CN102750043B - Image processing method of optical touch system - Google Patents
Image processing method of optical touch system Download PDFInfo
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- CN102750043B CN102750043B CN201110099966.1A CN201110099966A CN102750043B CN 102750043 B CN102750043 B CN 102750043B CN 201110099966 A CN201110099966 A CN 201110099966A CN 102750043 B CN102750043 B CN 102750043B
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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, particularly a kind of image processing method of optical touch control system.
Background technology
Touch-controlled screen device is a kind of electronic installation conveniently allowing user directly carry out input operation on screen.After pointer (stylus), finger tip or other fellows touch screen, touch-controlled screen device can detect and calculate the position producing and touch, and exports coordinate to computer system, carries out follow-up computing to allow computer system.
Optical touch screen is one common in the touch-controlled screen device 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 isoelectric membrane optical touch screen, produce occlusion image at camera head.When without object contact optical Touch Screen, the image that camera head extracts can produce a background luminance waveform 11, as shown in Figure 1; And when isoelectric membrane optical touch screen, the image that camera head extracts then can produce the brightness waveform 12 comprising mask signal 121.
When isoelectric membrane optical touch screen, the mode of light reflection may be changed, thus produce glitch.Such as, object may cause the distortion of Touch Screen, thus light is reflexed to camera head, thus produces a heliogram 13, or changes the reflection of former light, and produce a false mask signal (false lightshielding signal) 14.False mask signal 14 may be produced by object by misjudged one-tenth, and calculates the object coordinate of mistake, 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 known optical Touch Screen easily produces glitch.
Summary of the invention
In order to solve the problems referred to above that prior art exists, one embodiment of the invention provides a kind of image processing method of optical touch control system, comprises the following step: extract an application drawing picture, and produces the brightness waveform figure representing this application drawing picture; According to the monochrome information of this brightness waveform figure, select an echo signal of this brightness waveform figure; Calculate at least one rate of rise of this echo signal and at least one descending slope; 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 select this echo signal to be an object signal.
Another embodiment of the present invention discloses a kind of image processing method of optical touch control system, comprises the following step: extract a background image, and produces the background luminance oscillogram representing this background image; Extract an application drawing picture, and produce the brightness waveform figure representing this application drawing picture; According to the monochrome information of this brightness waveform figure, select an echo signal of this brightness waveform figure; Calculate one first monochrome information of this echo signal; Calculate in this background luminance oscillogram, to should one second monochrome information of a background signal of echo signal; And if a ratio of this second monochrome information and this first monochrome information is greater than a threshold value, then this echo signal is selected to be an object signal.
Yet another embodiment of the invention discloses a kind of image processing method of optical touch control system, comprises the following step: extract a background image, and produces the background luminance oscillogram representing this background image; Extract an application drawing picture, and produce the brightness waveform figure representing this application drawing picture; According to the monochrome information of this brightness waveform figure, select a first object signal and one second echo signal; Calculate one first monochrome information of this first object signal and one second monochrome information of this second echo signal; Calculate in this background luminance oscillogram, mutually should the 3rd monochrome information of a background signal of first object signal; Calculate in this background luminance oscillogram, mutually should the 4th monochrome information of a background signal of the second echo signal; And if this first monochrome information is greater than the 3rd monochrome information, with when this second monochrome information is less than the 4th monochrome information, get a new application drawing picture.
The present invention can improve the degree of accuracy of optical touch screen.
The technical characteristic of sketch out the application and advantage above, describes in detail to make the application hereafter and is obtained better understanding.Other technical characteristic and the advantage that form the claim target of the application will be described in hereafter.In the application's art, those of ordinary skill should be understood, and the concept hereafter disclosed and specific embodiment can be used as basis and revised or design other structure or technique quite easily and realize the object identical with the application.In the application's art, those of ordinary skill also should be understood, and the construction of this kind of equivalence also cannot depart from the spirit and scope of the application that appended claim proposes.
Accompanying drawing explanation
Fig. 1 is a line chart, its brightness waveform showing a background luminance waveform and obtain in an application drawing picture;
Fig. 2 is the schematic diagram of the optical touch control system of display one embodiment of the invention;
Fig. 3 is the schematic diagram of the optical touch control system of display another embodiment of the present invention;
Fig. 4 is the block schematic diagram of the touch-control system of display one embodiment of the invention;
Fig. 5 is a process flow diagram, the step of the image processing method of a kind of optical touch control system of its display one embodiment of the invention;
Fig. 6 is a process flow diagram, the step of the image processing method of a kind of optical touch control system of its display another embodiment of the present invention;
Fig. 7 is a process flow diagram, the step of the image processing method of its display one embodiment of the invention;
Fig. 8 is a brightness waveform figure of display one embodiment of the invention;
Fig. 9 is the schematic diagram of the echo signal of display one embodiment of the invention;
Figure 10 is the schematic diagram of the echo signal of display one embodiment of the invention;
Figure 11 is the schematic diagram of the mask signal of display one embodiment of the invention;
Figure 12 is the background luminance oscillogram of display one embodiment of the invention; And
Figure 13 is the display application drawing picture of one embodiment of the invention and the luminance difference distribution plan of background image.
Description of reference numerals in above-mentioned accompanying drawing is as follows:
2 optical touch control systems
3 optical touch control 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 schematic diagram of the optical touch control system 2 of display one embodiment of the invention.With reference to shown in Fig. 2, optical touch control system 2 comprises sensor 21,1 first light-projecting component (light providingmember) 22,1 second light-projecting component 23, 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 touch surface (touchsurface) 26 around a sensing region one.Sensor 21 arranges the activity of touching (touch activity) detected in sensing region.Processing unit 25 couples sensor 21, and according to the image that sensor 21 produces, analyzes the coordinate at object 27 place.
In one embodiment, the 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 light emitting diode of multiple arrangement or the combination of light guide and light emitting diode.The minute surface of the first light-projecting component 22 can produce the mirror image of object 27, and the application drawing picture (image) that sensor 21 is produced can comprise pattern (pattern) that object 27 produces and the pattern that the mirror image of object 27 produces.The pattern that the pattern (pattern) utilizing object 27 to produce and the mirror image of object 27 produce can calculate from sensor 21 respectively by the angle between the extension line of mirror image of object 27 and object 27 and a side of sensing region, and utilize the size of these angles and sensing region, the coordinate of object 27 can be calculated.Coordinate about this example calculates, in detail can with reference to TaiWan, China publication number No. 201003477 patent application case.
Fig. 3 is the schematic diagram of the optical touch control system 3 of display one embodiment of the invention.With reference to shown in Fig. 3, optical touch control system 3 comprises two sensors 21 and couples the processing unit 25 of two sensors 21.Two sensors 21 are provided separately.Sensor 21 is for taking sensing region.The image that processing unit 25 extracts 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 arrange many light-projecting components 34, and wherein light-projecting component 34 can be reflecting element or active light emitting elements.
With reference to shown in Fig. 2 and Fig. 3, optical touch control system 2 and 3 can be designed to when object 27 enters sensing region, and object 27 produces light-shielding pattern on sensor 21, or object 27 produces Christmas tree pattern on sensor 21.
Fig. 4 is the block schematic diagram of the touch-control system 2 or 3 of display one embodiment of the invention.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 picture that image processor 41 produces is sent to calculation element 42, and calculation element 42, from this application drawing picture, produces a brightness waveform figure.
Spy's, application drawing picture comprises multiple pixels of matrix arrangement.In one embodiment, this brightness waveform figure is by the added luminance of all pixels of every a line of this application drawing picture, the acquired column direction intensity map along this application drawing picture.In another embodiment, this brightness waveform figure is by the added luminance of all pixels of each row of this application drawing picture, the acquired intensity map along this operation image row direction.
In addition, this intensity map also can utilize additive method to calculate.With example, optical touch control system 2 or 3 first can obtain the background image on a sensing region.Then, after optical touch control system 2 or 3 obtains an application drawing picture, calculation element 42, by this application drawing picture and this background image subtraction, so just can obtain the brightness waveform figure representing each row or every a line monochrome information.
Fig. 5 is a process flow diagram, the step of the image processing method of a kind of optical touch control system of its display one embodiment of the invention.
With reference to shown in Fig. 5 and Fig. 8, in step s 51, sensor extracts an application drawing picture.
In step S52, optical touch control system, according to this application drawing picture, produces the brightness waveform Fig. 8 representing this application drawing picture, as shown in Figure 8.In one embodiment, this brightness waveform Fig. 8 is the added luminance of all pixels by every a line of this application drawing picture or each row, the acquired column or row direction intensity map along this application drawing picture.In another embodiment, brightness waveform figure also can be obtained by an application drawing picture and a background image subtraction.
In step S53, according to the monochrome information of brightness waveform Fig. 8 of Fig. 8, select an echo signal 81.In the present embodiment, object is formed to cover pattern on sensor, and therefore optical touch control system is low part by selecting compared with background value, as echo signal 81.In another embodiment, if object is form Christmas tree pattern on sensor, then optical touch control system will be selected compared with background value is high part, as echo signal.
In one embodiment, the difference of mask signal/between reflected signal and background signal that the selection of echo signal can produce according to object judges.Wherein a kind of method is for first to obtain an application drawing picture and a background image respectively.Then, the background image brightness waveform figure (as shown in Figure 10) of brightness waveform figure (as shown in Figure 8) and the background image obtaining application drawing picture is respectively obtained.Then, brightness waveform figure and background image brightness waveform figure is subtracted each other, luminance difference distribution plan as shown in fig. 13 that can be obtained.Finally, the difference signal 131,132 and 133 luminance difference distribution plan having obvious luminance difference is found out.In the present embodiment, difference signal 131,132 and 133 distinguishes echo signal 83,81 and the mask signal 82 of corresponding diagram 8.
In step S54, calculate at least one rate of rise of this echo signal 81 and at least one descending slope.In the present embodiment, as shown in Figure 9 and Figure 10, echo signal 81 can be distinguished into one first section 812 and one second section 813, wherein this first section 812 comprises a rising edge (risingedge) 8121, and this second section 813 comprises a drop edge (falling edge) 8122.This at least one rate of rise represents the steep of this rising edge 8121.Similarly, this at least one descending slope represents the steep of this drop edge 8122.In the present embodiment, the column or row direction that the rising edge 8121 in Fig. 9 and the definition of drop edge 8122 show according to Fig. 8 and determining, but the present invention is not as limit.Being somebody's turn to do both definition can be different because the definition of column or row direction is different.
Have many methods can calculate the rate of rise and descending slope, below enumerate Part Methods, but the present invention is not as limit.
In one embodiment, in the first section 812, first select multiple point 8111 and 8112.Then, calculate the straight line 814 by the plurality of point 8111 and 8112, wherein the slope of this straight line 814 is a rate of rise.Similarly, in the second section 813, select multiple point 8112 and 8113.In the present embodiment, the point 8111 and 8112 selected in the first section 812 and the point 8113 and 8112 selected in the second section 813 have 1: 8112 to repeat.Then, calculate the straight line 815 by multiple point 8112 and 8113, wherein the slope of this straight line 815 is a descending slope.
Determine that straight line 814 can multiple different selection from the point 8111,8112 and 8113 of straight line 815.Below enumerate several means, the present invention is not as limit.Determine that the point 8111 of this straight line 814 can be the frontier point in this echo signal 81, or the point of this frontier point close.Determine that the point 8113 of this straight line 815 can be another frontier point of this echo signal 81, or the point of this another frontier point close.In the present embodiment, this straight line 814 of common decision can be the mid point of two frontier points of this echo signal 81 or the point close to this mid point with the point 8112 of this straight line 815.In one embodiment, this straight line 814 of common decision can be the extreme point in this echo signal 81 or the point close to this extreme point with the point 8112 of this straight line 815.When object be on sensor be formed cover pattern time, this extreme point is brightness smallest point; And when object is form Christmas tree pattern on sensor, then this extreme point is brightness maximum point.
In another embodiment, with reference to shown in Figure 10, in the first section 812, multiple point 8114 and 8115 is first selected.Then, calculate the straight line 816 by multiple point 8114 and 8115, wherein the slope of this straight line 816 is a rate of rise.
Multiple point 8114 and 8115 can be rising edge 8121 and to take up an official post 2 points.The selection of multiple point 8114 and 8115 is in the extension mode of the angled manner of this straight line 816 this rising edge 8121 similar.Multiple point 8114 and 8115 is suitable to be split up into.With example, point 8114 can near the upper extreme point of rising edge 8121, and put 8115 can near the lower extreme point of rising edge 8121.In another example, point 8114 can be positioned at the first half scope of rising edge 8121, and puts the Lower Half scope that 8115 can be positioned at rising edge 8121.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 in horizontal expansion section, and puts 8114 and can be positioned at rising edge 8121.
In one embodiment, can select more than 2 points in the first section 812, to calculate many straight lines, so can obtain multiple rate of rise.In another embodiment, also can the slope of average these straight lines, to obtain a rate of rise.
Similarly, in the second section 813, first select multiple point 8116 and 8117.Then, calculate the straight line 817 by multiple point 8116 and 8117, wherein the slope of this straight line 817 is a descending slope.
Multiple point 8116 and 8117 can be drop edge 8122 and to take up an official post 2 points.The selection of multiple point 8116 and 8117 is in the extension mode of the angled manner of this straight line 817 this drop edge 8122 similar.Multiple point 8116 and 8117 is suitable to be split up into.With example, point 8116 can near the upper extreme point of drop edge 8122, and put 8117 can near the lower extreme point of drop edge 8122.In another example, point 8116 can be positioned at the first half scope of drop edge 8122, and puts the Lower Half scope that 8117 can be positioned at drop edge 8122.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 in horizontal expansion section, and puts 8116 and can be positioned on drop edge 8122.
In one embodiment, can select more than 2 points in the second section 813, to calculate many straight lines, so can obtain many rates of rise.In another embodiment, also can the slope of average these straight lines, to obtain a rate of rise.
Whether, in step S55, at least one rate of rise compared with a threshold value with at least one descending slope respectively, be an object signal to determine in this echo signal 81.If when the absolute value of the absolute value of this at least one rate of rise and this at least one descending slope is greater than this threshold value, then this echo signal can be considered as the object signal that an object produces.Afterwards, can at the coordinate according to the corresponding object of the position calculation of this object signal.
Generally speaking, object, when sensing region, can produce the pattern that brightness and background luminance have notable difference on application drawing picture.When application drawing picture converts brightness waveform Fig. 8 to, brightness waveform Fig. 8 has the obvious mask signal of drop or heliogram.Principle accordingly, as acquisition one brightness waveform Fig. 8, just therefrom can find out on brightness waveform Fig. 8 and have the obvious signal of drop, to determine article position.With reference to shown in Fig. 8, in the present embodiment, brightness waveform Fig. 8 comprises the less mask signal of a drop 82.Similarly, as shown in figure 11, wantonly 2: 8211 and 8212 can be selected in the part comprising rising edge 821, and calculate by this 2: 8211 and 8212 straight line 822, to obtain a rate of rise.Also can select wantonly 2: 8213 and 8214 in the part comprising drop edge 823, and calculate by this 2: 8211 and 8212 straight line 823, to obtain a descending slope.Because the signal drop of mask signal 82 is little, therefore the absolute value of the rate of rise and descending slope is little, therefore 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, now the desirable new background image of optical touch control system, to replace original background image.
Fig. 6 is a process flow diagram, the step of the image processing method of a kind of optical touch control system of its display another embodiment of the present invention.With reference to shown in Fig. 6, Fig. 8 and Figure 12, in step S61, sensor extracts a background image.
In step S62, according to this background image, produce the background luminance oscillogram 9 representing this background image, as shown in figure 12.
In step S63, sensor extracts an application drawing picture.
In step S64, according to this application drawing picture, produce the brightness waveform Fig. 8 representing this application drawing picture, as shown in Figure 8.
In one embodiment, brightness waveform Fig. 8 and background luminance oscillogram 9 are respectively by the added luminance of all pixels of every a line of this application drawing picture and this background image or each row, the acquired column or row direction intensity map along this application drawing picture and this background image.In another embodiment, application drawing picture and background image subtraction, also can obtain the brightness waveform figure representing each row or every a line 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, the first monochrome information is the brightness summation of echo signal 81.In another embodiment, the first monochrome information (I1) for the brightness of echo signal 81 average.
In step S67, calculate in 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 is the brightness summation of background signal 81 '.In another embodiment, monochrome information is that the brightness of background signal 81 ' is average.
In step S68, calculate the ratio (I2/I1) of the second monochrome information (I2) and the first monochrome information (I1).
In step S69, compare this ratio (I2/I1) and a threshold value, to determine whether echo signal 81 is object signal.In the present embodiment, object produces occlusion image on sensor, and therefore when ratio (I2/I1) is greater than a threshold value, echo signal 81 can be considered the object signal produced by object.
Spy's, with reference to shown in Fig. 8 and Figure 12, if select the background signal 82 ' (Figure 12) of mask signal 82 and its correspondence, then the ratio being less than threshold value can be calculated.Because ratio is less than threshold value, so mask signal 82 can not be regarded as being produced by an object.In one embodiment, when comprising an echo signal in the brightness waveform figure that application drawing picture produces, when ratio between the monochrome information of its monochrome information and corresponding background signal is less than threshold value, optical touch control system can extract a new background image, with new and old background image.
In one embodiment, if optical touch control system designs to produce object reflected image on sensor, then, when ratio is less than a threshold value, echo signal can be considered the object signal produced by object.Relatively, when ratio is greater than a threshold value, echo signal may be then glitch.
Fig. 7 is a process flow diagram, the step of the image processing method of its display one embodiment of the invention.With reference to shown in Fig. 8, Figure 12 and Figure 13, in step S71, first extract a background image.In step S72, generation represents shown in a background luminance oscillogram (as shown in Figure 10) of this background image.In step S73, extract an application drawing picture.In step S74, produce the brightness waveform figure (as shown in Figure 8) representing this application drawing picture.
In step S75, on brightness waveform figure, select first object signal 81 and one second echo signal 83.First object signal 81 and one second echo signal 83 are the obvious region of luminance difference between application drawing picture and background image.In one embodiment, the selection of first object signal 81 and one second echo signal 83 by application drawing picture and background image subtraction, can obtain luminance difference distribution plan, then on luminance difference distribution plan, selects the obvious region of luminance difference.
In step S76, calculate one first monochrome information of first object signal.In step S77, calculate one second monochrome information of the second echo signal.
In step S78, calculate on background image, the 3rd monochrome information of a background signal of corresponding first object 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 is greater than the 3rd monochrome information, with when this second monochrome information is less than the 4th monochrome information, represents and brightness waveform figure has mask signal and reflected signal simultaneously.Usually, brightness waveform figure should not have mask signal and reflected signal simultaneously, therefore when mask signal and reflected signal exist simultaneously, represent that application drawing picture has the interference of assorted point, the accuracy in computations of object coordinate may be affected, therefore a new application drawing picture need be got.
In one embodiment, if this first monochrome information is greater than the 3rd monochrome information, and when this second monochrome information is less than the 4th monochrome information, then this background image is upgraded.In some circumstances, brightness waveform figure having simultaneously mask signal and reflected signal may be that background luminance distributes and changes.Now, can background image be upgraded, overcome this abnormal results.
Technology contents and the technical characterstic of the application disclose as above, but those skilled in the art still may do all replacement and the modification that do not deviate from this announcement spirit based on the enlightenment of the application and announcement.Therefore, the protection domain of the application should be not limited to embodiment and disclosed, and should comprise the various replacement and the modification that do not deviate from this announcement, and is contained by claim whether.
Claims (22)
1. an image processing method for optical touch control system, comprises the following step:
Extract an application drawing picture, and produce the brightness waveform figure representing this application drawing picture;
According to the monochrome information of this brightness waveform figure, select an echo signal of this brightness waveform figure;
Calculate at least one rate of rise of this echo signal and at least one descending slope; 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 this echo signal is selected to be 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 drop edge, wherein this rate of rise is the slope of one first straight line of multiple point in this first section of representative, and this descending slope is the slope of one second straight line of multiple point in this second section of representative.
3. image processing method according to claim 2, one of described multiple points wherein in this first section are one first frontier point of this echo signal.
4. image processing method according to claim 3, one of described multiple points wherein in this second section are a second boundary point of this echo signal.
5. image processing method according to claim 4, the described multiple points wherein in this first section comprise the mid point of this first frontier point and this second boundary point.
6. image processing method according to claim 4, the described multiple points wherein in this second section comprise the mid point of this first frontier point and this second boundary point.
7. image processing method according to claim 2, the described multiple points wherein in this first section comprise an extreme point of this echo signal.
8. image processing method according to claim 2, the described multiple points wherein 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 less than this threshold value, then get a new background image.
10. image processing method according to claim 1, more comprises the following step:
The brightness every a line of this application drawing picture or each being arranged all pixels is added, and obtains this brightness waveform figure of this brightness waveform figure distributed along this operation image column direction or line direction.
11. image processing methods according to claim 1, more comprise the following step:
This brightness waveform figure is obtained by this application drawing picture and a background image subtraction.
The image processing method of 12. 1 kinds of optical touch control systems, comprises the following step:
Extract a background image, and produce the background luminance oscillogram representing this background image;
Extract an application drawing picture, and produce the brightness waveform figure representing this application drawing picture;
According to the monochrome information of this brightness waveform figure, select an echo signal of this brightness waveform figure;
Calculate one first monochrome information of this echo signal;
Calculate in this background luminance oscillogram, to should one second monochrome information of a background signal of echo signal; And
If a ratio of this second monochrome information and this first monochrome information is greater than a threshold value, then this echo signal is selected to be an object signal.
13. image processing methods according to claim 12, wherein this first monochrome information and this second monochrome information are mean flow rate or brightness summation.
14. image processing methods according to claim 12, more comprise the following step:
If this ratio is less than this threshold value, then upgrade this background image.
15. image processing methods according to claim 12, wherein select the step of an 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 methods according to claim 12, more comprise the following step:
The brightness every a line of this application drawing picture or each being arranged all pixels is added, and obtains this brightness waveform figure along this operation image column direction or line direction distribution.
17. image processing methods according to claim 12, more comprise the following step:
This brightness waveform figure is obtained by this application drawing picture and this background image subtraction.
The image processing method of 18. 1 kinds of optical touch control systems, comprises the following step:
Extract a background image, and produce the background luminance oscillogram representing this background image;
Extract an application drawing picture, and produce the brightness waveform figure representing this application drawing picture;
According to the monochrome information of this brightness waveform figure, select a first object signal and one second echo signal;
Calculate one first monochrome information of this first object signal and one second monochrome information of this second echo signal;
Calculating in this background luminance oscillogram mutually should the 3rd monochrome information of a background signal of first object signal;
Calculating in this background luminance oscillogram mutually should the 4th monochrome information of a background signal of the second echo signal; And
If this first monochrome information is greater than the 3rd monochrome information, with when this second monochrome information is less than the 4th monochrome information, get a new application drawing picture.
19. image processing methods according to claim 18, more comprise the following step:
If this first monochrome information is greater than the 3rd monochrome information, and when this second monochrome information is less than the 4th monochrome information, then upgrade this background image.
20. image processing methods according to claim 18, wherein select the step of a first object signal and one second echo signal to comprise this brightness waveform figure and this background luminance oscillogram is subtracted each other.
21. image processing methods according to claim 18, more comprise the following step:
The brightness every a line of this application drawing picture or each being arranged all pixels is added, and obtains this brightness waveform figure along this operation image column direction or line direction distribution.
22. image processing methods according to claim 18, more comprise the following step:
This brightness waveform figure is obtained by this application drawing picture and a background image subtraction.
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|---|---|---|---|---|
| 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 |
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| US7800594B2 (en) * | 2005-02-03 | 2010-09-21 | Toshiba Matsushita Display Technology Co., Ltd. | Display device including function to input information from screen by light |
| CN102597936B (en) * | 2009-09-02 | 2015-01-07 | 平蛙实验室股份公司 | Touch surface with a compensated signal profile |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
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