CN102750043A - Image processing method of optical touch system - Google Patents
Image processing method of optical touch system Download PDFInfo
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- CN102750043A CN102750043A CN2011100999661A CN201110099966A CN102750043A CN 102750043 A CN102750043 A CN 102750043A CN 2011100999661 A CN2011100999661 A CN 2011100999661A CN 201110099966 A CN201110099966 A CN 201110099966A CN 102750043 A CN102750043 A CN 102750043A
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Abstract
The invention relates to an image processing method of an optical touch system. The image processing method comprises the following steps of: extracting an operation image, and generating a brightness oscillogram representing the operation image; selecting a target signal of the brightness oscillogram according to brightness information of the brightness oscillogram; calculating at least one rising slope and at least one descending slope of the target signal; and selecting the target signal as an object signal if the absolute value of the rising slope and the absolute value of the descending slope are more than a threshold value. According to the invention, the accuracy of an optical touch screen can be improved.
Description
Technical field
The present invention relates to a kind of image processing method, the image processing method of particularly a kind of optical touch system.
Background technology
Touch-controlled screen device is a kind of electronic installation that conveniently lets the user directly on screen, carry out input operation.After pointer (stylus), finger tip or other fellows touched screen, touch-controlled screen device can detect and calculate and produce the position of touching, and exports coordinate to computer system, to let computer system carry out follow-up computing.
The optical touch screen is common a kind of in the touch-controlled screen device of having developed.A kind of optical touch screen comprises light supply apparatus and camera head (camera) usually.Light supply apparatus and camera head can be arranged, and make when object contact optical Touch Screen, to produce occlusion image at camera head.When no object contact optical Touch Screen, the image that camera head extracted can produce a background luminance waveform 11, and is as shown in Figure 1; And when object contact optical Touch Screen, the image that camera head extracted then can produce the brightness waveform 12 that comprises mask signal 121.
When object contact optical Touch Screen, possibly change the light reflection way, thereby produce glitch.For example, object possibly cause the distortion of Touch Screen, thereby light is reflexed to camera head, thereby produces a heliogram 13, perhaps changes former reflection of light, and produces a false mask signal (false lightshielding signal) 14.False mask signal 14 possibly judged by accident by object to produce, and calculates wrong object coordinate, maybe can cause the erroneous judgement of number of items and the miscount of object true coordinate.
Therefore be necessary to provide a kind of new method, overcome the problem that the known optical Touch Screen is easy to generate glitch.
Summary of the invention
In order to solve the problems referred to above that prior art exists, one embodiment of the invention provides the image processing method of a kind of optical touch system, comprises the following step: extract an application drawing picture, and produce a brightness waveform figure who represents this application drawing picture; According to the monochrome information of this brightness waveform figure, select the echo signal of this brightness waveform figure; Calculate at least one rate of rise and at least one descending slope of this echo signal; And if the absolute value of the absolute value of this rate of rise and this descending slope all greater than a threshold value, then selecting this echo signal is an object signal.
Another embodiment of the present invention discloses the image processing method of a kind of optical touch system, comprises the following step: extract a background image, and produce a background luminance oscillogram of representing this background image; Extract an application drawing picture, and produce a brightness waveform figure who represents this application drawing picture; According to the monochrome information of this brightness waveform figure, select the echo signal of this brightness waveform figure; Calculate one first monochrome information of this echo signal; Calculating is on this background luminance oscillogram, to one second monochrome information of a background signal that should echo signal; And if a ratio of this second monochrome information and this first monochrome information greater than a threshold value, then selecting this echo signal is an object signal.
Yet another embodiment of the invention discloses the image processing method of a kind of optical touch system, comprises the following step: extract a background image, and produce a background luminance oscillogram of representing this background image; Extract an application drawing picture, and produce a brightness waveform figure who represents this application drawing picture; According to the monochrome information of this brightness waveform figure, select one first echo signal and one second echo signal; Calculate one first monochrome information of this first echo signal and one second monochrome information of this second echo signal; Calculating on this background luminance oscillogram, the 3rd monochrome information of a background signal that mutually should first echo signal; Calculating on this background luminance oscillogram, the 4th monochrome information of a background signal that mutually should second echo signal; And if this first monochrome information, is got a new application drawing picture greater than the 3rd monochrome information and this second monochrome information during less than the 4th monochrome information.
The present invention can improve the degree of accuracy of optical touch screen.
Preceding text are sketch out the application's technical characterictic and advantage, is able to obtain preferable understanding so that the application of hereinafter describes in detail.Other technical characterictic and the advantage that constitute the application's claim target will be described in hereinafter.Under the application in the technical field those of ordinary skill should understand, the notion that hereinafter discloses can be used as the basis with specific embodiment and revises or design other structure or technology quite easily and realize the purpose identical with the application.Those of ordinary skill also should be understood in the affiliated technical field of the application, the construction of this type equivalence and the spirit and the scope that can't break away from appended the application that claim proposed.
Description of drawings
Fig. 1 is a line chart, and it shows a background luminance waveform and the brightness waveform that in an application drawing picture, obtains;
Fig. 2 is the synoptic diagram of the optical touch system of demonstration one embodiment of the invention;
Fig. 3 is the synoptic diagram of the optical touch system of demonstration another embodiment of the present invention;
Fig. 4 is the block schematic diagram of the touch-control system of demonstration one embodiment of the invention;
Fig. 5 is a process flow diagram, and it shows the step of image processing method of a kind of optical touch system of one embodiment of the invention;
Fig. 6 is a process flow diagram, and it shows the step of image processing method of a kind of optical touch system of another embodiment of the present invention;
Fig. 7 is a process flow diagram, and it shows the step of the image processing method of one embodiment of the invention;
Fig. 8 is for showing a brightness waveform figure of one embodiment of the invention;
Fig. 9 is the synoptic diagram of the echo signal of demonstration one embodiment of the invention;
Figure 10 is the synoptic diagram of the echo signal of demonstration one embodiment of the invention;
Figure 11 is the synoptic diagram of the mask signal of demonstration one embodiment of the invention;
Figure 12 is for showing the background luminance oscillogram of one embodiment of the invention; And
Figure 13 is the application drawing picture of demonstration one embodiment of the invention and the luminance difference distribution plan of background image.
Description of reference numerals in the above-mentioned accompanying drawing is following:
2 optical touch systems
3 optical touch systems
8 brightness waveform figure
9 background luminance oscillograms
11 background luminance waveforms
12 brightness waveform
13 heliograms
14 false mask signals
21 sensors
22 first light-projecting components
23 second light-projecting components
24 the 3rd light-projecting components
25 processing units
26 touching surfaces
27 objects
34 light-projecting components
35 touching surfaces
41 image processors
42 calculation elements
81 echo signals
81 ' background signal
82 mask signals
82 ' background signal
83 echo signals
83 ' background signal
121 mask signals
131 difference signals
132 difference signals
133 difference signals
812 first sections
813 second sections
814 straight lines
815 straight lines
816 straight lines
817 straight lines
821 rising edges
822 straight lines
823 drop edges
824 straight lines
8111 points
8112 points
8113 points
8114 points
8115 points
8116 points
8117 points
8121 rising edges
8122 drop edges
8211 points
8212 points
8213 points
8214 points
S51～S55 process step
S61～S69 process step
S71～S80 process step
Embodiment
Fig. 2 is the synoptic diagram of the optical touch system 2 of demonstration one embodiment of the invention.With reference to shown in Figure 2, optical touch system 2 comprises a sensor 21, one first light-projecting component (light providingmember) 22,1 second light-projecting component 23, one the 3rd light-projecting component 24 and a processing unit 25.First light-projecting component 22, second light-projecting component 23 and the 3rd light-projecting component 24 center on a sensing region at touching surface (touchsurface) 26.Sensor 21 is provided with to detect the activity of touching (touch activity) in the sensing region.Processing unit 25 couples sensor 21, and according to the image that sensor 21 produces, analyzes the coordinate at object 27 places.
In one embodiment, first light-projecting component 22 comprises a minute surface, and this minute surface is towards sensing region.Second light-projecting component 23 and the 3rd light-projecting component 24 can be light-emitting component or reflecting element, and wherein this light-emitting component comprises the combination of light emitting diode or the light guide and the light emitting diode of a plurality of arrangements.The minute surface of first light-projecting component 22 can produce the mirror image of object 27, and the application drawing picture (image) that makes sensor 21 produced can comprise the pattern (pattern) of object 27 generations and the pattern that mirror image produced of object 27.Utilize the pattern that mirror image produced of pattern (pattern) that object 27 produces and object 27 can calculate from sensor 21 angle between a side of the extension line of the mirror image through object 27 and object 27 and sensing region respectively; And utilize the size of these angles and sensing region, can calculate the coordinate of object 27.About the coordinate Calculation of this example, in detail can be with reference to No. 201003477 patent application case of TaiWan, China publication number.
Fig. 3 is the synoptic diagram of the optical touch system 3 of demonstration one embodiment of the invention.With reference to shown in Figure 3, optical touch system 3 comprises two sensors 21 and couples the processing unit 25 of two sensors 21.Two sensors were arranged in 21 minutes.Sensor 21 is used to take sensing region.The image that processing unit 25 is extracted according to sensor 21 calculates the position coordinates of object 27 on touching surface 35.Object 27 can comprise pointer (pointer), finger or other similar articles.All sides of sensing region can be provided with many light-projecting components 34, and wherein light-projecting component 34 can be reflecting element or active light-emitting component.
With reference to Fig. 2 and shown in Figure 3, optical touch system 2 and 3 can be designed to when object 27 gets into sensing region, and object 27 produces light-shielding pattern on sensor 21, and perhaps object 27 produces Christmas tree pattern on sensor 21.
Fig. 4 is touch-control system 2 of demonstration one embodiment of the invention or 3 block schematic diagram.With reference to shown in Fig. 2 to 4, sensor 21 detects sensing region.One image processor 41 is coupled to sensor 21, to produce application drawing picture (image).The application drawing that image processor 41 produces looks like to be sent to calculation element 42, and calculation element 42 produces a brightness waveform figure from this application drawing picture.
The spy's, application drawing looks like to comprise a plurality of pixels that matrix form is arranged.In one embodiment, this brightness waveform figure is the added luminance with all pixels of each row of this application drawing picture, the column direction intensity map of being obtained along this application drawing picture.In another embodiment, this brightness waveform figure is the added luminance with all pixels of each row of this application drawing picture, the intensity map of being obtained along this operation image row direction.
In addition, this intensity map also can utilize additive method to calculate.With example, optical touch system 2 or 3 can obtain a background image on the sensing region earlier.Then, after optical touch system 2 or 3 obtained an application drawing picture, calculation element 42 subtracted each other this application drawing picture and this background image, so just can obtain the brightness waveform figure that represents each row or each row monochrome information.
Fig. 5 is a process flow diagram, and it shows the step of image processing method of a kind of optical touch system of one embodiment of the invention.
With reference to Fig. 5 and shown in Figure 8, in step S51, sensor extracts an application drawing picture.
In step S52, the optical touch system produces brightness waveform Fig. 8 who represents this application drawing picture according to this application drawing picture, and is as shown in Figure 8.In one embodiment, this brightness waveform Fig. 8 is the added luminance with all pixels of each row of this application drawing picture or each row, the column or row direction intensity map of being obtained along this application drawing picture.In another embodiment, brightness waveform figure also can be subtracted each other and got by an application drawing picture and a background image.
In step S53,, select an echo signal 81 according to the monochrome information of brightness waveform Fig. 8 of Fig. 8.In the present embodiment, object is to be to form to cover pattern on sensor, thus the optical touch system will to select than the background luminance value be low part, as echo signal 81.In another embodiment, if object is to form Christmas tree pattern on sensor, then will to select than the background luminance value be high part in the optical touch system, as echo signal.
In one embodiment, the selection of echo signal can be judged according to the mask signal/reflected signal of object generation and the difference between background signal.Wherein a kind of method is for obtaining earlier an application drawing picture and a background image respectively.Then, obtain the background image brightness waveform figure (shown in figure 10) of the brightness waveform figure (as shown in Figure 8) that obtains the application drawing picture respectively and background image.Then, brightness waveform figure and background image brightness waveform figure are subtracted each other, can get luminance difference distribution plan shown in figure 13.At last, find out the difference signal 131,132 and 133 that obvious luminance difference is arranged on the luminance difference distribution plan.In the present embodiment, the echo signal 83,81 and the mask signal 82 of difference signal 131,132 and 133 difference corresponding diagram 8.
In step S54, calculate at least one rate of rise and at least one descending slope in this echo signal 81.In the present embodiment; Like Fig. 9 and shown in Figure 10; Echo signal 81 can be distinguished into one first section 812 and one second section 813, and wherein this first section 812 comprises a rising edge (risingedge) 8121, and this second section 813 comprises a decline edge (falling edge) 8122.This at least one rate of rise is represented the steep of this rising edge 8121.Similarly, this at least one descending slope is represented the steep of this drop edge 8122.In the present embodiment, the rising edge 8121 in Fig. 9 and the definition of drop edge 8122 are decided according to the column or row direction of Fig. 8 demonstration, but the present invention is not as limit.These both definition can be different because of the definition of column or row direction.
Have many methods can calculate the rate of rise and descending slope, below enumerate the part method, but the present invention is not as limit.
In one embodiment, in first section 812, select a plurality of points 8111 and 8112 earlier.Then, calculate the straight line 814 through these a plurality of points 8111 and 8112, wherein the slope of this straight line 814 is a rate of rise.Similarly, in second section 813, select a plurality of points 8112 and 8113.In the present embodiment, the point of in first section 812, selecting 8111 has 1: 8112 repetition with 8112 with the point 8113 and 8112 of selection in second section 813.Then, calculate the straight line 815 through a plurality of points 8112 and 8113, wherein the slope of this straight line 815 is a descending slope.
Decision straight line 814 can multiple different selection with the point 8111,8112 and 8113 of straight line 815.Below enumerate several means, the present invention is not as limit.Determine the point 8111 of this straight line 814 to can be the frontier point in this echo signal 81, or near the point of this frontier point.Determine the point 8113 of this straight line 815 to can be another frontier point of this echo signal 81, or near the point of this another frontier point.In the present embodiment, determine jointly the point 8112 of this straight line 814 and this straight line 815 can be this echo signal 81 two frontier points mid point or near the point of this mid point.In one embodiment, determine jointly the point 8112 of this straight line 814 and this straight line 815 can be in this echo signal 81 an extreme point or near the point of this extreme point.When object is to be to form when covering pattern on sensor, and this extreme point is the brightness smallest point; And work as object is to form Christmas tree pattern on sensor, and then this extreme point is the brightness maximum point.
In another embodiment, with reference to shown in Figure 10, in first section 812, select a plurality of points 8114 and 8115 earlier.Then, calculate the straight line 816 through a plurality of points 8114 and 8115, wherein the slope of this straight line 816 is a rate of rise.
A plurality of points 8114 and 8115 can be rising edge 8,121 2 points of taking up an official post.A plurality of points 8114 and 8115 selection are with the extension mode of similar this rising edge 8121 of inclination mode of this straight line 816.A plurality of points 8114 and 8115 suitable to be split up into.With example, put the upper extreme point of 8114 close rising edges 8121, and put the lower extreme point of 8115 close rising edges 8121.In another example, point 8114 can be positioned at the first half scope of rising edge 8121, and put 8115 can be positioned at rising edge 8121 the Lower Half scope.In another example, extend a horizontal expansion section between the lower extreme point of rising edge 8121 and drop edge 8122, point 8115 can be positioned on the horizontal expansion section, can be positioned at rising edge 8121 and put 8114.
In one embodiment, can in first section 812, select to surpass 2 points,, so can obtain a plurality of rates of rise to calculate many straight lines.In another embodiment, the also average slope of these straight lines is to obtain a rate of rise.
Similarly, in second section 813, select a plurality of points 8116 and 8117 earlier.Then, calculate the straight line 817 through a plurality of points 8116 and 8117, wherein the slope of this straight line 817 is a descending slope.
A plurality of points 8116 and 8117 can be drop edge 8,122 2 points of taking up an official post.A plurality of points 8116 and 8117 selection are with the extension mode of similar this drop edge 8122 of inclination mode of this straight line 817.A plurality of points 8116 and 8117 suitable to be split up into.With example, put the upper extreme point of 8116 close drop edges 8122, and put the lower extreme point of 8117 close drop edges 8122.In another example, point 8116 can be positioned at the first half scope of drop edge 8122, and put 8117 can be positioned at drop edge 8122 the Lower Half scope.In another example, extend a horizontal expansion section between the lower extreme point of rising edge 8121 and drop edge 8122, point 8117 can be positioned on the horizontal expansion section, can be positioned on the drop edge 8122 and put 8116.
In one embodiment, can in second section 813, select to surpass 2 points,, so can obtain many rates of rise to calculate many straight lines.In another embodiment, the also average slope of these straight lines is to obtain a rate of rise.
In step S55, respectively at least one rate of rise and an at least one descending slope and a threshold value are compared, to confirm whether in this echo signal 81 be an object signal.If the absolute value of the absolute value of this at least one rate of rise and this at least one descending slope during greater than this threshold value, then can be regarded as the object signal that an object is produced with this echo signal.Afterwards, can be at coordinate according to the corresponding object of the position calculation of this object signal.
Generally speaking, object can produce the pattern that brightness and background luminance have notable difference on the application drawing picture when sensing region.When application drawing looks like to convert to brightness waveform Fig. 8, on brightness waveform Fig. 8, have tangible mask signal of drop or heliogram.Principle when obtaining a brightness waveform Fig. 8, just can therefrom be found out and have the tangible signal of drop on brightness waveform Fig. 8, to determine the object position in view of the above.With reference to shown in Figure 8, in the present embodiment, comprise the less mask signal of a drop 82 on brightness waveform Fig. 8.Likewise, shown in figure 11, can select wantonlyly 2: 8211 and 8212 in the part that comprises rising edge 821, and calculate through this straight line 822 of 2: 8211 and 8212, to obtain a rate of rise.Also can select wantonlyly 2: 8213 and 8214 in the part that comprises drop edge 823, and calculate through this straight line 823 of 2: 8211 and 8212, to obtain a descending slope.Because the signal drop of mask signal 82 is little, so the absolute value of the rate of rise and descending slope is little, so can a threshold value be standard, filters out the little mask signal of this type of signal drop 82, to avoid erroneous judgement.
In one embodiment, if brightness waveform figure has a signal, the absolute value of its rate of rise and descending slope is less than a threshold value, and the new background image of optical touch system desirable at this moment is to replace original background image.
Fig. 6 is a process flow diagram, and it shows the step of image processing method of a kind of optical touch system of another embodiment of the present invention.With reference to Fig. 6, Fig. 8 and shown in Figure 12, in step S61, sensor extracts a background image.
In step S62, according to this background image, produce a background luminance oscillogram 9 of representing this background image, shown in figure 12.
In step S63, sensor extracts an application drawing picture.
In step S64, according to this application drawing picture, produce brightness waveform Fig. 8 who represents this application drawing picture, as shown in Figure 8.
In one embodiment; Brightness waveform Fig. 8 and background luminance oscillogram 9 are respectively with the added luminance of all pixels of each row of this application drawing picture and this background image or each row, the column or row direction intensity map of being obtained along this application drawing picture and this background image.In another embodiment, application drawing picture and background image subtract each other, and also can obtain the brightness waveform figure that represents each row or each row monochrome information.
In step S65, as shown in Figure 8, according to the monochrome information of the brightness waveform figure of Fig. 8, select an echo signal 81.Though in the present embodiment, this echo signal 81 is a mask signal, and the present invention is not as limit.
In step S66, calculate one first monochrome information of echo signal 81.In one embodiment, first monochrome information is the brightness summation of echo signal 81.In another embodiment, first monochrome information (I1) is that the brightness of echo signal 81 is average.
In step S67, calculate on this background luminance oscillogram 9 second monochrome information (I2) of a background signal 81 ' (Figure 12) of corresponding echo signal 81.In one embodiment, monochrome information be background signal 81 ' the brightness summation.In another embodiment, monochrome information be background signal 81 ' brightness average.
In step S68, calculate the ratio (I2/I1) of second monochrome information (I2) and first monochrome information (I1).
In step S69, relatively whether this ratio (I2/I1) and a threshold value are the object signal with decision echo signal 81.Therefore in the present embodiment, object produces occlusion image on sensor, and when ratio (I2/I1) during greater than a threshold value, 81 of echo signals can be considered the object signal by the object generation.
The spy's, with reference to Fig. 8 and shown in Figure 12,, then can calculate ratio less than threshold value if select mask signal 82 and its corresponding background signal 82 ' (Figure 12).Because ratio less than threshold value, does not produce so mask signal 82 can not be regarded as by an object.In one embodiment; In the brightness waveform figure that the application drawing picture is produced, comprise an echo signal; Ratio between the monochrome information of its monochrome information and corresponding background signal is during less than threshold value, and the optical touch system can extract a new background image, with new and old background image.
In one embodiment, if the optical touch system be design on sensor, to produce the object reflected image, then when ratio during less than a threshold value, echo signal can be considered the object signal by the object generation.Relatively, ratio is during greater than a threshold value, and echo signal then possibly be glitch.
Fig. 7 is a process flow diagram, and it shows the step of the image processing method of one embodiment of the invention.With reference to Fig. 8, Figure 12 and shown in Figure 13, in step S71, at first extract a background image.In step S72, produce shown in the background luminance oscillogram (shown in figure 10) of representing this background image.In step S73, extract an application drawing picture.In step S74, produce a brightness waveform figure (as shown in Figure 8) who represents this application drawing picture.
In step S75, on brightness waveform figure, select one first echo signal 81 and one second echo signal 83.First echo signal 81 and one second echo signal 83 are that luminance difference is significantly regional between application drawing picture and background image.In one embodiment, the selection of first echo signal 81 and one second echo signal 83 can be subtracted each other application drawing picture and background image, obtains the luminance difference distribution plan, on the luminance difference distribution plan, selects significantly zone of luminance difference then.
In step S76, calculate one first monochrome information of first echo signal.In step S77, calculate one second monochrome information of second echo signal.
In step S78, calculate on background image the 3rd monochrome information of a background signal of corresponding first echo signal.
In step S79, calculate on background image the 4th monochrome information of a background signal of corresponding second echo signal.
In step S80, if this first monochrome information during less than the 4th monochrome information, simultaneously has mask signal and reflected signal on the expression brightness waveform figure greater than the 3rd monochrome information and this second monochrome information.Usually; Therefore should not have mask signal and reflected signal simultaneously on the brightness waveform figure, when mask signal and reflected signal existed simultaneously, the expression application drawing looked like to have an assorted some interference; May influence object Coordinate Calculation correctness, so need get a new application drawing picture.
In one embodiment, if this first monochrome information during less than the 4th monochrome information, is then upgraded this background image greater than the 3rd monochrome information and this second monochrome information.Under the part situation, having mask signal and reflected signal on the brightness waveform figure simultaneously possibly be that the background luminance distribution changes.At this moment, can background image updating, overcome this abnormal results.
The application's technology contents and technical characterstic disclose as above, yet those skilled in the art still maybe be based on the application's enlightenment and announcements and done all replacement and modifications that does not deviate from this announcement spirit.Therefore, the application's protection domain should be not limited to embodiment and disclose, and should comprise various replacement and the modifications that do not deviate from this announcement, and is contained by claim whether.
Claims (22)
1. the image processing method of an optical touch system comprises the following step:
Extract an application drawing picture, and produce a brightness waveform figure who represents this application drawing picture;
According to the monochrome information of this brightness waveform figure, select the echo signal of this brightness waveform figure;
Calculate at least one rate of rise and at least one descending slope of this echo signal; And
If the absolute value of the absolute value of this rate of rise and this descending slope is all greater than a threshold value, then selecting this echo signal is an object signal.
2. image processing method according to claim 1; Wherein this echo signal comprises one first section and one second section; Wherein this first section comprises a rising edge; And this second section comprises a decline edge, and wherein this rate of rise is the slope of one first straight line of a plurality of points in this first section of representative, and this descending slope is the slope of one second straight line of a plurality of points in this second section of representative.
3. image processing method according to claim 2, wherein one of said a plurality of points in this first section are one first frontier point of this echo signal.
4. image processing method according to claim 3, wherein one of said a plurality of points in this second section are one second frontier point of this echo signal.
5. image processing method according to claim 4, wherein the said a plurality of points in this first section comprise the mid point of this first frontier point and this second frontier point.
6. image processing method according to claim 4, wherein the said a plurality of points in this second section comprise the mid point of this first frontier point and this second frontier point.
7. image processing method according to claim 2, wherein the said a plurality of points in this first section comprise an extreme point of this echo signal.
8. image processing method according to claim 2, wherein the said a plurality of points in this second section comprise an extreme point of this echo signal.
9. image processing method according to claim 1 more comprises the following step:
If this absolute value of this absolute value of this rate of rise or this descending slope, is then got a new background image less than this threshold value.
10. image processing method according to claim 1 more comprises the following step:
With of the brightness addition of this application drawing, and obtain along this brightness waveform figure of this brightness waveform figure of this operation image column direction or line direction distribution as each row or each all pixel of row.
11. image processing method according to claim 1 more comprises the following step:
This brightness waveform figure is subtracted each other by this an application drawing picture and a background image and obtains.
12. the image processing method of an optical touch system comprises the following step:
Extract a background image, and produce a background luminance oscillogram of representing this background image;
Extract an application drawing picture, and produce a brightness waveform figure who represents this application drawing picture;
According to the monochrome information of this brightness waveform figure, select the echo signal of this brightness waveform figure;
Calculate one first monochrome information of this echo signal;
Calculating is on this background luminance oscillogram, to one second monochrome information of a background signal that should echo signal; And
If a ratio of this second monochrome information and this first monochrome information is greater than a threshold value, then selecting this echo signal is an object signal.
13. image processing method according to claim 12, wherein this first monochrome information and this second monochrome information are mean flow rate or brightness summation.
14. image processing method according to claim 12 more comprises the following step:
If this ratio less than this threshold value, then upgrades this background image.
15. image processing method according to claim 12 wherein selects the step of the echo signal of this brightness waveform figure to comprise this brightness waveform figure and this background luminance oscillogram is subtracted each other.
16. image processing method according to claim 12 more comprises the following step:
With of the brightness addition of this application drawing, and obtain along this brightness waveform figure of this operation image column direction or line direction distribution as each row or each all pixel of row.
17. image processing method according to claim 12 more comprises the following step:
This brightness waveform figure is subtracted each other by this application drawing picture and this background image and obtains.
18. the image processing method of an optical touch system comprises the following step:
Extract a background image, and produce a background luminance oscillogram of representing this background image;
Extract an application drawing picture, and produce a brightness waveform figure who represents this application drawing picture;
According to the monochrome information of this brightness waveform figure, select one first echo signal and one second echo signal;
Calculate one first monochrome information of this first echo signal and one second monochrome information of this second echo signal;
Calculating mutually should first echo signal on this background luminance oscillogram the 3rd monochrome information of a background signal;
Calculating mutually should second echo signal on this background luminance oscillogram the 4th monochrome information of a background signal; And
If this first monochrome information, is got a new application drawing picture greater than the 3rd monochrome information and this second monochrome information during less than the 4th monochrome information.
19. image processing method according to claim 18 more comprises the following step:
If this first monochrome information during less than the 4th monochrome information, is then upgraded this background image greater than the 3rd monochrome information and this second monochrome information.
20. image processing method according to claim 18 wherein selects the step of one first echo signal and one second echo signal to comprise this brightness waveform figure and this background luminance oscillogram is subtracted each other.
21. image processing method according to claim 18 more comprises the following step:
With of the brightness addition of this application drawing, and obtain along this brightness waveform figure of this operation image column direction or line direction distribution as each row or each all pixel of row.
22. image processing method according to claim 18 more comprises the following step:
This brightness waveform figure is subtracted each other by this an application drawing picture and a background image and obtains.
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| US20060170658A1 (en) * | 2005-02-03 | 2006-08-03 | Toshiba Matsushita Display Technology Co., Ltd. | Display device including function to input information from screen by light |
| CN101369204A (en) * | 2008-10-09 | 2009-02-18 | 旭丽电子(广州)有限公司 | Method for increasing identification rate of optical touching control panel |
| CN101916150A (en) * | 2010-08-19 | 2010-12-15 | 苏州佳世达电通有限公司 | Object detecting system and object detecting method |
| WO2011028169A1 (en) * | 2009-09-02 | 2011-03-10 | Flatfrog Laboratories Ab | Touch surface with a compensated signal profile |
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2011
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060170658A1 (en) * | 2005-02-03 | 2006-08-03 | Toshiba Matsushita Display Technology Co., Ltd. | Display device including function to input information from screen by light |
| CN101369204A (en) * | 2008-10-09 | 2009-02-18 | 旭丽电子(广州)有限公司 | Method for increasing identification rate of optical touching control panel |
| WO2011028169A1 (en) * | 2009-09-02 | 2011-03-10 | Flatfrog Laboratories Ab | Touch surface with a compensated signal profile |
| CN101916150A (en) * | 2010-08-19 | 2010-12-15 | 苏州佳世达电通有限公司 | Object detecting system and object detecting method |
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