JP6226057B2 - Character input device and program - Google Patents

Description

  The present invention relates to a character input device and a program.

  In recent years, mobile terminals that can be operated with a touch panel, such as smartphones and tablet terminals, are increasing. In these devices, a software keyboard as a virtual character table is displayed on the display screen, and characters can be input by touching or flicking the character buttons on the software keyboard. .

  Such a software keyboard is represented by an image imitating an actual JIS (Japan Industrial Standard) standard keyboard or a numeric keypad used in a mobile phone. By the way, in an actual keyboard, projections are provided on the “F” key and the “J” key, so that the so-called home position can be recognized only by tactile sense, and the blind touch is facilitated. Further, in the mobile phone, a projection is provided on the “5” key of the numeric keypad, thereby facilitating tactile operation. On the other hand, since such a projection is not provided in the software keyboard, the user performs character input by performing a touch operation while visually recognizing the position of the character on the software keyboard displayed on the screen. Therefore, since a tactile sensation like an actual keyboard cannot be obtained, there is a problem that a touch operation is performed at a position deviated from a position desired by the user and erroneous input is performed.

  In view of this problem, in a conventional character input device, when a key input by a user is detected in a software keyboard including a plurality of keys, a key adjacent to the input detected key is extracted, and the input detected key and the extracted key are displayed. There is a configuration in which conversion candidates are generated from stored keys, and the generated conversion candidates are displayed on a display screen (for example, Patent Document 1).

JP 2013-47872 A

  However, the invention described in Patent Document 1 displays all the conversion candidates that meet the conditions on the display screen regardless of whether or not the key input is accurate, and any one of these displayed conversion candidates. Therefore, it takes time and effort to search for conversion candidates desired by the user. In addition, it is not possible to quickly recognize whether there is an erroneous input. Therefore, there is a problem that operability is not good.

  An object of the present invention is to promptly recognize an erroneous input.

In order to solve the above-described problems, the character input device according to the present invention includes a group of characters to which a character corresponding to the first selection key selected by touching the first selection key corresponding to the predetermined character belongs. Each character is displayed in a list so as to be a second selection key, and when any of the second selection keys displayed in the list is touch-selected, it corresponds to the touch-selected second selection key. An character input device for specifying a character as an input character, wherein the evaluation indicates a possibility of erroneous input of a character based on a touch mode from touch selection with respect to the first selection key to touch selection with respect to the second selection key Deriving means for deriving a value for each input character, and identifying and displaying characters having a high possibility of erroneous input based on the evaluation value derived by the deriving means. When a character identified and displayed as a high-performance character is specified as an input character, each character listed as the second selection key is displayed as a candidate character to replace the character with a high possibility of erroneous input And a display control means .

  According to the present invention, it is possible to promptly recognize an erroneous input.

It is a front view showing the external appearance of the information terminal device which concerns on 1st Embodiment. It is a block diagram which shows schematic structure of the information terminal device which concerns on 1st Embodiment. It is a figure for demonstrating an example of a character input screen. It is a figure for demonstrating an example of a character input screen. It is a figure explaining a detection area. It is a flowchart explaining an input process. It is a figure explaining the structure of a data table. It is a figure explaining the calculation point of an evaluation value. It is a figure explaining the calculation point of an evaluation value. It is a figure explaining the calculation point of an evaluation value. It is a figure for demonstrating an example of a character input screen. It is a figure for demonstrating an example of a character input screen. It is a figure for demonstrating an example of a character input screen. It is a figure explaining a detection area. It is a front view showing the external appearance of the information terminal device which concerns on 2nd Embodiment. It is a block diagram which shows schematic structure of the information terminal device which concerns on 2nd Embodiment. It is a figure for demonstrating an example of a character input screen. It is a flowchart explaining an input process. It is a figure explaining the structure of a data table. It is a figure explaining the calculation point of an evaluation value. It is a figure explaining the calculation point of an evaluation value. It is a figure for demonstrating an example of a character input screen. It is a figure for demonstrating an example of a character input screen. It is a figure explaining a detection area.

  The best mode for carrying out the present invention will be described below with reference to the drawings. However, although various technically preferable limitations for carrying out the present invention are given to the embodiments described below, the scope of the invention is not limited to the following embodiments and illustrated examples.

(First embodiment)
First, the configuration of the information terminal device according to the first embodiment of the present invention will be described.

  As shown in FIG. 1, the information terminal device 1 is, for example, a smartphone having a telephone function. The information terminal device 1 includes a thin plate-like main body 2 and a touch panel 3 arranged on one surface of the main body 2. The touch panel 3 includes a display unit 3a as a display unit for displaying an image, and an input unit as an input unit that is provided on the entire surface of the display screen of the display unit 3a and performs direct input by touching with a finger or a touch pen. 3b (see FIG. 2). In addition, a speaker 4 for receiving a voice is provided above the display unit 3a, and a microphone 5 for transmitting a voice is provided below the display unit 3a. Further, a power button 6 for turning on / off the power of the information terminal device 1 is arranged on the upper end surface of the main body 2, and volume buttons 7a, 7b for adjusting the received sound volume etc. are arranged on the side end surface. Is arranged.

  The information terminal device 1 has a function as a character input device for inputting characters in addition to the communication and call functions.

  As shown in FIG. 2, the information terminal device 1 includes a touch panel 3, a CPU (Central Processing Unit) 11, a RAM (Random Access Memory) 12, a ROM (Read Only Memory) 13, and a flash memory 14. And a communication unit 15, and each unit is connected via a bus 16.

  The CPU 11 reads a system program stored in the ROM 13, develops it in the work area of the RAM 12, and controls each unit according to the system program. Further, the CPU 11 reads out a processing program stored in the ROM 13 and develops it in the work area, and executes various processes.

The display unit 3 a of the touch panel 3 is configured by an LCD (Liquid Crystal Display) or the like, and displays a display screen such as a character input screen in accordance with an instruction of a display signal input from the CPU 11. That is, the CPU 11 functions as a display control unit that performs display control of the display unit 3a.
The input unit 3b accepts a position input on the display screen of the display unit 3a by a finger or a touch pen, and outputs the position (coordinate) information to the CPU 11.

  The RAM 12 is a volatile memory, and forms a work area for temporarily storing various programs to be executed and data related to these various programs.

  The ROM 13 is a read-only memory, and stores a program for executing various processes, data for reading, and the like. These programs are stored in the ROM 13 in the form of computer readable program codes.

The flash memory 14 is a non-volatile memory that stores information in a readable and writable manner.
The communication unit 15 transmits and receives data for performing a call and communication with the outside. The information terminal device 1 is configured to be connectable to a communication network including the Internet via the communication unit 15.

  For example, as shown in FIG. 3, the information terminal device 1 according to the present embodiment performs character input using a software keyboard KB as a virtual character table displayed on the character input screen DP of the display unit 3a. it can. Specifically, when inputting characters, a character display area CR is formed at the top of the character input screen DP, and a touch operation and a flick (slide) operation on the software keyboard KB displayed at the bottom of the character input screen DP are performed. By doing so, it is possible to input characters, and the input characters are displayed in the character display area CR. The software keyboard KB inputs kana keys 21a to 21j for inputting kana characters, option keys 22 for adding muddy / semi-voiced symbols to the inputted kana characters and converting them to small characters, and symbols. A symbol key 23, a space key 24, and an enter key 25 are arranged. The Kana key 21a is a key for inputting the characters “A”, “I”, “U”, “E”, “O”. The kana key 21b is a key for inputting the characters “ka”, “ki”, “ku”, “ke”, and “ko”. The Kana key 21c is a key for inputting the characters “sa”, “shi”, “su”, “se”, and “so”. The Kana key 21d is a key for inputting the characters “ta”, “chi”, “tsu”, “te”, “to”. The kana key 21e is a key for inputting the characters “na”, “ni”, “nu”, “ne”, “no”. The Kana key 21f is a key for inputting the characters “ha”, “hi”, “fu”, “he”, “ho”. The kana key 21g is a key for inputting the characters “MA”, “MI”, “MU”, “ME”, “MO”. The Kana key 21h is a key for inputting the characters “ya”, “yu”, and “yo”. The kana key 21i is a key for inputting the characters “ra”, “ri”, “ru”, “re”, “ro”. The Kana key 21j is a key for inputting the characters “WA”, “O”, and “N”.

  For example, when inputting the character “Ne” using the above-described software keyboard KB, the kana key 21e is touched as shown in FIG. Then, “Ni”, “Nu”, “Ne” and “No”, which are the characters that make up the four lines in the area where the “N” character is displayed, are highlighted, and the other keys are grayed out and disabled. It is shown that. Then, by flicking the touched finger to the right where “Ne” is placed without releasing it from the touch panel 3 and releasing the finger from the touch panel 3 at the “Ne” position, the character “Ne” is input. A character “Ne” is displayed in the character display area CR. In this embodiment, characters can be input in this way.

  Here, the detection area of each character will be described with reference to FIG. When the kana key 21e is touched, a “na” detection area 31a that is a touch detection range of the character “na” is set in an area overlapping the area where “na” is displayed. In addition, a “ni” detection area 31b that is a touch detection range of “ni” is set on the left side of the “na” detection area 31a, and a “nu” touch detection range is set above the “na” detection area 31a. “N” detection area 31c is set, and on the right side of “N” detection area 31a, “N” detection area 31d, which is the “N” touch detection range, is formed, and below “N” detection area 31a. On the side, a “no” detection region 31e that is a touch detection range of “no” is formed. The “ni” detection region 31b, the “nu” detection region 31c, the “ne” detection region 31d, and the “no” detection region 31e are each formed in a substantially trapezoidal shape in which the region is gradually expanded outward.

  In the present embodiment, since the detection area of each character is set as described above, for example, when inputting the character “Ne”, after performing a touch operation on the “NA” detection area 31a, “ This can be realized by performing a flick operation up to any position in the detection area 31c. The characters “ni”, “nu”, and “no” can be input by the same operation as the character “ne”. The character “NA” can be input by performing a touch operation on the “NA” detection area 31a and then releasing the touched finger in the “NA” detection area 31a without flicking. In addition, it can input similarly about the character of another line.

  Here, when the user performs a flick operation, a character different from an intended character may be input by mistake. For example, as shown in FIG. 4B, when the user tries to input the character “Ne” and tries to flick the “Ne” detection area 31 d, the user erroneously enters the “N” detection area 31 e. There is a case where the character “NO” is input because of flicking. In this embodiment, as will be described later, the mode of the touch operation by the user is evaluated so that characters that are likely to be inaccurate are displayed in an identifiable manner. Can be recognized by the user.

  Next, an input process executed by the CPU 11 of the information terminal device 1 configured as described above will be described with reference to FIG. The input process is executed, for example, when a character is input by the user.

First, the CPU 11 stores input data related to operations on the touch panel 3 (step S101). Specifically, the input start point coordinates that are the coordinates of the position where the input by the touch operation on the touch panel 3 by the user is started, and the input end point coordinates that are the coordinates of the position where the input by the touch operation on the touch panel 3 by the user is completed. Each data of the trajectory in the flick operation from the input start point coordinate to the input end point coordinate is stored in a predetermined area of the RAM 12 in the form of a data table as shown in FIG.
That is, the CPU 11 sets, for each input target character, the input start position when the touch input is started by the input means and the input end position when the touch input is ended after the slide operation is performed from the input start position. It functions as position detecting means for detecting.

  Next, the CPU 11 determines an input target character from the input data stored in the RAM 12 (step S102). Specifically, the CPU 11 specifies a detection area based on the input start point coordinates and the input end point coordinates in the data table stored in the RAM 12, and thereby determines an input target character. For example, in FIG. 5, when the input start point coordinate belongs to the “na” detection region 31 a and the input end point coordinate belongs to the “ne” detection region 31 d, the input target character is “ne”. The determined input target character is stored in the data table shown in FIG. 7, and the character is displayed in the character display area CR of the character input screen DP.

  Next, the CPU 11 calculates an evaluation value based on the input data stored in the RAM 12, and stores it in a predetermined field of the data table shown in FIG. 7 (step S103). This evaluation value is obtained for each input target character.

Here, a procedure for calculating the evaluation value in the present embodiment will be specifically described.
First, as shown in FIG. 8A, the CPU 11 obtains the distance from the center of the character detection area to which the input origin coordinates S (x, y) belong to the input origin coordinates S (x, y). Based on this, the evaluation value is calculated. The calculation of the evaluation value is obtained with reference to a conversion table such as an LUT (Look Up Table) as shown in FIG. This conversion table takes evaluation values from 0 to 1, weighted so that the evaluation value is high for a distance from the center to a certain extent, and the evaluation value is greatly reduced for distances greater than that. Yes. The distance is in the range from 0 to half the length (t) of one side of the detection area. Note that the conversion table is not limited to the one shown in FIG. 8B, and various types can be adopted. For example, the evaluation value may be linearly reduced according to the distance.
As described above, the CPU 11 functions as a distance calculation unit that calculates the distance from the center position of the touch detection range of the input target character corresponding to the position input by the input unit to the position input by the touch.

Secondly, as shown in FIG. 9A, the CPU 11 obtains the distance from the input start point coordinate S (x, y) to the input end point coordinate E (x, y), and calculates the evaluation value based on this. I do. For example, the evaluation value is calculated with reference to a conversion table as shown in FIG. In this conversion table, the evaluation value is a value from 0 to 1, and changes according to the distance from the input start point coordinate S (x, y) to the input end point coordinate E (x, y). According to this conversion table, for example, when the input character is “NA”, the smaller the distance from the input start point coordinate S (x, y) to the input end point coordinate E (x, y), the better. The smaller the value, the higher the evaluation value. When the input target character is “ni”, “nu”, “ne”, “no”, the distance from the input start point coordinate S (x, y) to the input end point coordinate E (x, y) is the character. The closer to the length (t) of one side of the detection region corresponding to “na”, the better. Therefore, the closer to the distance, the higher the evaluation value. The conversion table is not limited to that shown in FIG. 9B, and various types can be adopted. For example, from the input start point coordinate S (x, y) to the input end point coordinate E (x, y). The evaluation value may be linearly increased or decreased according to the distance.
As described above, the CPU 11 uses the input start point position when the touch input is started by the input unit and the input end point position when the touch input is ended after the slide operation is performed from the input start position. It functions as position detecting means for detecting each time.

Thirdly, as shown in FIG. 10A, the CPU 11 determines an angle θ formed by a straight line passing through the input start point coordinate S (x, y) and the input end point coordinate E (x, y) and the horizontal line. The evaluation value is calculated based on this. For example, the evaluation value is calculated with reference to a conversion table as shown in FIG. This conversion table takes evaluation values as values from 0 to 1, and converts them according to the angle θ. That is, the evaluation value is higher as the straight line passing through the input start point coordinate S (x, y) and the input end point coordinate E (x, y) is closer to the horizontal or vertical, and the evaluation value is lower as it is inclined. It has become. Note that the conversion table is not limited to that shown in FIG. 10B, and various types can be adopted. For example, the evaluation value may be linearly increased or decreased according to the angle θ.
As described above, the CPU 11 functions as an angle detection unit that detects an angle of a straight line connecting the input start point position and the input end point position detected by the detection unit.

After each of the three evaluation values is calculated as described above, the average of the evaluation values is obtained, and the obtained average evaluation value is stored in the data table.
Note that an evaluation value stored in the data table may be obtained from one or two of the three evaluation values described above.
In addition, the method of obtaining the evaluation value is not limited to the above-described method, and various methods that can evaluate the input mode when the touch input is performed can be employed.
As described above, the CPU 11 functions as an evaluation unit that calculates an evaluation value for each input target character based on an input mode when a touch input is made by the input unit.

  Returning to FIG. 6, the description continues. Next, the CPU 11 refers to the data table shown in FIG. 7 to determine whether there is an input target character whose evaluation value is less than the threshold (step S104). In the present embodiment, the threshold is set to “5”, for example, but can be set to an appropriate value.

When the CPU 11 determines that there is an input target character whose evaluation value is less than the threshold (step S104: Y), the CPU 11 extracts the input target character having the minimum evaluation value as a correction target character (step S105). Since the input target character with the smallest evaluation value is the character with the highest possibility of erroneous input, in the present embodiment, it is extracted.
As described above, the CPU 11 functions as a correction determination unit that determines a correction target character from the input target characters based on the evaluation value for each input target character obtained by the evaluation unit.

  Subsequently, the CPU 11 displays a correction candidate button on the character input screen (step S106). Specifically, for example, as illustrated in FIG. 7, when the input target character having the smallest evaluation value is “NO”, the CPU 11 displays the character display area CR as illustrated in FIG. 11. In addition, among the character strings of “Not Wak”, the character “no” is highlighted so that it can be recognized as a correction target character. Then, a correction candidate button TS corresponding to the character “NO” is displayed in the vicinity of the character string “NOT WAKE”. The correction candidate button TS is composed of character buttons “NA”, “NI”, “NU”, “NE”, “NO” as replacement character candidates corresponding to the character “NO”.

The CPU 11 determines whether a touch operation has been performed on any of the character buttons constituting the correction candidate button TS (step S107). When the CPU 11 determines that a touch operation has been performed on any of the character buttons constituting the correction candidate button TS (step S107: Y), the target input target character is changed to a character corresponding to the touch-operated character button. Replace (step S108). For example, in FIG. 11, when a touch operation is performed on the character button “Ne” in the correction candidate button TS, the input target character “NO” is corrected to “Ne” as shown in FIG. 12. In addition, the input target character stored in the data table is also corrected from “NO” to “NE”.
As described above, the CPU 11 functions as a correction input receiving unit that receives a correction input of the input target character by a touch input of the input unit with respect to the input target character determined to be the correction target character.

  The CPU 11 executes the process of step S104 after setting the evaluation value of the input target character to be corrected to the maximum value (step S109). Specifically, the CPU 11 rewrites the evaluation value corresponding to the corrected input target character stored in the data table to “1” which is the maximum value.

  On the other hand, when the CPU 11 does not determine in step S107 that a touch operation has been performed on any of the character buttons constituting the correction candidate button TS (step S107: N), whether or not the touch operation has been performed on the correction button P. Is determined (step S110). Specifically, as shown in FIG. 11, the determination is made based on whether or not a touch operation has been performed on the correction button P displayed on the right side of the correction candidate button TS displayed in the character display area CR of the character input screen DP. It can be carried out.

  When the CPU 11 determines that a touch operation has been performed on the correction button P (step S110: Y), the CPU 11 ends the display of the correction candidate button TS (step S111), and then corrects characters other than the correction target character. The correction mode is executed (step S112), and this process ends. In the correction mode, for example, characters can be corrected by operating the software keyboard KB in FIG. 3 such as before and after the cursor key, and the “DEL” key.

  On the other hand, when the CPU 11 does not determine in step S110 that a touch operation has been performed on the correction button P (step S110: N), the CPU 11 determines whether a touch operation has been performed on the confirmation button Q (step S113). Specifically, as shown in FIG. 11, the determination is made based on whether or not a touch operation is performed on the confirmation button Q displayed on the right side of the correction candidate button TS displayed in the character display area CR of the character input screen DP. It can be carried out.

  When the CPU 11 determines that the touch operation has been performed on the confirmation button Q (step S113: Y), the CPU 11 terminates the display of the correction candidate button TS and confirms the input (step S114), and then terminates this process.

  On the other hand, when the CPU 11 does not determine that the touch operation on the confirmation button Q has been performed (step S113: N), the CPU 11 executes the process of step S107.

  Further, when the CPU 11 does not determine in step S104 that there is an input target character whose evaluation value is less than the threshold value (step S104: N), the CPU 11 executes the process of step S112.

  If the character input is subsequently performed, the input process is activated again.

  After the input process described above is executed, the CPU 11 performs a predetermined conversion operation, and as shown in FIG. 13, the “NETWORK” displayed in the character display area CR of the character input screen DP is displayed. Convert string to "network".

  In this embodiment, the input target character having the smallest evaluation value is extracted as the correction target character. However, the number of characters to be extracted as the correction target character is not limited to one and can be set as appropriate. Further, all input target characters whose evaluation value is less than the threshold value may be extracted as correction target characters.

Further, in the present embodiment, the CPU 11 may function as a detection range expansion unit, and control may be performed so as to change the range of the detection area corresponding to the characters before and after correction when correction is performed. Specifically, when the input target character is corrected, the CPU 11 determines that the input target character before correction is “NO” and the corrected input target character is “NE”. As shown in the figure, the range of the detection area is changed so that the range of the “ne” detection area 31d is enlarged and the range of the “no” detection area 31e is reduced. Thereby, a user's erroneous input can be improved.
Thus, the CPU 11 functions as a detection range expansion unit that expands the touch detection range of the input target character for which the correction input is received by the correction input reception unit.
Note that the timing of changing the range of the detection area may be when correction is performed once for one character or when it is performed a plurality of times. Further, the amount of change in the detection area range may be varied according to the number of corrections. Further, the change amount of the detection area range may be varied according to the input start point coordinates, the input end point coordinates, and the trajectory. Further, the change amount of the detection area range may be varied according to the evaluation value.

(Second Embodiment)
Next, the configuration of the information terminal device according to the second embodiment of the present invention will be described.

  As illustrated in FIG. 15, the information terminal device 100 is, for example, a tablet terminal. The information terminal device 100 includes a thin plate-like main body 102 and a touch panel 103 disposed on one surface of the main body 102. The touch panel 103 is arranged on the entire display screen of the display unit 103a as a display unit for displaying an image, and an input unit as an input unit for directly inputting by touching with a finger, a touch pen, or the like. 103b (see FIG. 16).

  The information terminal device 100 has a function as a character input device for inputting characters in addition to a communication function and the like.

  As shown in FIG. 16, the information terminal device 100 includes a CPU 111, a RAM 112, a ROM 113, and a flash memory 114 in addition to the touch panel 103 described above, and each unit is connected via a bus 116. Note that the functions of the touch panel 103, the CPU 111, the RAM 112, the ROM 113, and the flash memory 114 are the same as those of the information terminal device 1 in the first embodiment described above, and thus detailed description thereof is omitted.

  For example, as shown in FIG. 17A, the information terminal device 100 according to the present embodiment performs character input using a software keyboard KB as a virtual character table displayed on the character input screen DP of the display unit 3a. It can be carried out. Specifically, when inputting characters, a character display area CR is formed at the top of the character input screen DP, and characters are input by performing a touch operation on the software keyboard KB displayed at the bottom of the character input screen DP. The entered characters are displayed in the character display area CR. The software keyboard KB is a software keyboard having a QWERTY layout. Romaji keys 121a to 121z for inputting Roman characters, shift keys 122 and 122, symbol keys 123a and 123b for inputting symbols, and a space key 124 , And enter key 125 are arranged.

  In the present embodiment, each character detection area is set to overlap each character key. Therefore, for example, as shown in FIG. 17A, the “C” key 121c, “O” key 121o, “M” key 121m, “P” key 121p, “U” key 121u, “T” on the software keyboard KB. ”Key 121 t,“ E ”key 121 e, and“ R ”key 121 r are touched in this order to detect a touch operation on each character detection area. Characters“ C ”,“ O ”,“ M ”,“ P ”,“ U, “T”, “E”, and “R” are respectively input, and the character string “COMPUTER” is displayed in the character display area CR. In this embodiment, characters can be input in this way.

  Here, there is a case where a character wrong from an intended character is input by mistake of a touch operation by the user. For example, as illustrated in FIG. 17B, the user performs touch operations on the touch positions R1 to R8 in order to input “COMPUTER”, but the touch position R1 is not “C” key 121c but “ Since the “X” key 121x, “XOMPUTER” may be input. That is, the user intends to touch the “C” key 121c, but touches the “X” key 121x, and an erroneous input has occurred. This is because, unlike an actual keyboard, there is no uneven portion, and it is difficult to find the correct key position by touch. In this embodiment, as will be described later, the mode of the touch operation by the user is evaluated so that characters that are likely to be inaccurate are displayed in an identifiable manner. Can be recognized by the user.

  Next, input processing executed by the CPU 111 of the information terminal device 100 configured as described above will be described with reference to FIG. The input process is executed, for example, when a character is input by the user.

  First, the CPU 111 stores input data related to an operation on the touch panel 103 (step S201). Specifically, each data of the input start point coordinates and the input end point coordinates is stored in a predetermined area of the RAM 112 in the form of a data table as shown in FIG. The method for obtaining the input start point coordinates and the input end point coordinates is the same as in the first embodiment described above.

  Next, the CPU 111 determines an input target character from the input data stored in the RAM 112 (step S202). Specifically, the CPU 111 identifies which character detection area the input end point coordinates in the data table stored in the RAM 112 belong to, and thereby determines the input target character. The determined input target character is stored in the data table shown in FIG. 19, and the character is displayed in the character display area CR of the character input screen DP.

  Next, the CPU 111 calculates an evaluation value based on the input data stored in the RAM 112, and stores it in a predetermined field of the data table shown in FIG. 19 (step S203). This evaluation value is obtained for each input target character.

Here, a procedure for calculating the evaluation value in the present embodiment will be specifically described.
First, as shown in FIG. 20A, the CPU 111 first determines the distance from the center of the character detection area to which the input origin coordinates S (x, y) belong to the input origin coordinates S (x, y). The evaluation value is calculated based on this. For example, the evaluation value is calculated with reference to a conversion table as shown in FIG. This conversion table takes evaluation values as values from 0 to 1, and changes according to the distance from the center of the detection area to the input starting point coordinates S (x, y). The distance is in the range from 0 to half the length (t) of one side of the detection area. Note that the conversion table is not limited to that shown in FIG. 20B, and various conversion tables may be employed. For example, the evaluation value may be linearly reduced according to the distance.

Second, as shown in FIG. 21A, the CPU 111 obtains the distance from the input start point coordinate S (x, y) to the input end point coordinate E (x, y), and calculates the evaluation value based on this. I do. That is, the CPU 11 obtains an evaluation value from the length of the sliding operation from the input start point coordinate S (x, y) to the input end point coordinate E (x, y). The calculation of the evaluation value is used with reference to a conversion table as shown in FIG. In this conversion table, the evaluation value is a value from 0 to 1, and changes according to the distance from the input start point coordinate S (x, y) to the input end point coordinate E (x, y). According to this conversion table, the smaller the distance from the input start point coordinate S (x, y) to the input end point coordinate E (x, y), that is, the smaller the movement amount of the touched finger or the like, the better. The smaller the value is, the higher the evaluation value becomes. Note that the conversion table is not limited to that shown in FIG. 21B, and various conversion tables can be employed. The evaluation value may decrease linearly according to the distance.
As described above, the CPU 111 functions as a length detection unit that detects the length of the slide operation between the input start point position detected by the position detection unit and the input end point position.

After calculating the two evaluation values as described above, the average of the evaluation values is obtained, and the obtained average evaluation value is stored in the data table.
Note that an evaluation value stored in the data table may be obtained from one of the two evaluation values described above.
In addition, the method of obtaining the evaluation value is not limited to the above-described method, and various methods that can evaluate the input mode when the touch input is performed can be employed.

  Returning to FIG. 18, the description continues. Next, the CPU 111 refers to the data table shown in FIG. 19 to determine whether there is an input target character whose evaluation value is less than the threshold (step S204). In the present embodiment, the threshold is set to “5”, for example, but can be set to an appropriate value.

  When the CPU 111 determines that there is an input target character whose evaluation value is less than the threshold (step S204: Y), the CPU 111 extracts three input target characters as correction target characters in order of the low evaluation value (step S205). For example, as shown in FIG. 19, the three input target characters having low evaluation values are “X”, “P”, and “R”, and these are extracted as correction target characters. Since these input target characters are characters with a high possibility of erroneous input, in the present embodiment, these are extracted.

  Subsequently, the CPU 111 displays a correction candidate button on the character input screen (step S206). Specifically, for example, as illustrated in FIG. 22, the CPU 111 selects “X”, “X”, which are three input target characters having a low evaluation value from the character string “XOMPUTER” displayed in the character display area CR. Highlighting is performed for “P” and “R” so that they can be recognized as characters to be corrected. Then, a correction candidate button TS1 corresponding to the character “X”, a correction candidate button TS2 corresponding to the character “P”, and a correction candidate button TS3 corresponding to the character “R” are displayed in the vicinity of the character string “XOMPUTER”. To do. The correction candidate button TS1 includes character buttons “X” and “C” as replacement character candidates corresponding to the character “X”. The correction candidate button TS2 is composed of character buttons “O” and “P” as replacement character candidates corresponding to the character “P”. The correction candidate button TS3 includes character buttons “D”, “F”, and “R” as replacement character candidates corresponding to the character “R”. On these correction candidate buttons TS1 to TS3, the position where the touch operation is performed is displayed in a recognizable manner. Thereby, the user can recognize the position where the touch operation is performed. Note that the position where the touch operation is performed may not be displayed.

  Next, the CPU 111 determines whether or not a touch operation has been performed on any of the character buttons constituting the correction candidate buttons TS1 to TS3 (step S207). When the CPU 111 determines that a touch operation has been performed on any of the character buttons constituting the correction candidate buttons TS1 to TS3 (step S207: Y), the input target character corresponding to the touched character button is touch-operated. The character button is replaced with the character corresponding to the character button (step S208). For example, in FIG. 22, when the touch operation is performed on the character button “C” in the correction candidate button TS1, the input target character “X” is corrected to “C” as shown in FIG. Further, the input target character stored in the data table is also corrected from “X” to “C”.

  The CPU 111 executes the process of step S204 after setting the evaluation value of the input target character to be corrected to the maximum value (step S209).

  On the other hand, when the CPU 111 does not determine in step S207 that a touch operation has been performed on any of the character buttons constituting the correction candidate buttons TS1 to TS3 (step S207: N), the touch operation on the correction button P is performed. It is determined whether or not (step S210). Specifically, as shown in FIG. 22, the determination is made based on whether or not a touch operation has been performed on the correction button P displayed on the right side of the correction candidate button TS3 displayed in the character display area CR of the character input screen DP. It can be carried out.

  When the CPU 111 determines that a touch operation has been performed on the correction button P (step S210: Y), the CPU 111 ends the display of the correction candidate buttons TS1 to TS3 (step S211), and then corrects characters other than the correction target characters. Is executed (step S212), and this process is terminated. In the correction mode, for example, characters can be corrected by operating the software keyboard KB in FIG. 17 such as before and after the cursor key and the “DEL” key.

  On the other hand, when the CPU 111 does not determine that the touch operation has been performed on the correction button P (step S210: N), the CPU 111 determines whether or not the touch operation has been performed on the confirmation button Q (step S213). Specifically, as shown in FIG. 22, the determination is made based on whether or not a touch operation is performed on the confirmation button Q displayed on the right side of the correction candidate button TS3 displayed in the character display area CR of the character input screen DP. It can be carried out.

  When the CPU 111 determines that a touch operation has been performed on the confirmation button Q (step S213: Y), the CPU 111 ends the display of the correction candidate button TS and confirms the input (step S214), and then ends this process.

  On the other hand, when the CPU 111 does not determine that the touch operation on the confirmation button Q has been performed (step S213: N), the CPU 111 executes the process of step S207.

  Further, when the CPU 111 does not determine in step S204 that there is an input target character whose evaluation value is less than the threshold (step S204: N), the CPU 111 executes the process of step S212.

  If the character input is subsequently performed, the input process is activated again.

  In the present embodiment, the three input target characters are extracted as correction target characters in order from the lowest evaluation value, but the number to be extracted as correction target characters can be set as appropriate. Further, all input target characters whose evaluation value is less than the threshold value may be extracted as correction target characters.

In the present embodiment, when correction is performed, control may be performed so as to change the range of the detection area corresponding to the characters before and after correction. Specifically, the CPU 111 corrects the input target character when the input target character before correction is “X” and the input target character after correction is “C”. FIG. 24B shows the range of the “X” detection area 131x corresponding to the “X” key 121x set as shown in (a) and the “C” detection area 131c corresponding to the “C” key 121c. As described above, the range of the “X” detection region 131x is reduced and the range of the “C” detection region 131c is increased. Thereby, a user's erroneous input can be improved.
The timing for changing the range of the detection area may be when correction is performed once or when it is performed a plurality of times. Further, the amount of change in the detection area range may be varied according to the number of corrections. Further, the change amount of the detection area range may be varied according to the evaluation value. Further, the change amount of the detection area range may be varied according to the position of the touch operation.

  As described above, according to the present embodiment, the touch panel 3 (103) has the display unit 3a (103a) that performs screen display and the touch input of the position of the screen displayed on the display unit 3a (103a). An input unit 3b (103b) is integrally provided. The CPU 11 (111) displays the character input screen DP having the character display area CR on the display unit 3a (103a), associates the software keyboard KB on which a plurality of characters are arranged with the touch panel 3 (103), and inputs the input unit 3b (103b). The character of the software keyboard KB corresponding to the position input by touching is displayed in the character display area CR as an input target character. CPU11 (111) calculates | requires the evaluation value for every input object character based on the input mode when a touch input is performed in the input part 3b (103b). The CPU 11 (111) determines a correction target character from the input target characters based on the obtained evaluation value for each input target character. The CPU 11 (111) displays the determined correction target character on the display unit 3a (103a) in an identifiable manner. As a result, it is possible to promptly recognize an erroneous input.

  Further, according to the present embodiment, the CPU 11 (111) moves from the center position of the touch detection range of the input target character corresponding to the position touch-inputted by the input unit 3b (103b) to the position touch-input. Calculate the distance. CPU11 (111) calculates | requires the evaluation value for every input object character based on the calculated distance. As a result, erroneous input can be detected appropriately.

  Further, according to the present embodiment, the CPU 11 (111) performs the touch input after the input start position when the touch input is started by the input unit 3b (103b) and the slide operation from the input start position. The input end point position at the end is detected for each input target character. CPU11 (111) calculates | requires the evaluation value for every input object character based on a detection result. As a result, erroneous input can be detected appropriately.

  Further, according to the present embodiment, the CPU 11 (111) detects the length of the sliding operation from the detected input start position to the input end position. CPU11 (111) calculates | requires the evaluation value for every input object character based on the detected length. As a result, erroneous input can be detected appropriately.

  Further, according to the present embodiment, the CPU 11 detects the angle of a straight line connecting the detected input start position and input end position. CPU11 calculates | requires the evaluation value for every input object character based on the detected angle. As a result, erroneous input can be detected appropriately.

  Further, according to the present embodiment, the CPU 11 (111) determines an input target character having at least a minimum evaluation value as a correction target character. As a result, it is possible to more accurately recognize an input target character having a high probability of erroneous input.

  Further, according to the present embodiment, the CPU 11 (111) receives a correction input of the input target character by the touch input of the input unit 3b (103b) for the input target character determined to be the correction target character. The CPU 11 (111) replaces the input target character determined as the correction target character displayed on the display unit 3a (103a) with the input target character for which the correction input has been accepted. As a result, when there is an erroneous input, this can be corrected appropriately.

  Further, according to the present embodiment, the CPU 11 (111) displays the replacement character candidate corresponding to the input target character determined as the correction target character in the vicinity of the correction target character displayed in the character display area CR. When a touch input is performed on a position corresponding to the display of the replacement character candidate, the CPU 11 (111) accepts it as an input target character that replaces the character of the replacement character candidate. As a result, correction can be performed efficiently by a simple operation.

  Further, according to the present embodiment, the CPU 11 (111) expands the touch detection range of the input target character for which the correction input has been accepted. As a result, subsequent erroneous input can be suppressed.

  Further, according to the present embodiment, the CPU 11 (111) expands the touch detection range of the input target character for which the correction input is accepted when the number of correction inputs for one character reaches a predetermined number. . As a result, the touch detection range can be appropriately expanded in accordance with the mode of the user's touch operation.

  In addition, the description content in the said embodiment is a suitable example of the information terminal device which concerns on this invention, and is not limited to this.

  In this embodiment, when there is an evaluation value that is less than the threshold, the input target character having the smallest evaluation value is extracted as the correction target character and displayed, but the evaluation value is less than the threshold. Regardless of whether or not, the input target character of the smallest evaluation value may be extracted as the correction target character and displayed.

  In this embodiment, the correction candidate button is displayed on the character input screen, and the correction input of the character is thereby performed. However, the correction input is not performed and the correction input is performed by the software keyboard KB. It may be.

  Also, as a computer-readable medium storing a program for executing each of the above processes, a non-volatile memory such as a flash memory, a portable recording medium such as a CD-ROM, in addition to a ROM, a hard disk, etc. Is also possible. A carrier wave is also used as a medium for providing program data via a predetermined communication line.

  In addition, the detailed configuration and detailed operation of each device constituting the information terminal device can be changed as appropriate without departing from the spirit of the invention.

Although the embodiments and modifications of the present invention have been described, the scope of the present invention is not limited to the above-described embodiments and modifications, and the scope of the invention described in the claims and equivalents thereof are described. Includes range.
The invention described in the scope of claims attached to the application of this application will be added below. The item numbers of the claims described in the appendix are as set forth in the claims attached to the application of this application.
[Appendix]
<Claim 1>
A touch panel that integrally includes display means for performing screen display, and input means for receiving a touch input of the position of the screen displayed on the display means;
A character input screen having a character display area is displayed on the display means, a virtual character table in which a plurality of characters are arranged is associated with the touch panel, and characters in the virtual character table corresponding to a position touch-input by the input means Display control means for displaying in the character display area as an input target character;
Evaluation means for obtaining an evaluation value for each input target character based on an input mode when touch input is performed by the input means;
Correction determination means for determining a correction target character from the input target characters based on an evaluation value for each input target character obtained by the evaluation means;
With
The display control means causes the display means to display the correction target character determined by the correction determination means in an identifiable manner.
<Claim 2>
A distance calculating unit that calculates a distance from a center position of the touch detection range of the input target character corresponding to the position input by the input unit to the position input by the touch;
The character input device according to claim 1, wherein the evaluation unit obtains an evaluation value for each input target character based on the distance calculated by the distance calculation unit.
<Claim 3>
Position for detecting, for each input target character, an input start position when touch input is started by the input means, and an input end position when touch input is ended after a slide operation is performed from the input start position. A detection means,
The character input device according to claim 1, wherein the evaluation unit obtains an evaluation value for each input target character based on a detection result by the position detection unit.
<Claim 4>
A length detection means for detecting a length of a slide operation between the input start position detected by the position detection means and the input end position;
The character input device according to claim 3, wherein the evaluation unit obtains an evaluation value for each input target character based on the length detected by the length detection unit.
<Claim 5>
An angle detection means for detecting an angle of a straight line connecting the input start position detected by the detection means and the input end position;
The character input device according to claim 3, wherein the evaluation unit obtains an evaluation value for each of the input target characters based on the angle detected by the angle detection unit.
<Claim 6>
The character input device according to claim 1, wherein the correction determination unit determines an input target character having a minimum evaluation value as a correction target character.
<Claim 7>
A correction input receiving means for receiving a correction input of the input target character by touch input of the input means for the input target character determined to be the correction target character;
The display control means replaces an input target character determined to be the correction target character displayed on the display means with an input target character whose correction input has been received by the correction input receiving means. The character input device according to any one of?
<Claim 8>
The display control means displays a replacement character candidate corresponding to the input target character determined as the correction target character by the correction determination means in the vicinity of the correction target character displayed in the character display area,
The correction input accepting unit accepts an input target character that replaces a character of the replacement character candidate when a touch input is performed on a position corresponding to the display of the replacement character candidate. Character input device.
<Claim 9>
9. The character input device according to claim 7, further comprising detection range expansion means for expanding a touch detection range of an input target character whose correction input has been received by the correction input reception means.
<Claim 10>
10. The detection range expansion unit expands a touch detection range of an input target character for which the correction input is accepted when the number of correction inputs for one character reaches a predetermined number. The character input device described.
<Claim 11>
A program for controlling a computer of a character input device including a touch panel that integrally includes display means for performing screen display and input means for receiving a touch input of the position of the screen displayed on the display means,
The computer,
A character input screen having a character display area is displayed on the display means, a virtual character table in which a plurality of characters are arranged is associated with the touch panel, and characters in the virtual character table corresponding to a position touch-input by the input means Display control means for displaying as an input target character in the character display area,
Evaluation means for obtaining an evaluation value for each input target character based on an input mode when touch input is performed by the input means;
Correction determination means for determining a correction target character from the input target characters based on an evaluation value for each input target character obtained by the evaluation means;
Correction target display control means for displaying the correction target character determined by the correction determination means in an identifiable manner on the display means;
Program to function as.

DESCRIPTION OF SYMBOLS 1 Information terminal device 3 Touch panel 3a Display part 3b Input part 11 CPU
DP character input screen KB software keyboard CR character display area 100 information terminal device 103 touch panel 103a display unit 103b input unit 111 CPU

Claims (4)

When the first selection key corresponding to the predetermined character is touch-selected, each character of the group to which the character corresponding to the touch-selected first selection key belongs is displayed in a list so that each character becomes a second selection key. And a character input device that identifies, as an input character, a character corresponding to the second selection key selected by touch when any of the second selection keys displayed in the list is touch-selected,
Derivation means for deriving, for each input character, an evaluation value indicating the possibility of erroneous input of a character based on a touch mode from touch selection for the first selection key to touch selection for the second selection key;
When characters having a high possibility of erroneous input are identified and displayed based on the evaluation value derived by the deriving means, and characters identified and displayed as characters having a high possibility of erroneous input are specified as input characters Display control means for displaying each character displayed as a list as the second selection key as a candidate character to be replaced with a character having a high possibility of erroneous input;
A character input device comprising: 2. The display control unit according to claim 1, wherein when displaying the corrected character candidate, the display control unit displays the candidate character in a layout when the identified and displayed character is specified as an input character . Character input device. Wherein the display control unit, wherein when displaying the corrected character candidate claims, characterized in that for displaying the candidate character in a position different from the display position when the identification character is identified as the input character Item 3. The character input device according to Item 2 . When the computer selects the first selection key corresponding to a predetermined character by touching, the characters of the group to which the character corresponding to the touch-selected first selection key belongs become the second selection key. A list is displayed, and when any one of the second selection keys displayed in the list is touch-selected, the character corresponding to the touch-selected second selection key is specified as an input character. A program,
Deriving means for deriving, for each input character, an evaluation value indicating the possibility of erroneous input of a character based on a touch mode from touch selection for the first selection key to touch selection for the second selection key;
When characters having a high possibility of erroneous input are identified and displayed based on the evaluation value derived by the deriving means, and characters identified and displayed as characters having a high possibility of erroneous input are specified as input characters Display control means for displaying each character displayed as a list as the second selection key as a candidate character to replace the character with a high possibility of erroneous input;
Program to function as.

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