KR101381707B1 - Jig for handwriting recognition, apparatus and method for handwriting recognition using jig - Google Patents

Abstract

Disclosed are a jig for handwriting recognition, a handwriting recognition apparatus and method using the jig. The present invention is capable of enhancing the handwriting motion recognition performance by determining whether a pen tip touches a writing surface based on a reference distance set using the marks on the writing surface and eliminating the false motions irrelevant to the handwriting motion to accurately recognize only the actual handwriting motion.

Description

Jig For Handwriting Recognition, Apparatus And Method For Handwriting Recognition Using Jig}

The present invention excludes false gestures irrelevant to the action of drawing or drawing using a writing instrument, and enables handwriting recognition jig and handwriting recognition using a jig to recognize an actual handwriting movement made when the pen tip is in contact with the writing surface. An apparatus and a method thereof are provided.

Currently, a pointing device used as an input device of an information device includes a track ball, a mouse, a keyboard, a touch screen panel, and a touch pad. In addition, digital pens, which are pen-type input devices, have evolved from the conventional mouse and keyboard forms as input devices of information devices.

In addition, it provides various conveniences by adding a function of transmitting, storing, processing, and displaying recording contents of a writing or picture written with a digital pen to an external terminal through wired or wireless communication.

In the pen-type input device, the coordinate transformation of the tip of the pen (pen tip) can be distinguished from the method of detecting the outside of the pen and the method of detecting the pen by itself. The type of detection outside the pen may use a triangulation method, an ultrasonic wave, or a method of detecting a change in the pen tip using a CCD camera. The method of detecting outside the pen has a problem that a recognition error is likely to occur when the pen is covered by a user's hand or the like during a writing operation.

In order for the digital pen to recognize the writing motion by itself, the motion recognition sensor for recognizing the movement of the pen includes an acceleration sensor or a gyro sensor, and information (coordinate value) corresponding to the writing position based on the sensor signal obtained from the sensor It requires a process to calculate.

In the prior art, various methods for improving the recognition ability of a writing operation have been proposed. In [Document 1], a pressure sensor is applied to detect whether the pen mouse is in contact with the bottom surface, and the pressure sensor serves to detect the pen pressure of the pen mouse so that an external terminal is used when writing or drawing according to the pen pressure. Techniques for reflecting on the screen are known.

The pen pressure can be detected through a pressure sensor capable of directly detecting a writing motion as in [Document 1], but since the pressure sensor is provided at one end of the writing member, the cost burden still remains, and the size of the pen pressure is also reduced. If it is not considered, it is difficult to recognize the writing motion by selecting the movement of the pen that is not in contact with the writing surface because the main focus is on the position of the pen mouse through the sensor unit.

Only when the pen tip is in contact with the writing surface of the paper is recognized as a writing operation, even if there is a movement of the pen, if the pen tip is not in contact with the writing surface, it is necessary to treat it as a false operation without actually writing. That is, the recognition ability may be improved by accurately identifying only the actual writing motion by excluding the movement of the pen which is not related to the writing motion.

In connection with the prior art including the prior art as described above, these and other problems are improved to reduce the burden of recognizing the handwriting motion with a simple configuration, and to quickly and accurately detect the contact on the writing surface to increase the recognition ability of the handwriting motion. To be able to do so.

[Document 1] Korean Patent Registration No. 10-1014574 (2011. 02. 16. notification)

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One aspect of the present invention is to determine whether the pen tip is in contact with the writing surface according to the reference distance set by using the marking on the writing surface to exclude the false operation irrelevant to the writing operation to accurately recognize only the actual writing movement. It is to increase the perception ability.

Handwriting recognition jig according to an embodiment of the present invention as described above, the body is detachably coupled to one side of the writing instrument, the body formed with a push projection on the outside to mark the mark by pressing on the writing surface; And a control module installed in the body and recognizing a writing operation by using a sensor unit for detecting a writing position that changes according to the movement of the pen tip of the writing instrument in contact with the writing surface.

In addition, the sensor unit may include a gyro sensor or an acceleration sensor, the body is made of a hexahedral shape receiving housing for receiving a portion of the writing instrument, and the fixing projection formed on the inner side of the receiving groove outside the writing instrument It is possible to form a guide groove that can be fitted or separated by indentation.

The control module may include a controller configured to control an overall operation for recognizing a writing operation using the measured coordinate information of the sensor unit, a storage unit configured to store the measured coordinate information of the sensor unit under control of the controller, Under the control of the control unit, a communication unit for transmitting the stored coordinate information to an external terminal, a display unit having a lamp for indicating the operation state of the writing instrument, and mode selection for inputting a user command for operation mode setting and power supply control. And an input unit including a switch and an operation switch, wherein the input unit may include an operation switch pressed by one side of the writing instrument when the control module is installed in the body.

The controller may be further configured to set a reference distance corresponding to the length of the writing instrument in a reference coordinate system in which a coordinate value of the sensor unit is transformed based on the mark formed by the jig, and located above the writing surface. A reference angle satisfying the height to the writing surface and the reference distance is calculated at a corresponding point, and the result of comparing the inclination angle of the writing instrument obtained by double integration of the coordinate values of the sensor unit with the calculated reference angle. Accordingly, it is possible to exclude a false operation in which the pen tip of the writing instrument does not touch the writing surface, and control the operation of storing or transmitting the measured coordinate information of the sensor unit to an external terminal with respect to the actual writing operation.

In addition, when the reference coordinate system is set on the writing surface 1 and then moved from the writing surface 1 to the writing surface 2, the control unit resets the reference coordinate system by correcting the origin of the reference coordinate system, and uses the reset reference coordinate system. The writing motion on the moved writing surface 2 may be recognized.

Also, when a start command and a stop command for measuring distance on a writing surface are received through the input unit, the controller uses coordinates of a start point corresponding to the input of the start command and coordinates of an end point corresponding to the input of the end command. To measure the distance between two points away from each other.

Handwriting recognition device using a jig according to an embodiment of the present invention as described above, Writing instruments extending in the longitudinal direction to write; A jig detachably coupled to one side of the writing instrument and forming a pressing protrusion on an outer side of the writing instrument to mark the mark by pressing on the writing surface; And a control module installed in the writing instrument and recognizing a writing operation using a sensor unit for detecting a writing position which changes according to the movement of the pen tip of the writing instrument contacting the writing surface.

In addition, the jig, the receiving groove for accommodating a part of the writing instrument on one side of the body of the hexahedral shape, and the guide groove which can be inserted or separated by a pressing projection formed on the outer surface of the writing instrument on the inner surface of the receiving groove. The control module may include a controller configured to control an overall operation for recognizing a writing operation by using the measured coordinate information of the sensor unit, and to store the measured coordinate information of the sensor unit under the control of the controller. And a display unit including a communication unit for transmitting the stored coordinate information to an external terminal under control of the controller, a display unit having a lamp indicating an operation state of the handwriting recognition device, and a user command for operation mode setting and power supply control. And an input unit having a mode selection switch and an operation switch for inputting the sensor, wherein the sensor unit is a gyro sensor. Or it may comprise an acceleration sensor.

The controller may be further configured to set a reference distance corresponding to the length of the writing instrument in a reference coordinate system in which a coordinate value of the sensor unit is transformed based on the mark formed by the jig, and located above the writing surface. A reference angle satisfying the height to the writing surface and the reference distance is calculated at a corresponding point, and the result of comparing the inclination angle of the writing instrument obtained by double integration of the coordinate values of the sensor unit with the calculated reference angle. Accordingly, it is possible to exclude a false operation in which the pen tip of the writing instrument does not touch the writing surface, and control the operation of storing or transmitting the measured coordinate information of the sensor unit to an external terminal with respect to the actual writing operation.

In the handwriting recognition method according to the embodiment of the present invention as described above, in the initialization mode, a jig that can be attached to or detached from the writing instrument is placed on a writing surface, and the coordinate value measured by the sensor unit is converted to coordinates to set a reference coordinate system, and the jig Pressing to mark the writing surface; Calculating a reference length corresponding to the length of the writing instrument using the coordinate values of the sensor unit while the writing instrument is standing on the mark; Storing the calculated reference distance to complete initialization; Calculating a reference angle satisfying the height to the writing surface and the reference distance at an arbitrary point corresponding to the sensor unit positioned above the writing surface in the activation mode; Measuring an inclination angle of the writing instrument by integrating the coordinate values of the sensor unit at the arbitrary point; Comparing the inclination angle of the measured writing instrument with the calculated reference angle; When the inclination angle of the writing instrument coincides with the reference angle, the pen tip of the writing instrument is in contact with the writing surface, and is recognized as an actual writing operation. The coordinate information of the writing instrument is stored and transmitted to an external terminal through a communication unit. And visually displaying the handwriting content in the external terminal so as to be confirmed.

In the setting of the reference distance, the reference distance may be set by correcting a height of the sensor part away from the writing surface.

In addition, after marking the mark on the writing surface 1 and setting the reference coordinate system using the marked marking, the position is changed from the writing surface 1 to the writing surface 2, the mark formed on the writing surface 2 coincides with the pressing protrusion of the jig. The reference coordinate system may be corrected by using the coordinates obtained by using the coordinates, and the continuity of handwriting recognition may be maintained by resetting the reference coordinate system and recognizing the writing operation using the reset reference coordinate system.

As described above, the present invention can enhance the recognition ability of the writing operation by accurately recognizing only the actual writing operation by excluding a false operation made in a state of not contacting the writing surface even if there is a movement of the writing.

In addition, the present invention can recognize a writing operation using a writing recognition jig that can be easily mounted on a general writing instrument.

In addition, since the present invention uses a jig of a simple configuration, the cost is low, and the jig can be easily separated or combined from the writing instrument, thereby reducing the inconvenience of using the jig.

In addition, the present invention can easily select the initialization mode performed before the writing operation and the activation mode for recognizing the writing operation by operating the mode selection switch of the writing instrument can reduce the inconvenience of the mode selection and increase the ease of use.

In addition, the present invention can maintain the continuity of handwriting recognition by correcting the origin of the reference coordinate system according to the position of the writing surface even if the writing surface is moved in the recognition process of the writing operation.

In addition, the present invention can calculate the distance between the points away from the writing surface in addition to the handwriting recognition function can be used as an auxiliary function.

1A is a block diagram of a writing recognition device using a jig according to an embodiment of the present invention.
1B is a view for explaining a handwriting recognition jig according to another embodiment of the present invention.
2 is a control block diagram of a control module according to an embodiment of the present invention.
3 is a view for explaining the operation of the initialization mode according to an embodiment of the present invention, Figure 3a is a view showing a case where the jig is placed on the writing surface, Figure 3b is a view showing the marking on the writing surface 3C is a diagram illustrating an operation of measuring a reference distance by standing a pen tip at a reference point of a mark.
4 is a view for explaining an operation of recognizing a writing motion in an activation mode according to an embodiment of the present invention. 4B is a diagram illustrating a case in which the pen tip is not in contact with the writing surface and thus the currently measured separation distance does not coincide with the calculated reference distance.
5A and 5B are flowcharts illustrating a handwriting recognition method according to an embodiment of the present invention.
6 is a view for explaining an operation of correcting the origin corresponding to the position of the writing surface according to an embodiment of the present invention.
7 is a view for explaining a distance measurement function according to an embodiment of the present invention.

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

As can be seen in Figure 1a, the writing recognition device 1 using a jig according to an embodiment of the present invention is coupled to the writing instrument 10 and the writing instrument 10 extending in the longitudinal direction so as to hold and write by hand Jig 30 having a hexahedron shape, and a control module for controlling the operation of measuring the writing position and processing and storing the measured coordinate information. Herein, it should be noted that the control module encompasses the overall components for recognizing the writing operation and collectively represents the input unit, the control unit, the sensor unit, the communication unit, and the storage unit described later.

The writing instrument 10 includes a body 11 accommodating the ink cartridge 14 therein, a mode selection switch 12 installed outside the body 11, an operation switch 17, and an indicator lamp 13.

The ink cartridge 14 has a pen tip 15 attached to one end thereof, and the pen tip 15 is exposed to the outside of the body 11. The illustrated ink cartridge 14 exemplarily shows general components, and it should be noted that the shape and size of the ink cartridge 14 and the ink material are not specified.

The mode selection switch 12 outputs a mode selection signal by varying an electrical contact according to a user's operation for selecting an operation mode, wherein the operation mode recognizes an initialization mode performed before recognizing a writing operation and a writing operation. It can be divided into an activation mode for performing the above, and a communication mode for transmitting the coordinate information obtained according to the handwriting operation to the external terminal.

The mode selection switch 12 can be slidably installed on the outside of the body 11 to easily move the position of the mode selection switch 12 with one hand. The mode of operation of the mode selection switch 12 is also a general configuration. As an example of an element, various methods of selecting a mode according to an operation by a user may be adopted, such as a button method of selecting a corresponding operation mode by a pressing operation.

The operation button 17 may perform a role of inputting a user command such as performing an initialization operation or controlling a power supply to set one of power on and off.

In the exemplary embodiment, the mode selection switch 12 and the operation button 17 are separately configured. However, the mode selection switch 12 and the operation button 17 may be separately implemented.

The indicator lamp 13 may be implemented as at least one LED as a display device for instructing a user of status information, such as mode setting, writing operation, and charging / discharging of power. Various status information can be instructed by turning on / off, flashing, lighting color of the indicating lamp 13, and the number and color of the LEDs can be appropriately changed according to the use conditions.

A cap 11a covering one side of the body is coupled to the upper end of the body 11. The body 11 and the cap 11a may be coupled to each other by press-fitting or using a male and female screw structure, and the coupling structure of the body 11 and the cap 11a may be used to replace or repair an electrical component housed therein. It is desirable to apply a structure that can be easily separated for.

Inside the body 11 and the cap 11a, electrical components including a sensor unit 21, a power supply unit 22, a control unit 24, a communication unit 25, a storage unit 27, and the like are installed. The sensor unit 21 includes a three-axis acceleration sensor or a gyro sensor, and the power supply unit 22 independently includes a battery or a secondary battery for providing driving power.

Jig 30 is a receiving body 31 is formed concave to a certain depth on one side of the body (30a) and the body (30a) of the hexahedral shape. A part of the cap 11a may be fitted into the receiving groove 31. That is, when the cap 11a is pushed into the receiving groove 31, the fixing protrusion 16 protruding from the outside of the cap 11a is tightly fitted into the guide groove 32 recessed in the inner surface of the receiving groove 31. .

A plurality of push protrusions 33 are formed on the outer bottom surface of the jig 30. The plurality of push protrusions 33 are located at four corners and at the center, respectively. On the writing surface of the paper material, the bottom surface of the jig 30 is placed and pressed, and the marks pressed by the plurality of push protrusions 33 remain.

The handwriting recognition device 1 according to the above-described embodiment includes an electric component including the sensor unit 21, the power supply unit 22, the control unit 24, the communication unit 25, the storage unit 27, and the like in the writing instrument 10. Installed, the jig 30 is simply implemented by inserting one side of the writing instrument 10 to fix and focus on the role of making a mark on the writing surface using the pressing projection (33).

According to another embodiment to be described later, by using a handwriting recognition jig provided with electrical components for recognizing a handwriting operation proposes a technique that can be applied to a general writing instrument.

FIG. 1B is a view for explaining a handwriting recognition jig according to another embodiment of the present invention, and the same or similar components in the configuration and function of the above-described embodiment will be described with reference to the same reference numerals.

As shown, the handwriting recognition jig 30-1 may be fitted to one side of a typical writing instrument 10a capable of drawing or drawing on a writing surface, and may be configured by embedding electrical components for handwriting recognition.

The writing instrument 10a is composed of a body 11 and a cap 11a coupled to the body 11, the body 11 accommodates an ink cartridge 14 therein, and the pen tip 15 has a body 11. Can be exposed out.

Although the fixing protrusion 16 may be formed on the outside of the cap 11a in the writing recognition jig 30-1, the method of fastening the cap 11a to the writing recognition jig 30-1 may be performed. There is no need to specifically limit, and for example, the fixing protrusion 16 is not formed, so that a fastening structure for tightly inserting or removing the smooth cap 11a from the writing recognition jig 30-1 may be applied.

The writing recognition jig 30-1 forms a receiving body 31 with a predetermined depth in the body 30a having a hexahedron shape and the body 30a. A recessed guide groove 32 may be formed on the inner side of the receiving groove 31 so as to fit the fixing protrusion 16, but the cap 11a does not have the fixing protrusion 16 on the inner side of the receiving groove 31. The outer side can also be press-fitted in or out.

In the receiving groove 31 is provided with an operation switch 17a which is supported by the elastic spring 18 and pressed by one end of the cap 11a, the operation switch 17a is pushed by the electrical contact 19. Electrical connection or interruption to provide an electrical signal to the control unit 24. Here, the operation switch 17a may return to its original position by the elastic force of the elastic spring 18 when the external force due to the pressing operation is not applied. Accordingly, since the control unit 24 can recognize the electrical signal provided according to the position of the operation switch 17a as a user command, the operation switch 17a has a function corresponding to the operation switch 17 of the above-described embodiment. You can have it.

The writing jig 30-1 includes a sensor unit 21, a power supply unit 22, a control unit 24, a communication unit 25, and a storage unit 27, and these components include the writing recognition device described above ( Functions the same as the corresponding component provided in the writing instrument 10 of 1).

In addition, the writing recognition jig 30-1 includes a mode selection switch 12 and an indication lamp 13 installed to be exposed to the outside, and these components are the writing instruments 10 of the writing recognition device 1 described above. It performs the same function as the corresponding component provided in).

In addition, a plurality of push protrusions 33 are formed on the outer bottom of the writing recognition jig 30-1.

According to embodiments, the handwriting content may be visually confirmed by transmitting the coordinate information measured through the sensor unit 21 to an external communication terminal.

The control module is provided in the writing recognition jig 30-1 or the writing instrument 10.

As illustrated in FIG. 2, the control module includes an input unit 20, a sensor unit 21, and a power supply unit 22, which are electrically connected to an input terminal of the control unit 24, and are electrically connected to an output terminal of the control unit 24. And a communication unit 25, a display unit 26, and a storage unit 27 connected to each other.

The input unit 20 includes a mode selection switch 12 and operation switches 17 and 17a, and provides a signal to the controller 24 according to the operation of each switch. The sensor unit 21 is implemented as a 3-axis acceleration sensor or a gyro sensor, and provides the controller 24 with values measured for three axes of the x-axis, y-axis, and z-axis.

The storage unit 27 stores the information on the reference distance calculated by the control unit 24 in the initialization mode. Here, the reference distance is used to determine whether the pen tip 15 is in contact with the writing surface to select a false operation in which the actual writing operation is not performed, which will be described later with reference to FIG. 3.

In addition, the storage unit 27 stores measurement coordinate information of the sensor unit 21 according to the writing position in the activation mode, and the measured coordinate information of the stored writing position is externally communicated through the communication unit 25 under the control of the controller 24. Is transmitted to the terminal 40. The external terminal 40 displays on the screen using the measurement coordinate information of the writing position obtained by the control module so that the user can check the writing contents.

The power supply unit 22 provides driving power required by each component under the control of the control unit 24. The display unit 26 includes an indicator lamp 13 that operates under the control of the control unit 24. Unlike the exemplary embodiment, the display unit 26 may further include a liquid crystal display not shown separately from the indicator lamp 13, or may include a liquid crystal display instead of the indicator lamp 13.

Since the pen tip 15 and the sensor unit 21 of the writing instrument 10 or 10a maintain a predetermined interval, the length of the pen tip 15 and the sensor unit 21 is set as a reference distance, and then the reference distance is used. It may be determined whether the pen tip 15 is in contact with the writing surface.

The process of setting the reference distance will be described in detail with reference to the accompanying drawings, and thus the same applies to the embodiments, the following description will be given with reference to the handwriting recognition device 1 using the jig according to FIG. 1A.

As shown in FIG. 3A, the jig 30 coupled to the writing instrument 10 is placed on the writing surface. A plurality of pressing protrusions 33 protruding from the bottom surface of the jig 30 are in contact with the writing surface. In the state where the jig 30 is positioned on the writing surface, the controller 24 coordinates the 3-axis coordinate values (x ₀ , y ₀ , z ₀ ) measured by the sensor unit 21 to the reference point (0,0,0). The reference coordinate system is set to convert the reference point (0, 0, 0) as the origin. Here, the three-axis coordinate values (x ₀ , y ₀ , z ₀ ) measured by the sensor unit 21 may be corrected by the height A of the writing surface and the sensor unit 21 to determine the reference point.

Then, when the user presses the jig 30, as shown in Fig. 3b, the writing surface is pressed by a plurality of push projections 33, and these markings are four corner marks P1, P2, P3, P4) and a central mark P0 which is equidistant from these edge marks.

As shown in FIG. 3C, the pen tip 15 is positioned in the center mark P0 to stand vertically. In this state, when the coordinate values (x ₀ , y ₀ , z ₁ ) measured by the sensor unit 21 are transformed in the reference coordinate system, the coordinates (0, 0, L) of the X and Y axes are equal to the reference point. do.

The controller 24 may calculate the reference distance Lr corresponding to the length of the writing instrument 10 using the coordinate information of the sensor unit 21 measured in FIGS. 3A and 3C, respectively. . That is, the reference distance is calculated according to the difference of the z-axis coordinate values. Then, the controller 24 stores the reference distance Lr in the storage unit 27.

After setting the reference distance Lr in the initialization mode, it may be determined whether the pen tip 15 is in contact with the writing surface, which will be described in detail.

Referring to FIG. 4A, when the sensor unit 21 of the writing instrument 10 is positioned at an arbitrary point on the two-dimensional writing surface, the three-axis coordinate values (x, y, z) measured by the sensor unit 21 are measured. Coordinates in the reference coordinate system to calculate the vertical height (Δz) in the normal direction with respect to the writing surface, and from the measured three-axis coordinate value (x, y, z) to the writing surface at an arbitrary distance from the reference distance (Lr) A reference angle R at which a straight line connecting the points a, b, 0 and a vertical line in the normal direction toward the writing surface intersects is calculated from the three-axis coordinate values (x, y, z). Here, a random point (a, b, 0) is a triangle consisting of a reference point (0, 0, 0), three-axis coordinate values (x, y, z) and a point (x, y, 0) projected in the normal direction and its Since the angle is known, it can be calculated using triangulation.

Then, the inclination angle of the actual writing instrument 10 is calculated by double-integrating the angular velocity with respect to each axis by using the three-axis coordinate values (x, y, z), and the calculated inclination angle is the reference angle (R). In other words, the pen tip 15 is recognized as being in contact with the writing surface. When the pen tip 15 touches the writing surface, the actual writing operation is performed. Therefore, the measured coordinate information of the sensor unit 21 that changes according to the writing position is stored in the storage unit 27, and the sin table stored in the storage unit 27 is stored. Information may be transmitted to an external terminal through the communication unit 25.

On the other hand, as can be seen in Figure 4b, the three-axis coordinate value (x, y, z) measured by the sensor unit 21 coordinate transformation in the reference coordinate system in the normal direction to the writing surface of the two-dimensional xy plane The reference angle R is calculated in the same manner as in the height Δz and FIG. 4A. Then, by integrating the angular velocity with respect to the three-axis coordinate values (x, y, z) to calculate the tilt angle of the actual writing implement 10, and if the calculated tilt angle does not match the reference angle (R), the pen tip 15, it is recognized as not being in contact with the writing surface. At this time, the controller 24 does not store the measurement coordinate information of the sensor unit 21 in the storage unit 27 because an actual writing operation is not performed.

Hereinafter, a handwriting recognition method will be described with reference to the accompanying drawings.

5A and 5B, when the operation switch 17 is pressed by the user, the power is turned on and the mode selection switch 12 is operated to select any one of an initialization mode, an activation mode, and a communication mode (100). ).

When the initialization mode is selected (YES in 102), the user inserts the writing instrument 10 into the receiving groove 31 of the jig 30 and then contacts the bottom surface of the jig 30 on the two-dimensional writing surface made of paper. When the operation switch 17 is pressed, the control unit 24 sets a reference coordinate system using the measured coordinate values of the sensor unit 21 at the position of the jig 30 placed on the writing surface, and sets this reference point as the reference point. (104).

Subsequently, when the user presses the jig 30, the markings of the plurality of marks P0, P1, P2, P3, and P4 corresponding to the plurality of pressing protrusions 33 are pressed as the pressing protrusions 33 of the jig 30 press the writing surface. This writing surface is marked (106). The marked marker consists of edge marks P1, P2, P3, P4 corresponding to four corners and a central mark P0 located equidistant from them.

After the marking is marked on the writing surface, the writing instrument 10 is turned upside down and the pen tip 15 is positioned perpendicular to the central mark P0. Then, when the operation button 17 is pressed, the control unit 24 calculates a reference distance Lr using the three-axis coordinate value of the sensor unit 21 (108). Here, considering that the measurement coordinate value of the sensor unit 21 does not exist on the writing surface, the error is generated, and as shown in FIG. 3A, the correction is performed by the vertical height A between the writing surface and the sensor unit 21. Set the reference distance Lr.

Then, the controller 24 ends the initialization mode by storing the set reference distance Lr in the storage unit 27 (110).

On the other hand, when the activation mode is selected by the user (Yes of 112), the control unit 24 coordinates in the reference coordinate system with respect to the 3-axis coordinate value of the sensor unit 21 when writing with the writing instrument 10 at any point on the writing surface. By converting, the vertical height DELTA z in the normal direction with respect to the writing surface is calculated (114). Next, a straight line connecting an arbitrary point away from the measured 3-axis coordinate value (x, y, z) toward the writing surface by the reference distance (Lr) and a vertical line facing the writing surface at the 3-axis coordinate value (x, y, z) This crossing reference angle R is calculated (116). In addition, the control unit 24 calculates the inclination angle of the writing instrument by double-integrating the acceleration for each axis (118).

If the inclination angle of the writing instrument coincides with the reference angle R (Yes of 120), as illustrated in FIG. 4A, the pen tip 15 is recognized as being in contact with the writing surface, and the control unit 24 determines the writing position. The measured coordinate information of the sensor unit 21 that changes accordingly is stored in the storage unit 27 (122). The external terminal receiving the measurement coordinate information may be converted into a text or a picture according to the handwriting operation and visually displayed on the screen.

If the inclination angle of the writing instrument does not coincide with the reference angle R (NO of 120), as illustrated in FIG. 4B, the pen tip 15 does not come into contact with the writing surface, even if there is a movement of the writing instrument, as shown in FIG. 4B. The controller 24 does not store the measured coordinate information of the sensor unit 21 in the storage unit 27 because it is recognized as an operation (124). Unlike the exemplary embodiment, the measurement coordinate information of the sensor unit 21 for the false operation may be stored in the storage unit 27, and the coordinate information of the false operation may be provided to the external terminal 40 to visually indicate the writing operation. It can also be applied to adjust the thickness.

On the other hand, when the communication mode is selected by the user (Yes of 126), the controller 24 controls the communication unit 25 to transmit the measurement coordinate information according to the writing operation stored in the storage unit 27 to the external terminal (128). .

6 is a view for explaining an operation of correcting the origin corresponding to the position of the writing surface according to an embodiment of the present invention.

A reference coordinate system is set for the writing surface 1 by using the handwriting recognition device 1 (1a) using the jig according to the present invention, and the setting process of the reference coordinate system is as described above in detail.

By setting the reference coordinate system as described above, the user can move the writing surface in the process of recognizing the writing operation by the writing instrument 10 or 10a. For the continuity of the writing recognition, the reference coordinate system must be changed to correspond to the position of the writing surface. .

As shown in FIG. 6, when the marking surface corresponding to the plurality of push protrusions is formed on the writing surface 1 to set the reference coordinate system, and then the writing surface is moved from the writing surface 1 to the writing surface 2, the writing instrument in FIG. 1A ( The pressing protrusion 33 of the jig 30 mounted on the 10) is positioned to match the mark already formed on the writing surface 2. Also, the writing recognition jig 30-1 in FIG. 1B is positioned to match the mark already formed on the writing surface 2. That is, the plurality of push protrusions 33 coincide with the plurality of marks P0, P1, P2, P3, and P4.

Then, the controller 24 corrects the 3-axis coordinate information measured by the sensor unit 21 to a new origin and resets the reference coordinate system. After that, it is possible to recognize the motion written by the writing instruments 10 and 10a using the reset reference coordinate system.

7 is a view for explaining a distance measurement function according to an embodiment of the present invention.

After the marker is formed on the writing surface and the reference coordinate system is set, the writing operation can be recognized. In addition to the writing operation, the distance from the writing surface needs to be measured. In this case, a method of simply measuring the distance between two points using the writing instruments 10 and 10a will be described. In the state where the pen tip 15 is located at the starting point, the activation command of the distance measuring function is input to the controller 24. Then, with the pen tip 15 positioned at the endpoint, enter the end command of the distance measurement function. The input of the activation command and the termination command may be input by the user through the mode selection switch 12 or the operation switch 17 or may be provided to the controller 24 by installing a separate switch.

Then, the controller 24 obtains the coordinates (x1, y1, 0) of the starting point and the coordinates (x2, y2, 0) of the end point through the sensor unit 21, and calculates the distance using the coordinates of these two points. have. The calculated distance measurement information is transmitted to the external terminal 40 through the communication unit 25, and the user can confirm the measured distance through the screen of the external terminal 40.

10, 10a: writing instruments
14: ink cartridge
15: pen tip
30: Jig
30-1: Handwriting Recognition Jig
33: push protrusion

Claims (12)

Removably coupled to one side of the writing instrument, the body formed with a push protrusion on the outside to mark the mark by pressing on the writing surface, and
And a control module installed in the body and using a sensor unit for detecting a writing position which changes according to the movement of the pen tip of the writing instrument in contact with the writing surface. In claim 1,
The sensor unit includes a gyro sensor or an acceleration sensor,
The body has a hexahedral shape and the receiving groove for receiving a portion of the writing instrument, and the receiving groove formed on the inner surface of the guide groove which can be inserted or separated by a pressing projection formed on the outside of the writing instrument Handwriting recognition jig. In claim 1,
The control module may include a controller configured to control an overall operation for recognizing a writing operation using the measured coordinate information of the sensor unit, a storage unit configured to store the measured coordinate information of the sensor unit under control of the controller, and A control unit for transmitting the stored coordinate information to an external terminal under control, a display unit having a lamp indicating an operating state of the writing instrument, a mode selection switch for inputting a user command for operation mode setting and power supply control; An input having an operation switch,
The input unit jig for writing recognition, characterized in that it comprises an operation switch that is pressed by one side of the writing instrument when the control module is installed in the body. 4. The method of claim 3,
The controller may be configured to set a reference distance corresponding to the length of the writing instrument in a reference coordinate system in which a coordinate value of the sensor unit is transformed based on the mark formed by the jig, and located above the writing surface to correspond to the sensor unit. A reference angle satisfying the height to the writing surface and the reference distance at an arbitrary point is calculated, and the inclination angle of the writing instrument obtained by double integration of the coordinate values of the sensor unit is compared with the calculated reference angle. The handwriting recognition jig, which excludes a false operation in which the pen tip of the writing instrument does not touch a writing surface, and controls the operation of storing or transmitting the measured coordinate information of the sensor unit to an external terminal with respect to the actual writing operation. 5. The method of claim 4,
When the reference coordinate system is set in writing surface 1 and then moved from writing surface 1 to writing surface 2, the control unit resets the reference coordinate system by correcting the origin of the reference coordinate system, and moves using the reset reference coordinate system. The handwriting recognition jig, which recognizes the handwriting motion on the writing surface 2. 5. The method of claim 4,
When receiving a start command and a stop command for measuring a distance from a writing surface through the input unit, the controller uses the coordinates of the start point corresponding to the input of the start command and the coordinates of the end point corresponding to the input of the end command. Handwriting recognition jig characterized by measuring the distance of two points apart. Writing instruments extended in the longitudinal direction for writing,
The jig detachably coupled to one side of the writing instrument, and formed with a push protrusion on the outside to mark the mark by pressing on the writing surface, and
The handwriting recognition device using a jig, which is installed in the writing instrument and comprises a control module for recognizing a writing operation using a sensor unit for detecting a writing position that changes according to the movement of the pen tip of the writing instrument contacting the writing surface. . 8. The method of claim 7,
The jig has a receiving groove for accommodating a portion of the writing instrument on one side of the body having a hexahedron shape, and a guide groove for inserting or detaching a fixing protrusion formed at an outer side of the writing instrument on the inner side of the receiving groove by press-fitting. and,
The control module may include a controller configured to control an overall operation for recognizing a writing operation using the measured coordinate information of the sensor unit, a storage unit configured to store the measured coordinate information of the sensor unit under control of the controller, and Under the control, a communication unit for transmitting the stored coordinate information to an external terminal, a display unit having a lamp indicating an operating state of the handwriting recognition device, and a mode selection for inputting a user command for operation mode setting and power supply control. An input having a switch and an operating switch,
The sensor unit is a handwriting recognition device using a jig characterized in that it comprises a gyro sensor or an acceleration sensor. 9. The method of claim 8,
The controller may be configured to set a reference distance corresponding to the length of the writing instrument in a reference coordinate system in which a coordinate value of the sensor unit is transformed based on the mark formed by the jig, and located above the writing surface to correspond to the sensor unit. A reference angle satisfying the height to the writing surface and the reference distance at an arbitrary point is calculated, and the inclination angle of the writing instrument obtained by double integration of the coordinate values of the sensor unit is compared with the calculated reference angle. Handwriting recognition using a jig, characterized in that the pen tip of the writing instrument does not touch the writing surface, and the control of storing or transmitting the measured coordinate information of the sensor unit to an external terminal with respect to the actual writing operation. Device. In the initialization mode, the jig detachable to the writing instrument is placed on the writing surface, and the coordinate value measured by the sensor unit is converted to set a reference coordinate system, and pressing the jig to mark the marking on the writing surface,
Calculating a reference length corresponding to the length of the writing instrument by using the coordinate value of the sensor unit while the writing instrument is standing on the mark,
Storing the calculated reference distance to complete initialization;
Calculating a reference angle satisfying the height to the writing surface and the reference distance at an arbitrary point corresponding to the sensor unit positioned above the writing surface in the activation mode;
Measuring the inclination angle of the writing instrument by integrating the coordinate values of the sensor unit at the arbitrary point;
Comparing the inclination angle of the measured writing instrument with the calculated reference angle, and
When the inclination angle of the writing instrument coincides with the reference angle, the pen tip of the writing instrument is in contact with the writing surface, and is recognized as an actual writing operation. The coordinate information of the writing instrument is stored and transmitted to an external terminal through a communication unit. Handwriting recognition method using a jig characterized in that it comprises the step of visually displaying the handwriting content in the external terminal so as to confirm. 11. The method of claim 10,
The reference distance setting step is a handwriting recognition method using a jig, characterized in that for setting the reference distance by correcting the height of the sensor unit away from the writing surface. 11. The method of claim 10,
Marking the mark on the writing surface 1, and after setting the reference coordinate system using the marked marking, the position is changed from the writing surface 1 to the writing surface 2, obtained by matching the push projection of the jig to the mark already formed on the writing surface 2 Rectifying the origin of the reference coordinate system by using coordinates to reset the reference coordinate system, and recognizes the handwriting operation using the reset reference coordinate system to maintain the continuity of the handwriting recognition method.

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