-screen parameter configuration files in the PC, then by said automatic this former calibration parameter of alignment routine forbidding.
3. the automatic calibrating method of imageing sensor formula touch-screen according to claim 1 and 2; It is characterized in that: the said automatic alignment routine of step (2) is passed through projector; Writing the circular speck that the radius of drawing on the screen is r, its radius r is greater than 10 picture numbers.
4. the automatic calibrating method of imageing sensor formula touch-screen according to claim 3; It is characterized in that: the automatic adjusting imageing sensor A/D conversion gain value of magnification instruction that the said execution in step of step (4) (3) transmits; Handle number of pixels that computing module detects effective speck coordinate and speck greater than preset empirical value up to coordinate; Specifically: little process chip constantly increases progressively the value of magnification of the A/D conversion gain register of setting imageing sensor, handles number of pixels that computing module detects effective speck coordinate and speck greater than preset empirical value up to coordinate.
5. the automatic calibrating method of imageing sensor formula touch-screen according to claim 1; It is characterized in that: the automatic adjusting imageing sensor A/D conversion gain value of magnification instruction that the said execution in step of step (4) (3) transmits; Handle number of pixels that computing module detects effective speck coordinate and speck greater than preset empirical value up to coordinate; Specifically: little process chip constantly increases progressively the value of magnification of the A/D conversion gain register of setting imageing sensor, handles number of pixels that computing module detects effective speck coordinate and speck greater than preset empirical value up to coordinate.
6. according to the automatic calibrating method of claim 1,2,4 or 5 described imageing sensor formula touch-screens, it is characterized in that: the said preset empirical value of step (4) is the experiment experience value.
7. the automatic calibrating method of imageing sensor formula touch-screen according to claim 6; It is characterized in that: the said automatic alignment routine of step (6) is carried out computing according to each logical coordinates that is intended for calibrating that is write down and the corresponding speck center of gravity physical coordinates that is obtained thereof and is obtained new calibration parameter, specifically adopts the method for undetermined coefficients.
8. the automatic calibrating method of imageing sensor formula touch-screen according to claim 1; It is characterized in that: the said automatic alignment routine of step (6) is carried out computing according to each logical coordinates that is intended for calibrating that is write down and the corresponding speck center of gravity physical coordinates that is obtained thereof and is obtained new calibration parameter, specifically adopts the method for undetermined coefficients.
9. according to the automatic calibrating method of claim 1,2,4,5,8 described imageing sensor formula touch-screens; It is characterized in that: the new calibration parameter of the said storage of step (6); Specifically be that new calibration parameter is solidified in the hardware memory of little process chip of touch-screen, or be stored in the touch-screen parameter configuration files in the PC.
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| CN102968208B (en) * | 2012-09-05 | 2015-10-07 | 广东威创视讯科技股份有限公司 | Battle array camera positioning image effective coverage, face adjustment way choice method and system |
| CN104345996B (en) * | 2014-10-28 | 2017-10-27 | 武汉麦塔威科技有限公司 | A kind of other interactive device of radar outlook |
| EP3425488B1 (en) * | 2017-07-03 | 2023-09-06 | Aptiv Technologies Limited | System and method for calibrating and predicting a touch position of a pointer on a touch-enabled unit |
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