CN102999233A - Automatic interference point shielding method and device for electronic whiteboard based on image sensor - Google Patents
Automatic interference point shielding method and device for electronic whiteboard based on image sensor Download PDFInfo
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- CN102999233A CN102999233A CN2012105077848A CN201210507784A CN102999233A CN 102999233 A CN102999233 A CN 102999233A CN 2012105077848 A CN2012105077848 A CN 2012105077848A CN 201210507784 A CN201210507784 A CN 201210507784A CN 102999233 A CN102999233 A CN 102999233A
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Abstract
The invention provides an automatic interference point shielding method and an automatic interference point shielding device for an electronic whiteboard based on an image sensor. The method comprises the following steps of: a, driving display equipment to display a detection background on a display plane in a whole screen, wherein the brightness of the detection background is lower than that of the control light spots; b, driving the image sensor to photograph the detection background displayed on the display plane; and c, analyzing an image area in the picture photographed by the image sensor, and adding an interference area of which the brightness is higher than a preset brightness threshold into a shielding area. According to the method and the device, the interference points in the image area can be automatically shielded.
Description
Technical field
The present invention relates to the electronic whiteboard technology based on imageing sensor, relate in particular to a kind of noise spot automatic shield method and device of the electronic whiteboard based on imageing sensor.
Background technology
Electronic whiteboard based on imageing sensor is a kind of new touch technology, and this technology has been transformed into traditional display device has the alternately display device that is similar to touch function.
Fig. 1 shows a kind of electronic whiteboard based on imageing sensor of the prior art, comprise: projector 101, imageing sensor 102, projection plane 103, main frame 104, wherein projector 101 is projected in the display frame that main frame 104 sends on the projection plane 103,102 pairs of projection planes 103 of imageing sensor are taken, display frame on the projection plane 103 and the shooting picture that is incident upon the light pen luminous point in the projection unilateral 103 are transferred to main frame 104, the luminous point that main frame 104 extracts in the shooting picture, and the correspondingly display frame of regulating and controlling projector 101, feedback is made in action to luminous point, realizes the function of similar touch-screen.
About the further information based on the electronic whiteboard of imageing sensor, the publication No. that can announce with reference on March 14th, 2012 be the Chinese patent application document of CN102375622A.
Still with reference to figure 1, the position of luminous point in the locating module real-time analysis imageing sensor 102 in the main frame 104, and this position is mapped to the mouse position of projector 101 display frames, the light on and off by the light pen luminous point realize replacing computer mouse to control the function of main frame 104.But in the picture 105 that imageing sensor 102 photographs, 106 of the imagery zones of projector 101 projections occupy a wherein part, and also having in addition a lot of zones is environmental backgrounds.Therefore, main frame 104 usually can be with other regions shield beyond the imagery zone 106, and only detection and response imagery zone 106 scopes are with interior luminous point.
Generally speaking, whether electronic whiteboard judges greater than a certain thresholding T whether light pen or user's finger is being write by the size of judging speck.But, in environment, may exist brightness greater than the jamming light source of thresholding T, thereby only keep imagery zone even shield environmental background with the shielding picture, jamming light source still may be present in the imagery zone, causes electronic whiteboard can't correctly identify real light pen hot spot and can't normally write.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of noise spot automatic shield method and device of the electronic whiteboard based on imageing sensor, the noise spot in can the automatic shield imagery zone.
For solving the problems of the technologies described above, the invention provides a kind of noise spot automatic shield method of the electronic whiteboard based on imageing sensor, described electronic whiteboard is configured to be used with display device, and described display device is used for presenting the demonstration image at display plane, and described electronic whiteboard comprises:
Be used for taking the imageing sensor of described display plane, the picture that described imageing sensor photographs comprises imagery zone and the shielding area except described imagery zone;
With the control assembly that described display device links to each other with imageing sensor, be used for locating the control hot spot in the described imagery zone;
Described noise spot automatic shield method comprises:
Step a drives described display device full screen display detection background on described display plane, and the brightness of described detection background is lower than the brightness of described control hot spot;
Step b drives described imageing sensor the detection background that shows on the described display plane is taken;
Step c analyzes the imagery zone in the described imageing sensor shooting picture, and brightness is added into described shielding area greater than the interference region of presetting luminance threshold.
According to one embodiment of present invention, described step a also comprises: the gamma value of described imageing sensor is turned down, made it be lower than conventional value.
According to one embodiment of present invention, described method also comprises: repeating said steps b and step c many times.
According to one embodiment of present invention, described method also comprises: steps d, gamma value at described imageing sensor is in the situation of conventional value, the continuous multiple frames picture that the described imageing sensor of detecting real-time is taken, if exist area to continue to surpass Preset Time at same position less than the speck of preset area thresholding in the described imagery zone, then will be added into described shielding area with this speck same position, zone of the same area.
According to one embodiment of present invention, in described step c or steps d, if exist area greater than the speck of described preset area thresholding in the described imagery zone, then there be strong the interference in prompting user.
The present invention also provides a kind of noise spot automatic shield device of the electronic whiteboard based on imageing sensor, and described electronic whiteboard is configured to be used with display device, and described display device is used for presenting the demonstration image at display plane, and described electronic whiteboard comprises:
Be used for taking the imageing sensor of described display plane, the picture that described imageing sensor photographs comprises imagery zone and the shielding area except described imagery zone;
With the control assembly that described display device links to each other with imageing sensor, be used for locating the control hot spot in the described imagery zone;
Described noise spot automatic shield device comprises:
The first driver module drives described display device full screen display detection background on described display plane, and the brightness of described detection background is lower than the brightness of described control hot spot;
The second driver module drives described imageing sensor the detection background that shows on the described display plane is taken;
Analyze shroud module, the imagery zone in the described imageing sensor shooting picture is analyzed, brightness is added into described shielding area greater than the interference region of presetting luminance threshold.
According to one embodiment of present invention, described the first driver module is also turned the gamma value of described imageing sensor down, makes it be lower than conventional value.
According to one embodiment of present invention, described the first driver module drives described display device after full screen display detection background on the described display plane, described the second driver module drives described imageing sensor and takes repeatedly, and described analysis shroud module is processed respectively the picture of each shooting gained.
According to one embodiment of present invention, described device also comprises: dynamic shroud module, gamma value at described imageing sensor is in the situation of conventional value, the continuous multiple frames picture that the described imageing sensor of detecting real-time is taken, if exist area to continue to surpass Preset Time at same position less than the speck of preset area thresholding in the described imagery zone, then will be added into described shielding area with this speck same position, zone of the same area.
According to one embodiment of present invention, described device also comprises: reminding module, link to each other with dynamic shroud module with described analysis shroud module, if exist area greater than the speck of described preset area thresholding in the described imagery zone, then there be strong the interference in prompting user.
Compared with prior art, the present invention has the following advantages:
The noise spot automatic shield method of the embodiment of the invention comprises static shielding process, drive the highlighted detection background of display device full screen display, and preferably the gamma value of imageing sensor is turned down, so that potential jamming target all comes out, the interference region that afterwards brightness is higher than default thresholding adds in the shielding area, thereby has realized the automatic shield in static interference zone.The process of static shielding can be moved when electronic whiteboard starts, the instruction triggers of perhaps being sent by the user and moving.
Further, the noise spot automatic shield method of the embodiment of the invention also comprises dynamic shielding process, gamma value at imageing sensor is under the conventional state of value, the continuous multiple frames picture that the detecting real-time imageing sensor photographs, if in imagery zone, exist area less than the speck of preset area thresholding, and this speck continues to surpass Preset Time at same position, then will be added into shielding area with this speck same position, zone of the same area, thereby with the noise spot shielding that dynamically occurs in the electronic whiteboard process.
Description of drawings
Fig. 1 is the structural representation of a kind of electronic whiteboard based on imageing sensor in the prior art;
Fig. 2 is the schematic flow sheet based on the noise spot automatic shield method of the electronic whiteboard of imageing sensor of the embodiment of the invention;
Fig. 3 shows the schematic flow sheet of static shielding process in the noise spot automatic shield method of the embodiment of the invention;
Fig. 4 shows in the noise spot automatic shield method of the embodiment of the invention the dynamically schematic flow sheet of shielding process;
Fig. 5 to Fig. 8 shows the picture view that imageing sensor photographs in each step in the noise spot automatic shield method of the embodiment of the invention;
Fig. 9 is the structured flowchart of the noise spot automatic shield device of the embodiment of the invention.
Embodiment
The invention will be further described below in conjunction with specific embodiments and the drawings, but should not limit protection scope of the present invention with this.
In the present embodiment, electronic whiteboard based on imageing sensor can be configured to be used with display device usually, this display device presents the demonstration image at display plane, this electronic whiteboard can comprise: be used for taking the imageing sensor of described display plane, the picture that this imageing sensor photographs comprises the shielding area beyond imagery zone and the imagery zone; With the control assembly that display device links to each other with imageing sensor, only locate the control hot spot in the imagery zone, and the operation in the shielding area beyond the imagery zone is not responded.
Wherein, display device can be various liquid crystal (LCD) screen, light emitting diode (LED) screen, plasma display or projector etc.Imageing sensor can adopt the camera of various routines to realize, can be various types of imageing sensors such as CCD, CMOS specifically, and its resolution for example can be 640*480, but is not limited to this.Control assembly can be the controller of personal computer (computer), special use or adopt the realizations such as programmable hardware or special IC.In addition, this electronic whiteboard can also comprise infrared light pen, light film or for generation of the equipment such as parts of light film.
For example, this electronic whiteboard can be the electronic whiteboard described in the background technology, or the electronic whiteboard in the patent documentation of quoting in the background technology.
As a nonrestrictive example, imagery zone can come to determine in the following way: drive display device full screen display first color on display plane, drive the picture that optical sensor is taken display plane, and it is saved as the first picture; Drive display device full screen display second color on display plane, drive the picture that optical sensor is taken display plane, and it is saved as second picture, the second color has different brightness from the first color; The first picture and second picture are converted to the gray scale picture, generate respectively the first picture and the second gray scale picture; The first gray scale picture and the second gray scale picture are carried out calculus of differences, obtain the difference picture; Pixel value in the difference picture is set as object pixel more than or equal to the pixel of presetting thresholding, and the zone that has continuous object pixel to exist is defined as the target area; Area is eliminated less than the target area of preset area; In remaining target area, select one of the Retention area maximum and be defined as imagery zone; Fill up the cavity of imagery zone inside.In the picture that imageing sensor is taken, it is shielding area that other zones beyond the imagery zone then can be defined as.
With reference to figure 2, present embodiment may further comprise the steps based on the noise spot automatic shield method of the electronic whiteboard of imageing sensor:
Step a drives described display device full screen display detection background on described display plane, and the brightness of described detection background is lower than the brightness of described control hot spot;
Step b drives described imageing sensor the detection background that shows on the described display plane is taken;
Step c analyzes the imagery zone in the described imageing sensor shooting picture, and brightness is added into described shielding area greater than the interference region of presetting luminance threshold.
In step a, can also simultaneously the gamma value of imageing sensor be turned down, so that potential noise spot can come out easilier.Need to prove that " turning down " is relative concept herein, is not to refer in particular to a certain definite scope, specifically refers to the gamma value of regulating imageing sensor, the routine value of imageing sensor gamma value when it is worked less than electronic whiteboard.
In step c, default luminance threshold can be the brightness upper limit of control hot spot usually, when namely normally using, and the high-high brightness of the high-high brightness of the hot spot of light pen or finger flare.
What above step a to c was corresponding is static shielding process, be static some interference sources that exist in the screening electron blank working environment, forbid that in static state shielding process the user uses light pen to operate, namely suppose not occur controlling normally hot spot in the imagery zone.
This static state shielding process can be carried out when electronic whiteboard starts initialization, also can be to be undertaken by user's instruction triggers after startup.Because in the application scenarios of reality, disturb hot spot to glimmer not stopping, thereby the brightness of interference region and size are constantly to change, therefore in static shielding process once, interference region might be in the state that brightness is the darkest, area is minimum just, cause the shielding area that adds less than actual interference region size, can not shield for a full due noise spot.Given this plant situation, in a preferred embodiment, in static shielding process once, can repeating step b and c many times, to guarantee fully, fully noise spot to be shielded.
After electronic whiteboard is started working, can also dynamically shield.Specifically comprise steps d, gamma value at imageing sensor is in the situation of conventional value, the continuous multiple frames picture that the described imageing sensor of detecting real-time is taken, if exist area to continue to surpass Preset Time at same position less than the speck of preset area thresholding in the described imagery zone, then will be added into described shielding area with this speck same position, zone of the same area.Because the situation that dynamically shielding needle is right when being the electronic whiteboard normal operation, thereby the gamma value of imageing sensor need to be reset back conventional the value.
In above-mentioned steps d, the preset area thresholding can be that the user is predefined according to actual conditions, and it for example can be 40 pixels normally take pixel as the unit.Preset Time also is that the user is predefined according to actual conditions, for example can be 15 seconds.In steps d, if detect the hot spot that exists greater than the preset area thresholding, can also send prompting to the user, there be strong the interference in prompting user, can also forbid operation and control to mouse.
Below with reference to Fig. 3 and Fig. 4, adopt an example that above-mentioned noise spot automatic shield method is elaborated.
At first in conjunction with Fig. 3, Fig. 5 and Fig. 6, at step S301 place, the static shielding of beginning in the time of for example can being the electronic whiteboard startup, begins when perhaps user's manual operation starts static function of shielding.
At step S302 place, display device shows full frame highlighted background afterwards, and with number of processes totalizer K return-to-zero.Wherein, the brightness of highlighted background need to be lower than the brightness of control hot spot.In this step, the gamma value of imageing sensor can also be turned down, in order to expose potential whole interference sources.
At step S303 place, at the interference region 52 of imagery zone 51 interior search brightness greater than default luminance threshold T.
Execution in step S304 afterwards judges the area of the interference region 52 that finds, if greater than preset area thresholding S, then jump to step S309, there is severe jamming in prompting user, forbids the light pen operation, and and then advance to step S310, withdraw from this static shielding process.
If the determination result is NO at step S304 place, then execution in step S305 adds interference region 52 in original shielding area 50 to.In actual use, the bitmap of shielding area can be done logic and operation with the picture that imageing sensor photographs in real time, realizes function of shielding with this.
Execution in step S306 afterwards, the value of number of processes totalizer K increases progressively 1.Next whether execution in step S307 judges K greater than the need number of times upper limit to be processed N, and if so, then expression is finished, and advances to step S308, withdraws from static shielding; Otherwise expression also is not finished, and is back to step S303, continues to seek interference region.
In conjunction with Fig. 4, Fig. 7 and Fig. 8 dynamic shielding process is elaborated afterwards.
After the static state shielding finishes, the gamma value of imageing sensor can be returned to conventional value, electronic whiteboard begins normal use, namely allows the user to adopt light pen or other instruments to operate.In the electronic whiteboard course of normal operation, the operation that dynamically shields in real time.
At step S401 place, dynamically shielding beginning.
At step S402 place, will record array A and empty, with the match flag set FALSE of each element units wherein.
Execution in step S403 afterwards, the hot spot 53 in the detecting real-time imagery zone saves as tabulation B with the result.
Execution in step S404 judges among the tabulation B whether exist area greater than the hot spot of thresholding area S, if so, then to go to step S409 afterwards, and there be strong the interference in prompting user, and then advances to step S410, finishes.
If the determination result is NO among the step S404, then advance to step S405, each element among the tabulation B and the element that records among the array A are carried out the position relevant matches, if the match is successful, the hot spot sustainable existence that then represents this position, the match flag of element units corresponding among the record array A is set to TRUE, and the luminous point of coupling is removed from tabulation B.
Execution in step S406 removes the element units that records match flag position FALSE among the array A afterwards.
Next execution in step S407 is added to element units remaining among the tabulation B among the record array A as new hot spot, and the information such as moment of generating of record, position, area.
At step S408 place, seek the hot spot 53 that the distance of preserving among the record array A surpasses 15s at present constantly, will be added in the shielding area 50 with hot spot 53 positions, zone that area is identical, be back to afterwards step S403, proceed detecting.
Need to prove, more than only be a nonrestrictive example, can also dynamically shield in the following way in other embodiments: set up array A, be used for the position, size of record hot spot and moment of appearance for the first time; For the first time dynamically during masking operation, with position, the size of the hot spot that detects and go out to be recorded in now among the array A; When masking operation for the second time dynamically, the facula position that records among the facula position that newly detects and the array A is mated, if the identical hot spot in location then is retained in it among array A; If the facula position of a certain unit record among the array A and current detection to any facula position do not mate, then with the deletion of this data cell; If does not mate the position of any data cell among the hot spot that newly detects and the data A, then go out to be inserted into now among the array A position, area, the first time with this hot spot; And so forth, if the hot spot that records among the array A has above Preset Time (for example 15s), and its area is less than the preset area thresholding, then will add in the shielding area with this facula position, zone that area is identical, thereby should disturb the hot spot shielding.If finding has facula area greater than the preset area thresholding, duty prompting user serious interference, and the operation of forbidding light pen.
With reference to figure 9, the noise spot automatic shield device of present embodiment comprises static shroud module 50, dynamic shroud module 54 and reminding module 55, and wherein static shroud module 50 comprises the first driver module 51, the second driver module 52 and analyzes shroud module 53.
Display device full screen display detection background on display plane that the first driver module 51 drives in the electronic whiteboard, the brightness of detection background is lower than the brightness of described control hot spot, when showing detection background, the gamma value of imageing sensor can also be turned down the conventional gamma value of imageing sensor when making it be lower than the electronic whiteboard routine work.The imageing sensor that the second driver module 52 drives in the electronic whiteboard is taken the detection background that shows on the display plane.The imagery zone of analyzing in 53 pairs of imageing sensor shooting picture of shroud module is analyzed, and brightness is added into existing shielding area greater than the interference region of presetting luminance threshold.Wherein, the first driver module drives 51 display devices and shows that after the detection background, the second driver module 52 can drive imageing sensor and take repeatedly, by analyze 53 pairs of shroud modules clap at every turn picture carry out analyzing and processing.
The continuous multiple frames picture that dynamic shroud module 54 detecting real-time imageing sensors are taken, if exist area to continue to surpass Preset Time at same position less than the speck of preset area thresholding in the imagery zone, then will be added into existing shielding area with this speck same position, zone of the same area.
Reminding module 55 with analyze shroud module 53 and dynamically shroud module 54 link to each other, when occurring area greater than the speck of preset area thresholding in imagery zone, there is strongly interference in prompting user.
The more detailed course of work about noise spot automatic shield device shown in Figure 9 can referring to earlier figures 2 to Fig. 8 and associated description, repeat no more here.
Device shown in Figure 9 can adopt the mode of software program to realize, perhaps also can adopt the mode of programmable hardware or special IC (ASIC) to realize.This device can be integrated in the display device, for example adopts the mode of special IC to be integrated in the projector; Also can adopt the mode of software program to be integrated in the main frame 104 in the electronic whiteboard (Fig. 1).
Although the present invention with preferred embodiment openly as above; but it is not to limit the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; can make possible change and modification, so protection scope of the present invention should be as the criterion with the scope that claim of the present invention was defined.
Claims (10)
1. noise spot automatic shield method based on the electronic whiteboard of imageing sensor, described electronic whiteboard is configured to be used with display device, and described display device is used for presenting the demonstration image at display plane, and described electronic whiteboard comprises:
Be used for taking the imageing sensor of described display plane, the picture that described imageing sensor photographs comprises imagery zone and the shielding area except described imagery zone;
With the control assembly that described display device links to each other with imageing sensor, be used for locating the control hot spot in the described imagery zone;
It is characterized in that described noise spot automatic shield method comprises:
Step a drives described display device full screen display detection background on described display plane, and the brightness of described detection background is lower than the brightness of described control hot spot;
Step b drives described imageing sensor the detection background that shows on the described display plane is taken;
Step c analyzes the imagery zone in the described imageing sensor shooting picture, and brightness is added into described shielding area greater than the interference region of presetting luminance threshold.
2. noise spot automatic shield method according to claim 1 is characterized in that described step a also comprises: the gamma value of described imageing sensor is turned down, made it be lower than conventional value.
3. noise spot automatic shield method according to claim 1 is characterized in that, also comprises: repeating said steps b and step c many times.
4. noise spot automatic shield method according to claim 1 is characterized in that, also comprises:
Steps d, gamma value at described imageing sensor is in the situation of conventional value, the continuous multiple frames picture that the described imageing sensor of detecting real-time is taken, if exist area to continue to surpass Preset Time at same position less than the speck of preset area thresholding in the described imagery zone, then will be added into described shielding area with this speck same position, zone of the same area.
5. noise spot automatic shield method according to claim 4 is characterized in that, in described step c or steps d, if exist area greater than the speck of described preset area thresholding in the described imagery zone, then there be strong the interference in prompting user.
6. noise spot automatic shield device based on the electronic whiteboard of imageing sensor, described electronic whiteboard is configured to be used with display device, and described display device is used for presenting the demonstration image at display plane, and described electronic whiteboard comprises:
Be used for taking the imageing sensor of described display plane, the picture that described imageing sensor photographs comprises imagery zone and the shielding area except described imagery zone;
With the control assembly that described display device links to each other with imageing sensor, be used for locating the control hot spot in the described imagery zone;
It is characterized in that described noise spot automatic shield device comprises:
The first driver module drives described display device full screen display detection background on described display plane, and the brightness of described detection background is lower than the brightness of described control hot spot;
The second driver module drives described imageing sensor the detection background that shows on the described display plane is taken;
Analyze shroud module, the imagery zone in the described imageing sensor shooting picture is analyzed, brightness is added into described shielding area greater than the interference region of presetting luminance threshold.
7. noise spot automatic shield device according to claim 6 is characterized in that, described the first driver module is also turned the gamma value of described imageing sensor down, makes it be lower than conventional value.
8. noise spot automatic shield device according to claim 6, it is characterized in that, described the first driver module drives described display device after full screen display detection background on the described display plane, described the second driver module drives described imageing sensor and takes repeatedly, and described analysis shroud module is processed respectively the picture of each shooting gained.
9. noise spot automatic shield device according to claim 6 is characterized in that, also comprises:
Dynamic shroud module, gamma value at described imageing sensor is in the situation of conventional value, the continuous multiple frames picture that the described imageing sensor of detecting real-time is taken, if exist area to continue to surpass Preset Time at same position less than the speck of preset area thresholding in the described imagery zone, then will be added into described shielding area with this speck same position, zone of the same area.
10. noise spot automatic shield device according to claim 9 is characterized in that, also comprises:
Reminding module links to each other with dynamic shroud module with described analysis shroud module, if exist area greater than the speck of described preset area thresholding in the described imagery zone, then there be strong the interference in prompting user.
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| CN106681569A (en) * | 2016-12-07 | 2017-05-17 | 南京仁光电子科技有限公司 | Touch optimizing method and device |
| CN107132962A (en) * | 2017-05-02 | 2017-09-05 | 青岛海信移动通信技术股份有限公司 | Navigation bar control method and device |
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| US20110169777A1 (en) * | 2010-01-12 | 2011-07-14 | Seiko Epson Corporation | Image processing apparatus, image display system, and image processing method |
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| CN102043541A (en) * | 2009-10-14 | 2011-05-04 | 谭登峰 | General optical touch screen |
| US20110169777A1 (en) * | 2010-01-12 | 2011-07-14 | Seiko Epson Corporation | Image processing apparatus, image display system, and image processing method |
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