CN102999230A - Electronic whiteboard equipment automatic pixel mapping method - Google Patents
Electronic whiteboard equipment automatic pixel mapping method Download PDFInfo
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- CN102999230A CN102999230A CN2012104352443A CN201210435244A CN102999230A CN 102999230 A CN102999230 A CN 102999230A CN 2012104352443 A CN2012104352443 A CN 2012104352443A CN 201210435244 A CN201210435244 A CN 201210435244A CN 102999230 A CN102999230 A CN 102999230A
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Abstract
The invention discloses an electronic whiteboard equipment automatic pixel mapping method. When collecting the information of a positioned light spot on an image pickup plane, the image information on the image pickup plane is continuously collected twice, wherein the projection of a positioned light spot exists during the first collection, and the image collected in the first collection is recorded as B; in the second collection, the projection of the positioned light spot does not exist, and the image collected in the second collection is recorded as A; and then, the information of the positioned light spot is obtained through a formula C=B-A. The electronic whiteboard equipment automatic pixel mapping method provided by the invention collects the information of the positioned light spot by an image subtraction method and can avoid the participation of an interference light spot into calculation; and meanwhile, the collection quality of the positioned light spot can be improved through the setting of a filter, and the projection-image pickup mapping accuracy is improved.
Description
Technical field
The present invention relates to electronic white board equipment, relate in particular to the automatic pixel mapping method of electronic white board equipment.
Background technology
As shown in Figure 1 and Figure 2, electronic white board equipment 3 is a kind of with no paper office equipment that cooperate projector 2, projection screen 4, infrared stylus, PC 1 to use.During installation, electronic white board equipment 3 cooperates projector 2 relative projection screens 4 to install, and projector 2 can form projection plane P2 at projection screen 4, and electronic white board equipment 3 can form image pickup plane P3 at projection screen 4, and the complete cover projection plane of image pickup plane P3 P2; During use, PC 1 will need the image information that shows (for convenience of description by projector 2, be display screen plane P 1 hereinafter referred to as 1 image information that need to show in the PC) be projected in and form projection plane P2 on the projection screen 4,3 pairs of projection screens 4 of electronic white board equipment are made a video recording and are formed image pickup plane P3, manually press infrared stylus and produce hot spot at projection plane P2 and image pickup plane P3 simultaneously, 3 pairs of facula information of electronic white board equipment gather, and according to the mapping relations between projection plane P2 and the image pickup plane P3, calculate the positional information of hot spot on display screen plane P 1, realize the operation of mouse.
In this process, be direct communication between PC 1 and the projector 2, between PC 1 and the electronic white board equipment 3, thus between display screen plane P 1 and the projection plane P2 between mapping relations, display screen plane P 1 and the image pickup plane P3 of coordinate the mapping relations of coordinate known.Can set: the coordinate of hot spot on projection plane P2 be for (x, y), and it is mapped as f (x, y) on display screen plane P 1; The coordinate of hot spot on image pickup plane P3 is (a, b), and it is mapped as h (a, b) on display screen plane P 1; By aforementioned analysis as can be known, the coordinate on image pickup plane P3 is (a to hot spot at the coordinate (x, y) on the projection plane P2 and hot spot, b) be known quantity, f (x, y) and h (a, b) be known function, and for a known hot spot f (x, y) and h (a, b) calculated value equates, is designated as (m, n), i.e. (m, n)=f (x, y)=h (a, b).
Know in theory the coordinate (x, y) of hot spot on projection plane P2, just can calculate its mapping on the display screen plane according to function f (x, y), but projector 2 can't feedback coordinates (x, y); And electronic white board equipment 3 can feedback coordinates (a, b), can calculate its mapping on display screen plane P 1 according to function h (a, b); Calculate like this and get access to (x, y) and (a, b) mapping relations between (being the mapping relations between projection plane P2 and the image pickup plane P3) just can obtain f (x, y) indirectly, set up hot spot on the projection plane P2 and the contact between the display screen plane P 1.And the mapping relations between projection plane P2 and the image pickup plane P3 can change because of the factor such as the mounting means of whole device, installation site, in order to guarantee the result of use of whole device, all must carry out projection-shooting mapping correction before first the use.
Traditional projection-shooting map correction method is manual pixel mapping method, at first pass through PC 1 in projection plane P2 demonstration some location spot 8 as shown in Figure 3, then manually press infrared stylus centering hot spot, 3 pairs of location spot 8 of electronic white board equipment and centering hot spot gather, calculate the one by one mapping relations that obtain between projection plane P2 and the image pickup plane P3 by processor, obtain mapping function (a, b)=g (x, y).This manual pixel mapping method relies on manually-operated, waste time and energy, adopt now automatic pixel reflection method for this problem, at first show some location spot 8 by PC 1 at projection plane P2, then electronic white board equipment 3 active centering location spot 8 are calculated the one by one mapping relations that obtain between projection plane P2 and the image pickup plane P3 by processor, obtain mapping function (a, b)=g (x, y).
But the pixel reflection method is disturbed the light source interference easily automatically, the centering mistake appears, reason is when whole device uses, the non-infrared stylus light source that appears on the image pickup plane (is stray light, comprise sunlight or light) may be collected by electronic white board equipment 3, produce maloperation or interference when causing occurring not having infrared stylus operated, and the visible light part of these stray lights is stronger, for fear of stray light, light path at electronic white board equipment 3 is provided with filter, the filtering visible light collects stray light to avoid electronic white board equipment 3.Because the light that infrared stylus sends is non-visible light, it is less affected by filter, still can accurately be collected by electronic white board equipment 3, manually presses infrared stylus centering hot spot and wrong situation generally can not occur gathering.And adopt electronic white board equipment 3 initiatively during centering location spot 8, and because 8 of location spot, see through filter as visible light and location spot 8 is gathered can occur underexposedly, cause to gather error, projection-shooting mapping correction can't be carried out.
During for electronic white board equipment 3 active centering location spot 8, the underexposed problem of location spot 8 appears, general employing two waveband filter is replaced and originally was arranged on the filter that arranges on the light path of electronic white board equipment 3 now, the two waveband filter can keep a part of visible light, the sensitization of location spot 8 when guaranteeing automatic pixel mapping; But the two waveband filter is so that the logical light enhancing of visible light, can allow infrared stylus visible light in addition be collected by electronic white board equipment 3 during normal the use, produce maloperation or interference when again causing occurring not having infrared stylus operated, for this reason again must extension circuit, increase gets rid of stray light operation time.
In addition as shown in Figure 4, when automatic pixel mapping, image pickup plane P3 is upper except location spot 8 occurring, hot spot 5 also might appear disturbing, the image of 3 couples of whole image pickup plane P3 of electronic white board equipment gathers, with location spot 8 with disturb the information of hot spot 5 to collect in the processor simultaneously and calculate, miscount will inevitably appear, so that the one by one mapping relations between projection plane P2 and the image pickup plane P3 are made mistakes.
Moreover, when automatic pixel mapping, the row operation of going forward side by side of the image collection of 3 couples of whole image pickup plane P3 of electronic white board equipment, larger to the capacity requirement of storer, improved cost and the volume of whole device.
Simultaneously, because the difference of environment for use, the position that electronic white board equipment 3 cooperates projector 2 relative projection screens 4 to install is also different, with general installation custom, the mounting means of electronic white board equipment 3 has two kinds, and a kind of is formal dress, and another kind is anti-dress: if electronic white board equipment 3 is installed in the formal dress mode, the shown picture visual angle of projection plane P2 and image pickup plane P3 is consistent, may have slightly deviation because of the deviation of installing; If electronic white board equipment 3 is installed in anti-dress mode, there is 180 ° upset in the shown picture visual angle of projection plane P2 and image pickup plane P3, may be because of the deviation existence deviation slightly of installing.In order accurately to obtain the one by one mapping relations between projection plane P2 and the image pickup plane P3, need artificial selection to go out the mounting means of electronic white board equipment 3, otherwise will be difficult to know out one by one mapping relations between projection plane P2 and the image pickup plane P3 by re-set target, and not have at present a kind of method that can automatically identify electronic white board equipment 3 mounting meanss.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the invention provides the automatic pixel mapping method of a kind of electronic white board equipment, minimizing to the demand of storer, improve the acquisition quality to location spot, can automatically calculate the position relationship of display screen plane, projection plane and the shown picture of image pickup plane simultaneously.
Technical scheme: for achieving the above object, the technical solution used in the present invention is:
The automatic pixel mapping method of a kind of electronic white board equipment, to the location spot information on the image pickup plane time, double image information on this image pickup plane is gathered: wherein once gather the projection that has location spot, the image of remembering this time collection is B; Another time gathers the projection (blank screen of namely usually saying) without location spot, and the image of remembering this another time collection is A; Then obtain location spot information by C=B-A.
Said method requires the double time interval that image information on this image pickup plane is gathered short as far as possible, identical to guarantee the collection of disturbing hot spot, disturb hot spot if exist on the B image that collects, on the A image, also exist like this and disturb hot spot, subtract each other the image that just only stays location spot, the image of having removed the interference hot spot.
Because when projection goes out location spot on projection plane, the interference hot spot that may have other exists, such as light or sunlight etc., like this when image pickup plane being positioned collection, just might collect simultaneously the image of location spot and interference hot spot, because processor can't be distinguished location spot and disturb hot spot, therefore can calculate all images that collects, so that error even mistake appear in result of calculation, so that projection-shooting mapping is proofreaied and correct unsuccessfully; Can avoid the stray light articulate fascia is entered to calculate by said method, improve computational accuracy.
Preferred location spot is the white light hot spot, and described facula information is the gray scale/brightness value of hot spot; This is because the light intensity of white light hot spot is the highest, and is therefore the easiest to be collected; To the shape of location spot in general without limits, can be circular or square.
Owing to be provided with filter in the light path that gathers the image pickup plane image in the prior art, the filtering visible light guarantees that the later stage only collects the light that infrared stylus sends when using; But in projection-shooting mapping trimming process, location spot has been subdued sensitization intensity for avoiding location spot by filter originally as visible light, before image pickup plane is carried out image acquisition, at first removes the filter that is arranged on the light path that gathers the image pickup plane image; After projection-shooting mapping was proofreaied and correct and finished, the filter that resets guaranteed the later stage use.
Because the difference of environment for use, the installation site of projector equipment and picture pick-up device can be different, be formal dress or the anti-dress of picture pick-up device, in order accurately to obtain the mapping relations between projection plane and the image pickup plane, as follows detection of projection devices and picture pick-up device relative installation:
(a) projection goes out a location spot on projection plane;
(b) obtain the coordinate of this location spot on image pickup plane;
(c) according to the coordinate of location spot on projection plane and image pickup plane, obtain projector equipment and picture pick-up device relative installation.
In the above-mentioned steps, in order to simplify computation process, preferably allow location spot be positioned at the projection plane line of symmetry with external position, most preferably be positioned at four bights of projection plane.Go out a location spot such as us in the first quartile projection of projection plane, if the coordinate of this location spot on image pickup plane is positioned at third quadrant, we just can know that projector equipment and picture pick-up device oppositely installed; If the coordinate of this school locating spot on image pickup plane is positioned at first quartile, we just can know that projector equipment and picture pick-up device forward installed.
Beneficial effect: the automatic pixel mapping method of electronic white board equipment provided by the invention, adopt the method for image subtraction to the information of location spot, can avoid the stray light articulate fascia is entered to calculate; The simultaneously setting by filter can improve the acquisition quality to location spot, improves the accuracy that projection-shooting is shone upon.
Description of drawings
Fig. 1 is the applied system architecture synoptic diagram of this method;
Fig. 2 is the location diagram between projection screen, projection plane and the image pickup plane;
Location spot was projected in the synoptic diagram on projection plane and the image pickup plane when Fig. 3 disturbed hot spot for not existing, simultaneously also for calculate the synoptic diagram of the C that obtains by the inventive method;
Location spot was projected in the synoptic diagram on projection plane and the image pickup plane when Fig. 4 disturbed hot spot for existing, and was the synoptic diagram of B for the image that collects by the inventive method also simultaneously;
Fig. 5 is the synoptic diagram that among the embodiment image pickup plane is divided into m unit;
Fig. 6 is the synoptic diagram of A for the image that collects by the inventive method.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described.
The automatic pixel mapping method of electronic white board equipment comprises the steps:
(1) rectangular node take unit length as the n=3 pixel is divided into m unit 6 with image pickup plane P3 as shown in Figure 5, and each unit 6 comprises n * n=3 * 3=9 pixel 7, sets period k=1;
(2) project some location spot 8 at projection plane P2 and image pickup plane P3;
(3) image of positioning acquisition image pickup plane P3 on j=k the pixel in all m unit gathers the gray scale/brightness value of location spot on this m pixel, gray scale/brightness value reached the location spot image calculation center-of-gravity value G on the pixel of setting value
Ij, store this center-of-gravity value;
(4) k=k+1 judges whether k≤n * n sets up, if judge establishment, then returns step (3);
(5) if step (4) is judged to be false, all of the same location spot of correspondence are calculated the center-of-gravity value that obtains get geometric mean, obtain the elements of a fix of this location spot on image pickup plane P3;
(6) according to the location spot coordinate on projection plane P2 and image pickup plane P3 respectively, set up the mapping relations between projection plane P2 and the image pickup plane P3.
In the said process, projection plane P2 is projector 2 on the plane that projection screen 4 forms, and image pickup plane P3 is the plane of making a video recording and absorb in 3 pairs of projecting planes of electronic white board equipment; Synoptic diagram when Fig. 5 gathers for the first time for us, wherein black pixel point 7 is zones that we gather, the position that location spot 8 and black pixel point 7 overlaps among the figure is the light spot image that collects, and we have just collected all image informations of location spot 8 after carrying out 9 image acquisition.
This example adopts the circular location spot 8 of 7 * 7 white lights to carry out projection-shooting mapping and proofreaies and correct, for avoiding interference the interference of hot spot 5, in step (3), the image of positioning acquisition image pickup plane P3 on all m unit 6 j=k pixel 7, gather the method for the gray scale/brightness value of location spot 8 on this m pixel, be specially: at first double the image of image pickup plane P3 on all m unit 6 j=k pixel 7 positioned collection, there is the projection of location spot 8 when wherein one-time positioning gathers, the image that collects as shown in Figure 4, the image of remembering this time collection is B, during another time positioning acquisition without the projection of location spot 8, the image that collects as shown in Figure 6, the image of remembering this time collection is A; Then obtain the overlay image of location spot 8 on this m pixel by C=B-A, result of calculation obtains coverage rate as shown in Figure 3.
For avoiding location spot 8 to be subdued sensitization intensity by filter, before image pickup plane P3 is carried out image acquisition, at first remove the filter that is arranged on the light path that gathers image pickup plane P3 image; After projection-shooting mapping was proofreaied and correct and finished, the filter that resets guaranteed the later stage use.
This case is detection of projection devices and picture pick-up device relative installation as follows:
(a) projection goes out a location spot 8 on projection plane P2;
(b) obtain the elements of a fix of this location spot 8 on image pickup plane P3;
(c) according to the coordinate of location spot 8 on projection plane P2 and image pickup plane P3, obtain projector equipment and picture pick-up device relative installation.
The above only is preferred implementation of the present invention; be noted that for those skilled in the art; under the prerequisite that does not break away from the principle of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (6)
1. the automatic pixel mapping method of electronic white board equipment, it is characterized in that: to the location spot information on the image pickup plane time, double image information on this image pickup plane is gathered: have the projection of location spot when wherein once gathering, the image of remembering this time collection is B; Without the projection of location spot, the image of remembering this another time collection was A when another time gathered; Then obtain location spot information by C=B-A.
2. the automatic pixel mapping method of electronic white board equipment according to claim 1, it is characterized in that: described location spot is the white light hot spot.
3. the automatic pixel mapping method of electronic white board equipment according to claim 1, it is characterized in that: described facula information is the gray scale/brightness value of hot spot.
4. the automatic pixel mapping method of electronic white board equipment according to claim 1 is characterized in that: before to the location spot information on the image pickup plane, at first remove the filter that is arranged on the light path that gathers the image information on the image pickup plane.
5. the automatic pixel mapping method of electronic white board equipment according to claim 1, it is characterized in that: also comprise the step of detection of projection devices and picture pick-up device relative installation, this step specifically comprises the steps:
(a) projection goes out a location spot on projection plane;
(b) obtain the coordinate of this location spot on image pickup plane;
(c) according to the coordinate of location spot on projection plane and image pickup plane, obtain projector equipment and picture pick-up device relative installation.
6. the automatic pixel mapping method of electronic white board equipment according to claim 5, it is characterized in that: described location spot is positioned at the projection plane line of symmetry with external position.
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| CN2012104352443A CN102999230A (en) | 2012-11-05 | 2012-11-05 | Electronic whiteboard equipment automatic pixel mapping method |
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| CN109637389A (en) * | 2019-02-01 | 2019-04-16 | 京东方科技集团股份有限公司 | Display panel and its control method and display device |
| CN113497923A (en) * | 2020-03-18 | 2021-10-12 | 中强光电股份有限公司 | Projection system and positioning method for projection system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113497923B (en) * | 2020-03-18 | 2023-10-31 | 中强光电股份有限公司 | Projection system and positioning method for projection system |
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Application publication date: 20130327 |