JP2008287540A - Handwriting reproducing-plotting method, handwriting reproducing-plotting device, and program used for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a handwriting reproducing-plotting method for accurately reproducing handwriting in straight lines based on a plurality of coordinate points having an age-based sequence corresponding to handwriting. <P>SOLUTION: With respect to a plurality of coordinate points t(0), t(1), t(2), t(3), ..., t(k), etc., t(0) is set as a reference point to compute a distance d(k-2) from t(k-1) to a straight line c(k-2) connecting t(0) to t(k). All of each distance between coordinate points from t(0) to t(k) are compared with a first threshold Dex. When all the distances between the coordinate points are the threshold Dex or more, the distance d(k-2) is compared with a second threshold dc. When the distance less than the first threshold Dex exists among the respective distances between the coordinate points, the distance d(k-2) is compared with a third threshold de shorter than the second threshold dc. When the distance d(k-2) is the threshold or more, plotting is performed in a straight line between t(0) and t(k-1), and t(k-1) is reallocated from the reference coordinate point t(0) to repeat the first step onward. Meanwhile when the distance d(k-2) is less than the threshold, k is increased to repeat from the first step. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a drawing processing technique for reproducing handwriting described with an electronic pen or the like.

  In recent years, pen-type input devices called “electronic pens” and “digital pens” have appeared (hereinafter referred to as “electronic pens” in this specification). The developed “Anoto pen” is known (see Patent Document 1). Anotopen is used together with dedicated paper (hereinafter also referred to as “dedicated paper”) on which a predetermined dot pattern is printed. In addition to the normal ink-type pen tip, the Anoto pen is equipped with a small camera for reading the dot pattern on the dedicated paper and a data communication unit. When a user writes characters on the special paper with an annotation pen, or puts a check mark on the image designed on the special paper, the small camera displays the dot pattern printed on the special paper as the pen moves. Entry information such as characters and images detected and written by the user is acquired. This entry information is transmitted from the Anotopen by the data communication unit to a terminal device such as a nearby personal computer or mobile phone. The system using this anotopen can be used as an input device in place of the keyboard, and is very easy to use for users who are reluctant to use the personal computer and keyboard described above. Therefore, as a method for digitizing data entered in various business documents, application forms, contracts, etc., a system using an electronic pen is becoming widespread (for example, Patent Document 2).

  Moreover, the proposal which extracts a linear component from the line figure which consists of a some line segment is made | formed (patent documents 3-5). The method of extracting the straight line component proposed in Patent Document 3 is, for example, when the line segments V1, V2 are drawn between the coordinate points P1, P2, P3, and the coordinate point P2, the coordinate point P1, and The distance t with the line segment connected with P2 is obtained, and when the distance t is equal to or less than the predetermined threshold T, the line segments V1 and V2 are replaced with the line segments connected with the coordinate points P1 and P3, and the distance t Is greater than the predetermined threshold value T, the straight line component is extracted by a method of adopting the line segments V1 and V2 as they are.

  The straight line extraction method proposed in Patent Document 4 is an improvement of the straight line extraction method proposed in Patent Document 3, and the line segment is approximated to a polygonal line in order to prevent erroneous integration of the line segments at the intersection of the line segments. In addition, it has been proposed that an adjacent vector whose angle and line width between the target vector and the adjacent vector are equal to or less than a threshold value is determined as a candidate vector having the same straight line as the target vector. Further, in Patent Document 5, with respect to a straight line vector connected in a broken line shape, the bending angle at the connecting portion of adjacent vectors is compared with a reference angle, and when the bending angle is small, both vectors are omitted from the connecting portion. There has been proposed a method of connecting both ends of a line vector with a straight line vector.

Japanese translation of PCT publication No. 2003-511761 JP 2004-153612 A JP-A-1-269185 JP-A-4-4479 JP-A-8-69525

  A straight line extraction method using a fixed threshold as previously proposed is performed in the order of tt (0), tt (1),..., Tt (6),. A problem when applying to a plurality of coordinate points having a temporal order according to handwriting will be described with reference to a drawing example.

  As shown in FIG. 15, a data string of coordinate points tt (0), tt (1), ..., tt (6), ... is converted into coordinate points t (0), t (1), ..., t (6), ..., a straight line is drawn from coordinate point t (0) to t (2), the straight line is c (0), and the distance between straight line c (0) and coordinate point t (1) is d (0 ). If the distance d (0) is equal to or less than the threshold value, then a straight line c (1) is drawn from the coordinate point t (0) to t (3). Then, the distance d (1) between the straight line c (1) and the coordinate point t (2) is obtained, and if the distance d (1) is equal to or less than the threshold value, the coordinate point t (0) to t (4) Draw a straight line c (2) to If the distance d (2) between the straight line c (2) and the coordinate point t (3) is obtained, and the distance d (2) is also less than or equal to the threshold, the straight line c from the coordinate point t (0) to t (5) Draw (3). If the distance d (3) between the straight line c (3) and the coordinate point t (4) exceeds the threshold value, the coordinate points t (0) and t (4) are drawn with straight lines.

  FIG. 16 is a diagram showing a state in which the coordinate points t (0) and t (4) in FIG. 15 are drawn with straight lines, and the coordinate points after the coordinate point t (4) are renumbered from t (0). It is. Also in FIG. 16, processing similar to that for the coordinate point t (0) is performed. That is, a straight line c (0) is drawn from the coordinate point t (0) in FIG. 16 to t (2) to obtain a distance d (0) between the straight line c (0) and the coordinate point t (1). If the distance d (0) exceeds the threshold value, a straight line is drawn from the coordinate point t (0) to t (1) as shown in FIG.

  Then, as can be seen from FIG. 17, the distance between the straight line c (k-2) connected by the reference coordinate point t (0) and a certain coordinate point t (k) and the coordinate point t (k-1) is expressed as follows. If it is determined that the coordinate points are drawn in a straight line as compared with a fixed threshold value, the coordinate points arranged in a curved line cannot be reproduced, and there is a risk of rough linear approximation. However, if the threshold value is reduced, almost all coordinate points are adopted for straight line drawing, and the significance of straight line approximation is reduced.

  Therefore, the present invention selects a part of coordinate points from a plurality of coordinate points having a temporal order according to the handwriting, and reproduces the handwriting with a straight line with high accuracy, a handwriting reproduction drawing apparatus, and a handwriting reproduction drawing apparatus The purpose is to provide a program.

  The handwriting reproduction drawing method according to the present invention includes a plurality of coordinate points t (0), t (1), t (2), t (3),..., T (k) having a temporal order corresponding to the handwriting. A handwriting reproduction drawing method for selecting a part of coordinate points from, ... and reproducing the handwriting with a plurality of straight lines, with the coordinate point t (0) as a reference point and the coordinate point t (k-1) The first step of calculating the distance d (k-2) from the coordinate point t (0) and t (k) to the straight line c (k-2), and the coordinate point t (0) to the coordinate point t a second step for determining whether or not all the distances between the coordinate points up to (k) are greater than or equal to the first threshold Dex, and the coordinate point t (0) to the coordinate point t (k) in the second step. If all the distances between the coordinate points up to are not less than the first threshold Dex, the distance d (k−2) calculated in the first step is compared with the second threshold dc, and the second step There is a distance between each coordinate point from coordinate point t (0) to coordinate point t (k) that is less than the first threshold Dex. If present, the third step of comparing the distance d (k−2) calculated in the first step with the third threshold de shorter than the second threshold dc, and the distance d ( If the distance d (k-2) is greater than or equal to the second threshold dc or the third threshold de as a result of comparing k-2) with the second threshold dc or the third threshold de, the coordinate point t Draws a straight line between (0) and coordinate point t (k-1), and coordinates after coordinate point t (k-1) with coordinate point t (k-1) as reference coordinate point t (0) The point is reassigned as coordinate point t (0), t (1), t (2), t (3), ..., t (k), ..., and the process moves to each step after the first step, while the distance and d (k−2) is less than the second threshold value dc or the third threshold value de, and includes a fourth step that increments k and shifts to each step after the first step. To do.

  According to this handwriting reproduction drawing method, depending on whether or not all the distances between the coordinate points from the coordinate point t (0) to the coordinate point t (k) are equal to or greater than the first threshold Dex, the coordinate point t ( The threshold value to be compared with the distance d (k-2) from k-1) to the straight line c (k-2) connected by the coordinate points t (0) and t (k) is different. That is, when all the coordinate point distances from the coordinate point t (0) to the coordinate point t (k) are equal to or greater than the first threshold Dex, the distance d (k-2) and the second threshold Compared with dc, if there is a value less than the first threshold value Dex, the distance d (k−2) is compared with the third threshold value de shorter than the second threshold value dc. When the distance d (k−2) is equal to or greater than the second threshold dc or the third threshold de, the coordinates for connecting the coordinate point t (0) and the coordinate point t (k) with a straight line Since it is too far from the point t (k-1) and cannot be tolerated, it is between the coordinate point t (k-1) and the coordinate point t (0) immediately before the coordinate point t (k). Is drawn with a straight line. At this time, the coordinate point t (k-1) is the reference coordinate point t (0), and the coordinate points after the coordinate point t (k-1) are coordinate points t (0), t (1), t (2 ), T (3),..., T (k),..., And the process moves to each step after the first step, so that straight line drawing is continuously repeated. On the other hand, if the distance d (k−2) is less than the second threshold value dc or the third threshold value de, the coordinate point t is incremented by incrementing k and moving to each step after the first step. The suitability of line drawing at the next coordinate point t (k) and coordinate point t (0) is determined in time series of (k-1). Thus, when all the distances between the coordinate points from the coordinate point t (0) to the coordinate point t (k) are not less than the first threshold Dex, the distance d (k-2) and the second If there is a threshold value dc less than the first threshold value Dex, the distance d (k−2) is compared with a third threshold value de that is shorter than the second threshold value dc. The handwriting can be accurately reproduced.

  In such a handwriting reproduction drawing method, it is preferable to perform the first to fourth steps by setting the initial value of k to 2. If the initial value of k is 2, the first coordinate points t (0), t (1), and t (2) are processed by the first to fourth steps from the first three coordinate points t (0), t (1), and t (2). It is determined from the suitability of line drawing with (1).

  The handwriting reproduction drawing apparatus according to the present invention includes a plurality of coordinate points t (0), t (1), t (2), t (3),. , ..., a handwriting reproduction drawing device that selects a part of the coordinate points and reproduces the handwriting with a plurality of straight lines, using the coordinate point t (0) as a reference point, and from the coordinate point t (k-1), Perpendicular length calculation means for calculating a distance d (k-2) to a straight line c (k-2) connected by coordinate points t (0) and t (k), and coordinate point t (0) to coordinate point t (0) The coordinate point t (0) is determined by the coordinate point distance determination means for determining whether or not all the distances between the coordinate points up to k) are equal to or greater than the first threshold Dex and the distance determination means between the coordinate points. If it is determined that all the distances between the coordinate points from the coordinate point t (k) to the coordinate point t (k) are greater than or equal to the first threshold Dex, the distance d (k−2) calculated by the perpendicular length calculation means A first comparison determination unit that compares the second threshold dc with the second threshold value dc, and a distance determination unit between the coordinate points. When it is determined that there is a distance between the coordinate points t (0) to the coordinate point t (k) that is less than the first threshold Dex, the perpendicular length calculation means The second comparison / determination unit that compares the calculated distance d (k−2) and the third threshold de that is shorter than the second threshold dc, and the first or second comparison / determination unit As a result of comparing (k-2) with the second threshold dc or the third threshold de, it is determined that the distance d (k-2) is greater than or equal to the second threshold dc or the third threshold de. In this case, a straight line is drawn between the coordinate point t (0) and the coordinate point t (k-1), and the coordinate point t (k-1) is used as the reference coordinate point t (0). k-1) and subsequent coordinate points are reassigned to coordinate points t (0), t (1), t (2), t (3), ..., t (k), ... and processed by the perpendicular length calculation means On the other hand, the distance d (k−2) is less than the second threshold dc or the third threshold de by the first or second comparison / determination means. If it is determined that increments the k, characterized in that it comprises a drawing control means for causing the process to the perpendicular line length calculating means.

  According to the handwriting reproduction drawing apparatus, the coordinate point t (() depends on whether or not all the distances between the coordinate points from the coordinate point t (0) to the coordinate point t (k) are not less than the first threshold Dex. The threshold value to be compared with the distance d (k-2) from k-1) to the straight line c (k-2) connected by the coordinate points t (0) and t (k) is different. That is, when it is determined by the coordinate point distance determination means that all the coordinate point distances from the coordinate point t (0) to the coordinate point t (k) are equal to or greater than the first threshold Dex, The distance d (k−2) calculated by the perpendicular length calculation means and the second threshold value dc are compared by the first comparison / determination means, and if there is a distance less than the first threshold Dex, the distance d (k-2) and a third threshold de shorter than the second threshold dc are compared by the second comparison / determination means. When the distance d (k−2) is equal to or greater than the second threshold dc or the third threshold de, the coordinates for connecting the coordinate point t (0) and the coordinate point t (k) with a straight line Since it is too far from the point t (k-1) and cannot be tolerated, the drawing control means chronologically precedes the coordinate point t (k-1) and the coordinate point t ( Draw a straight line between (0). At this time, the drawing control means uses the coordinate point t (k-1) as the reference coordinate point t (0), and coordinates points t (k-1) and subsequent coordinate points t (0), t (1 ), T (2), t (3),..., T (k),..., And the vertical line length calculation means performs the processing, so that the same drawing processing is repeated continuously. On the other hand, when it is determined that the distance d (k−2) is less than the second threshold value dc or the third threshold value de, the drawing control unit increments k and processes it to the perpendicular length calculation unit. In order to perform the above, the same drawing process is continuously repeated. Thus, when all the distances between the coordinate points from the coordinate point t (0) to the coordinate point t (k) are not less than the first threshold Dex, the distance d (k-2) and the second If there is a threshold value dc less than the first threshold value Dex, the distance d (k−2) is compared with a third threshold value de that is shorter than the second threshold value dc. The handwriting can be accurately reproduced.

  Such a handwriting reproduction drawing apparatus may further include initial value setting means for setting the initial value of k to 2. If the initial value of k is 2, drawing processing is performed from the first three coordinate points t (0), t (1), and t (2), and the coordinate points t (0), t (1), It is determined from the suitability of line drawing during the interval.

  The handwriting reproduction drawing apparatus further includes display means for displaying a drawing, and the drawing control means each time the display is drawn with a straight line between the coordinate point t (0) and the coordinate point t (k-1). It is preferable to have a configuration in which the means draws. With this configuration, it is possible to quickly perform straight line drawing by the display unit according to a time-dependent order corresponding to the handwriting.

  The program according to the present invention includes a plurality of coordinate points t (0), t (1), t (2), t (3),. A program executed by a handwriting reproduction drawing device that selects a part of coordinate points from ... and reproduces the handwriting with a plurality of straight lines, with the coordinate point t (0) as the reference point and the coordinate point t (k- A perpendicular length calculation means for calculating a distance d (k-2) from 1) to a straight line c (k-2) connected by coordinate points t (0) and t (k), coordinates from coordinate point t (0) A coordinate point t (k) is determined by the coordinate point distance determination means for determining whether or not all the distances between the coordinate points up to the point t (k) are equal to or greater than the first threshold Dex. If it is determined that all the distances between the coordinate points from 0) to the coordinate point t (k) are greater than or equal to the first threshold Dex, the distance d (k− 1st comparison judgment means which compares 2) and 2nd threshold value dc, the said coordinate If it is determined by the point distance determination means that there is a distance between the coordinate points t (0) to the coordinate point t (k) that is less than the first threshold Dex, the perpendicular line A second comparison / determination unit that compares the distance d (k−2) calculated by the length calculation unit with a third threshold de that is shorter than the second threshold dc, and the first or second comparison / determination unit. When the distance d (k−2) is compared with the second threshold dc or the third threshold de, the distance d (k−2) is greater than or equal to the second threshold dc or the third threshold de. If determined, draw a straight line between the coordinate point t (0) and the coordinate point t (k-1), and use the coordinate point t (k-1) as the reference coordinate point t (0). Revert the coordinate points after point t (k-1) to coordinate points t (0), t (1), t (2), t (3), ..., t (k), ... On the other hand, the distance d (k−2) is set to the second threshold dc or the third by the first or second comparison / determination unit. When it is determined that the value is less than the threshold de, the computer is caused to function as a handwriting reproduction drawing apparatus including drawing control means for incrementing k and causing the perpendicular length calculation means to perform processing.

  With this program, it is possible to cause a computer to function as a handwriting reproduction drawing apparatus according to the present invention.

  According to the present invention, it is possible to select a part of coordinate points from a plurality of coordinate points having a chronological order according to the handwriting, and to accurately reproduce the handwriting with a straight line.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the handwriting reproduction drawing process in the present embodiment is a terminal device (handwriting reproduction drawing) in a handwriting reproduction drawing system 4 including an electronic pen 1, a dedicated paper 2, and a terminal device (PC) 3. Device 3). FIG. 1 shows a usage pattern of the electronic pen 1. A dot pattern (coded pattern) is printed on the dedicated paper 2. The electronic pen 1 has a pen tip portion 6 similar to a normal ink pen. When the user writes characters or a pattern on the dedicated paper 2 by the pen tip portion 6 in the same manner as a normal ink pen, the electronic pen 1 The dot pattern printed on the dedicated paper 2 is read locally and continuously along the trajectory (handwriting) of the pen tip 6 and the coordinates of the local position on the dedicated paper 2 are calculated. The electronic pen identification ID for identifying the electronic pen 1, the written time information (time stamp), and the like are associated and transmitted to the terminal device 3. When the terminal device 3 receives the electronic pen identification ID, coordinate data, and the like from the electronic pen 1, the terminal device 3 reproduces the handwriting of the electronic pen 1 based on the coordinate data and draws it on the display (display means 24).

[Special paper]
First, the dedicated paper 2 will be described. The special paper 2 is a paper in which a dot pattern is printed on paper, and further, designs, items such as ruled lines and entry frames, words, words, illustrations, and the like are printed thereon. The dot pattern is printed with ink containing carbon that absorbs infrared rays. In addition, the design and the like are printed with ordinary ink that does not contain carbon. The dot pattern and the design may be printed on the paper at the same time, or either one may be printed first.

[Dot pattern]
Next, the dot pattern will be described. The dot pattern read by the electronic pen 1 employs the above-mentioned Anoto technology. FIG. 2 is a diagram illustrating the relationship between the dot position of the dot pattern printed on the dedicated paper 2 and the value to which the dot is converted. As shown in FIG. 2, each dot of the dot pattern is associated with a predetermined value depending on its position. That is, each dot is associated with a value of 0 to 3 depending on the direction in which the position of the dot is shifted from the reference position of the grid (intersection of vertical and horizontal lines: grid point). The value of each dot is further converted into a first bit value for the X coordinate and a second bit value for the Y coordinate. The dot pattern is configured such that the position coordinates on the dedicated paper 2 are determined by the combination of information thus associated.

  FIG. 3A shows an arrangement of dot patterns in a certain local portion on the dedicated paper 2. As shown in FIG. 3 (a), 6 × 6 dots are arranged within a range of about 2 mm in length and width so that a unique pattern can be obtained no matter where 6 × 6 dots are taken from any part of the dedicated paper 2. ing. The dot pattern formed by these 36 (= 6 × 6) dots holds the position coordinates (for example, where the dot pattern is located on the dedicated paper 2). FIG. 3B is a diagram in which each dot shown in FIG. 3A is converted into a value associated with the regularity shown in FIG. 2 according to the shift direction from the reference position of the lattice. This conversion is performed by the electronic pen 1 that captures an image of a dot pattern.

[Electronic pen]
Next, the electronic pen 1 will be described. As shown in FIG. 4, the electronic pen 1 includes a processor 8, a memory 9, a data communication unit 11, a battery 12, an LED 13, a CMOS camera 14, a pressure sensor 16, and an ink cartridge 17 inside the housing 7. . The tip of the ink cartridge 17 is a pen tip portion 6, and the user can draw a character or a picture while bringing the pen tip portion 6 of the electronic pen 1 into contact with the dedicated paper 2.

  The LED 13 and the CMOS camera 14 are attached in the vicinity of the pen tip portion 6 of the electronic pen 1, and an opening 18 is formed in a portion of the housing 7 facing the LED 13 and the CMOS camera 14. The LED 13 illuminates infrared rays toward the vicinity of the pen tip portion 6 on the dedicated paper 2 (region 19: reference FIG. 1). The region 19 is slightly deviated from the position where the pen tip portion 6 contacts the special paper 2. The camera 14 captures a dot pattern in the area 19 illuminated by the LED 13 and supplies image data of the dot pattern to the processor 8. Here, since carbon absorbs infrared rays, the infrared rays irradiated by the LED 13 are absorbed by the carbon contained in the dots at the dot portions. Therefore, the dot portion has a small amount of infrared reflection, and the portion other than the dot has a large amount of infrared reflection. Therefore, the area of the dot containing carbon and the other area can be distinguished from the difference in the amount of reflected infrared light by photographing with the camera 14. Even if a ruled line, a frame, or the like is printed in the photographing region, the dot pattern can be recognized because the ink of the ruled line, the frame, etc. does not contain carbon. Note that the shooting area by the camera 14 is a range including a size of about 2 mm × about 2 mm as shown in FIG. 3A, and shooting by the camera 14 is performed 75 times per second.

  The battery 12 is for supplying electric power to each component in the electronic pen 1. For example, the battery 12 is configured to turn on / off the electronic pen 1 itself by removing a cap (not shown) of the electronic pen 1. May be. The pressure sensor 16 detects the pressure applied to the pen tip 6 when the user writes characters or the like on the dedicated paper 2 with the electronic pen 1, that is, the writing pressure, and supplies the detected pressure to the processor 8.

  The processor 8 switches on / off the switches of the LED 13 and the camera 14 based on the writing pressure data supplied from the pressure sensor 16. That is, when the user writes characters or the like on the dedicated paper 2 with the electronic pen 1, the pen pressure is applied to the pen tip 6, and when the pressure sensor 16 detects a writing pressure higher than a predetermined value, the processor 8 Then, it is determined that the user has started entry, and the LED 13 and the camera 14 are operated.

  The processor 8 performs X and Y coordinates (simply “coordinate data”) on the dedicated paper 2 of the stroke (handwriting) to be entered by the user from the dot pattern of the image data supplied by the camera 14 while the user is filling in. Is called continuously. That is, the processor 8 converts the image data of the dot pattern as shown in FIG. 3A supplied by the camera 14 into the data array shown in FIG. 3B, and further converts the X coordinate bit value · Y The data is converted into a coordinate bit value, and X and Y coordinate data are calculated from the data array by a predetermined calculation method. Then, the processor 8 associates the current time (time stamp) transmitted from the built-in clock, the pen pressure data, and the X and Y coordinate data, and causes the data communication unit 11 to transmit the information to the terminal device 3. Since the 6 × 6 dot pattern on the dedicated paper 2 does not overlap within the dedicated paper 2, when the user fills in the necessary items with the electronic pen 1, the entered position is any position on the dedicated paper 2. Can be specified by coordinate calculation by the processor 8. In addition, time information (time stamp) entered by the user using the electronic pen 1 is associated with the coordinate data, and the coordinate data has time-dependent information and is arranged in time series order for data communication. It is transmitted from the unit 11 to the terminal device 3.

  An electronic pen identification ID for identifying the electronic pen 1 is stored in the memory 9, and coordinate data calculated by the processor 11 is arranged and stored in time series together with time information (time stamp). Go.

  The data communication unit 11 transmits / receives data to / from the terminal device 3 in the vicinity. Transmission by the data communication unit 11 is preferably performed by wireless transmission of Bluetooth (registered trademark).

[Terminal device (handwriting reproduction drawing device)]
Next, the terminal device (handwriting reproduction drawing device) 3 will be described. FIG. 5 is a functional block diagram of the terminal device 3. As shown in FIG. 5, the terminal device 3 functionally includes a data communication unit 21, a storage unit 22, a processing unit 23, and a display unit 24. The processing unit 23 includes an initial value setting unit 25, a perpendicular length calculation unit 26, a coordinate point distance determination unit 27, a first comparison determination unit 28, a second comparison determination unit 29, and a drawing control unit 30.

  The data communication unit 21 receives an electronic pen identification ID, coordinate data, time information (time stamp), and the like transmitted by the electronic pen 1 and transmits them to the processing unit 22. 1 is configured by an antenna device or the like that can perform data communication with 1.

  The storage unit 22 stores the electronic pen identification ID, coordinate data, time information (time stamp) received by the data communication unit 21 according to an instruction from the processing unit 23, or is calculated in the course of processing of the processing unit 23. Data and data obtained as a result of processing are stored. The storage unit 22 includes hardware such as a memory such as a ROM and a RAM, a hard disk, and the like.

  The processing unit 23 is in charge of handwriting reproduction drawing processing, and in particular, processes coordinate data of coordinate points arranged in time series among the information transmitted by the data communication means 21. As hardware, It is constituted by a processor such as a CPU. The processing unit 23 causes the storage unit 22 to store the position coordinates of the coordinate points in the data array tt (m) in time series, the drawing start point is t (0), and the data array is t (0), After numbering t (1),... and reshaping, each means included in the processing unit 23 performs processing for handwriting reproduction drawing processing. Hereinafter, each means will be described with reference to FIG. 6 together with FIG.

  The initial value setting means 25 is a variable k for sequentially changing the coordinate point to determine whether or not to draw the reference coordinate point t (0) and the other coordinate point t (k-1) as a straight line. Is set to an initial value “2”.

  The perpendicular length calculation means 26 uses the coordinate point t (0) as a reference point, and extends from the coordinate point t (k-1) to the straight line c (k-2) connected by the coordinate points t (0) and t (k). The distance d (k−2) is calculated.

  The coordinate point distance determination means 27 is a coordinate point distance from the coordinate point t (0) to the coordinate point t (k), that is, a distance between coordinate points t (0) -t (1), a coordinate point t. It is determined whether the distance between (1) -t (2), ..., the distance between coordinate points t (k-1) -t (k) is not less than the first threshold Dex.

  The first comparison / determination unit 28 uses the inter-coordinate point distance determination unit 27 to make all of the inter-coordinate point distances from the coordinate point t (0) to the coordinate point t (k) equal to or greater than the first threshold Dex. Is determined, the distance d (k−2) calculated by the perpendicular length calculation means 26 is compared with the second threshold value dc.

  The second comparison determination means 29 has a distance between the coordinate points t (0) to the coordinate point t (k) by the coordinate point distance determination means 27 that is less than the first threshold Dex. Is determined to exist, the distance d (k−2) calculated by the perpendicular length calculation means 26 is compared with the third threshold de that is shorter than the second threshold dc.

  The drawing control unit 30 compares the distance d (k−2) with the second threshold value dc by the first comparison / determination unit 28. As a result, the distance d (k−2) is equal to or larger than the second threshold value dc. If it is determined that there is, the line between the coordinate point t (0) and the coordinate point t (k-1) is drawn with a straight line, and the drawn straight line is displayed on the display means 24. Then, the drawing control means 30 deletes the coordinate data from the coordinate points t (0) to t (k-2) stored in the storage means 22 in order to secure the free space of the storage means 22, and responds to them. The data array tt (m) to be deleted is also deleted.

  Similarly, the drawing control unit 30 compares the distance d (k−2) with the third threshold de by the second comparison / determination unit 29, so that the distance d (k−2) is the third threshold. If it is determined that the value is greater than or equal to de, the line between the coordinate point t (0) and the coordinate point t (k-1) is drawn with a straight line, and the drawn straight line is displayed on the display unit 24. Let Further, the drawing control means 30 deletes the coordinate data from the coordinate points t (0) to t (k-2) stored in the storage means 22 in order to secure the free space of the storage means 22, and responds to them. The data array tt (m) to be deleted is also deleted.

  The drawing control unit 30 compares the distance d (k−2) with the second threshold dc or the third threshold de by the first comparison case unit 28 or the second comparison determination unit 29. If it is determined that d (k-2) is greater than or equal to the second threshold dc or the third threshold de, it is determined whether or not the next coordinate point t (k + 1) exists in time series To do. When the coordinate point t (k + 1) exists, the drawing control unit 30 sets the coordinate point t (k-1) as the reference coordinate point t (0) and the coordinate points after the coordinate point t (k-1). Are re-assigned to the coordinate points t (0), t (1), t (2), t (3), ..., t (k), ... (numbering), and the initial value setting means 25 initializes k. (K = 2), the normal length calculation means 26 performs processing. On the other hand, when the coordinate point t (k + 1) does not exist, the drawing control means 30 draws a straight line between the coordinate points t (k-1) and t (k) and displays the straight line on the display means 24. Is displayed, the coordinate data of the coordinate points t (k-1) and t (k) stored in the storage means 22 are deleted, and the data array tt (m) corresponding to them is also deleted.

  In addition, the drawing control means 30 compares the distance d (k−2) with the second threshold dc or the third threshold de by the first comparison case means 28 or the second comparison judgment means 29. , When it is determined that the distance d (k−2) is less than the second threshold value dc or the third threshold value de, k is incremented (k = k ++) to obtain a new distance d (k−2). ) To the perpendicular length calculation means 26 to perform processing.

  The display unit 24 displays a straight line drawn by the drawing control unit 30 and is configured by a display or the like as hardware.

[Drawing application]
Next, the drawing processing application 40 will be described with reference to FIG. FIG. 7 is a module configuration diagram of the drawing processing application 40 executed in the terminal device (handwriting reproduction drawing device) 3 and corresponds to the drawing processing program.

  As shown in FIG. 7, the drawing processing application 40 includes a data communication module 40, an information storage module 42, and a processing module 43. The processing module 43 includes an initial value setting module 44, a perpendicular length calculation module 45, and a coordinate point distance. A determination module 46, a first comparison determination unit 47, a second comparison determination unit 48, and a drawing control module 49 are provided.

  The data communication module 41 has a function of receiving an electronic pen identification ID, coordinate data of coordinate points, time information (time stamp), and the like transmitted by the electronic pen 1, and causes the terminal device 3 to configure the data communication means 21. It is a module.

  The information storage module 42 stores the electronic pen identification ID, coordinate data, time information (time stamp), etc. received by the data communication means 21 in accordance with an instruction from the processing unit 23, or calculates in the process of the processing unit 23. This is a module that has a function of storing the data to be processed and the data obtained as a result of the processing in the storage unit 22, and causes the terminal device 3 to configure the storage unit 22.

  The processing module 43 controls the handwriting reproduction drawing process, causes the storage means 22 to store the position coordinates of the coordinate points in the data array tt (m) in time series, and sets the drawing start point as t (0). After the array is numbered t (0), t (1), ... and re-assigned, each means provided in the processing unit 23 has a function of performing processing for handwriting reproduction drawing processing. This module constitutes the processing unit 23.

  The initial value setting module 44 determines whether or not to draw a reference coordinate point t (0) and another coordinate point t (k-1) as a straight line by sequentially changing the coordinate points. On the other hand, this is a module that has a function of setting an initial value and causes the terminal device 3 to configure the initial value setting means 25.

  The perpendicular length calculation module 45 uses the coordinate point t (0) as a reference point, and extends from the coordinate point t (k-1) to the straight line c (k-2) connected by the coordinate points t (0) and t (k). This is a module that has the function of calculating the distance d (k−2) of the terminal device 3 and constitutes the perpendicular length calculating means 26 in the terminal device 3.

  The inter-coordinate point distance determination module 46 determines the inter-coordinate point distance from the coordinate point t (0) to the coordinate point t (k), that is, the distance between the coordinate points t (0) -t (1), the coordinate point t. (1) Has a function to determine whether the distance between t (2), ..., the distance between coordinate points t (k-1) -t (k) is equal to or greater than the first threshold Dex. This is a module that causes the terminal device 3 to form the coordinate point distance determination means 27.

  The first comparison / determination module 47 uses the inter-coordinate point distance determination means 27 to make all the inter-coordinate point distances from the co-ordinate point t (0) to the co-ordinate point t (k) equal to or greater than the first threshold Dex. If it is determined, the distance d (k−2) calculated by the perpendicular length calculation unit 26 and the second threshold value dc are compared, and the terminal device 3 includes the first comparison determination unit 28. Is a module that configures

  The second comparison determination module 48 uses the distance between coordinate points determination means 27 to determine that the distance between coordinate points t (0) to t (k) is less than the first threshold Dex. A terminal device that has a function of comparing the distance d (k−2) calculated by the perpendicular length calculation means 26 with a third threshold de that is shorter than the second threshold dc, 3 is a module that constitutes the second comparison determination means 29.

  The drawing control module 50 determines whether the reference coordinate point t (0) and the coordinate point t (k-1) are based on the result of the determination by the first comparison determination unit 28 or the determination by the second comparison determination unit 29. Is drawn on a straight line and displayed on the display means 24, and a new setting is made from the reference coordinate point t (0) to proceed with the appropriateness of drawing a straight line, or k is incremented to increase the reference coordinate point t. Coordinate data that became unnecessary to secure free space in the process of drawing a straight line between (0) and the newly set coordinate point t (k-1) Or the like from the storage means 22. The drawing control module 50 is a module that causes the terminal device 3 to form the drawing control means 30.

[Drawing process flow]
Next, a drawing processing flow in the terminal device (handwriting reproduction drawing device) 3 will be described with reference to FIG. This drawing processing flow is a flowchart in which the terminal device 3 processes the coordinate data of coordinate points having a temporal order corresponding to the handwriting transmitted by the electronic pen 1 after receiving.

  In the terminal device 3, the electronic pen identification ID, the coordinate data of the coordinate point, time information (time stamp), and the like transmitted by the electronic pen 1 are received by the data communication unit 21 and transmitted to the processing unit 23. The processing unit 23 stores the electronic pen identification ID, the coordinate data, the time information, and the like in the storage unit 22 and also stores the sequentially transmitted coordinate data in the data array tt (m in the storage unit 22 in time series. ) [m = 0, 1, 2,...] (step 101).

  Further, the processing unit 23 sets the drawing start point tt (0) to t (0), numbers the data array to t (0), t (1),. Subsequently, the initial value setting means 25 sets an initial value “2” for the variable k (step 103).

  The perpendicular length calculation means 26 calculates the distance d (0) between the straight line c (0) connected by the coordinate points t (0) and t (2) and the coordinate point t (1), where k = 2. Step 104). Subsequently, the inter-coordinate point distance determination unit 27 determines the inter-coordinate point distance from the co-ordinate point t (0) to the co-ordinate point t (2), that is, the distance between the co-ordinate points t (0) -t (1), It is determined whether all the distances between the coordinate points t (1) -t (2) are equal to or greater than the first threshold Dex (step 105).

  The distance between the coordinate points t (0) -t (1) and the distance between the coordinate points t (1) -t (2) are all greater than or equal to the first threshold Dex by the distance determination means 27 between the coordinate points. (Step 105: Yes), the first comparison determination means 28 compares the distance d (0) calculated by the perpendicular length calculation means 26 with the second threshold dc (Step 106). On the other hand, the inter-coordinate-point distance determining means 27 determines the first threshold Dex among the distance between the coordinate points t (0) -t (1) and the distance between the coordinate points t (1) -t (2). When it is determined that there is less than (step 105: NO), the second comparison / determination means 29 uses the distance d (k−2) calculated by the perpendicular length calculation means 26 and the second threshold value dc. Is compared with the short third threshold value de (step 107).

  As a result of comparing the distance d (0) with the second threshold dc by the first comparison / determination means 28, it is determined that the distance d (0) is less than the second threshold dc (step 106: No) Or, as a result of comparing the distance d (0) with the third threshold de by the second comparison / determination means 29, it is determined that the distance d (0) is less than the third threshold de. In the case (step 107: No), the drawing control means 30 increments k (k = 2 + 1 + 1 = 3) (step 108), and repeatedly executes steps 104 to 107. That is, in step 104, the perpendicular length calculation means 26 calculates the distance d (1) between the straight line c (1) connected by the coordinate points t (0) and t (3) and the coordinate point t (2). In Step 105, whether or not all the coordinate point distances from the coordinate point t (0) to the coordinate point t (3) are greater than or equal to the first threshold Dex by the coordinate point distance determination means 27. Is determined. In step 106, the first comparison / determination means 28 compares the distance d (1) with the second threshold value dc. In step 107, the second comparison / determination means 29 compares the distance d (1). ) And the third threshold de.

  In this way, when the distance d (k-2) is less than the second threshold dc or the third threshold de in steps 106 and 107, the coordinate point t (k-1) and the reference coordinate point t ( 0), it is determined that it is not necessary to draw a straight line, and the drawing control means 30 increments k to determine whether or not to draw a straight line between the next coordinate point and the reference coordinate point. Go.

  On the other hand, if it is determined in steps 106 and 107 that the distance d (k−2) is greater than or equal to the second threshold dc or the third threshold de (steps 106 and 107: Yes), the drawing control means. 30 draws a straight line between the coordinate point t (0) and the coordinate point t (k-1) and causes the display unit 24 to display the drawn straight line (step 109). Furthermore, the drawing control means 30 deletes the coordinate data from the coordinate points t (0) to t (k-2) stored in the storage means 22 in order to secure free space in the storage means 22, and responds to them. The data array tt (m) to be deleted is also deleted (step 110).

  Further, the drawing control means 30 determines whether or not the next coordinate point t (k + 1) exists in time series (step 111). This is to determine whether the coordinate point t (k + 1) is the last coordinate point that has been pen-up, or whether there are more coordinate points that continue in time series. When the coordinate point t (k + 1) exists, the drawing control unit 30 sets the coordinate point t (k-1) as the reference coordinate point t (0) and the coordinate points after the coordinate point t (k-1). Are renumbered as coordinate points t (0), t (1), t (2), t (3),..., T (k), ... (step 112), and steps 103 to 111 are repeated. . This is because one end point of the drawn straight line is set as a new reference coordinate point t (0) and the straight line drawing process is subsequently performed.

  In step 111, when the coordinate point t (k + 1) does not exist, since the coordinate point t (k) is the last coordinate point, the drawing control means 30 determines that the coordinate point t (k-1) and t (k) is drawn as a straight line, the straight line is displayed on the display means 24 (step 113), and the coordinate data of the coordinate points t (k-1) and t (k) stored in the storage means 22 are displayed. In addition to erasing, the data array tt (m) corresponding to them is also erased (step 114).

[Drawing example]
Next, with reference to FIG. 9 to FIG. 13, a drawing example by this drawing process is shown. Here, as shown in FIG. 9, a description will be given of drawing on seven coordinate points tt (0) to tt (6) having a temporal order corresponding to the handwriting transmitted by the electronic pen 1. Note that the distance between coordinate points tt (0)-tt (1), the distance between coordinate points tt (1)-tt (2), the distance between coordinate points tt (4)-tt (5), and the coordinate points The distance between tt (5) and tt (6) is not less than the first threshold Dex, and the distance between the coordinate points tt (2) and tt (3) and the coordinate points tt (3) and tt (4 ) Is assumed to be less than the first threshold Dex.

  The processing unit 23 stores the coordinate data having the time order received by the data communication unit 21 in the data array tt (m) [m = 0 to 6] of the storage unit 22 in time series (step 101). ). Then, as shown in FIG. 10, the processing unit 23 further sets the drawing start point tt (0) to t (0) and sets the data arrays tt (0), tt (1),... To t (0), t Numbering (1), ... and re-assigning (step 102). Subsequently, the initial value setting means 25 sets an initial value “2” for the variable k (step 103).

  The perpendicular length calculation means 26 calculates the distance d (0) between the straight line c (0) connected by the coordinate points t (0) and t (2) and the coordinate point t (1), where k = 2. Step 104). Subsequently, the inter-coordinate point distance determination unit 27 determines the inter-coordinate point distance from the co-ordinate point t (0) to the co-ordinate point t (2), that is, the distance between the co-ordinate points t (0) -t (1), The distance between the coordinate points t (1) -t (2) is compared with the first threshold Dex, and it is determined that the distance between any coordinate points is equal to or greater than the first threshold Dex (step 105: YES).

  In response to the determination by the coordinate point distance determination means 27, the second comparison determination means 29 compares the distance d (0) calculated by the perpendicular length calculation means 26 with the second threshold value dc, and d (0). It is assumed that <dc is determined (Step 106: No). Then, the drawing control means 30 increments k (k = 2 + 1 = 3) (step 108), and repeatedly executes steps 104 to 107.

  That is, the perpendicular length calculation means 26 calculates the distance d (1) between the straight line c (1) connected by the coordinate points t (0) and t (3) and the coordinate point t (2) (step 104). . Subsequently, the inter-coordinate-point distance determining unit 27 determines the inter-coordinate point distance from the coordinate point t (0) to the coordinate point t (3), that is, the distance between the coordinate points t (0) −t (1), The distance between the coordinate point t (1) -t (2), the distance between the coordinate point t (2) -t (3), and the first threshold Dex are respectively compared, and the coordinate point t (2) -t It is determined that the distance between (3) is less than the first threshold Dex (step 105: No).

  Subsequently, the second comparison / determination means 29 compares the distance d (1) calculated by the perpendicular length calculation means 26 with the third threshold de, and determines that d (1)> de. (Step 107: Yes). Then, the drawing control means 30 draws a straight line between the coordinate point t (0) and the coordinate point t (2) and causes the display means 24 to display the drawn straight line (step 109). At the same time, the drawing control means 30 deletes the coordinate data from the coordinate points t (0) to t (1) stored in the storage means 22 in order to secure free space in the storage means 22, and responds to them. The data arrays tt (0) and tt (1) are also deleted (step 110).

  Further, the drawing control means 30 determines that the next coordinate point t (4) (see FIG. 10) exists in time series (step 111: YES), and sets the coordinate point t (2) as a new reference coordinate point t. As (0), the coordinate points after coordinate point t (2) are numbered and shaken as coordinate points t (0), t (1), t (2), t (3), ..., t (k), ... Fix (step 112) and return to step 104. The state of the drawing process at this time is shown in FIG.

  Then, the initial value setting means 25 sets k to an initial value “2”, and the perpendicular length calculation means 26 determines that the straight line c (0) connected by the new coordinate points t (0) and t (2) and the coordinate point A distance d (0) from t (1) is calculated (step 104). Subsequently, the inter-coordinate point distance determination unit 27 determines the inter-coordinate point distance from the co-ordinate point t (0) to the co-ordinate point t (2), that is, the distance between the co-ordinate points t (0) -t (1), The distances between the coordinate points t (1) -t (2) are both determined to be less than the first threshold Dex (step 105: No), and the second comparison / determination means 29 is the perpendicular length calculation means 26. The distance d (0) calculated by the above and the third threshold value de are compared, and d (0) <de is determined (step 107: No).

  Subsequently, the drawing control means 30 increments k (k = 2 + 1 = 3) (step 108), and the perpendicular length calculation means 26 is connected at the coordinate points t (0) and t (3). A distance d (1) between the straight line c (1) and the coordinate point t (2) is calculated (step 104). Subsequently, the inter-coordinate-point distance determining unit 27 determines the inter-coordinate point distance from the coordinate point t (0) to the coordinate point t (3), that is, the distance between the coordinate points t (0) −t (1), The distance between the coordinate points t (1) −t (2), the distance between the coordinate points t (2) −t (3) and the first threshold Dex are respectively compared, and the coordinate point t (0) −t ( It is determined that the distance between 1) and the distance between coordinate points t (1) -t (2) are less than the first threshold Dex (step 105: No).

  The second comparison / determination means 29 compares the distance d (1) calculated by the perpendicular length calculation means 26 with the third threshold de, and determines that d (1)> de (step 107: Jesus). Then, the drawing control means 30 draws a straight line between the coordinate point t (0) and the coordinate point t (2) and causes the display means 24 to display the drawn straight line (step 109). Further, the drawing control means 30 deletes the coordinate data from the coordinate points t (0) to t (1) stored in the storage means 22 to secure the free space in the storage means 22, and the data corresponding thereto. The arrays tt (2) and tt (3) are also deleted (step 110).

  Further, the drawing control means 30 determines that the next coordinate point t (4) exists in time series (step 111), and uses the coordinate point t (2) as a new reference coordinate point t (0). (2) The subsequent coordinate points are numbered with the coordinate points t (0), t (1), and t (2) and re-assigned (step 112), and the process returns to step 104. The state of the drawing process at this time is shown in FIG.

  The initial value setting means 25 sets k to an initial value “2”, and the perpendicular length calculation means 26 sets k = 2, the straight line c (0) connected by the coordinate points t (0) and t (2), and the coordinate point A distance d (0) from t (1) is calculated (step 104). Subsequently, the inter-coordinate point distance determination unit 27 determines the inter-coordinate point distance from the co-ordinate point t (0) to the co-ordinate point t (2), that is, the distance between the co-ordinate points t (0) -t (1), The distance between the coordinate points t (1) -t (2) is compared with the first threshold value Dex, and it is determined that both the coordinate point distances are equal to or greater than the first threshold value Dex (step 105: YES). . Subsequently, the first comparison / determination means 28 compares the distance d (0) calculated by the perpendicular length calculation means 26 with the second threshold dc and determines that d (0)> dc (step). 106: Yes).

  The drawing control unit 30 draws a straight line between the coordinate point t (0) and the coordinate point t (1) in response to the determination of the first comparison determination unit 28 and draws the drawing on the display unit 24. The straight line thus displayed is displayed (step 109). Further, the drawing control means 30 deletes the coordinate data of the coordinate point t (0) stored in the storage means 22 in order to secure the free space in the storage means 22, and also the data array tt (4) corresponding to them. Erase (step 110).

  Further, the drawing control means 30 determines that the next coordinate point t (3) does not exist in time series (step 111: No), and the last point due to the coordinate point t (2) being pen-up. When the coordinate point is recognized, as shown in FIG. 13, a straight line is drawn between the coordinate points t (1) and t (2) and the straight line is displayed on the display means 24 (step 113). The coordinate data of the coordinate points t (0), t (1), t (2) stored in the storage means 22 is deleted, and the corresponding data arrays tt (4), tt (5), tt (6 ) Is also deleted (step 114). Finally, coordinate points tt (0), tt (2), tt (4), tt (5), and tt (6) were selected, and an image with straight lines drawn in this order was obtained. (See FIGS. 9 and 13).

[Effects of this drawing process]
According to the drawing process by the terminal device 3, the coordinate point is determined depending on whether or not all the distances between the coordinate points from the coordinate point t (0) to the coordinate point t (k) are equal to or greater than the first threshold Dex. The threshold value to be compared with the distance d (k-2) from t (k-1) to the straight line c (k-2) connected by the coordinate points t (0) and t (k) is different. That is, when it is determined by the coordinate point distance determination means 27 that all the coordinate point distances from the coordinate point t (0) to the coordinate point t (k) are equal to or greater than the first threshold Dex. When the distance d (k−2) calculated by the perpendicular length calculation means 25 and the second threshold value dc are compared by the first comparison / determination means 28, and there is a value less than the first threshold value Dex. The second comparison / determination means 29 compares the distance d (k−2) with the third threshold de that is shorter than the second threshold dc. In addition, when the distance d (k−2) is equal to or greater than the second threshold value dc or the third threshold value de, the drawing control unit 30 calculates the coordinate point t (0) and the coordinate point t (k). Since it is too far from the coordinate point t (k-1) to be connected by a straight line, the drawing control means does not accept the coordinate point t (k-1) in time series before the coordinate point t (k). ) And a coordinate point t (0). Furthermore, the drawing control means 30 uses the coordinate point t (k-1) as the reference coordinate point t (0), and coordinates points after the coordinate point t (k-1) as coordinate points t (0), t (1), .., t (k),... are re-assigned to cause the perpendicular length calculation means 26 to perform processing, so that the same drawing processing is continuously repeated.

  As described above, the second threshold value dc and the third threshold value de having different sizes are connected from the coordinate point t (k−1) to the coordinate points t (0) and t (k) according to the distance between the coordinate points. Compared with the distance d (k-2) to the straight line c (k-2), it is determined whether or not to draw a straight line. The handwriting can be accurately reproduced.

  Further, as shown in step 109, the drawing control unit 30 draws a straight line between the coordinate point t (0) and the coordinate point t (k-1) and draws it on the display unit 24. Since a straight line is displayed, it is displayed on the display means 24 each time it is determined that drawing with a straight line is appropriate, and the drawing can be performed promptly according to the order over time according to the handwriting. Therefore, if the writing using the electronic pen 1 and the drawing process by the terminal device 3 are performed almost simultaneously, the display by the display means 24 can be performed in almost real time as the writing by the electronic pen 1.

  Further, as shown in step 110, the drawing control means 30 deletes the coordinate data from the coordinate points t (0) to t (k-2) that are no longer needed, stored in the storage means 22, and Since the data array tt (m) corresponding to is also deleted, the free space of the storage means 22 is secured, and the processing load can be reduced.

  The present invention is not limited to the above embodiment.

  When the user has positioned the pen tip 6 of the electronic pen 1 at the same position with respect to the dedicated paper 2 for a while, the terminal device 3 continuously receives a plurality of position coordinate data of the same coordinate point. Become. In such a case, in order to reduce the burden of the drawing process, it is preferable that the processing unit 23 collects the position coordinate data of the same continuous coordinate point into one coordinate data and performs the drawing process.

  In the above embodiment, the electronic pen identification ID is adopted as the information stored in the electronic pen 1 and transmitted to the terminal device 3, but in addition, the battery level of the electronic pen 1, the pen manufacturer number, the version of the pen software The ID of the subscription provider, the free memory capacity, etc. may be stored and transmitted to the terminal device 3. Alternatively, nationality, language, time zone, email address, name, address, fax / phone number, mobile phone number, etc. may be stored in the electronic pen 1 and transmitted to the terminal device 3 as pen owner information. Good.

  Further, in the above embodiment, the dots are ink containing carbon that absorbs infrared rays, the LEDs 13 of the electronic pen 1 are LEDs that irradiate infrared rays, and the dot pattern of the electronic pen 1 is determined by the difference in the amount of reflected infrared rays by the camera 14. However, it is not limited to this. For example, the dot is ink that emits light of a predetermined wavelength by light of a predetermined wavelength, the LED 13 of the electronic pen 1 is irradiated with light that emits the ink of the dot, and the region of the wavelength that the ink of the dot emits light by the camera 14 is set. By detecting the dot pattern, the electronic pen 1 may read the dot pattern. If the dot pattern can be read by the camera 14, the ink type of the dot and the irradiation light of the LED 13 are limited to those shown in the above embodiment. I can't. Further, as long as the position coordinates on the dedicated paper 2 can be specified, another coded pattern such as a two-dimensional code pattern may be used instead of the dot pattern.

It is a figure which shows the structure of the handwriting reproduction drawing system in this embodiment. It is a figure explaining the value by which the dot of the dot pattern printed on the exclusive paper is converted. (A) is a schematic diagram of a dot pattern, and (b) is a diagram showing a distribution of conversion values corresponding thereto. It is a block diagram which shows the structure of an electronic pen. It is a functional block diagram which shows the structure of a terminal device. It is a conceptual diagram for demonstrating this drawing process. It is a module block diagram of a drawing process application. It is a flowchart of this drawing process. It is a figure which shows the initial state of the coordinate point in the example of a drawing by this drawing process. It is a figure which shows the process (the 1) of the example of a drawing by this drawing process. It is a figure which shows the process (the 2) of the example of a drawing by this drawing process. It is a figure which shows the process (the 3) of the example of a drawing by this drawing process. It is a figure which shows the drawing result of the example of a drawing by this drawing process It is a figure which shows the initial state of the coordinate point in the example of a drawing by the conventional drawing process. It is a figure which shows the process (the 1) of the example of a drawing by the conventional drawing process. It is a figure which shows the process (the 2) of the example of a drawing by the conventional drawing process. It is a figure which shows the drawing result of the example of a drawing by the conventional drawing process.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Electronic pen, 2 ... Exclusive paper, 3 ... Terminal device, 4 ... Handwriting reproduction drawing system, 21 ... Data communication means, 22 ... Memory | storage means, 23 ... Processing part, 24 ... Display means, 25 ... Initial value setting means, 26 ... perpendicular length calculation means, 27 ... distance determination means between coordinate points, 28 ... first comparison judgment means, 29 ... second comparison judgment means, 30 ... drawing control means, 40 ... drawing processing application, 41 ... data communication Module, 42 ... Information storage module, 43 ... Processing module, 44 ... Initial value setting module, 45 ... Perpendicular length calculation module, 46 ... Distance determination module between coordinate points, 47 ... First comparison determination module, 48 ... Second Comparison determination module 49... Drawing control module.

Claims (6)

Select some coordinate points from multiple coordinate points t (0), t (1), t (2), t (3), ..., t (k), ... that have a time-dependent order according to the handwriting Then, a handwriting reproduction drawing method for reproducing handwriting with a plurality of straight lines,
The distance d (k-2) from the coordinate point t (0) to the straight line c (k-2) connected by the coordinate points t (0) and t (k) with the coordinate point t (0) as the reference point ) To calculate),
A second step for determining whether or not all the distances between the coordinate points from the coordinate point t (0) to the coordinate point t (k) are equal to or greater than a first threshold Dex;
In the second step, when all the distances between the coordinate points t (0) to the coordinate point t (k) are greater than or equal to the first threshold Dex, the distance d (k calculated in the first step -2) and the second threshold value dc, and in the second step, the distance between coordinate points t (0) to coordinate point t (k) is less than the first threshold Dex. If present, a third step of comparing the distance d (k−2) calculated in the first step with a third threshold de that is shorter than the second threshold dc;
As a result of comparing the distance d (k-2) with the second threshold dc or the third threshold de in the third step, the distance d (k-2) is greater than or equal to the second threshold dc or the third threshold de. In this case, a straight line is drawn between the coordinate point t (0) and the coordinate point t (k-1), and the coordinate point t (k-1) is used as the reference coordinate point t (0). k-1) and subsequent coordinate points are re-assigned as coordinate points t (0), t (1), t (2), t (3),..., t (k),. On the other hand, if the distance d (k−2) is less than the second threshold dc or the third threshold de, the fourth step increments k and proceeds to each step after the first step. A handwriting reproduction drawing method characterized by including.   The handwriting reproduction drawing method according to claim 1, wherein the first to fourth steps are performed with an initial value of k being 2. Select some coordinate points from multiple coordinate points t (0), t (1), t (2), t (3), ..., t (k), ... that have a time-dependent order according to the handwriting A handwriting reproduction drawing device that reproduces handwriting with a plurality of straight lines,
The distance d (k-2) from the coordinate point t (0) to the straight line c (k-2) connected by the coordinate points t (0) and t (k) with the coordinate point t (0) as the reference point ) For calculating the perpendicular length,
A coordinate point distance determination means for determining whether or not all the coordinate point distances from the coordinate point t (0) to the coordinate point t (k) are equal to or greater than a first threshold Dex;
If the distance between coordinate points is determined by the coordinate point distance determination means to be equal to or greater than the first threshold Dex from the coordinate point t (0) to the coordinate point t (k), the perpendicular line First comparison determination means for comparing the distance d (k−2) calculated by the length calculation means with the second threshold dc;
When it is determined by the coordinate point distance determination means that there is a distance between the coordinate points t (0) to the coordinate point t (k) that is less than the first threshold Dex, A second comparison / determination unit that compares the distance d (k−2) calculated by the perpendicular length calculation unit with a third threshold de that is shorter than the second threshold dc;
As a result of comparing the distance d (k−2) with the second threshold value dc or the third threshold value de by the first or second comparison / determination means, the distance d (k−2) becomes the second threshold value. If it is determined that dc or greater than the third threshold de, the coordinate point t (0) and the coordinate point t (k-1) are drawn with a straight line, and the coordinate point t (k-1 ) As a reference coordinate point t (0), coordinate points after coordinate point t (k-1) are coordinate points t (0), t (1), t (2), t (3), ..., t (k ),..., And causes the perpendicular length calculation means to perform processing, while the distance d (k−2) is set to a second threshold value dc or a third value by the first or second comparison / determination means. A handwriting reproduction drawing apparatus, comprising: a drawing control means for incrementing k and causing the perpendicular length calculation means to perform processing when it is determined that the value is less than the threshold de.   The handwriting reproduction drawing apparatus according to claim 3, further comprising initial value setting means for setting an initial value of k to 2. A display means for displaying the drawing;
The said drawing control means makes the said display means draw whenever it draws between the coordinate point t (0) and the coordinate point t (k-1) with a straight line, The Claim 3 or 4 characterized by the above-mentioned. Handwriting reproduction drawing device. Select some coordinate points from multiple coordinate points t (0), t (1), t (2), t (3), ..., t (k), ... that have a time-dependent order according to the handwriting And a program executed by a handwriting reproduction drawing device that reproduces handwriting with a plurality of straight lines,
The distance d (k-2) from the coordinate point t (0) to the straight line c (k-2) connected by the coordinate points t (0) and t (k) with the coordinate point t (0) as the reference point ) For calculating the perpendicular length,
A coordinate point distance determination means for determining whether or not all the coordinate point distances from the coordinate point t (0) to the coordinate point t (k) are equal to or greater than a first threshold Dex;
If the distance between coordinate points is determined by the coordinate point distance determination means to be equal to or greater than the first threshold Dex from the coordinate point t (0) to the coordinate point t (k), the perpendicular line First comparison determination means for comparing the distance d (k−2) calculated by the length calculation means with the second threshold value dc;
When it is determined by the coordinate point distance determination means that there is a distance between the coordinate points t (0) to the coordinate point t (k) that is less than the first threshold Dex, A second comparison / determination unit that compares the distance d (k−2) calculated by the perpendicular length calculation unit with a third threshold de that is shorter than the second threshold dc;
As a result of comparing the distance d (k−2) with the second threshold value dc or the third threshold value de by the first or second comparison / determination means, the distance d (k−2) becomes the second threshold value. If it is determined that dc or greater than the third threshold de, the coordinate point t (0) and the coordinate point t (k-1) are drawn with a straight line, and the coordinate point t (k-1 ) As a reference coordinate point t (0), coordinate points after coordinate point t (k-1) are coordinate points t (0), t (1), t (2), t (3), ..., t (k ),..., And causes the perpendicular length calculation means to perform processing, while the distance d (k−2) is set to a second threshold value dc or a third value by the first or second comparison / determination means. A program that causes a computer to function as a handwriting reproduction drawing apparatus including a drawing control unit that increments k and causes the perpendicular length calculation unit to perform processing when it is determined that the value is less than a threshold de.

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