JP2013206234A - Writing input device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a writing input device capable of suppressing a problem of increasing the load of a writing instrument in such a conventional technology which detects movement by independent processing by the writing instrument and enhancing the reproducibility of handwriting.SOLUTION: The movement of a tip of a pen 10 is detected by an acceleration sensor 12 provided in the pen. An x axis is allocated to a writing surface, that is, a touch panel 26. A CPU 24t repeatedly detects as touch coordinates a position on the writing surface with the tip of the pen brought into contact therewith, calculates an angle of deviation with respect to an X axis in a movement direction detected by the acceleration sensor on the basis of a plurality of detected touch coordinates, and corrects each of the plurality of detected touch coordinates on the calculated angle of deviation.

Description

  The present invention relates to a writing input device, and more particularly to a writing input device having a writing surface written by a writing tool having a tip.

  An example of a writing instrument having a tip is disclosed in Patent Document 1. According to this background art, the movement direction and the movement amount of the pen tip are detected by the rotation direction movement amount detection unit that refers to the rotation direction and the rotation amount of the ball. The rotational angular velocity around the Zs axis is detected by a Zs axis gyro. The correction unit corrects the movement direction and the movement amount detected by the rotation direction movement amount detection unit based on the rotation angular velocity around the Zs axis detected by the Zs axis gyro. As a result, accurate writing input is possible.

JP-A-11-95915

  However, in the background art, since the movement of the pen tip is detected by a single process using a writing instrument (pen-type input device), there is a problem that the load on the writing instrument is large.

  Therefore, a main object of the present invention is to provide a writing input device capable of suppressing the load of the writing tool and improving the reproducibility of the handwriting.

  A writing input device according to the present invention (20: reference numeral corresponding to the embodiment; hereinafter the same) has a writing surface (26) to which a reference axis is assigned, and includes detection means (12) for detecting the movement of the tip. A writing input device written by the writing instrument (10), wherein the position detecting means (S27 to S29, S43) for repeatedly detecting the position on the writing surface where the tip contacts, the reference of the direction of movement detected by the detecting means Deviation detection means (S3 to S15, S37 to S43) for detecting the deviation relative to the axis based on the detection result of the position detection means, and the deviation detected by the deviation detection means for the position detected by the position detection means Position correcting means (S55 to S61) for correcting based on the above.

  Preferably, the declination detecting means is a first difference detecting means (S9) for detecting a difference between a direction of a line connecting a plurality of positions detected by the position detecting means and a reference direction, and the movement detected by the detecting means. The second difference detecting means (S11) for detecting the difference between the direction and the reference direction, and detecting the declination based on the difference detected by the first difference detecting means and the difference detected by the second difference detecting means. A detection processing means (S13) is included.

  More preferably, an azimuth detecting means (32) for detecting the azimuth based on magnetism is further provided, and the reference direction corresponds to the azimuth detected by the azimuth detecting means.

  Preferably, the position correction means includes correction processing means (S59) for executing position correction based on the angle detected by the declination detection means and the position correction history.

  Preferably, a drawing unit (S63) for drawing a line connecting the positions corrected by the position correction unit on the writing surface is further provided.

  The writing input program according to the present invention has a writing surface (26) to which a reference axis is assigned, and a writing input device (20) written by a writing instrument (10) provided with a detecting means (12) for detecting the movement of the tip. The position detection step (S27 to S29, S43) for repeatedly detecting the position on the writing surface where the tip is in contact with the processor (24t), and the position detection step for the angle of deviation of the direction of movement detected by the detection means with respect to the reference axis Declination detection step (S3 to S15, S37 to S43) for detecting based on the detection result of the position, and position correction step for correcting the position detected by the position detection step based on the declination detected by the declination detection step This is a writing input program for executing (S55 to S61).

  The writing input method according to the present invention has a writing surface (26) to which a reference axis is assigned, and a writing input device (20) written by a writing tool (10) having a detecting means (12) for detecting the movement of the tip. The position detection step (S27 to S29, S43) for repeatedly detecting the position on the writing surface that is in contact with the tip, the deviation angle of the direction of movement detected by the detection means with respect to the reference axis Is detected based on the detection result of the position detection step (S3 to S15, S37 to S43), and the position detected by the position detection step is corrected based on the declination detected by the declination detection step. Position correction steps (S55 to S61).

  An external control program according to the present invention includes a writing surface (26) to which a reference axis is assigned, and a processor (24t) that executes processing according to an internal control program stored in a memory (34), and detects the movement of the tip. A position detection step (S27) for repeatedly detecting a position on the writing surface where the tip is in contact with an external control program supplied to a writing input device (20) written by a writing instrument (10) provided with a detecting means (12). S29, S43), declination detection step (S3 to S15, S37 to S43) for detecting the declination of the direction of movement detected by the detection means with respect to the reference axis based on the detection result of the position detection step, and position detection External position for causing the processor to execute a position correction step (S55 to S61) for correcting the position detected by the step based on the deviation detected by the deviation detection step in cooperation with the internal control program. Is a control program.

  The writing input device (20) according to the present invention includes a writing surface (26) to which a reference axis is assigned, a capturing means (22) for capturing an external control program, and an external control program and memory (34) captured by the capturing means. A writing input device written by a writing instrument (10) comprising a processor (24t) for executing processing according to a stored internal control program and having a detecting means (12) for detecting the movement of the tip, the external control program Is a position detection step (S27 to S29, S43) that repeatedly detects the position on the writing surface with which the tip contacts, and the deviation angle of the direction of movement detected by the detection means relative to the reference axis is based on the detection result of the position detection step. The position detected by the declination detection step (S3 to S15, S37 to S43) and the position detection step are corrected based on the declination detected by the declination detection step. The location correction step (S55 ~ S61) corresponds to the internal control program in cooperation with a program to be executed.

  According to the present invention, when the writing surface to which the reference axis is assigned is written by the tip of the writing instrument, the deflection angle of the direction of movement of the tip with respect to the reference axis is detected. The position where the tip contacts is corrected based on the detected declination. Thereby, the reproducibility of a handwriting can be improved, suppressing the load of a writing instrument.

  The above object, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

It is a block diagram which shows the basic composition of one Example of this invention. It is a block diagram which shows the structure of one Example of this invention. It is a perspective view which shows an example of the external appearance of the FIG. 2 Example. It is an illustration figure which shows an example of a structure of the matrix switch provided in the touch panel. FIG. 3 is an illustrative view showing one example of a configuration of a register applied to the embodiment in FIG. 2; It is an illustration figure which shows an example of the operation | movement which calculates the angle of the handwriting with respect to an X-axis. It is an illustration figure which shows an example of the touch coordinate detected by the handwriting drawn on the touch panel, and the touch panel. It is an illustration figure which shows an example of the line drawn by the display apparatus. It is a flowchart which shows a part of operation | movement of CPU applied to the FIG. 2 Example. It is a flowchart which shows a part of other operation | movement of CPU applied to the FIG. 2 Example. FIG. 11 is a flowchart showing still another portion of behavior of the CPU applied to the embodiment in FIG. 2;

Embodiments of the present invention will be described below with reference to the drawings.
[Basic configuration]

  With reference to FIG. 1, the writing instrument 1 is provided with the detection means 1a which detects the motion of a front-end | tip. The writing input device 2 has a writing surface 2 a to which a reference axis is assigned and written by the writing tool 1. The position detection means 2b repeatedly detects the position on the writing surface 2a where the tip contacts. The declination detection means 2c detects the declination of the direction of movement detected by the detection means 1a with respect to the reference axis based on the detection result of the position detection means 2b. The position correction unit 2d corrects the position detected by the position detection unit 2b based on the declination detected by the declination detection unit 2c.

Therefore, when the writing surface 2a to which the reference axis is assigned is written by the tip of the writing instrument 1, the deflection angle of the direction of movement of the tip with respect to the reference axis is detected. The position where the tip contacts is corrected based on the detected declination. Thereby, the reproducibility of handwriting can be improved while suppressing the load of the writing instrument 1.
[Example]

  2 and 3, the handwriting input system 100 of this embodiment is formed by a pen 10 having a pointed tip and a tablet 20 having a writing surface, that is, a touch panel 26. Both the pen 10 and the tablet 20 are driven by a battery (not shown).

  The movement of the tip of the pen 10 is detected by the acceleration sensor 12. The communication I / F 14 repeatedly captures the detection result of the acceleration sensor 12 and repeatedly transfers the captured detection result toward the tablet 20. On the other hand, in the tablet 20, the matrix switch MSW shown in FIG. 4 is provided on the surface of the touch panel 26. 4, a plurality of switches SW, SW,... Are arranged in a matrix in each of the X-axis direction and the Y-axis direction.

  When the tip of the pen 10 contacts the writing surface, the output of the switch SW provided in the vicinity of the contact position is updated from the L level to the H level. That is, when the tip of the pen 10 comes into contact with the position indicated by ◯ in FIG. 4, the output of the switch SW at this position is updated. As a result, the contact of the tip of the pen 10 with the writing surface and the position on the writing surface that has come into contact are found.

  Further, when the tip of the pen 10 moves in the X direction and / or Y direction on the writing surface, the output of the switch SW in the vicinity of the position before the movement is updated from the H level to the L level, and in the vicinity of the position after the movement. The switch SW is updated from L level to H level.

  When the pen 10 comes into contact with the writing surface, the CPU 34t provided in the ASIC 34 repeatedly detects the contact position of the tip of the pen 10, that is, the touch coordinates, based on the output of the matrix switch MSW. The detected touch coordinates are sequentially registered in a plurality of columns provided in the register 30 in the manner shown in FIG. The variable K is incremented from “0” every time the registration of touch coordinates is completed, and the registration destination column is identified by the variable K.

  Subsequently, the CPU 34t defines straight lines connecting the two touch coordinates respectively registered in the Kth column and the (K-1) th column of the register 30, and calculates the deflection angle of the defined straight line as “θt_K”. The deflection angle θt_K corresponds to the angle between the direction in which the defined straight line extends and the true north direction, and is calculated with reference to the output of the direction sensor 32 that detects the direction by magnetism.

  Further, the CPU 34t repeatedly acquires the detection result of the acceleration sensor 12 transferred from the pen 10 through the communication I / F 22, and calculates the declination angle of the tangent line in contact with the handwriting at the tip portion of the handwriting drawn by the pen 10 as “θp_K”. To do. The declination angle θp_K corresponds to an angle between the direction in which the tangent extends and the true north direction, and is calculated with reference to the detection result of the acceleration sensor 12 and the detection result of the azimuth sensor 32.

  Referring to FIG. 6, when the tip of the pen 10 that is in contact with the writing surface in the vicinity of the coordinate (X0, Y0) is moved diagonally upward to the right, the coordinate (X0, Y0) is registered in the 0th column of the register 30. The coordinates (X1, Y1) are registered in the first column of the register 30. The declination angles θt_1 and θp_1 have a magnitude that is based on the true north direction (= the diagonally downward right direction) and are calculated in response to detection of the coordinates (X1, Y1).

  Thereafter, the CPU 34t calculates, as “θpt_K”, an angle between the direction in which the tangent line in contact with the handwriting extends at the tip of the handwriting and the X-axis direction of the matrix switch MSW. The calculated angle θpt_K is registered in the Kth column of the register 30.

  When the handwriting drawn as shown in FIG. 6 is extended as shown in FIG. 7, the coordinates (X2, Y1), (X3, Y1) and (X4, Y2) follow the coordinates (X1, Y1). Is registered in the register 30. The angle θpt_1 is registered in the register 30 corresponding to the coordinates (X2, Y1), the angle θpt_2 is registered in the register 30 corresponding to the coordinates (X2, Y1), and the angle θpt_3 corresponds to the coordinates (X3, Y1). The angle θpt_4 is registered in the register 30 corresponding to the coordinates (X4, Y2).

  The CPU 24t also sets the start point coordinates each time the touch coordinates are registered in the register 30. If the registration destination of the touch coordinates is the 0th column of the register 30, the touch coordinates registered in the 0th column are set as the start point coordinates. On the other hand, if the touch coordinate registration destination is the column after the first column, the previous end point coordinate (= position correction history) is set as the start point coordinate.

  The variable L is incremented from “0” every time setting of the start point coordinates is completed, and the column of interest is identified by the variable L. The CPU 24t reads the touch coordinates from the Lth column of the register 30, and corrects the read Lth touch coordinates with reference to the angle θpt_L registered in the register 30. Specifically, an intersection of a straight line extending in the direction of the angle θpt_L from the start point coordinates set in the above manner and a straight line extending in the Y-axis direction from the X coordinate defining the Lth touch coordinate is detected, and the Lth The value of the Y coordinate that defines the touch coordinate is updated to the value of the Y coordinate at the detected intersection. The corrected touch coordinates are set as end point coordinates.

  The CPU 24t draws a line connecting the set start point coordinates and end point coordinates on the display device 28. The end point coordinate becomes the next start point coordinate every time the drawing process is completed. A series of processing from the setting of the start point coordinates to the drawing is repeatedly executed until the tip of the pen 10 is detached from the writing surface.

  Therefore, when handwriting is drawn in the manner shown in FIG. 7, the touch coordinates are moved to the coordinates indicated by ◯ shown in FIG. 8, and a straight line connecting the corrected touch coordinates is drawn. The display device 28 displays a straight line extending in parallel with the handwriting.

  The CPU 34t executes a plurality of tasks including an angle calculation task shown in FIG. 9, an angle registration task shown in FIG. 10, and a drawing processing task shown in FIG. Note that control programs corresponding to these tasks are stored in the ROM 34.

  First, it is determined based on the output of the touch panel 26 whether or not the pen 10 has touched the writing surface. When the determination result is updated from NO to YES, the process proceeds to step S3, and the detection result of the acceleration sensor 12 transferred from the pen 10 is acquired through the communication I / F 22. In step S5, it is determined whether or not an angle calculation request is issued from the angle registration task. If the determination result is NO, the process returns to step S1, while if the determination result is YES, the process returns to step S1 through steps S7 to S15. .

  In step S7, two touch coordinates respectively registered in the Kth column and the (K-1) th column of the register 30 are detected, and a straight line connecting the two detected touch coordinates is defined. In step S9, the deviation angle of the straight line defined in step S7 is calculated as “θt_K”. The deflection angle θt_K corresponds to an angle between the direction in which the defined straight line extends and the true north direction, and is calculated with reference to the detection result of the azimuth sensor 32.

  In step S11, the declination angle of the tangent line in contact with the handwriting at the tip of the handwriting drawn by the pen 10 is calculated as “θp_K”. The declination angle θp_K corresponds to an angle between the direction in which the tangent extends and the true north direction, and is calculated with reference to the detection result of the acceleration sensor 12 and the detection result of the azimuth sensor 32. In step S13, an angle between the direction in which the tangent noticed in step S11 extends and the X-axis direction of the matrix switch MSW is calculated as “θpt_K”. When the calculation is completed, a completion notification is issued for the angle registration task in step S15.

  Referring to FIG. 10, in step S <b> 21, it is determined based on the output of matrix switch MSW whether or not the tip of pen 10 has touched touch panel 26. If the determination result is NO, the flag FLGpen is set to “0” in a step S23. In the subsequent step S25, the register 30 is cleared and the variable K is set to “0”. When these processes are completed, the process returns to step S21.

  If the determination result of step S21 is YES, it will progress to step S27 and will detect the contact position of the front-end | tip of the pen 10, ie, a touch coordinate, based on the output of the matrix switch MSW. In the subsequent step S29, the detected touch coordinates are registered in the Kth column of the register 30.

  In step S31, it is determined whether or not the flag FLGpen indicates “0”. If the determination result is YES, the flag FLGpen is updated to “1” in a step S33, the variable K is incremented in a step S35, and then the process returns to the step S21.

  If the determination result in step S31 is NO, it is considered that two or more touch coordinates are registered in the register 30, and an angle calculation request is issued for the angle calculation task in step S37. In step S39, it is determined whether or not a completion notification is issued from the angle calculation task. When the determination result is updated from NO to YES, the process proceeds to step S41, and the angle θpt_K calculated by the angle calculation task is registered in the Kth column of the register 30. When registration is completed, the variable K is incremented in step S43, and then the process returns to step S21.

  Referring to FIG. 11, in a step S51, it is determined whether or not the flag FLGpen indicates “1”. If the determination result is NO, the variable L is set to “0” in step S53, and then the process returns to step S51. On the other hand, if the determination result is YES, the start point coordinates are set in step S55. If the variable L is “0”, the touch coordinates registered in the 0th column of the register 30 are set as the start point coordinates. On the other hand, if the variable L is “1” or more, the end point coordinates set by the previous processing of step S61 are set as the start point coordinates.

  When the setting of the start point coordinates is completed, the variable L is incremented in step S57. In step S59, the touch coordinates are read from the Lth column of the register 30, and the read Lth touch coordinates are corrected with reference to the angle θpt_L registered in the register 30. Specifically, the intersection of the straight line extending in the direction of the angle θpt_L from the start point coordinate set in step S55 and the straight line extending in the Y-axis direction from the X coordinate defining the Lth touch coordinate is detected, and the Lth touch The value of the Y coordinate that defines the coordinate is updated to the value of the Y coordinate at the detected intersection.

  In step S61, the touch coordinates corrected in this way are set as end point coordinates. In step S63, a line connecting the start point coordinates set in step S55 and the end point coordinates set in step S61 is drawn on the display device 38. When the drawing is completed, the process returns to step S51.

  As can be understood from the above description, the movement of the tip of the pen 10 is detected by the acceleration sensor 12 provided in the pen 10. Further, the X axis (= reference axis) is assigned to the writing surface, that is, the touch panel 26. The CPU 34t repeatedly detects the position on the writing surface where the tip of the pen 10 contacts as the touch coordinates (S27 to S29, S43), and detects the declination of the direction of movement detected by the acceleration sensor 12 with respect to the X axis. Calculation is performed based on the plurality of touch coordinates (S3 to S15, S37 to S43), and each of the detected plurality of touch coordinates is corrected based on the calculated declination (S55 to S61). Thereby, the reproducibility of handwriting can be improved while suppressing the load of the pen 10.

  In this embodiment, the multitask OS and control programs corresponding to a plurality of tasks executed thereby are stored in the ROM 34 in advance. However, a part of the control program may be prepared in the ROM 34 from the beginning as an internal control program, while another part of the control program may be acquired from an external server as an external control program. In this case, the external control program is acquired by the communication I / F 22, and the above-described operation is realized by the cooperation of the internal control program and the external control program.

  In this embodiment, the process executed by the CPU 24t is divided into a plurality of tasks as described above. However, each task may be further divided into a plurality of small tasks, and a part of the divided plurality of small tasks may be integrated with other tasks. Further, when each task is divided into a plurality of small tasks, all or part of the tasks may be acquired from an external server.

DESCRIPTION OF SYMBOLS 100 ... Handwriting input system 10 ... Writing instrument 12 ... Acceleration sensor 14, 32 ... Communication I / F
24t ... CPU
26 ... Touch panel 28 ... Display device 32 ... Direction sensor

Claims (9)

A writing input device that has a writing surface to which a reference axis is assigned and is written by a writing instrument having a detecting means for detecting the movement of the tip,
Position detecting means for repeatedly detecting the position on the writing surface with which the tip is in contact;
Deviation detection means for detecting a deviation angle of the direction of movement detected by the detection means with respect to the reference axis based on a detection result of the position detection means, and detecting the deviation angle by detecting the position detected by the position detection means A writing input device comprising position correcting means for correcting based on the declination detected by the means.   The declination detecting means includes first difference detecting means for detecting a difference between a direction of a line connecting a plurality of positions detected by the position detecting means and a reference direction, a direction of movement detected by the detecting means, and the direction of the movement Second difference detection means for detecting a difference from a reference direction, and detection processing for detecting the declination based on the difference detected by the first difference detection means and the difference detected by the second difference detection means The writing input device according to claim 1, comprising means. It further comprises azimuth detecting means for detecting the azimuth based on magnetism,
The writing input device according to claim 2, wherein the reference direction corresponds to an orientation detected by the orientation detection means.   The writing processing apparatus according to claim 1, wherein the position correction unit includes a correction processing unit that performs position correction based on the angle detected by the declination detection unit and the position correction history.   The writing processing apparatus according to claim 1, further comprising drawing means for drawing a line connecting the positions corrected by the position correction means on the writing surface. In a processor of a writing input device that has a writing surface to which a reference axis is assigned and is written by a writing instrument that includes a detecting means for detecting movement of the tip,
A position detection step of repeatedly detecting the position on the writing surface with which the tip is in contact;
A declination detecting step for detecting a declination of the direction of movement detected by the detecting means with respect to the reference axis based on a detection result of the position detecting step; and a declination detection of the position detected by the position detecting step. A writing input program for executing a position correction step for correcting based on the declination detected by the step. A writing input method executed by a writing input device having a writing surface to which a reference axis is assigned and written by a writing tool provided with a detecting means for detecting movement of the tip,
A position detection step of repeatedly detecting the position on the writing surface with which the tip is in contact;
A declination detecting step for detecting a declination of the direction of movement detected by the detecting means with respect to the reference axis based on a detection result of the position detecting step; and a declination detection of the position detected by the position detecting step. A writing input method comprising a position correction step of correcting based on a declination detected by the step. A writing surface to which a reference axis is assigned, and a processor that executes processing according to an internal control program stored in a memory, and is supplied to a writing input device that is written by a writing tool that includes a detecting means that detects movement of the tip. A control program,
A position detection step of repeatedly detecting the position on the writing surface with which the tip is in contact;
A declination detecting step for detecting a declination of the direction of movement detected by the detecting means with respect to the reference axis based on a detection result of the position detecting step; and a declination detection of the position detected by the position detecting step. An external control program for causing the processor to execute a position correction step for correcting based on the deflection angle detected in the step in cooperation with the internal control program. A writing surface to which a reference axis is assigned, a capturing unit that captures an external control program, and a processor that executes processing according to the external control program captured by the capturing unit and the internal control program stored in the memory. A writing input device written by a writing instrument comprising a detecting means for detecting
The external control program is
A position detection step of repeatedly detecting the position on the writing surface with which the tip is in contact;
A declination detecting step for detecting a declination of the direction of movement detected by the detecting means with respect to the reference axis based on a detection result of the position detecting step; and a declination detection of the position detected by the position detecting step. A writing input device corresponding to a program for executing a position correction step for correcting based on a declination detected by a step in cooperation with the internal control program.

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