CN102880356A - Method for realizing dual-pen writing based on electronic white board - Google Patents
Method for realizing dual-pen writing based on electronic white board Download PDFInfo
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- CN102880356A CN102880356A CN201210338872XA CN201210338872A CN102880356A CN 102880356 A CN102880356 A CN 102880356A CN 201210338872X A CN201210338872X A CN 201210338872XA CN 201210338872 A CN201210338872 A CN 201210338872A CN 102880356 A CN102880356 A CN 102880356A
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Abstract
The invention provides a method for realizing dual-pen writing based on an electronic white board. A PC (Personal Computer) machine, two handwriting pens capable of emitting infrared light with different wavelengths, and first and second cameras corresponding to the two handwriting pens arranged on the electronic white board are all provided in the method; the electronic white board comprises a single chip, an FPGA (Field Programmable Gate Array) chip and an SDRAM (Synchronous Dynamic Random Access Memory) chip; and the FPGA chip comprises an image acquisition module, an image storage module, a single chip interface and an image processing module. According to the method, the two cameras are used for detecting the states of the corresponding handwriting pens respectively; the image acquisition module is used for acquiring the image data of the cameras; the image storage module is used for storing the image data into the SDRAM chip; and meanwhile, the image processing module is used for calculating so as to obtain coordinates of light spots reserved by the handwriting pens, and the PC machine is used for displaying the coordinates of the light spots to achieve the purpose that the two handwriting pens can be used for writing at the same moment so as to better realize interactive electronic teaching, interactive conference, training and the like.
Description
[technical field]
The present invention relates to a kind of electronic whiteboard technical field, relate in particular to a kind of method that realizes double-pen writing based on electronic whiteboard.
[background technology]
Electronic whiteboard is a newer product, electronic whiteboard is a kind of computer entry device, use a special pen, writing words or graphing in specific zone, it is by using electromagnetic induction principle, can be in conjunction with computing machine and projector, realize with no paper office and teaching, it is can be as common blank or the blackboard for education direct with writing, and then is passed in the computer and goes, with respect to projector, common blank, electronic whiteboard has the advantage of himself.
Present electronic whiteboard is comprised of writing pencil, blank plate body and chip circuit usually, and described blank plate body comprises a writing layer, an inductive layer; During use, the USB that passes through of electronic whiteboard and computer is turned serial port connecting wire and is connected.Its principle of work is: writing pencil is write at the writing layer of blank plate body, thereby send electromagnetic wave signal, the blank plate body is transferred on the chip by inductive layer reception electromagnetic wave signal again and processes, obtain pulse, send into again calculating that the processor of single chip computer module carries out pulse width with and the counting of pulse number finally obtain the accurate coordinates of writing pencil on electronic whiteboard, at last coordinate information is turned serial port connecting wire by the communication module conversion by USB and sends to computer.
Present orthogonal projection on the market all is to adopt a camera as electronic whiteboard, and it generally realizes two pens at software in order to realize dual-stylus writing function, and this implementation is not truly two.The present invention adopts two cameras, two kinds of optical filters, two kinds of light pens, thereby the real two pens on the realization hardware.
A kind of " electronic whiteboard of tool dual-stylus writing function " is provided in the prior art, see that publication number is: CN201876859U, open day be: the Chinese patent of 2011.06.22, it comprises a blank plate body of connection, one core circuit plate, and two writing pencils that can send different electromagnetic signal frequencies, and on the described core circuit plate to being provided with two signal processing circuits by two writing pencils, and this two paths of signals treatment circuit all is connected to a time-sharing circuit, this time-sharing circuit connects respectively two paths of signals comparison module and two-way pulse detection module again, and this two paths of signals comparison module is connected with two-way pulse detection module and is connected a single chip processing module.The advantage of this utility model is: be equipped with two lettering pens that can send different electromagnetic signal frequencies, the two paths of signals treatment circuit is set again, carry out time-division processing by time-sharing circuit, the realization synchronization can be write with two pens, to realize better interactive electronic teaching, interactive meeting, training etc.But this utility model does not provide the thinking of Software for Design how the two paths of signals treatment circuit is set, and carries out two signals of time-division processing by time-sharing circuit; Carry out Graphics Processing at PC after how the hot spot of writing pencil being processed through single-chip microcomputer.
The computing method of gravity model appoach are the positions that at first will mark each place in coordinate system, and purpose is to determine the relative distance of each point.Coordinate system can at will be set up.In international addressing, often adopt longitude and latitude to set up coordinate.Then, obtain position coordinates X and the Y of required point according to the transverse and longitudinal coordinate figure of each point in coordinate system, the formula that gravity model appoach uses is:
C in the formula
xThe x coordinate of-center of gravity; C
yThe y coordinate of-center of gravity; D
IxThe x coordinate in the-the i place; D
IyThe y coordinate in the-the i place; V
i-move to i place or mobile since i place.At last, select place corresponding to the focus point coordinate figure obtain as the position of required point.
[summary of the invention]
The technical problem to be solved in the present invention is to provide a kind of method that realizes double-pen writing based on electronic whiteboard, so that electronic whiteboard has dual-stylus writing function.
The present invention is achieved in that a kind of method that realizes double-pen writing based on electronic whiteboard, and described method provides the writing pencil of the infrared light that PC, two can send different wave length and the first camera, the second camera that corresponding described two writing pencils are provided with; Described electronic whiteboard comprises single-chip microcomputer, fpga chip and SDRAM chip; Described fpga chip comprises image capture module, image memory module, interface microcontroller and image processing module; Described method comprises the steps:
Sensitive chip and the fpga chip of step 1, initialization single-chip microcomputer, two cameras;
The coordinate position value of the coordinate position value of the first hot spot of each frame the first view data that step 4, described PC obtain single-chip microcomputer, the second hot spot of each frame the second view data converts the relative coordinate position of projector's picture in the relative electronic whiteboard to, be the coordinate position of writing pencil on computer screen, finish dual-stylus writing function.
The present invention has following advantage: the present invention detects respectively the state of corresponding writing pencil by two cameras, image capture module gathers the view data of each camera, and view data is stored in the SDRAM chip by the image memory module; Simultaneously, calculate the coordinate position value of the hot spot that writing pencil stays by image processing module, by PC the relative coordinate position that the coordinate position value of hot spot converts projector's picture in the relative electronic whiteboard to is shown, realized that synchronization can write with two pens, with realize better the interactive electronic teaching, interactive can be with, training etc.
[description of drawings]
Fig. 1 is the framework schematic diagram of hardware configuration of the present invention.
Fig. 2 is the inventive method schematic flow sheet.
[embodiment]
See also shown in Figure 1, a kind of method that realizes double-pen writing based on electronic whiteboard of the present invention, described method provide PC, two can send the writing pencil (not shown) of the infrared light of different wave length and the first camera, the second camera that corresponding described two writing pencils are provided with; It is the infrared light of 910 ~ 950nm that described two writing pencils can send respectively infrared light, the wavelength that wavelength is 800 ~ 900nm; The camera lens of described the first camera is provided with the first optical filter, and described the first optical filter can be the infrared light of 800 ~ 900nm by wavelength; The camera lens of described second camera is provided with the second optical filter, and described the second optical filter can be the infrared light of 910 ~ 950nm by wavelength; Described electronic whiteboard comprises single-chip microcomputer, fpga chip and SDRAM chip; Described fpga chip comprises image capture module, image memory module, interface microcontroller and image processing module; As shown in Figure 2, described method comprises the steps:
The coordinate position value of the coordinate position value of the first hot spot of each frame the first view data that step 4, described PC obtain single-chip microcomputer, the second hot spot of each frame the second view data converts the relative coordinate position of projector's picture in the relative electronic whiteboard to, be the coordinate position of writing pencil on computer screen, finish dual-stylus writing function.This PC realizes that mainly a finder positions the coordinate position value of the second hot spot of the coordinate position value of the first hot spot of each frame the first view data, each frame the second view data in projector's picture in electronic whiteboard.
Wherein, described fpga chip also comprises image display, and this image display can an external display, and the first view data of each frame that image display will collect by the VGA interface and the second view data of each frame are exported from display; Be convenient to like this angle of Installation and Debugging the first camera and second camera.
In the present embodiment, described image memory module specifically comprises: sdram controller, fifo data buffer and read-write requests control module; Described sdram controller adopts whole page or leaf image read-write mode, can improve like this utilization factor of bus.Because the present invention only uses a SDRAM chip, process simultaneously the read-write requests of image capture module, image display, three modules of image processing module, therefore for speed up processing, need to add the fifo data buffer of a string and conversion.When described image capture module deposits the second view data of the first view data of described each frame or each frame in to the SDRAM chip, the read-write requests control module triggers sdram controller work, and sdram controller is stored in the SDRAM chip after the second view data of the first view data of each frame or each frame is stored to first the fifo data buffer again; When described image processing module, image display read the second view data of the first view data of described each frame or each frame to the SDRAM chip, the read-write requests control module triggers sdram controller work, sdram controller control is read required view data after the second view data of the first view data of each frame or each frame is read first the fifo data buffer from the SDRAM chip again from the fifo data buffer.
The above only is preferred embodiment of the present invention, and all equalizations of doing according to the present patent application claim change and modify, and all should belong to covering scope of the present invention.
Claims (4)
1. method that realizes double-pen writing based on electronic whiteboard is characterized in that: described method provides the writing pencil of the infrared light that PC, two can send different wave length and the first camera, the second camera that corresponding described two writing pencils are provided with; Described electronic whiteboard comprises single-chip microcomputer, fpga chip and SDRAM chip; Described fpga chip comprises image capture module, image memory module, interface microcontroller and image processing module; Described method comprises the steps:
Sensitive chip and the fpga chip of step 1, initialization single-chip microcomputer, two cameras;
Step 2, detect respectively the state of corresponding writing pencil by described two cameras, image capture module gathers the first view data of each frame that the first camera detects, the second view data of each frame that second camera detects, and the second view data of the first view data of each frame that will gather and each frame by the control store of described image memory module in described SDRAM chip;
Step 3, described image processing module read the first view data of each frame and the second view data of each frame by the order of each two field picture that gathers from the image memory module, and obtain the second hot spot that the writing pencil of the second view data of the first hot spot that the writing pencil of the first view data of each frame stays, each frame stays; From described SDRAM chip, extract simultaneously first view data corresponding to the first hot spot of each frame, the second view data that the second hot spot of each frame is corresponding, the first view data with each frame, the brightness value of each pixel of the second view data of each frame and the threshold value of setting compare, if the brightness value of a certain pixel of the first view data of each frame, illustrate that greater than the threshold value of setting this pixel of the first view data belongs to the first hot spot with the brightness value of a certain pixel of the second view data of each frame, the pixel of the second view data belongs to the second hot spot, the second hot spot that satisfies first hot spot of each frame of threshold condition and each frame is calculated the coordinate position value of each the first hot spot by gravity model appoach, the coordinate position of each the second hot spot; Described image processing module is handled will produce a look-at-me notice single-chip microcomputer obtains coordinate position value, second view data of the first hot spot of frame the first view data corresponding to this moment by described interface microcontroller the coordinate position value of the second hot spot after the second view data of the first view data of a frame and a frame;
The coordinate position value of the coordinate position value of the first hot spot of each frame the first view data that step 4, described PC obtain single-chip microcomputer, the second hot spot of each frame the second view data converts the relative coordinate position of projector's picture in the relative electronic whiteboard to, be the coordinate position of writing pencil on computer screen, finish dual-stylus writing function.
2. a kind of method that realizes double-pen writing based on electronic whiteboard according to claim 1, it is characterized in that: described fpga chip also comprises image display, this image display can an external display, and the first view data of each frame that image display will collect by the VGA interface and the second view data of each frame are exported from display; Be convenient to like this angle of Installation and Debugging the first camera and second camera.
3. a kind of method that realizes double-pen writing based on electronic whiteboard according to claim 1, it is characterized in that: described initialization single-chip microcomputer is specially: the clock of electronic whiteboard is set, the USB interface of initialization single-chip microcomputer, the HID agreement of configuration USB interface; The sensitive chip of two cameras of described initialization is specially: image output format, the exposure value of configuration sensitive chip; Described initialization fpga chip is specially: arrange image luminance threshold, the memory address of image is set.
4. a kind of method that realizes double-pen writing based on electronic whiteboard according to claim 2, it is characterized in that: described image memory module specifically comprises: sdram controller, fifo data buffer and read-write requests control module; When described image capture module deposits the second view data of the first view data of described each frame or each frame in to the SDRAM chip, the read-write requests control module triggers sdram controller work, and sdram controller is stored in the SDRAM chip after the second view data of the first view data of each frame or each frame is stored to first the fifo data buffer again; When described image processing module, image display read the second view data of the first view data of described each frame or each frame to the SDRAM chip, the read-write requests control module triggers sdram controller work, sdram controller control is read required view data after the second view data of the first view data of each frame or each frame is read first the fifo data buffer from the SDRAM chip again from the fifo data buffer.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103247054A (en) * | 2013-05-17 | 2013-08-14 | 北京航空航天大学 | Target observing and sighting point real-time location device and method based on FPGA (field programmable gate array) |
| CN103294316A (en) * | 2013-05-27 | 2013-09-11 | 广东威创视讯科技股份有限公司 | Touch positioning system |
| CN105511616A (en) * | 2015-12-07 | 2016-04-20 | 联想(北京)有限公司 | Information processing method and electronic equipment |
| CN105653025A (en) * | 2015-12-22 | 2016-06-08 | 联想(北京)有限公司 | Information processing method and electronic equipment |
| CN103955318B (en) * | 2014-04-30 | 2016-11-16 | 锐达互动科技股份有限公司 | Double pens are identified by photoelectricity interaction module and double pen near time differentiating method |
| CN103941872B (en) * | 2014-04-25 | 2017-02-15 | 锐达互动科技股份有限公司 | Interactive projection method for achieving writing with two pens and writing with two pens approaching to each other infinitely |
| WO2018171363A1 (en) * | 2017-03-24 | 2018-09-27 | 西安中兴通讯终端科技有限公司 | Position information determining method, projection device and computer storage medium |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1932726A (en) * | 2006-10-13 | 2007-03-21 | 广东威创日新电子有限公司 | Digital image sensor locator based on CMOS and locating method |
| CN101042625A (en) * | 2006-03-22 | 2007-09-26 | 深圳市巨龙科教高技术股份有限公司 | Electromagnetic induction interactive electronic white board and system thereof |
| CN201535956U (en) * | 2009-07-24 | 2010-07-28 | 王昊 | Optical positioning point-to-read machine |
| CN101819476A (en) * | 2010-04-09 | 2010-09-01 | 浙江大学 | Alternating current pointing light pen, multi-light-pen identification device and method of multi-light-pen identification |
| CN102236461A (en) * | 2011-04-13 | 2011-11-09 | 南昊（北京）科技有限公司 | Multi-input interactive system and method |
| US20120044140A1 (en) * | 2010-08-19 | 2012-02-23 | Sanyo Electric Co., Ltd. | Information display system and program, and optical input system, projection-type images and display apparatus |
| CN202167002U (en) * | 2011-06-16 | 2012-03-14 | 上海易视计算机科技有限公司 | Multipoint touch optical electronic whiteboard with auto-correction function |
-
2012
- 2012-09-13 CN CN201210338872XA patent/CN102880356A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101042625A (en) * | 2006-03-22 | 2007-09-26 | 深圳市巨龙科教高技术股份有限公司 | Electromagnetic induction interactive electronic white board and system thereof |
| CN1932726A (en) * | 2006-10-13 | 2007-03-21 | 广东威创日新电子有限公司 | Digital image sensor locator based on CMOS and locating method |
| CN201535956U (en) * | 2009-07-24 | 2010-07-28 | 王昊 | Optical positioning point-to-read machine |
| CN101819476A (en) * | 2010-04-09 | 2010-09-01 | 浙江大学 | Alternating current pointing light pen, multi-light-pen identification device and method of multi-light-pen identification |
| US20120044140A1 (en) * | 2010-08-19 | 2012-02-23 | Sanyo Electric Co., Ltd. | Information display system and program, and optical input system, projection-type images and display apparatus |
| CN102236461A (en) * | 2011-04-13 | 2011-11-09 | 南昊（北京）科技有限公司 | Multi-input interactive system and method |
| CN202167002U (en) * | 2011-06-16 | 2012-03-14 | 上海易视计算机科技有限公司 | Multipoint touch optical electronic whiteboard with auto-correction function |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103247054A (en) * | 2013-05-17 | 2013-08-14 | 北京航空航天大学 | Target observing and sighting point real-time location device and method based on FPGA (field programmable gate array) |
| CN103247054B (en) * | 2013-05-17 | 2016-06-29 | 北京航空航天大学 | A kind of target based on FPGA is seen and is taken aim at a real-time positioning apparatus and method |
| CN103294316A (en) * | 2013-05-27 | 2013-09-11 | 广东威创视讯科技股份有限公司 | Touch positioning system |
| CN103294316B (en) * | 2013-05-27 | 2016-04-27 | 广东威创视讯科技股份有限公司 | A kind of touching and positioning system |
| CN103941872B (en) * | 2014-04-25 | 2017-02-15 | 锐达互动科技股份有限公司 | Interactive projection method for achieving writing with two pens and writing with two pens approaching to each other infinitely |
| CN103955318B (en) * | 2014-04-30 | 2016-11-16 | 锐达互动科技股份有限公司 | Double pens are identified by photoelectricity interaction module and double pen near time differentiating method |
| CN105511616A (en) * | 2015-12-07 | 2016-04-20 | 联想(北京)有限公司 | Information processing method and electronic equipment |
| CN105511616B (en) * | 2015-12-07 | 2019-01-15 | 联想(北京)有限公司 | A kind of information processing method and electronic equipment |
| CN105653025A (en) * | 2015-12-22 | 2016-06-08 | 联想(北京)有限公司 | Information processing method and electronic equipment |
| CN105653025B (en) * | 2015-12-22 | 2019-12-24 | 联想(北京)有限公司 | Information processing method and electronic equipment |
| WO2018171363A1 (en) * | 2017-03-24 | 2018-09-27 | 西安中兴通讯终端科技有限公司 | Position information determining method, projection device and computer storage medium |
| CN108628487A (en) * | 2017-03-24 | 2018-10-09 | 西安中兴通讯终端科技有限公司 | A kind of method of determining position information, projection device and computer storage media |
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