JP2015056101A - Handwriting input device, control program, and control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reproduce variation in density, bleeding, and blurring at the time of handwriting on a sheet of paper with an ink brush from handwriting information on a touch panel.SOLUTION: A handwriting input device includes: a touch panel which has electrodes arrayed in mutually orthogonal directions and is capable of simultaneously detecting depressions at intersections between the electrodes; a pressure value calculation unit which acquires pressure values at respective intersections from the touch panel at intervals of a preliminarily determined time and integrates the pressure values within a prescribed time to calculate a total pressure value at each of the intersections; an output value calculation unit which specifies output positions of an output unit corresponding to the intersections respectively and calculates output values defining densities in respective output positions on the basis of the total pressure values of respective intersections; and an output control unit which outputs the output positions and the output values for the output positions to the output unit in association with each other.

Description

  The present invention relates to a handwriting input device, a control program, and a control method, and more particularly, to a handwriting input device including a touch panel capable of simultaneously detecting a plurality of points, and a control program and a control method for appropriately reproducing information handwritten on the handwriting input device.

  In recent years, a handwriting input device such as a tablet including a touch panel having a display function has become widespread. In this handwriting input device, information (hereinafter referred to as handwritten information) such as characters and figures handwritten with a pen or a finger on the touch panel can be displayed on the touch panel, or stored or output as electronic data. . In addition, a handwriting input device (so-called binder-type handwriting input device) in which paper is fixed on a touch panel having no display function and handwritten information handwritten on the paper can be stored or output as electronic data is also on the market. In addition, with respect to such a handwriting input device, a method for displaying handwritten information in a form as when handwritten with a brush on paper has been proposed in order to improve the appearance of the handwritten information.

  For example, in Patent Document 1 below, a pressure detection unit that detects a pressure when the coordinate input unit inputs coordinates to the coordinate input surface, and a size of the drawing pattern according to the pressure detected by the pressure detection unit. Enlargement / reduction means for enlarging or reducing the image, movement direction calculation means for calculating the movement direction of the coordinate input means based on the coordinate values sequentially detected by the coordinate value detection means, and the direction of movement calculated by the movement direction calculation means A drawing pattern rotation unit for rotating the drawing pattern so that the writing tip portion of the drawing pattern faces in the opposite direction, a distance interval calculating unit for calculating a distance between adjacent coordinate values sequentially detected by the coordinate value detecting unit, and a distance A rotation control unit that controls the drawing pattern rotation unit based on the distance between the coordinate values calculated by the interval calculation unit and reduces the rotation amount of the drawing pattern; There is disclosed a brush writing apparatus comprising: a drawing unit that sequentially draws a drawing pattern rotated by a tongue rotating unit or a rotation control unit and enlarged or reduced by an enlargement / reduction unit at a coordinate position detected by a coordinate value detection unit. ing.

  Patent Document 2 listed below includes an input unit that functions as a brush in a drawing action and that can detect coordinates on its own movement path; a drawing information processing unit that processes drawing action information from the input unit; In the drawing information processing apparatus including the display unit for displaying the processing result, the drawing information processing unit includes a drawing information processing control unit that controls functions of the entire processing in the drawing information processing unit, and a paint information processing unit on the brush. A drawing information generation unit for managing a paint value corresponding to the amount, a paint fixing state simulator for simulating the coating of the paint on the object based on the drawing action information from the input unit and the paint value of the drawing information generation unit; A drawing information processing apparatus including a display control unit that displays a result of a paint fixing state simulator on a display unit is disclosed.

  Moreover, although it is not a technique regarding a handwriting input device, regarding the technique of generating an image as when drawn with a brush, for example, in Patent Document 3 below, a plurality of capillaries are bundled into a brush shape and each of these Displacement measurement unit that measures and outputs the displacement amount and displacement direction at any position of the capillary tube, and a brush type that is configured to place a strain measurement unit that measures and outputs strain on each capillary tube An information input device is disclosed.

JP 2004-139411 A JP 07-21235 A Japanese Patent Laid-Open No. 05-204537

  The touch panel detects a change in physical quantity at a point where electrodes arranged in directions orthogonal to each other (hereinafter referred to as an intersection) are detected. As a detection method thereof, a capacitance method, an electromagnetic induction method, a digital method, or the like. A resistance film system is known. Among the detection methods, the capacitance method and the electromagnetic induction method can acquire only one representative output value in the touch area with respect to the touch of the pen or finger, and the handwritten input information is: It is expressed as a line simply connecting the representative points in the touch area. Therefore, even if the touch area is moved quickly or slowly, the shape of the line does not change, and it is impossible to reproduce the shading, blurring, and blurring that occur when handwritten with a brush on the paper.

  Further, by selecting a thick pen using a pen selection function provided in the handwriting input device, the movement locus of the touch position can be drawn with a thick line. However, this method only displays the movement trajectory of the touch position with a thick line, and the density of each part of the line is constant, so the density, blur, and blurring as when handwritten with a brush on the paper are still used. It cannot be reproduced.

  In order to solve this problem, the above-mentioned Patent Document 1 detects the touch position of the brush, the trajectory of the brush, the writing pressure, and the rotation of the pen so that the handwritten thickness, splash, and stop can be expressed. However, this technology does not acquire the shape of the touch area, but merely predicts the thickness, splash, stop, etc., using the preset line and pen rotation rate. It is not possible to reproduce shading, blurring or blurring according to the amount of ink coming out of the brush when handwritten with a brush.

  Further, in Patent Document 2, it is possible to simulate a state in which ink is applied to paper and fixed based on time and pressure when writing with a brush. However, the thickness of the brush is a simulation, and the total pressure value actually applied to the intersection of the electrodes is not acquired even at the writing pressure. It is not possible to reproduce shading, blurring or blurring according to the amount of ink coming.

  In Patent Document 3, a brush brush is provided with a plurality of sensors as a brush brush expression simulator so that pressure distribution can be detected and simulated. However, with this technique, it is necessary to use a dedicated brush, and since the blur is expressed only by the pressure gradient within the acquisition area, for example, in the case of a constant pressure distribution, the blur can be expressed. Can not.

  The present invention has been made in view of the above-mentioned problems, and its main purpose is to reproduce shading, blurring, and blurring as when handwritten with a brush on paper on handwritten information on a touch panel. An object of the present invention is to provide a handwriting input device, a control program, and a control method.

  One aspect of the present invention includes a touch panel that includes electrodes arranged in a direction orthogonal to each other in a handwriting input device, and that can simultaneously detect pressing of each intersection where the electrodes intersect, and the touch panel at predetermined time intervals. A pressure value calculation unit that obtains a pressure value at each of the intersections from each other, integrates the pressure values within a predetermined time, and calculates a total pressure value at each of the intersections, and an output device corresponding to each of the intersections An output value calculating unit that determines an output value that defines the concentration of each of the output positions based on the total pressure value of each of the intersections, and each of the output positions and the output position An output control unit that associates the output value with the output value and outputs the output value to the output device.

  One aspect of the present invention is a control program that operates on a handwriting input device that includes electrodes arranged in directions orthogonal to each other and includes a touch panel that can simultaneously detect the pressing of each intersection where the electrodes intersect. A pressure value for acquiring a pressure value at each intersection from the touch panel at a predetermined time interval on a handwriting input device, and integrating the pressure values within a predetermined time to calculate a total pressure value at each intersection. An output value calculation that specifies an output position of the output device corresponding to each intersection and calculates an output value that defines a concentration of each output position based on the total pressure value of each intersection A step of associating each output position with the output value of the output position and outputting the output position to the output device;

  One aspect of the present invention is a control method in a handwriting input device that includes electrodes arranged in directions orthogonal to each other, and includes a touch panel that can simultaneously detect the pressing of each intersection where the electrodes intersect. A pressure value calculating step of obtaining a pressure value of each intersection from the touch panel at time intervals, integrating the pressure values within a predetermined time, and calculating a total pressure value of each intersection; and each intersection An output value calculating step for specifying an output position of the output device corresponding to each of the output points, and calculating an output value defining a concentration of each of the output positions based on the total pressure value of each of the intersections; and each of the outputs An output control step of associating a position with the output value of the output position and outputting the output value to the output device is executed.

  According to the handwriting input device, the control program, and the control method of the present invention, it is possible to reproduce shading, blurring, and blurring as when handwritten information on the touch panel is handwritten with a brush on paper.

  The reason for this is that in a handwriting input device that includes electrodes arranged in directions orthogonal to each other and that can simultaneously detect the pressing of each intersection where the electrodes intersect, the touch panel control unit (control program) is predetermined. Acquire pressure values at each intersection at time intervals, calculate the total pressure value by accumulating the acquired pressure values within a predetermined time, specify the output position of the output device corresponding to each intersection, and each intersection This is because, based on the total pressure value, an output value that defines the concentration at each output position is calculated, and each output position and the output value at the output position are associated with each other and output to the output device.

It is a figure which compares and demonstrates a capacitive type or electromagnetic induction type touch panel and a digital resistive film type touch panel. It is a figure explaining the pressure distribution in the digital resistive film type touch panel. It is a figure which compares and demonstrates the display state of a capacitive type or electromagnetic induction type touch panel, and a digital resistive film type touch panel. It is a figure which shows the external appearance structure of the handwriting input device which concerns on one Example of this invention. It is a block diagram which shows the structure of the handwriting input device which concerns on one Example of this invention. It is a figure explaining the structure of a digital resistive film type touch panel. It is a figure explaining the expression method of the display density according to the total pressure value concerning one example of the present invention. It is a flowchart figure which shows the process (process which expresses shading) of the handwriting input device which concerns on one Example of this invention. It is a flowchart figure which shows the process (process which expresses shading and a blur) of the handwriting input device which concerns on one Example of this invention. It is a flowchart figure which shows the process (process which expresses light and shade) of the handwriting input device which concerns on one Example of this invention.

  As shown in the background art, a touch panel detects a change in a physical quantity at an intersection where strip-shaped electrodes arranged in directions orthogonal to each other intersect. As a detection method, an electrode electromagnetic induction method, electrostatic A capacitance method, a digital resistance film method, and the like are known. Among them, the electrostatic capacity method and the electromagnetic induction method detect changes in the electromagnetic quantity and the electrostatic capacity due to the presence of a conductor such as a stylus pen and a finger. However, there is only one point where a touch can be detected.

  For example, as shown in FIG. 1A, when a pen or finger is touched on the touch panel and handwriting is performed by moving the touch area along the movement trajectory, the electrostatic capacity method or the electromagnetic induction method is performed as shown in FIG. As shown in b), the ON / OFF value is output from the intersection (black circle in the figure) near the center of the touch area, and the line connecting the intersections whose output value is ON (or a line obtained by smoothly processing the line) ) Is displayed. When displaying handwritten information as a thick line, by selecting a thick pen with the pen selection function, as shown in FIG. 1C, a line connecting intersections whose output values are ON (or the line) Smoothly processed lines) are displayed thick with uniform darkness. However, in the capacitance method, the position where the touch can be detected in the touch area is one point, and the output value is binary of ON / OFF, and how much time and how much pressure is at the intersection of each electrode In the electromagnetic induction method, the output value is multivalued, but it is judged how much time and how much pressure is applied to the intersection of each electrode. Because it was not possible to do so, it was not possible to express shading, blurring, and blurring as when handwritten with a brush on paper.

  On the other hand, the digital resistance film method detects a change in resistance caused by pressing one electrode and bringing it into contact with the other electrode. When touching across a plurality of electrodes, a plurality of touches within a touch region are detected. A change in resistance at the intersection can be detected, and a pressure value applied to each intersection can be detected. Accordingly, as shown in FIG. 1D, the handwritten information can be displayed as an area representing the movement locus of the touch area instead of a line. Further, when the pressure at each intersection at each time point is plotted, a pressure distribution diagram as shown in FIG. 2 can be obtained. By using this pressure distribution diagram and calculating according to the following equation 1, each intersection point can be obtained. A value obtained by integrating the pressure values can be acquired.

  ∫f (x) = S (1)

  Therefore, in one embodiment of the present invention, the pressure value at each intersection when handwriting is performed using a pen whose pen nib is bent (so-called brush pen), and the pressure value is integrated within a predetermined time. (Referred to as total pressure value) is calculated, and based on the total pressure value, an output value that defines the concentration of the output position of the output device corresponding to each intersection is calculated, and each output position and the corresponding output position are calculated. Are output in association with the output value. By calculating this total pressure value, the amount of liquid containing pigments or dyes such as ink, ink, or paint that oozes out from the brush tip when handwritten on paper or campus using a brush used in calligraphy or watercolor Ink amount) can be estimated, and by calculating an output value corresponding to the estimated ink amount, it is possible to reproduce shading, blurring and blurring when handwritten with a brush.

  For example, as shown in FIG. 3A, when the nib is moved at a constant speed without changing the direction of the nib of the writing brush pen (see the left side of the figure), the capacitance type or electromagnetic induction type In this case, the handwritten information is a line that connects one point near the center position of the touch area of the pen tip, and even if a thick pen is selected by the pen selection function, only a thick line with the same density is displayed (see FIG. In the middle). On the other hand, when the method of the present invention is applied to a digital resistive film type touch panel, the total pressure value is larger in the portion closer to the base than in the portion near the tip of the pen tip. The lower side of the movement trajectory is darker and the upper side is lighter (in the figure, the shade is changed to express the shade), and the shade when handwritten with a brush on the paper can be reproduced (right side of the figure) reference).

  In addition, as shown in FIG. 3B, when the pen tip is written out from a stationary state without changing the direction of the pen tip of the brush pen (see the left side of the figure), in the case of the capacitance method or electromagnetic induction method Although only a thick line with the same density is displayed (refer to the center of the figure), when the method of the present invention is applied to a digital resistive film type touch panel, pressure is applied at the beginning of writing. Since the total pressure value becomes longer and the total pressure value becomes larger, not only the lower side of the movement trajectory of the touch area but also the left side becomes darker, and the light and shade when handwritten with a brush on the paper can be reproduced (right side of the figure) reference).

  Also, as shown in FIG. 3 (c), when the brush pen is moved while changing the direction of the pen tip (see the left side of the figure), in the case of the capacitance method or the electromagnetic induction method, the same concentration is used. Although only a thick line is displayed (see the center of the figure), when the method of the present invention is applied to a digital resistive touch panel, the touch area changes according to the direction of the pen tip and moves. The upper left part of the locus is touched for a short time with a small pressure, and the total pressure value becomes smaller, so the display of the upper left part of the movement locus is further thinned, and the light and shade when handwritten with a brush on the paper can be reproduced ( (See right side of figure).

  Further, when the output value defining the density exceeds the density that can be output by the output device (maximum density), the difference is added to the output value at the adjacent output position (that is, the state where the ink spreads on the paper). By reflecting this, it is possible to reproduce the blur when handwritten with a brush on the paper. Further, when the total value of the sequentially calculated output values exceeds a predetermined threshold value, the output value calculated thereafter is subtracted (that is, the state where the ink remaining in the pen tip is reduced) is subtracted. By this, it is possible to reproduce the blur when handwritten with a brush on the paper.

  In order to describe the above-described embodiment of the present invention in more detail, a handwriting input device, a control program, and a control method according to an embodiment of the present invention will be described with reference to FIGS. FIG. 4 is a diagram illustrating an external configuration of the handwriting input device according to the present embodiment, and FIG. 5 is a block diagram illustrating a configuration of the handwriting input device. FIG. 6 is a diagram for explaining the structure of a digital resistive film type touch panel, and FIG. 7 is a diagram for explaining a display density expression method corresponding to the total pressure value. 8 to 10 are flowcharts showing processing of the handwriting input device of this embodiment.

  The handwriting input device 10 according to the present embodiment is a device including a touch panel 14 that enables handwriting input, and is roughly classified into the following two types. One of them is a device such as a tablet terminal or a smartphone equipped with a touch panel 14 in which a digital resistive film type electrode is formed on a display unit as shown in FIG. The handwriting input by the pen 20 or the finger on the touch panel is received, handwritten information is displayed, electronic data of the handwritten information is stored, or output to an external output device such as a display device or a printing device. As shown in FIG. 4B, the other one is a device having a touch panel 14 in the shape of a binder and having a digital resistive film electrode formed on a table on which the paper 30 is placed. It accepts handwriting input on the paper 30 by a pen 20 such as a pen or a finger, and stores electronic data of handwritten information or outputs it to an external output device such as a display device or a printing device.

  As shown in FIG. 5, the handwriting input device 10 includes a control unit 11, a communication I / F unit 12, a touch panel control unit 13, and a touch panel 14.

  The control unit 11 includes a CPU (Central Processing Unit) 11a, a ROM (Read Only Memory) 11b, a RAM (Random Access Memory) 11c, a HDD (Hard Disk Drive), an SSD (Solid State Drive), an SD (SD) The CPU 11a develops and executes the program stored in the ROM 11b or the storage unit 11d in the RAM 11c and performs overall control of the handwriting input device 10. The RAM 11 c also functions as an input buffer for storing handwritten information (coordinates of the movement trajectory) input by handwriting on the touch panel 14.

  The communication I / F unit 12 is a NIC (Network Interface Card), a modem, or the like, and is wired according to standards such as Ethernet (registered trademark), NFC (Near Field Communication), Bluetooth (registered trademark), TransferJet (registered trademark), etc. Or wirelessly enables communication with a computer device to which electronic data of handwritten information is transferred.

  The touch panel control unit 13 is a part that controls input and output with respect to the touch panel 14, and includes a pressure value calculation unit 13a, an output value calculation unit 13b, and an output control unit 13c.

  The pressure value calculation unit 13a obtains the pressure value at each intersection of the electrodes from the touch panel 14, and calculates the total pressure value at each intersection by integrating the pressure values within a predetermined time (a series of handwritten information input time). To do. When the touch panel 14 detects ON / OFF, the total pressure value at each intersection is calculated by multiplying the predetermined pressure value by the touch time at each intersection.

  Based on the total pressure value, the output value calculation unit 13b calculates an output value that defines the concentration of the output position of the output device corresponding to each intersection of the electrodes. Specifically, when the output device is a display device, an output value defining the display density in units of pixels (or a plurality of pixels) of the display device is calculated, and when the output device is a printing device, printing is performed on paper. An output value that defines the print density in units of dots (or a plurality of dots) is calculated.

  The output control unit 13c associates each output position with the output value of the output position and outputs the output position to the output device. Specifically, handwritten information is displayed on the touch panel 14 having a display function, electronic data of handwritten information is generated and stored in the storage unit 11d, or an external output device via the communication I / F unit 12 (Display device or printing device).

  The pressure value calculation unit 13a, the output value calculation unit 13b, and the output control unit 13c may be configured as hardware, or the control unit 11 may be configured as the pressure value calculation unit 13a, the output value calculation unit 13b, and the output control unit. The control program may be configured to function as 13c, and the control program may be executed by the CPU 11a.

  The touch panel 14 is a digital resistance film type touch panel formed on a display unit such as an LCD (Liquid Crystal Display) or a table on which a sheet is placed and in which strip-shaped electrodes are arranged in directions orthogonal to each other. . As shown in FIG. 6A, this digital resistive film type touch panel includes a plurality of detection ports (detection elements for detecting a change in resistance) arranged in a matrix at intersections of lines in the X direction and the Y direction. Including the touch panel body 14a, a circuit (voltage application driver 14b) for sequentially applying a voltage to the detection port for each line in the X direction (or Y direction), and an output from the detection port for each line in the Y direction (or X direction) And a signal detected at each intersection of the electrodes in the area touched with the pen 20 or a finger, etc., is notified to the touch panel control unit 13.

  For example, as shown in FIG. 6B, when a region indicated by “A” is touched, when a voltage is applied to the detection port of X4 from the voltage application driver 14b, the sensing circuit 14c is connected to Y1, Y2, A signal from the Y3 detection port is detected. When a voltage is applied to the X5 detection port, signals from the Y1, Y2, Y3, and Y4 detection ports are detected. When a voltage is applied to the detection port X6, signals from the detection ports Y1, Y2, Y3, and Y4 are detected. When a voltage is applied to the X7 detection port, signals from the Y2 and Y3 detection ports are detected. That is, (X4, Y1), (X4, Y2), (X4, Y3), (X5, Y1), (X5, Y2), (X5, Y3), (X5, Y4), (X6, Y1), A touch at 13 intersections of (X6, Y2), (X6, Y3), (X6, Y4), (X7, Y2), (X7, Y3) is detected.

  FIG. 6 shows only the detection mechanism of the touch panel 14, but in the case of a touch panel having a display function, the touch panel body 14a is laminated on a display unit such as an LCD, and the electrode detects the signal by the above method. Display is performed on the LCD pixels corresponding to the intersections at a display density defined by an output value corresponding to the total pressure value at the intersections. For example, if the number of LCD pixels is 512 in the X direction x 384 in the Y direction, and the number of electrodes on the touch panel 14 is 128 in the X direction and 96 in the Y direction, touching the intersection (X4, Y1) on the touch panel 14 The pixels of the LCD to be (X, Y) = (13, 1) to (13, 4), (14, 1) to (14, 4), (15, 1) to (15, 4), (16, The 16 pixels of 1) to (16, 4) are displayed, and display is performed with the display density defined by the output value for the 16 pixels.

  As described above, when the intersection of one electrode on the touch panel 14 corresponds to a plurality of pixels of the output device, an output value calculated for the intersection may be associated with each of the plurality of pixels (that All pixels may be displayed / printed at a display density specified by the output value), and a plurality of output values are assigned to the plurality of pixels so that the plurality of pixels have a density specified by the output value as a whole. May be associated (some pixels may be displayed / printed darkly and others may be displayed / printed lightly).

  The case where the output device is a display device will be specifically described as an example. As shown in FIG. 7A, when the pixel corresponding to the intersection of the electrodes is 4 × 4, the output value for black display is “1”, and the output value for white display is “0”, the output value Is “0.5”, as shown in FIG. 7B, the density of all 16 pixels is 1/2 of the black display (in other words, the brightness is 1/2 of the white display). Gray display is possible with density (gradation) (in the figure, gray is expressed with hatching), and as shown in FIG. The other eight pixels may be displayed black and the density (luminance) may be halved as a whole. Further, in order to make the boundary with the adjacent pixel inconspicuous, as shown in FIGS. 7D and 7E, when the adjacent pixel is black, the pixel on the side far from the pixel closer to the pixel is displayed. When the pixel is gradually thinned (lightened) toward the pixel and the adjacent pixel displays white, the pixel may be darkened (darkened) toward the pixel farther from the pixel closer to the pixel.

  Hereinafter, the process of the handwriting input device 10 having the above configuration will be described. The touch panel control unit 13 or the CPU 11a executes the processing shown in the flowcharts of FIGS. 8 to 10 by developing the control program stored in the ROM 11b or the storage unit 11d in the RAM 11c and executing it. In the following description, the coordinate in the x direction is i, the coordinate in the y direction is j, i is in the range of 1 to M, and j is in the range of 1 to N.

  First, a process for calculating the total pressure value from the pressure value at each intersection of the electrodes and calculating the output value at the output position corresponding to the intersection from the total pressure value will be described with reference to the flowchart of FIG. . It should be noted that the following processing is performed for each predetermined scan rate Δt.

[Reproduction of shading]
The control unit 11 (touch panel control unit 13) initializes the coordinates (i, j) of the intersection of the electrodes of the touch panel 14 and the total pressure value S (i, j) at each intersection (S101). Specifically, 1 is substituted into i and j, and 0 is substituted into the total pressure value S (i, j) at each intersection.

  Next, the control unit 11 (pressure value calculation unit 13a of the touch panel control unit 13) determines whether there is an input from the intersection of the coordinates (i, j) (S102). If there is no input, the process skips to S105, and if there is an input, the control unit 11 (pressure value calculation unit 13a of the touch panel control unit 13) calculates the pressure value S (t) at the intersection of coordinates (i, j). Acquired (S103), and the partial integral ∫S (t) dt of the acquired pressure value S (t) is added to the total pressure value S (i, j) of the coordinates (i, j) (S104).

  Next, the control unit 11 (the output value calculation unit 13b of the touch panel control unit 13) specifies the output position (one or a plurality of pixels) of the output device corresponding to the intersection of the coordinates (i, j), and the total pressure value. Based on S (i, j), an output value Pixel (i, j) at the output position (one or a plurality of pixels) is calculated (S105). When the touch panel 14 has a display function, the control unit 11 (the output control unit 13c of the touch panel control unit 13) displays the specified output position based on the calculated output value.

  This output value can be calculated by α × S (i, j), and the coefficient α can be set as appropriate. For example, the coefficient α can be a value obtained by dividing the maximum density value of the output device by the total pressure value (which may be an actual measurement value or a set value) when handwritten input is performed at a normal writing pressure and speed. In this case, if the handwriting is input at a normal writing pressure and speed, the density at the output position becomes the maximum density, and if the handwriting is input at a weak writing pressure or at a high speed, the density at the output position becomes thinner than the maximum density. .

  The coefficient α can also be set based on the distribution of the total pressure value at each intersection. For example, if the maximum concentration value of the output device is divided by the maximum value among the total pressure values at each intersection, only the concentration at the output position corresponding to the maximum value becomes the maximum concentration, and other output positions The concentration of is less than the maximum concentration. Further, if the value of the maximum density of the output device is divided by the most frequent total pressure value among the total pressure values at each intersection, the output position where the maximum density can be increased.

  In the above description, the output value at the output position corresponding to the predetermined intersection is calculated based only on the total pressure value at the predetermined intersection. For example, the distribution of the total pressure value at each intersection varies greatly. If there is an intersection where the total pressure value protrudes, it is estimated from the value calculated based on the total pressure value at the predetermined intersection and the output value calculated based on the total pressure value at the intersection adjacent to the predetermined intersection The output value at the output position corresponding to the predetermined intersection may be set based on the value to be set (for example, the average value of the output value on the left and the output on the right). Specifically, a value obtained by adding the calculated value and the estimated value, an average value of the calculated value and the estimated value, or the like may be set as the output value of the output position.

  In addition, when a plurality of pixels are included in the output position corresponding to the intersection of the electrodes, as described above, the output value may be associated with each of the plurality of pixels, or the plurality of pixels may be output as a whole. A plurality of output values may be associated with a plurality of pixels so as to obtain a density defined by the value.

  Here, the output value is calculated based on the value obtained by integrating the pressure values at the intersections of the electrodes within a predetermined time. However, when the touch panel 14 detects only ON / OFF (the pressure value cannot be detected), As described above, the output value may be calculated based on a value obtained by multiplying the predetermined pressure value by the touch time at each intersection.

  Next, the control unit 11 (touch panel control unit 13) updates the coordinate i in the x direction by adding 1 (S106), and the coordinate i in the x direction is the number M of electrodes in the x direction (lateral direction) of the touch panel 14. (S107). If i is less than or equal to M, the process returns to S102 and the same processing is repeated. If i exceeds M, 1 is added to the coordinate j in the y direction and updated (S108). It is confirmed whether it is smaller than the number N of 14 electrodes in the y direction (vertical direction) (S109). When j is less than or equal to N, the process returns to S102 and the same processing is repeated, and when j exceeds N, the control unit 11 (the output control unit 13c of the touch panel control unit 13) determines each output position as necessary. Electronic data in which (one or a plurality of pixels) is associated with the output value of the output position is generated, and the electronic data is stored in the storage unit 11d or output to another output device connected via a communication network. Or

  In S105, handwritten information is sequentially displayed on the touch panel 14 every time an output value for each output position is calculated. After calculating output values for all output positions, the handwritten information is collectively displayed on the touch panel 14. May be displayed.

  Thus, the total pressure value (or the total pressure value obtained by multiplying the predetermined pressure value by the touch time) obtained by accumulating the pressure values at the intersections of the electrodes within the predetermined time is calculated, and based on the calculated total pressure value, By calculating the output value of the output position corresponding to each intersection, and displaying / printing handwritten information based on the calculated output value, the portion corresponding to the strongly touched position or the long touched position is dark and the touch is weak The portion corresponding to the position or the position touched shortly becomes thin, and the light and shade according to the ink amount when handwritten with a brush on the paper can be reproduced.

  Next, processing for reproducing “smudge” when handwritten with a brush on a sheet in addition to shading will be described with reference to a flowchart of FIG. It should be noted that the following processing is performed for each predetermined scan rate Δt.

[Reproduction of blur]
Similarly to the above, the control unit 11 (touch panel control unit 13) initializes the coordinates (i, j) of the intersection of the electrodes of the touch panel 14 and the total pressure value S (i, j) of each intersection (S201). Next, the control unit 11 (pressure value calculation unit 13a of the touch panel control unit 13) determines whether there is an input from the intersection of the coordinates (i, j) (S202), and if there is no input, skips to S205. To do. When there is an input, the control unit 11 (pressure value calculation unit 13a of the touch panel control unit 13) acquires the pressure value S (t) at the intersection of the coordinates (i, j) (S203), and the acquired pressure value S The partial integral ∫S (t) dt of (t) is added to the total pressure value S (i, j) of the coordinates (i, j) (S204).

  Next, the control unit 11 (the output value calculation unit 13b of the touch panel control unit 13) specifies the output position (one or a plurality of pixels) of the output device corresponding to the intersection of the coordinates (i, j), and the total pressure value. Multiply S (i, j) by the coefficient α described above to calculate an output value Pixel (i, j) at the output position (one or more pixels) (S205). When the touch panel 14 has a display function, the control unit 11 (the output control unit 13c of the touch panel control unit 13) displays the specified output position based on the calculated output value.

  Similarly to the above, the coefficient α can be appropriately set. For example, the value obtained by dividing the maximum density value of the output device by the total pressure value when handwritten input is performed at a normal writing pressure and speed. be able to. The coefficient α can also be set based on the distribution of the total pressure value at each intersection. For example, the value of the maximum concentration of the output device is the total pressure value with the highest frequency among the total pressure values at each intersection. It can also be a value divided by.

  In addition, based on the value calculated based on the total pressure value of the predetermined intersection and the value estimated from the output value calculated based on the total pressure value of the intersection adjacent to the predetermined intersection, the predetermined intersection The output value of the corresponding output position can be set. Further, when a plurality of pixels are included in the output position corresponding to the intersection of the electrodes, the output value may be associated with each of the plurality of pixels, or the plurality of pixels are defined by the output value as a whole. A plurality of output values may be associated with a plurality of pixels so as to obtain a density. When the touch panel 14 detects only ON / OFF, the output value may be calculated based on a value obtained by multiplying a predetermined pressure value by the touch time at each intersection.

  Next, the control unit 11 (the output value calculation unit 13b of the touch panel control unit 13) determines whether the calculated output value exceeds the maximum density (Pixel max) that can be output by the output device (S206). If the calculated output value is equal to or lower than the maximum outputable density, the output can be made based on the calculated output value, so that the process skips to S209. On the other hand, when the calculated output value exceeds the maximum outputable density, the control unit 11 (the output value calculation unit 13b of the touch panel control unit 13) calculates the difference between the maximum outputable density and the calculated output value. Then, the difference value is calculated for one or a plurality of output positions adjacent to the output position (one or more output positions selected from up, down, left, right, and diagonally adjacent output positions). It adds to an output value (S208).

  Thereafter, similarly to the above, the control unit 11 (touch panel control unit 13) updates the coordinate i in the x direction by adding 1 (S209), and the coordinate i in the x direction is the x direction (lateral direction) of the touch panel 14. It is confirmed whether it is smaller than the number M of electrodes (S210). If i is less than or equal to M, the process returns to S202 and the same processing is repeated. If i exceeds M, 1 is added to the coordinate j in the y direction and updated (S211). It is confirmed whether it is smaller than the number N of 14 electrodes in the y direction (vertical direction) (S212). If j is less than or equal to N, the process returns to S202 and the same processing is repeated. If j exceeds N, the control unit 11 (the output control unit 13c of the touch panel control unit 13) may select each output position as necessary. Electronic data in which (one or a plurality of pixels) is associated with the output value of the output position is generated, and the electronic data is stored in the storage unit 11d or output to another output device connected via a communication network. Or Similarly to the above, handwritten information may be displayed on the touch panel 14 after calculating output values for all output positions.

  Thus, the total pressure value (or the total pressure value obtained by multiplying the predetermined pressure value by the touch time) obtained by accumulating the pressure values at the intersections of the electrodes within the predetermined time is calculated, and based on the calculated total pressure value, By calculating the output value of the output position corresponding to each intersection, and if the calculated output value exceeds the maximum density that can be output, by adding the difference to the output value of the output position adjacent to the output position, Since it is also output from the output position corresponding to the intersection that is not actually touched, it is possible to reproduce “smudge” in which ink spreads when handwritten on a sheet with a brush.

  Next, processing for reproducing “blur” when handwritten with a brush on a sheet in addition to shading will be described with reference to the flowchart of FIG. It should be noted that the following processing is performed for each predetermined scan rate Δt.

[Reproduction of blur]
Similarly to the above, the control unit 11 (touch panel control unit 13) initializes the coordinates (i, j) of the intersection of the electrodes of the touch panel 14 and the total pressure value S (i, j) of each intersection (S301). Next, the control unit 11 (pressure value calculation unit 13a of the touch panel control unit 13) determines whether there is an input from the intersection of the coordinates (i, j) (S302), and if there is no input, skips to S305. To do. When there is an input, the control unit 11 (pressure value calculation unit 13a of the touch panel control unit 13) acquires the pressure value S (t) at the intersection of the coordinates (i, j) (S303), and the acquired pressure value S The partial integral ∫S (t) dt of (t) is added to the total pressure value S (i, j) of the coordinates (i, j) (S304).

  Next, the control unit 11 (the output value calculation unit 13b of the touch panel control unit 13) specifies the output position (one or a plurality of pixels) of the output device corresponding to the intersection of the coordinates (i, j), and the total pressure value. Multiply S (i, j) by the coefficient α described above to calculate an output value Pixel (i, j) at the output position (one or more pixels) (S305).

  Similarly to the above, the coefficient α can be appropriately set. For example, the value obtained by dividing the maximum density value of the output device by the total pressure value when handwritten input is performed at a normal writing pressure and speed. be able to. The coefficient α can also be set based on the distribution of the total pressure value at each intersection. For example, the value of the maximum concentration of the output device is the total pressure value with the highest frequency among the total pressure values at each intersection. It can also be a value divided by.

  In addition, based on the value calculated based on the total pressure value of the predetermined intersection and the value estimated from the output value calculated based on the total pressure value of the intersection adjacent to the predetermined intersection, the predetermined intersection The output value of the corresponding output position can be set. Further, when a plurality of pixels are included in the output position corresponding to the intersection of the electrodes, the output value may be associated with each of the plurality of pixels, or the plurality of pixels are defined by the output value as a whole. A plurality of output values may be associated with a plurality of pixels so as to obtain a density. When the touch panel 14 detects only ON / OFF, the output value may be calculated based on a value obtained by multiplying a predetermined pressure value by the touch time at each intersection.

  Next, the control unit 11 (the output value calculation unit 13b of the touch panel control unit 13) calculates the output value calculated from the converted ink amount (InkI) obtained by converting the ink amount that can be held in the pen tip of the brush into the output value. Is subtracted (S306), and the converted ink amount (ie, converted ink remaining amount) obtained by subtracting the output value is smaller than the first minimum ink amount (Inkl min1) set in advance (in other words, the total value of the output values) Is exceeded the first threshold) (S307). The first minimum ink amount is a value obtained by converting the ink amount at which fading starts to occur into an output value.

  If the converted ink remaining amount is equal to or greater than the first minimum ink amount, the control unit 11 (the output control unit 13c of the touch panel control unit 13) calculates the specified output position if the touch panel 14 has a display function. After displaying based on the output value, the process skips to S311 and if the converted ink remaining amount is smaller than the first minimum ink amount, the control unit 11 (the output value calculation unit 13b of the touch panel control unit 13) It is determined whether the remaining amount of ink is smaller than a preset second minimum ink amount (Inkl min2) (in other words, whether the total value of output values exceeds a second threshold value greater than the first threshold value) (S308). ). The second minimum ink amount is a value obtained by converting the amount of ink that cannot be written due to an increased degree of blurring into an output value.

  When the converted ink remaining amount is equal to or larger than the second minimum ink amount, the control unit 11 (the output value calculation unit 13b of the touch panel control unit 13) subtracts a predetermined value (β) from the output value calculated in S305. (S309) If the touch panel 14 has a display function, the control unit 11 (the output control unit 13c of the touch panel control unit 13) displays based on the output value obtained by subtracting the specified output position. Note that the value of β can be set as appropriate according to the degree of fading when the handwriting is actually handwritten on the paper with a brush. On the other hand, when the converted ink remaining amount is smaller than the second minimum ink amount, the control unit 11 (the output value calculation unit 13b of the touch panel control unit 13) sets the output value calculated in S305 to 0 (S310). 11 (the output control unit 13c of the touch panel control unit 13) displays the specified output position with the output value 0.

  Thereafter, similarly to the above, the control unit 11 (touch panel control unit 13) updates the coordinate i in the x direction by adding 1 (S311), and the coordinate i in the x direction is the x direction (lateral direction) of the touch panel 14. It is confirmed whether it is smaller than the number M of electrodes (S312). If i is less than or equal to M, the process returns to S302 and the same processing is repeated. If i exceeds M, 1 is added to the coordinate j in the y direction and updated (S313). It is confirmed whether it is smaller than the number N of electrodes in the y direction (vertical direction) 14 (S314). When j is less than or equal to N, the process returns to S302 and the same processing is repeated. When j exceeds N, the control unit 11 (the output control unit 13c of the touch panel control unit 13) can output each output position as necessary. Electronic data in which (one or a plurality of pixels) is associated with the output value of the output position is generated, and the electronic data is stored in the storage unit 11d or output to another output device connected via a communication network. Or Similarly to the above, handwritten information may be displayed on the touch panel 14 after calculating output values for all output positions.

  Thus, the total pressure value (or the total pressure value obtained by multiplying the predetermined pressure value by the touch time) obtained by accumulating the pressure values at the intersections of the electrodes within the predetermined time is calculated, and based on the calculated total pressure value, Calculate the output value of the output position corresponding to each intersection, subtract the output value from the initial ink amount, calculate the current ink remaining amount, and if the current ink remaining amount is less than the predetermined ink amount (If the current ink usage exceeds a predetermined threshold), the density of the output position gradually becomes lighter by reducing the calculated output value or setting it to 0, so handwriting with a brush on the paper You can reproduce the “blur” when you do.

  Note that the present invention is not limited to the above embodiment, and the configuration and control method of the handwriting input device 10 can be changed as appropriate without departing from the spirit of the present invention.

  For example, in the second embodiment, an example of reproducing “smudge” in addition to shading is shown, and in the third embodiment, an example of reproducing “blur” in addition to shading is shown. By comparing the maximum possible density and comparing the current remaining ink amount and the minimum ink amount, it is possible to reproduce both “smudge” and “blur” in addition to the light and shade.

  INDUSTRIAL APPLICABILITY The present invention is applicable to a handwriting input device including a digital resistive film type touch panel, a control program that operates on the handwriting input device, a recording medium that records the control program, and a control method using the handwriting input device. is there.

10 handwriting input device 11 control unit 11a CPU
11b ROM
11c RAM
11d Storage unit 12 Communication I / F unit 13 Touch panel control unit 13a Pressure value calculation unit 13b Output value calculation unit 13c Output control unit 14 Touch panel 14a Touch panel body 14b Voltage application driver 14c Sensing circuit 20 Pen 30 Paper

Claims (24)

A touch panel comprising electrodes arranged in directions orthogonal to each other, and capable of simultaneously detecting the pressing of each intersection where the electrodes intersect;
A pressure value calculation unit that obtains a pressure value at each intersection from the touch panel at a predetermined time interval, integrates the pressure values within a predetermined time, and calculates a total pressure value at each intersection;
An output value calculating unit that specifies an output position of the output device corresponding to each of the intersections, and calculates an output value that defines a concentration of each of the output positions based on the total pressure value of each of the intersections;
An output control unit that associates each output position with the output value of the output position and outputs the output value to the output device;
A handwriting input device characterized by that. When the pressure value calculation unit obtains the presence or absence of pressing of each intersection from the touch panel, the pressure value calculation unit multiplies a predetermined pressure value by the touch time of each intersection to calculate the total pressure at each intersection. Calculate the value,
The handwriting input device according to claim 1. The output value calculation unit is based on an output value calculated for a predetermined output position and an estimated value estimated from an output value calculated for an output position adjacent to the predetermined output position. Set the output value for a given output position,
The handwriting input device according to claim 1 or 2, characterized by the above-mentioned. When the output value calculated for the predetermined output position exceeds the maximum density that can be output by the output device, the output value calculation unit calculates the difference between the maximum density and the output value as the predetermined output. Adding to the output value of one or more output positions adjacent to the position;
The handwriting input device according to any one of claims 1 to 3. The output value calculation unit calculates a total value of the sequentially calculated output values. When the total value exceeds a predetermined first threshold value, the predetermined value is subtracted from output values calculated thereafter. ,
The handwriting input device according to claim 1, wherein the handwriting input device is a handwriting input device. The output value calculation unit sets an output value to be calculated thereafter to 0 when the total value exceeds a second threshold value that is greater than the first threshold value.
The handwriting input device according to claim 5. When the output control unit includes a plurality of pixels in one output position, the output control unit associates the output value calculated for the output position with each of the plurality of pixels.
The handwriting input device according to any one of claims 1 to 6. When the output control unit includes a plurality of pixels in one output position, the plurality of pixels are configured such that the plurality of pixels have a density defined by the output value calculated for the output position as a whole. A plurality of output values are associated with each pixel.
The handwriting input device according to any one of claims 1 to 6. A control program that operates on a handwriting input device that includes electrodes arranged in directions orthogonal to each other and includes a touch panel that can simultaneously detect the pressing of each intersection where the electrodes intersect,
In the handwriting input device,
A pressure value calculating step of obtaining a pressure value of each intersection from the touch panel at a predetermined time interval, integrating the pressure values within a predetermined time, and calculating a total pressure value of each intersection;
An output value calculating step of specifying an output position of the output device corresponding to each of the intersections, and calculating an output value defining a concentration of each of the output positions based on the total pressure value of each of the intersections;
Associating each output position with the output value of the output position, and executing an output control step of outputting to the output device;
A control program characterized by that. In the pressure value calculating step, when the presence / absence of pressing of each intersection point is acquired from the touch panel, a predetermined pressure value is multiplied by the touch time of each intersection point, and the total pressure at each intersection point is calculated. Calculate the value,
The control program according to claim 9. In the output value calculating step, based on the output value calculated for the predetermined output position and the estimated value estimated from the output value calculated for the output position adjacent to the predetermined output position, Set the output value for a given output position,
The control program according to claim 9 or 10, wherein: In the output value calculating step, if the output value calculated for the predetermined output position exceeds the maximum density that can be output by the output device, the difference between the maximum density and the output value is calculated as the predetermined output. Adding to the output value of one or more output positions adjacent to the position;
The control program according to any one of claims 9 to 11, wherein: In the output value calculating step, a total value of the output values calculated sequentially is calculated, and when the total value exceeds a predetermined first threshold value, a predetermined value is subtracted from the output value calculated thereafter. ,
The control program according to any one of claims 9 to 12. In the output value calculating step, when the total value exceeds a second threshold value that is larger than the first threshold value, an output value to be calculated thereafter is set to 0.
The control program according to claim 13. In the output control step, when a plurality of pixels are included in one output position, the output value calculated for the output position is associated with each of the plurality of pixels.
The control program according to any one of claims 9 to 14, wherein In the output control step, when a plurality of pixels are included in one output position, the plurality of pixels are set to have a density defined by the output value calculated for the output position as a whole. A plurality of output values are associated with each pixel.
The control program according to any one of claims 9 to 14, wherein A control method in a handwriting input device comprising electrodes arranged in directions orthogonal to each other and comprising a touch panel capable of simultaneously detecting the pressing of each intersection where the electrodes intersect,
A pressure value calculating step of obtaining a pressure value of each of the intersections from the touch panel at a predetermined time interval, integrating the pressure values within a predetermined time, and calculating a total pressure value of each of the intersections;
An output value calculating step of identifying an output position of the output device corresponding to each of the intersections, and calculating an output value defining a concentration of each of the output positions based on the total pressure value of each of the intersections;
An output control step of associating each output position with the output value of the output position and outputting the output value to the output device;
A control method characterized by that. In the pressure value calculating step, when the presence / absence of pressing of each intersection point is acquired from the touch panel, a predetermined pressure value is multiplied by the touch time of each intersection point, and the total pressure at each intersection point is calculated. Calculate the value,
The control method according to claim 17. In the output value calculating step, based on the output value calculated for the predetermined output position and the estimated value estimated from the output value calculated for the output position adjacent to the predetermined output position, Set the output value for a given output position,
The control method according to claim 17 or 18, characterized in that: In the output value calculating step, if the output value calculated for the predetermined output position exceeds the maximum density that can be output by the output device, the difference between the maximum density and the output value is calculated as the predetermined output. Adding to the output value of one or more output positions adjacent to the position;
The control method according to any one of claims 17 to 19, characterized in that: In the output value calculating step, a total value of the output values calculated sequentially is calculated, and when the total value exceeds a predetermined first threshold value, a predetermined value is subtracted from the output value calculated thereafter. ,
The control method according to any one of claims 17 to 20, wherein In the output value calculating step, when the total value exceeds a second threshold value that is larger than the first threshold value, an output value to be calculated thereafter is set to 0.
The control method according to claim 21, wherein: In the output control step, when a plurality of pixels are included in one output position, the output value calculated for the output position is associated with each of the plurality of pixels.
The control method according to any one of claims 17 to 22, wherein In the output control step, when a plurality of pixels are included in one output position, the plurality of pixels are set to have a density defined by the output value calculated for the output position as a whole. A plurality of output values are associated with each pixel.
The control method according to any one of claims 17 to 22, wherein

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