TW201105520A - Method for positioning interactive electronic whiteboard image and system thereof - Google Patents

Abstract

This invention relates to a method for positioning an interactive electronic whiteboard image and a system thereof. A plurality of calibration points are disposed at the edge of a rectangular whiteboard, and two digital image pick-up units are used to capture each calibration point image and a whiteboard image. The calibration point images are inputted to a signal processing unit for pretreatment of the images so as to calculate the coordinate of each calibration point and set up a block parameter database, by which the positioning parameter data can be obtained after entering each calibration point coordinate and the real calibration point coordinates as the basis for whiteboard positioning correction. Then the whiteboard image is inputted into the signal processing unit to carry out image pretreatment and to obtain the pen point coordinate of a whiteboard pen. The pen point coordinate is combined with the block parameter database and substituted in an image positioning algorithm to calculate the real coordinate of the pen point, such that the real coordinate of the pen point can be combined with the display screen of an application program of the signal processing unit.

Description

201105520 VI. Description of the Invention: [Technical Field] The present invention relates to a method for secreting money-filament type electronic self-wire image, and particularly to a method including a whiteboard positioning step, a correction point operation step, an initialization step, and a pen point execution. The trace operation step and the integrated display step '俾 can be used as a combination of one of the actual coordinates of the pen point without the number processing unit. [Prior Art] The key changes in the use of this interactive electronic whiteboard enable two-way interaction and operation between the whiteboard and the computer, and the whiteboard is introduced into the 6-system. The interaction of interactive electronic whiteboards is to improve teaching efficiency, perform various types of learning and provide multiple learning styles and improve the teaching environment. According to Professor Chen Huibang, the use of interactive whiteboards is quite common in the world, with more than 250,000 people in the classroom personal experience' even in sync with famous universities such as Yale and Harvard. Interactive White Calling Board is a system that combines a computer, a single grab projector, and an inductive whiteboard. It completely breaks away from the teaching mode when it is used to operate different interfaces. However, the price is not cheap, and the interactive whiteboard and application software will cost more than 80,000 yuan. The interactive whiteboard is a combination of a whiteboard (hardware) with an inductive device and a software that can be used with a whiteboard. It is a thin computer technology, microelectronics technology and electronic communication technology, and becomes another type of input/output device. In a more intuitive way of operation, the teacher communicates with the electric & the operation of software and hardware functions and teaching resources 'becomes an important human intelligence recording communication platform. ~ 201105520 In 2007, the Ministry of Education and the National Science Council expanded the promotion of "integration of information into teaching i CT leaf paintings", fully subsidized 15 counties and cities, hundreds of small and medium-sized countries, and officially introduced interactive whiteboards. The use of an interactive whiteboard can enhance the fresh efficiency and continue the teaching habits of the teacher while explaining and writing. Let the digital content be presented. The instructor can use the software on the whiteboard: the various applications, the perfect presentation of the importance of the software, and the presentation of various color tools. Students on the whiteboard can choose the color and thickness of the pen at any time, or use the glory pens of different colors to present the numbers and the wealth of the learning crane: if the touch is fresh, you can directly touch the whiteboard or mark on the white board; Type learners discuss through the whiteboard. Visual learners can see changes in whiteboard operations that are appropriate for students of all ages. After the popularity of the electronic whiteboard, the youngest students or the students of the institute are extremely popular and play the most important role. Compared with the classroom of the comprehensive device PC, the electronic white room can let the whole class learn together through the single computer of the electronic white area. The relative cost is lower and the benefit is higher, and the best construction teaching is achieved. With. The easy-to-use features of the electronic whiteboard allow teachers and students to make full use of their imagination and Luchuang = power, teachers and students do not have to endure the chalk ash that flies everywhere. Simple mechanical operation skills can be used to learn to operate. It is easier for students to use the hand-reduced stylus to execute software directly on the whiteboard. The electronic whiteboard is the best teaching aid for interactive teaching. Users can input information on the computer or from the board to provide greater interaction. For example, the teacher is in front of the computer, and the student is at the side of the whiteboard. In the teaching interaction, the student is more likely to propose ideas and conduct teaching activities. The copyboard is the best interface for other peripherals to display photos or videos taken with a digital camera and to highlight the focus at any time. For example, when watching a sports film, the coach can tell the athlete at any time. 201105520 How to behave and how to correct it is the embarrassing scale of the electronic cluster = meeting or classroom - participants can get the most complete The contents of the record: ^Invented the improved financial whiteboard using the shortcomings of four cameras, directly reducing the camera, but also reducing the need for other hardware and software, significantly reducing the cost of the electronic whiteboard, and promoting the National Science Council to complete the information integration teaching 1c Painting, so the invention is very important. The interactive whiteboard in the market is connected with the computer and used to project the projector on the whiteboard with a single grab. 'With the electronic whiteboard side of the software, the electric _ step displays the inner valley of the electronic whiteboard, and the electronic whiteboard has built in digital interaction. The function of simulating the mouse allows online display, storage and export of teaching materials. The teaching computer integrates the single-shot wins, the electronic whiteboard, the student tablet, the wireless Bluetooth tablet, the IRS feedback system, and the axis has a high-quality E-chemical environment. The interactive whiteboard (inte coffee with tronic WhiteBoard, IWB) promotes two-way interaction between the whiteboard and the computer. The content written on the electronic whiteboard can be transferred to a digital file, and the teacher can intuitively operate various application software directly on the electronic whiteboard, and the interaction between the teacher and the student is shown in the figure (on behalf of the generation. Different hardware technologies' current interactive whiteboards can be divided into five major 21, electromagnetic induction, pressure induction, ultrasonic induction, and (10) light. The following is a brief description of the five major technologies: Should be in the electronic white _ around the shirt a red secret device, constitute = scan network, in order to get accurate positioning, using the original mosquito position of the XY axis, with the increase of 2 fasting a 'de precision will also follow the increase, according to the touch Sashimi level 盥 infrared, you can get the dragon _ coordinates and get the positioning message. Because the use of red, 201105520 outside line blocking as a basis for detection, so you do not need to use a special pen to write with your fingers. , 3M, Sahara, Luidia, Hitachi. The conventional structural axis has electronic interactive teaching Wei, but its electronic self-board must be evenly set up with infrared components. Therefore, it must be customized In order to achieve the secret positioning purpose of the whiteboard pen, the production is too low and the production cost is too high. In addition, the large-scale electronic self-board e gradually becomes a trend, and the cost is too high to be competitive. # (2) The aspect of pressure touch sensing is composed of a multi-layer film, which mainly includes the electricity _ horizontal and vertical 峨 _ difficult to conduct fresh, through the contact of conductive _ film contact to locate 'when any type of pen tip or finger touch On the whiteboard, the guide and the resistive film will be thin to produce an electronic signal. The signal contains horizontal (χ axis) and vertical (¥ axis) coordinates, and then the relative position of the signal is transmitted back to the computer. 〇lyvis〇n,

Interactive Tech, Smart. The conventional structure is mixed with the electronic practice of Wei, but it must be evenly placed with the pressure touch sensing component. Therefore, the whiteboard pen must be used to achieve the coordinate positioning purpose of the whiteboard pen. The manufacturing process is complicated and difficult to produce, so that the production cost is too high, and the large-sized electronic whiteboard has gradually become a trend, and it is uncompetitive because of the high cost. (3) The relevant electromagnetic tracking method is based on the whiteboard touching the sensor, each detecting the horizontal and vertical position signals, because the induction coil is passive, it must be! Each device sends a signal. - Generally speaking, the pen should be a pen or an electronic pen. According to Qian Gu and the sensor pen, the signal is exchanged with each other, so that the sensor pen will send a signal. When the sensor pen moves or the book 201105520 is written, the induction coil receives the signal. It will then be positioned and the relative position will be passed back to the computer, but this positioning method requires the use of a specific sensor pen. Which represents the manufacturer

Promethean, GTC0, Numonics. The conventional structure relies on an electronic wire teaching tool. However, the electronic self-board must be uniformly arranged with an electromagnetic induction component. Therefore, it is necessary to use a special customized whiteboard to achieve the coordinate positioning purpose of the whiteboard pen, thereby making the manufacturing process complicated and complicated. It is not easy to produce, so the production cost is too high, and the large-sized electronic whiteboard has gradually become a trend. Lu will be uncompetitive due to the cost of the South. (4) Regarding the ultrasonic sensing, the ultrasonic receiver is placed on the left and right sides of the upper edge of the whiteboard, and the transmission of the signal is through a dedicated transmitter, which is usually presented in the form of a pen, relying on the receiver and the transmitter. The operation between the three points is not the 方 轴 axis of the square heart. a. When the dragon is on the surface of the board, it will be positioned after the time, distance and angle of the = The transmitter is set on the whiteboard; the reason is not necessarily ^ and white, the board is combined, so the written medium is not an electronic whiteboard, and the receiver can be used on any whiteboard if it is not a 'style' job. Next to the downtime, this position also needs to make the sensor pen. Its towel represents the manufacturer (four), 丨 _. Although the conventional structure has an electronic interactive teaching function, the electronic whiteboard must uniformly set the ultrasonic sensing component. Therefore, it is necessary to use a special customized whiteboard to achieve the coordinate positioning purpose of the whiteboard pen, thereby making the manufacturing process more complicated. It is not easy to produce, so that the raw noodles are too high, and the A-size electronic self-board has gradually become a trend, which will be uncompetitive due to high cost. (5) Ik's electronic whiteboard size continues to increase, so that the production cost of the above-mentioned structure is 201105520:::Upper, so as to reduce the competitiveness of the business', so the cost is relatively low-cost and (4) the financial accounting, its threat-like whiteboard four calculation method _2 D touch scales, and the position of the _Wei structure is constrained by the Cong image: the factor limit is such that its image manipulation is smaller. Therefore, the Xibie board H uses the metaphor of (10) and the output white ^峨故(四)彳·娜(四)The promotion of the deletion industry [Invention content] =Di purpose in the miscellaneous supply----------------------------------------------------------------------------------------------------------------------------------------------------------- The positioning algorithm is used to calculate the point coordinates of the pen point of the whiteboard pen. The mouth surface of the whiteboard pen is relatively wide, so the reduction of the number such as = can not only effectively reduce the manufacturing cost and improve the pen point = fruit = The promotion and promotion of _-type electronic whiteboard teaching: to achieve the characteristics of interactive teaching environment or conference briefing. Sighing and reducing her positive, m training county records the various calibration points - whiteboard image, and then the correction point image is input to - signal processing single to make two # $ mark 'and establish - block parameter miscellaneous library, to Two = right point coordinates and the actual correction point chain from the board • ox ox whiteboard bridge is based on the positioning, then input the whiteboard image into the signal processing unit = = before the image can be 剌 妓 妓 _ yarn chain, then __合区201105520 The number of people in the next generation of the library - image positioning algorithm towel, lying on the actual coordinates of the actual coordinates of the bee and the processing unit - should be secretive. [Embodiment] 基本· Basic technical features of the present invention 1. Technical characteristics of the method β Please, as shown in the first to third figures, the main application of the present invention is in an interactive teaching environment or a conference presentation _ The whiteboard (10) with the two-station image = shadow early 70 (10) can be used to image the image of the board (10). The money-sharing algorithm can output the pen-marks left by the whiteboard pen on the whiteboard (10), and then use the projector. (10)) Project the actual coordinates and the application on the computer to the whiteboard (10) to achieve instant interactive teaching or briefing. The technical features of the method of the present invention include the following steps: (a) the whiteboard erecting the image capturing module step, that is, setting up an image capturing module on a whiteboard ,, the image capturing module is composed of two digital images The photographing unit (2〇) is composed of; (b) a whiteboard block parameter database establishing step, wherein the image capturing module cooperates with a signal processing unit (3〇a) to create a block of the whiteboard (1〇) a parameter database, comprising: (bl) setting a plurality of correction points (11) distributed in a matrix on a rectangular writing surface 〇 2) of the whiteboard (1〇); (b2) using the two image capturing units ( 2)) capturing the writing surface (12) image of the whiteboard (1〇); (b3) initializing the writing surface (12) image of the whiteboard (1〇) by the signal processing unit (3〇a) 'Pre-processing the writing surface (12) of the whiteboard (1〇) and correcting the 201105520 correction point (11) to determine its actual position on the whiteboard (10); and (b4) Establishing a plurality of large block parameter databases for the area enclosed by the writing surface (丨2) according to the plurality of correction points (11), and each large block a parameter database comprising a plurality of cell blocks; and (c) a whiteboard pen coordinate processing step, comprising: (cl) continuously capturing the writing surface (12) image of the whiteboard by using the two image capturing units (2〇) (c2) performing image pre-processing on the writing surface (12) of the whiteboard (10) when the signal processing unit (3〇a) determines that the writing surface (I?) has a whiteboard pen; (c3) After the signal processing unit (3〇a) calculates the coordinates of the pen point of the whiteboard pen on the writing surface (12) and compares the coordinates of the pen point with the large and cell block parameter database, Determining that the coordinates of the pen point are located in a block of a large block; (c4) calculating, by the signal processing unit (10) a), the pen point on the writing surface of the whiteboard according to the image positioning algorithm The actual coordinates; and (c5) output the actual coordinate information of the scales by the signal processing unit (10) a). 1.2 Technical Features of the System of the Invention Referring to the first to the second and sixth and tenth views, the present invention is mainly applied to the interactive teaching Wei Qihui _ newspaper _ way, only need her (10) with digital imaging unit (10) You can use the whiteboard, and you can use the bit algorithm to output the whiteboard pen on the whiteboard (10). _Point the actual coordinates, and then project the image of the actual coordinates of the pen point and the Lang program on the whiteboard (10) by using the machine (10). To achieve the above effects, the technical features of this fx ride include: whiteboard (10), two sets of digital image capture units (2〇) 201105520 and a signal processing unit (30a) '俾 can be the actual coordinate and signal processing unit of the pen point (3〇a) A combination of the display of one of the computer applications. Referring to the first to third figures, the whiteboard (10) of the present invention has a rectangular shape, and a plurality of correction points (H) are disposed on the edge of the whiteboard (10), and the whiteboard (10) has a rectangular writing surface (12). And two parallel long sides and two parallel wide sides around the writing surface (12), and a plurality of 杈 点 (11) are arranged in a matrix along the long side and the wide side of the writing surface of the whiteboard. Referring to the second and third figures, the present invention is arranged along the long side of the whiteboard (10) in parallel with the two groups of digital image capturing units (20) 'each digital image capturing unit (10) is responsible for holding the whiteboard G〇) writing surface (12)—Image of a half area. Referring to Figures 2, 2, and 5 and 12 to 12, the signal processing unit (30a) of the present invention mainly uses a correction point image, a whiteboard pen and a whiteboard pen input by the image capturing unit (10).

The whiteboard image is used for image pre-processing to obtain the coordinates of the coordinates of the calibration point and the whiteboard pen, and in the signal processing unit (10) a) _ 潍 processing the tilt and large, cell block parameter database, the image processing software has the implementation of the mosquito bit Algorithm and image pre-processing work ^, contribution, Xiaolai parameters (four) library can be adjusted for each difficulty and the actual correction point = get the whiteboard (10) miscellaneous points to return, and can be used as a whiteboard (10) and whiteboard Lightly read the basis of the correction, and then compare the pen point coordinates with the block parameter database 1:2: In the different method, the actual coordinates of the pen point are calculated. According to this, the pen point 2 private and signal processing unit (30a) can be made. ) or a combination of the display of a computer application. DETAILED DESCRIPTION OF THE INVENTION 2.1 Digital Image Capturing Unit 201105520 Adopted by the Invention Referring to Figures 1-3, the digital image capturing unit (10) of the present invention may be a digital camera (such as CCD or CMOS) or a network. For digital cameras, the present invention requires only one image capture device for a small whiteboard (9〇cm*9〇Cm), and only two digital imaging units for a large white version (88-176) (10) , you can complete the high-precision whiteboard pen positioning. For the specific side towel of this type, for the whiteboard (10) with the length of the service width of 88αη, the number of digital image capturing units (10) only needs two groups, and the digital image f photography unit (10) is parallel along the white (four) 〇) Juxtaposition, the county - touched the shadow of the shadow of the morning 7 〇 (20) is responsible for the half of the image of the writing surface (10) of the whiteboard (10). Wherein, the two-digit image capturing element (10) is fixed in a specific manner, and the positioning device (50) comprises two inverted (10) rods (5)), and one end of the rod body (5) is fixed by a fixing means.疋On the whiteboard (10), the other side is to use another fixed means to set the digital image capturing unit (20). The input image 2 (10) is placed on both sides of the coffee table (10) and is separated from the whiteboard (10). The plane of the extension is at the position of -. < 2. 2 The signal processing unit used in the present invention, as shown in the third figure, in a specific embodiment of the present invention, the signal processing unit (10) a) can be - computer (10) 'the computer (10) has an image processing software built in The big and the block parameters of the cell block library's secret processing software have the function of performing image positioning algorithm and image pre-processing. The shirt image processing software can perform the image pre-processing work of the correction point image, the whiteboard image, and the pen point of the whiteboard pen, and can calculate the coordinate point of the calibration point coordinate and the whiteboard pen. In addition, the display surface of the riding computer (3Q) The pen point coordinates are superimposed, and the image processing software further includes an image superimposition program that combines the actual coordinates of the pen point with the display screen of the computer application. 12 201105520 Please refer to the process shown in Figures 3 and 4.

The image processing software of the signal processing unit (3Qa) continuously reads the whiteboard image and touches whether the whiteboard image is generated, I, and then reads the whiteboard image; when there is the whiteboard pen image, the image is processed before: The pen point of the whiteboard pen. Please refer to the seventh and thirteenth pictures _ H side, establish the general management unit image processing software to convert the correction point image from RGB format to YIQ plane, and then obtain the image of the correction point from the YIQ plane, and then make the YIQ level value. Remove the image from the department to retain the school | punctual image 'After the small area noise butterfly to remove the small area of the calibration point image, and obtain the re-recording of the correction point image, _ can be called 丨 correction point coordinates Outputting 'where the Q-plane is processed in a gray-binary manner to obtain a correction point image. The image localization algorithm in the above specific embodiment is a fast-fixing Bi-linear Interpolation Psition Location (FMBI) positioning program, and the image is transmitted by the self-secret image transmitted by the chip (10). Clamping operation. And the image localization algorithm is based on the gifted interpolation (four) bilinear interpolation method and the proportional-proportional method for calculation, and the actual point coordinates of the whiteboard pen can be obtained. 2.3 For the signal transmission unit used in the present invention, please refer to the second and third figures. In order to transfer the image captured by the digital image capturing unit (10) to the signal processing unit (10), the creation includes "Xinlin Xianyuan (3) ), for transmitting the correction point and the whiteboard image touched by the digital reading unit (20) to the shirt image processing unit, in the specific embodiment, the subtracting unit ((1) may be wireless communication Module (31〇) (as shown in the third figure), or signal line group (311) (as shown in the second figure) 201105520 参. Operation principle of the invention 3.1 Establishment of the whiteboard block parameter database of the present invention Steps of the whiteboard block parameter database establishing step of the present invention are as shown in the third to sixth figures. First, a plurality of correction points (11) distributed in a matrix are set on the writing surface (12) of the whiteboard (10) to provide image processing software. The program initializes the whiteboard (10) for positioning correction, and mounts the digital image capturing unit (10) at a position of 88 cm from the upper edge of the upper edge of the whiteboard (1 inch) and a distance of 50 cm from the plane on which the whiteboard (10) extends upwards. Photography unit (2〇) For the sake of installation, the accuracy of the position of the digital camera unit (20) and the whiteboard (1〇) will be closely related to the accuracy of the position marker of the whiteboard pen. Therefore, it is necessary to perform initial positioning correction of the whiteboard and correct the point ( The whiteboard (10) can be used to mark the shed. If the relative position of the image element (10) and the whiteboard (10) is correctly positioned, the image positioning algorithm can be used to detect the calculation result more accurately. In the five figures, the whiteboard calibration point is set on the whiteboard, and the whiteboard image is captured by the digital image unit (10), and the image is pre-processed, and then the block parameter data is established by a positioning algorithm and recorded in Block parameter dumping. In order to make the block parameters more precise, it divides the writing surface of the whiteboard into a large block of a plurality of matrix distributions (such as the ninth, phase shown in the 'nth figure is before the correction' tenth map After the correction, a large block parameter poor database is established, and the large block is further divided into a plurality of matrix distributed cell blocks, and a block parameter database is established (as shown in the eleventh and twelfth figures). , the first One picture is before correction, the twelfth picture is after correction). When the initialization of the whiteboard (10) positioning bridge is completed, the required positioning parameter data has been recorded, so the whiteboard is not needed (10) Calibration point (1)) 201105520 The correction point coordinates provided by Wei, _, and the correction point (U) on the whiteboard (10) are removed as shown in the seventh figure. The image pre-processing step =: B format is converted to the YIQ plane. 'More by (10) Ping_正:: Point 2 Please side 1 value, take the image of the big object, the image of the tender point, hoard the __ face _ correction _, and get the correction ^ image of the center of gravity 'and then things The point coordinates are corrected and output. Wherein, ^ 1 ^ binarization is processed to obtain the correction point image; if the attachment is not tied to the gray point, the correction point is found after the value is digitized; {after. Calculating the whiteboard pen positive _ x _ k 崎The image is easy to be used. 3. 2 The whiteboard pen coordinate processing step of the present invention ☆: Referring to the second, fourth, and human to twelf diagrams, the white wire coordinate processing step of the present invention is performed in the 'city processing unit (10). Will be independent _ from the board image and ^ break 疋 no whiteboard pen image generation, no whiteboard pen image, ugly to take the whiteboard image. When the stencil pen draws on the whiteboard and forms a trajectory, the digital image capturing unit (10) captures the whiteboard image' and obtains the center of gravity coordinates of the whiteboard pen point through the image pre-processing operation, and filters out the small area noise. After the noise, you can get the pen point coordinates of the current whiteboard pen. Then compare and correct the pen point coordinates with the data in the block parameter database, and then substitute it into the image localization algorithm towel, so that the actual coordinates can be accurately determined. Among them, the front of the image is given as the seventh ride. Furthermore, 3.3 the algorithm of the present invention YIQ 疋 NTSC (National Television Standards Committee) electricity 15 201105520 Vision system standard. γ is a luminance signal (Luminance) for black and white televisions and color televisions, that is, brightness (I) represents In-phase, color from orange to cyan, q represents Quadrature-phase, and color ranges from purple to yellow-green. Since it is easier to process image operations efficiently in the YIQ plane than in the RGB plane, we choose to operate in the YIQ plane. The formula for the conversion and inverse conversion between the YIQ plane and the RGB plane is as follows.

R,G,B,Y €[0,1\, /€[-0.5957,0.5957], Q € [-0.5226,0.52261 "νΐ Γ λ οηη λ ίτΛ-τ Λ ... -ι ι- 1 V 0.299 0.587 0.114 I = 0.595716 -0.274453 -0.321263 9. 0.211456 -0.522591 0.311135 'R 1 0.9563 0.6210 ' G 1 -0.2721 -0.6474 I Β 1 -1.1070 +1.7046 Q Please refer to Figures 5 to 7. Image positioning used in the present invention When the algorithm is installed in the digital image capturing unit (10), the position of the digital image capturing unit (10) and the whiteboard (10) are all variable, so the whiteboard (10) needs to be initialized. The positioning bridge is positive, so that the relative position of the digital image capturing unit (10) and the whiteboard (10) can be positioned positively, which can make the result of the subsequent korean algorithm more correct. The fifth figure is a flow chart for initializing the whiteboard positioning correction. The writing surface 2 of the whiteboard (1〇) is placed in a plurality of correction points (11) distributed in a matrix, and then the digital image capturing unit (2〇) is combined. The whiteboard image of the correction point (1) is taken out after the image pre-processing and the new positive point (1), and then the operation is performed via the initial positioning algorithm to record the parameters to provide the positioning algorithm. The positioning algorithm used in the present invention is used. Referring to the first figure and the ninth to eleventh figures, in the present invention, after the initial whiteboard (1〇) is updated, the 'professional point (1) is removed, and the touch-through unit (10) continues to obtain the 201105520 image. After the image pre-processing and de-noising processing, the image can be input into the image localization algorithm. The 'image' algorithm uses bilinear interpolation, which is an extension of linear interpolation. And with the application of the proportional method. 3·4· 1 Bilinear Interpolation of Positioning Algorithms of the Invention In June, as shown in the thirteenth and fourteenth figures, bilinear interpolation, also known as bilinear interpolation. Mathematically, bilinear interpolation is a linear interpolation extension of an interpolation function with two variables. The core idea is to perform linear interpolation in two directions. Suppose we want to get the value of the unknown function f at point p = (X, y), suppose we know that the function f is in Q11 = (xl, yl), Q12 = (xl, y2), Q21 = (x2, yl) and Q22 =(x2,y2) The value of the four points. First, linear interpolation is performed in the X-axis direction (the length of the whiteboard) to obtain f(Ri)m2) 丨2 — a: where—A X2 - A X7~x — ^ x~xt f(Qn) + X2 _ ~/( Q2i) where R\=(x,yi), x2 ~ x1 -^^12) + (Q22) where R2-(x, y2). Then linearly interpolate in the y-axis direction (whiteboard width direction), π r> \ ^ V2 — v .. „ _ This gives the desired result f(x, y), f(x, y) - /(Q11) t( v 1) + ) (Bu ^ K choose (5) sit; ^ The system makes the four known point coordinates of f respectively or is represented by matrix operation as w 1)+/(ΜΚ1-咖+/(1 plus 201105520 ;i [/(〇,〇) /(ο,υίΓι-^ι The name of the inverse interpolation method is not 'this method of input is not linear, its form is (αχχ =|= a2)(a^y + a4), which is the product of two linear functions. In addition, interpolation It can also be expressed as lh+b^+l^y + b4xy· In both cases, the number of constants corresponds to the number of data points of the difference f. The result of linear interpolation is independent of the order of interpolation. Interpolation of the direction, and then interpolation in the X-axis direction, the result is the same. 3· 4· 2 positioning of the invention For the proportional method of the algorithm, please refer to the fourteenth figure. 'In mathematics, if the relationship between the two quantities is in accordance with one - the quantity is another - the quantity is multiplied by a constant, or the equivalent axis is both - For the ratio of constants, the two are said to be proportional. More formally, if there is a non-zero constant k such that y = kxx, the Robe nickname variable y is proportional to the variable x (sometimes called proportional) The relationship is usually expressed as: ^ocx, and the constant ratio is called

k = y / X is the proportional constant in the proportional constant or proportional relationship. because

Equivalent to 201105520 x==(y^) X y,

Therefore, it can be derived that if y 盥 and the ancient μ A / / have a proportional relationship of ten, k, x also has a proportional relationship with y proportional constant 1 / k. y...proportional' then the function image of y as a function of x would be a straight line passing through the original off-the scale of the scale to its proportional constant.肆. Conclusion Therefore, 'by the above-mentioned structure setting, the present invention uses the optical scanning method to take the whiteboard image' plus the image pre-processing and image localization method to calculate the pen point coordinates of the whiteboard pen, so the number (4) The secrets of the materials that can be tendered are more extensive, so it is possible to reduce the number of materials (4), which not only can effectively reduce the manufacturing cost, but also call the purpose of the electronic whiteboard teaching conference briefing. To achieve an interactive teaching environment or

= The above-mentioned 'County (4)-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Special fiber _. The invention is defined in the request of the slave knot, the article is not found, and has a tactile touch: = conforms to the invention and the piece, the sharp law is privately corrected (4), and the lining is legally patented to protect the legality of the applicant. rights and interests. BRIEF DESCRIPTION OF THE DRAWINGS The first figure is an exploded view of a part of the structure of the present invention. The second figure is a schematic diagram of the implementation of the present invention in combination with a computer and a projector. 201105520 The third figure is a schematic diagram of another embodiment of the present invention combined with a computer and a projector. The fourth figure is a schematic diagram of the overall process of the present invention. The fifth figure is a schematic diagram of the initialization process of the whiteboard of the present invention. The sixth figure is a schematic diagram of the output process of the positioning parameter of the present invention. The seventh figure is a schematic diagram of the image pre-processing flow of the present invention. The eighth figure is a schematic diagram of the coordinates and output flow of the whiteboard pen of the present invention. The ninth figure is a schematic diagram of the image taking of the large block of the present invention. The tenth figure is a schematic diagram of the actual state of the large block parameters of the present invention. The eleventh figure is a schematic diagram of the image acquisition of the cell block of the present invention. The twelfth figure is a schematic diagram of the actual state of the cell block parameters of the present invention. The thirteenth diagram is a schematic diagram of the bilinear interpolation method of the present invention. Figure 14 is a schematic illustration of the proportional method of the present invention. Attachment: It is an image diagram of the grayscale diagram of the present invention after binarization. [Description of main component symbols] _ (10) Whiteboard (11) Writing surface (12) Right point (13) Whiteboard pen (20) Digital image capturing unit (30) Computer (30a) Signal processing unit (31) Signal transmission unit ( 310) wireless communication module (311) signal line group (40) projector (50) positioning device (51) rod body 20

Claims (1)

201105520 VII's patent application scope: 1. An interactive whiteboard image positioning method, comprising: a whiteboard erecting an image capturing module step, that is, setting up an image capturing module on a whiteboard, the image capturing module is composed of two a digital image capturing unit is formed; the whiteboard block is configured to record the library, and (10) the video is converted into a signal processing unit to create a block parameter database of the whiteboard, which includes: a rectangle of the whiteboard a plurality of correction points distributed in a matrix are arranged on the writing surface; the writing surface image of the whiteboard is captured by the two imaging elements; and the #writing surface image of the correction age board is initialized by the signal processing unit, and the whiteboard is The writing image is pre-processed, and the correction point is corrected to determine its actual position on the whiteboard; and the plurality of large blocks are created according to the plurality of correction points for the area enclosed by the writing surface. The data block and the large block include a parameter database of a plurality of cell blocks and a whiteboard pen coordinate processing step, which includes: continuously practicing the whiteboard by the two image capturing units Writing surface image; The upper_signal processing unit performs image pre-processing on the 5H writing surface image of the whiteboard when judging that there is a whiteboard pen on the writing surface; ^峨(四)纟咖自__靖(四) coordinates, two points The coordinates are compared with the large and cell block parameter database, and a block of the pen point is determined to be located in a large block of the pen point; the positioning algorithm calculates that the pen point is processed by the signal The unit is based on the actual coordinates of the writing surface of the shadow whiteboard; and 201105520 outputs the actual coordinate information of the pen point by the signal processing unit. The method for positioning an interactive whiteboard image according to the above item, wherein the writing surface of the whiteboard has a rectangular shape and has two parallel long sides and two parallel wide sides, and the plurality of positive points are distributed in a matrix. The writing surface area is separated by a plurality of _, and the two-position image capturing unit of the image capturing module is disposed in parallel with the long side to respectively capture an image of the writing surface of the half portion. 3. The method for positioning an interactive whiteboard image according to claim 2, wherein the (four) face of the whiteboard has a length difference of 176em and the width of the wide side is at least 88cm. The unit is divided and placed on the whiteboard, and is located at a position extending from the top of the whiteboard to the 88em and extending to the front of the whiteboard. 4. The image positioning method of the silk-type electronic whiteboard according to the first item of the request item, wherein the whiteboard block parameter depends on the hometown processing of the light step, and the image is converted to the HQ plane by the various formulas, and then The image of the calibration point is obtained in the plane, and then the thank-you surface is turned over, and most of the impurities are removed. (4) The correction sound is fined, and the area is filtered to remove the small surface _ miscellaneous points, and the Wei correction butterfly is taken. The position of the center of gravity is calculated, and then the coordinate of the correction point is calculated and then rotated. 5. As shown in item 4 of the request, the interactive money is loosely positioned from the board image, wherein the YIQ plane is related to the method of processing the plane to correct the image. 6. The interactive electronic self-board image definition method described in item 请求 of the request item, wherein after completing the establishment of the whiteboard block parameter database, the various positive points on the _ whiteboard are given 22 201105520 7. The interactive whiteboard image described in item 1 locates the actual coordinate of the pen point to the computer, and combines the actual coordinate with the display frame of the program, and the stylus _ coordinate constitutes the obstruction face. The method, wherein one of the applications of the computer is displayed on the display. 8. The interactive electronic self-board method according to the item of claim 3, the signal processing unit reads the image of the slab and touches the slab Pen^ Raw 'none, ugly read the whiteboard image; 彳, then perform the image pre-processing to ^^ the pen point coordinates of the whiteboard pen. Different from the 5th 9. The image positioning method of the silk-type electronic whiteboard described in Item 1 of the claim item is used to find the actual coordinates of the pen point. 10. An interactive whiteboard image setting (four) system, which includes a whiteboard of a rectangular shape. When the whiteboard block parameter database is established, the rectangular writing surface is provided with a plurality of matrix distributions. Correction point plate 箸 coordinate treatment just, butterfly cans - from the can _ 贞 touch, 郷 转 _ two health position scale unit unit group 'red digital image photography unit relative to the whiteboard of the writing _—long side parallel and ' The mother-photographing unit is responsible for capturing the image of the writing surface-half area, and when the step 7 is used to establish the parameters of the parameter database, (4) the suspect position is on the writing surface. ίν is like performing the whiteboard stylus The processing step is to extract the pen point image of the whiteboard pen located on the surface of the book; and the billion processing unit for capturing the image obtained by the image capturing module, 23 201105520 2 Obtaining the coordinates of the calibration point and the coordinates of the pen point of the pen before the image of the calibration point and the image of the whiteboard are used to perform the step of establishing the parameter database of the whiteboard block, and simply screaming the Weiwei area according to the correction point The returning library rides a small number of small a parameter database of the block, in which the point coordinates of the whiteboard pen are combined with the block parameter database to compare the in-image-in-image positioning algorithm, and the actual coordinates of the pen point on the (four) face of the whiteboard are calculated. The information outputs the actual coordinate information of the pen point. • 1L. The interactive whiteboard image positioning system according to claim 10, wherein the v digital video unit is one of the digital camera and the network number butterfly. 12. The interactive electronic whiteboard image positioning system further includes: the signal transmission unit ribs the recorded image capturing unit _ the respective correction point images and the whiteboard image are transmitted to the signal processing unit. The interactive electronic whiteboard image positioning system of claim 12, wherein the signal processing unit is a computer. 14. The interactive whiteboard shadow mosquito Wei as described in item 1G of the claim, which is further connected to the 峨 processing unit, transmits the actual signal of the pen point to the computer, and The actual coordinates are combined with the computer's application surface, and the track formed by the coordinates of the pen point is displayed on the display screen. 15. The interactive whiteboard image positioning system according to Item 1 of the present invention, wherein the rectangular writing surface of the whiteboard has a long side length of at least 176 (10) and a wide side length of at least ^ 'the two-digit image capturing element Gu-positioning device mosquitoes on the whiteboard, 24 201105520; from the (3) writing surface, the long side of the writing surface extends 88 cm and extends 50 cm to the front of the whiteboard. 16. For example, in the request item 筮^, the interactive whiteboard image positioning system described in 1 item, the example method is carried out—the ten-liter money is extended by the bilinear interpolation method and matched with the order material. In order to (4) the actual coordinates of the pen point. 25