JP2012163993A - Information input device, method for correcting detection area in information input device, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an information input device which prevents a detection area from being corrected even when receiving a deletion operation for modifying input which is not made by a key operation error by a user.SOLUTION: A small-sized information input terminal 1 is configured to display a keyboard with a plurality of keys on a touch panel and receive input of symbols corresponding to the respective keys on the basis of a detection result of operation detection areas for the respective displayed keys. The terminal 1 has: a deletion symbol buffer for, when input symbols are deleted by a deletion operation, temporarily storing the symbols; a deletion operation determination unit 11 for determining whether the deletion operation is executed for modifying symbols erroneously input by a key operation error on the basis of the number of symbols different between the symbols stored in the deletion symbol buffer and symbols input after the deletion operation; and a detection area correction unit 15 for, if the deletion operation determination unit 11 determines that the deletion operation is executed for modifying the symbols erroneously input by the key operation error, correcting detection areas of keys corresponding to symbols which are input after the deletion operation and are different from the symbols stored in the deletion symbol buffer.

Description

  The present invention relates to a technique for displaying a keyboard on a touch panel and inputting information by operating the displayed keyboard.

A personal computer or the like includes a keyboard (desktop keyboard) having a key group of character arrangement such as English letters and hiragana characters. Such a keyboard is a so-called touch panel type (also called a touch screen type or a contact type digitizer). There are devices that display on the screen.
However, when such a device is employed in a small portable terminal such as a mobile phone, the keyboard (virtual keyboard) displayed on the screen is reduced according to the screen size, and each key is necessarily reduced. Furthermore, each key is closely adjacent.

Therefore, due to the influence of individual differences in the operation method when touching the finger with the finger shape or the screen, the area that the user actually touches with the finger spans multiple keys or shifts around the keys Therefore, a key input different from the key intended by the user may be detected, resulting in an erroneous input.
Here, the reason why an erroneous input occurs due to an erroneous operation of the user's key as described above is as follows.

Unlike the desktop keyboard, the screen using the touch panel method has a smooth surface and does not have a three-dimensional shape of an object (key) to be pressed down. Therefore, the user cannot recognize the key to be pressed down by tactile feedback, and has to rely on visual recognition of the position of each key.
On the other hand, the display area of each key that can be displayed on the screen of a small portable terminal is smaller than that of a typical adult fingertip. For example, according to Japanese male measurement data, the width of the tip indirect portion of the second finger (forefinger) is around 17 mm, and the fingertip has a width of about the same. This also shows that in most cases, the fingertip portion that touches the screen is larger than the dimensions of each key.

Therefore, it is difficult for the user to accurately position the fingertip portion with respect to a key that is smaller than the fingertip portion and has no tactile feedback and whose field of view is blocked by the fingertip portion.
When a key is input in such a situation, the contact area of the user's fingertip 100 and the contact area of the user's fingertip 100 are changed as shown in FIG. The key display area will be misaligned. As a result, for example, as shown in FIG. 18A, the user intended to press the “I” key, but actually, as shown in FIG. 18B, the user's fingertip. 100 contact area 100a is positioned on the display area of the “U” key adjacent to the left, and the apparatus side detects the operation of the “U” key. In such a case, not “I” intended by the user but “U” not intended is displayed on the screen.

For the above reasons, an erroneous input occurs due to an erroneous operation of the user's key.
On the other hand, in Patent Document 1, when the key input on the touch panel is determined by the input key determination unit and stored in the key buffer, and the input of the correction key is detected by the correction operation detection unit, the key input and key immediately after that are detected. By comparing with the contents of the buffer, it is determined which key the user actually tried to press. And in patent document 1, the touch input acceptance range of the key in a touch panel is adjusted based on the determination result.
Further, for example, a method in which a user touches a predetermined display point on the screen, and a relationship between the display point and the touch point is examined and calibrated in advance can be considered.

JP 2000-66817 A

  By the way, in the technique disclosed in Patent Document 1, it is impossible to determine whether or not the error is caused by an erroneous operation (mistouch) of a user's key. There is a risk of adjusting the input acceptance range. Thereby, for example, there is a possibility that the touch input acceptance range of the key may be adjusted for a deletion operation for rewriting a sentence once keyed by the user into another sentence.

In addition, the above-described calibration method requires an operation of touching the screen in advance only for calibration regardless of actual use. However, such work is burdensome for the user and may deteriorate the feeling of use.
The object of the present invention is to solve these problems.

  In order to solve the above-described problem, according to an embodiment of the present invention, a symbol corresponding to each key based on a detection result of an operation detection area for each key displayed and displayed on a touch panel with a keyboard having a plurality of keys. In the information input device to which is input, when the input symbol is deleted, the deleted symbol holding unit temporarily holds the symbol, the symbol held in the deleted symbol holding unit, and the input after the deletion operation A deletion operation determination unit that determines whether or not the deletion operation has been performed in order to correct an erroneous input symbol caused by an erroneous operation of a key based on the number of symbols that do not match the determined symbol, and the deletion operation The detection region of a key corresponding to the symbol that is input after the deletion operation and is determined to be inconsistent in response to the determination unit determining that the deletion operation has been performed for the correction Possible to provide the information input apparatus characterized by having a detection area correcting unit which corrects for.

  Here, in the embodiment of the present invention, it is determined whether or not a deletion operation has been performed in order to correct an erroneous input symbol caused by an erroneous operation of the key based on the number of mismatched symbols, and caused by an erroneous operation of the key. If it is determined that a delete operation has been performed to correct the incorrect input symbol, the key detection area corresponding to the symbol input after the delete operation is corrected, and the delete operation is an incorrect input symbol due to an incorrect key operation. If it is determined that the processing is not performed for correcting the key, the key detection area corresponding to the symbol input after the deletion operation is maintained without correction.

  In the embodiment of the present invention, the symbol held in the deletion symbol holding unit with reference to a key arrangement table that defines key arrangement in the keyboard does not match the symbol input after the deletion operation. Whether the key corresponding to the symbol held in the deletion symbol holding unit and the key corresponding to the symbol input after the deletion operation are arranged adjacent to each other on the keyboard with respect to the arrangement relationship of keys between symbols. A key arrangement determination unit for determining, wherein the detection area correction unit is a symbol input after the deletion operation in response to determining that the key arrangement determination unit is arranged adjacent to the key arrangement determination unit; It is preferable to correct the detection area of the key corresponding to the mismatched symbol.

In the embodiment of the present invention, the detection area correction unit may detect a mismatch with respect to the symbol in the detection area of the key corresponding to the symbol input after the deletion operation and the mismatched symbol. It is preferable that the boundary adjacent to the key corresponding to the symbol held in the deleted symbol holding unit is moved in the direction in which the key is located.
Further, in an embodiment of the present invention, the relationship between the symbols in which the symbol held in the deletion symbol holding unit and the symbol input after the deletion operation do not match is changed from the symbol held in the deletion symbol holding unit. The correction frequency determination unit further determines whether or not the frequency of correction to the symbol input after the deletion operation is higher than a preset value, and the correction frequency determination unit includes the correction frequency determination unit. It is preferable that the detection area of the key corresponding to the symbol input after the deletion operation and corresponding to the mismatched symbol is corrected when it is determined that is higher than a preset value.

  In the embodiment of the present invention, the input number determination unit may further determine whether the number of inputs of the symbol input after the deletion operation and the mismatched symbol is larger than a preset value. And the detection region correction unit is a symbol input after the deletion operation in response to the determination that the input number determination unit determines that the input number is greater than a preset value, and the mismatch is determined to be inconsistent It is preferable to correct the detection area of the key corresponding to the symbol.

In the embodiment of the present invention, it is preferable that the deletion operation determination unit determines that the deletion operation has been performed for correction when the number of mismatched symbols is less than a preset threshold value. .
Further, according to the embodiment of the present invention, a keyboard having a plurality of keys is displayed on the touch panel and an operation on each displayed key is detected, and a corresponding symbol is input, and a deletion symbol holding unit, a deletion operation determination unit, and a detection area In the method of correcting the operation detection area for each key executed by the information input device having a correction unit, when the input symbol is deleted, the symbol is temporarily held by the deletion symbol holding unit The step and the deletion operation determination unit determine a symbol of an erroneous input caused by an erroneous operation of the key based on the number of symbols that are inconsistent between the retained symbol and the symbol input by operating the touch panel after the deletion operation. A step of determining whether or not the deletion operation has been performed for correction; and the detection area correction unit determines that the deletion operation has been performed for correction And a step of correcting the detection area of the key corresponding to the symbol that is input after the deletion operation and corresponding to the mismatched symbol according to the detection operation. Can be provided.

  Further, according to the embodiment of the present invention, a keyboard having a plurality of keys is displayed on the touch panel and an operation on each displayed key is detected, and a corresponding symbol is input, and a deletion symbol holding unit, a deletion operation determination unit, and a detection area In a program for correcting an operation detection area for each key executed by an information input device having a correction unit, when the input symbol is deleted, the symbol is temporarily held by the deletion symbol holding unit And a symbol of erroneous input caused by an erroneous operation of the key based on the number of symbols in which the deletion operation determination unit does not match the retained symbol and the symbol input by operating the touch panel after the deletion operation. Determining whether or not the deletion operation has been performed to correct the error, and the detection region correction unit performs the deletion operation to correct the correction. A computer-readable program that causes a computer to execute the step of correcting the detection area of a key that corresponds to the symbol that has been input after the deletion operation in response to the determination that it has been determined to be inconsistent Can provide.

According to the present invention, based on the number of the mismatched symbols, it is determined whether or not a deletion operation has been performed in order to correct an erroneous input symbol caused by an erroneous key operation, and according to the determination result By correcting the key detection area, it is possible to prevent the detection area from being corrected even when a deletion operation not caused by an erroneous operation of the user's key is performed.
Further, according to the present invention, the detection area is corrected on the condition that the input operation by the key, the deletion operation, and the re-input operation by the key are performed in that order, and the screen is displayed in advance only for calibration. The detection area can be automatically corrected by simply repeating the key input in actual use without requiring an operation to operate.

It is a block diagram which shows an example of a structure of the small information input device of this embodiment. It is a figure which shows an example of the functional block of the function which CPU can perform. It is a perspective view which shows an example of the external appearance of the small information input device of this embodiment. It is a figure which shows an example of the keyboard displayed on the screen part. It is a figure which shows an example of the keyboard in the case of carrying out portrait display on a screen part. It is a flowchart which shows the process sequence of the correction process in a small information input terminal. It is a figure which shows the notional structure of an input frequency counter. It is a figure which shows the conceptual structure of the buffer for input symbols, and the buffer for deletion symbols, Comprising: (a) shows the state which stored the input symbol in the buffer for input symbols, (b) is the symbol which deleted Is a diagram showing a state where is moved from the input symbol buffer to the deletion symbol buffer. It is a figure which shows an example of the table for adjacent key determination. It is a figure which shows the notional structure of an erroneous input frequency counter. It is a figure which shows the procedure of the process from the input of a symbol to deletion, (a) shows the state which stored the input symbol in the buffer for input symbols, (b) is the buffer for input symbols for the deleted symbol. It is a figure which shows the state which moved to the deletion symbol buffer. It is a figure which shows the procedure of the process which compares the newly input symbol and the deleted symbol, (a) shows the state which preserve | saved the symbol newly input after deletion in the buffer for input symbols, (b) shows a state in which symbols are extracted from the input symbol buffer and the deleted symbol buffer by operating the confirmation key, and (c) is a diagram showing a state when comparing in units of input symbols. It is a figure which shows the relationship between the keyboard (solid line) displayed on an LCD monitor, and the detection area (dashed line) of each key of a touch panel, (a) is the state before expansion of the detection area of the symbol key after correction. (B) is a figure which shows the state after expansion of the detection area | region of the key of the symbol after correction. It is a block diagram which shows an example of a structure of the mobile telephone of the modification of this embodiment. It is a figure which shows the structure which enables the process which compares the symbol newly input after deletion with the symbol deleted and preserve | saved in the deletion symbol buffer. It is a figure explaining the reverse conversion of a Romaji-kana conversion, and is a figure which shows the example at the time of character-converting "kyou" to "Kyo" by a Romaji-kana conversion. It is a figure which shows the state which has generate | occur | produced in the contact area | region of a user's fingertip, and the display area of a key. It is a figure which shows the relationship between the position of each key, and a user's finger | toe position, (a) shows the state which the user is pressing the key of "I", (b) is a user's fingertip. It is a figure which shows the state in which the contact area | region is located on the display area | region of the "U" key adjacent to the left.

(Configuration of the mobile information touch panel type small information input terminal)
The present embodiment is a touch panel type small information input terminal (hereinafter referred to as “small information input terminal”).
As a suitable example of the small information input terminal, there is an information input terminal for inputting information such as a destination provided in the in-vehicle car navigation device. In this case, for example, the information input terminal is connected to the car navigation device by wire or wirelessly. Needless to say, the small information input terminal is not limited to being applied in this way.

FIG. 1 shows an example of the configuration of the small information input terminal 1.
As shown in FIG. 1, a small information input terminal 1 includes an LCD (Liquid Crystal Display) control unit 2, an LCD monitor 3, a touch pad control unit 4, a touch pad 5, a CPU (Central Processing Unit) 10, and a storage device 20. Have
The LCD monitor 3 is controlled by the LCD control unit 2 to perform a predetermined display process.

In the present embodiment, the LCD monitor 3 is exemplified as a specific example, but the present invention is not limited to this, and any other display unit that can realize a touch panel may be used. For example, any known display device such as a plasma display can be used.
The touch pad 5 constitutes a so-called touch panel in combination with the LCD monitor 3. The touch pad 5 covers the entire surface of the LCD monitor 3 and detects a touch operation on the LCD monitor 3.

The touch pad 5 as an input device includes a resistive film type, but is not limited to this, and any surface acoustic wave type can be used as long as it can detect a touch operation on the LCD monitor 3. Alternatively, an input device can be configured by employing a capacitance method or the like.
When the touch pad 5 detects a touch operation, the touch pad control unit 4 specifies a position where the touch operation is performed from the detection signal, and outputs coordinate data of the specified operation position to the CPU 10. Thereby, CPU10 specifies contact operation from the information of the area | region which detected the contact with the touchpad 5, and performs the process corresponding to the contact operation.

The CPU 10 controls each part of the LCD control unit 2, the touch pad control unit 4, and the storage device 20. In this embodiment, the CPU 10 performs a process of correcting a detection area for detecting an operation of a keyboard key displayed on the LCD monitor 3, which will be described in detail later.
FIG. 2 shows an example of functional blocks of functions that can be executed by the CPU 10 for the process of performing the correction.

As illustrated in FIG. 2, the CPU 10 includes a deletion operation determination unit 11, a key arrangement determination unit 12, an input count determination unit 13, a correction frequency determination unit 14, and a detection area correction unit 15. These components for the correction process will be described in detail later.
The storage device 20 stores various data necessary for processing in the small information input terminal 1. The storage device 20 includes a storage unit 30 such as a program that can hold data even when the power is turned off, and a temporary storage unit 40 that can write data and temporarily hold the data.

The program storage unit 30 stores a program 31 and fixed data 32 used by the CPU 10 for various processes. Further, in the present embodiment, the adjacent key determination table 33 is stored in the program storage unit 30.
Here, as a suitable example of the program storage unit 30 in which such a program 31 or the like is stored, there is a ROM (Read-Only Memory). Moreover, although non-volatile memory | storage parts, such as EEPROM (Electrically Erasable Programmable Read-Only Memory), are mentioned, it cannot be overemphasized that it is not limited to these.

The program 31 may be stored in the storage device 20 from the beginning of the shipment of the small information input terminal 1, but is read from a storage medium such as a CD-ROM by the user's work after the shipment. It can also be stored in the storage unit 30 such as a program.
In addition, the temporary storage unit 40 is provided with an input symbol buffer 41, a deletion symbol buffer 42, an input number counter 43, and an erroneous input number counter 44.

  Here, as a suitable example of the temporary storage unit 40 in which such an input symbol buffer 41 and the like are provided, there is a RAM (Random Access Memory) in which the input symbol buffer 41 and the deletion symbol buffer 42 are provided. However, it goes without saying that the present invention is not limited to this. In addition, examples of providing the input number counter 43 and the erroneous input number counter 44 include a nonvolatile storage unit such as an EEPROM, but it goes without saying that the present invention is not limited thereto.

The CPU 10 reads the program 31, the fixed data 32, and the adjacent key determination table 33 from the program storage unit 30 to the temporary storage unit 40 as necessary, and performs various processes. Further, the CPU 10 performs various processes using the input symbol buffer 41 and the like stored in the temporary storage unit 40.
The adjacent key determination table 33, the input symbol buffer 41, the deletion symbol buffer 42, the input number counter 43, and the erroneous input number counter 44 stored in the storage device 20 will be described in detail later.

FIG. 3 shows an example of the appearance of the small information input terminal 1.
As shown in FIG. 3, the small information input terminal 1 has a casing 51 formed in a substantially thin plate shape. The casing 51 is provided with a screen portion (touch panel) 52 exposed on the main surface thereof. The screen unit 52 includes the touch pad 5 and the LCD monitor 3 disposed on the back surface thereof.

The small information input terminal 1 of this embodiment can display a keyboard (virtual keyboard) on such a screen unit 52.
FIG. 4 shows an example of a keyboard displayed on the screen unit 52 (LCD monitor 3).
As shown in FIG. 4, since the screen unit 52 is downsized (for example, around 3 inches in a diagonal dimension), the keyboard is displayed on the screen unit 52 without forming a gap between the keys. The keyboard layout shown in FIG. 4 is a so-called QWERTY layout.

  As shown in FIG. 4, when the diagonal dimension of the screen part 52 is 3.5 inches, the vertical dimension is about 55 mm and the horizontal dimension is about 110 mm. Then, as shown in FIG. 4, when the screen portion 52 is displayed horizontally and the keyboard is displayed in the lower half area of the screen portion 52, the display size of each key is about 11 mm (horizontal) at the maximum. Dimension) × 9 mm (vertical dimension). Further, if a confirmation key, a cancel key, etc., which are necessary for practical use, are added, each key becomes even smaller.

FIG. 5 shows an example of a keyboard when the screen portion 52 is displayed vertically.
As shown in FIG. 5, the maximum display size of each key is about 5.5 mm (horizontal dimension) × 9 mm (vertical dimension), and the horizontal dimension of each key is further reduced as compared to the case of displaying horizontally. .
In the above-described embodiment, the QWERTY layout is given as a specific example of the keyboard layout. However, the keyboard layout is not limited to this, and other keyboard layouts such as a JIS layout can be applied. Needless to say, the dimensions of each key are not limited to the above-described embodiment.

  When a touch operation is performed on any key of the keyboard displayed on the screen unit 52 (LCD monitor 3) in this manner, the touch pad 5 and the touch pad control unit 4 specify the position of the touch operation. The coordinate data of the specified operation position is output to the CPU 10. And CPU10 performs the process according to the key specified from the coordinate data, ie, the process according to the key of the position where contact operation was carried out. For example, when a key operation for inputting a symbol is performed, the CPU 10 stores the symbol corresponding to the operated key in the temporary storage unit 40 of the storage device 20 and displays the stored symbol on the screen unit 52 (LCD monitor). 3) in the display area (for example, the upper half area of FIG. 4).

Through such processing, the user can input a symbol and input a sentence or the like to the small information input terminal 1 by bringing a finger into contact with the upper surface of the screen unit 52.
Here, for example, the small information input terminal 1 stores information such as a table and parameters in which each key and an area (detection coordinates) where contact is detected on the touchpad 5 are associated with each other, such as a storage device 20 (for example, a program or the like) Part 30). Then, the CPU 20 refers to such information and identifies the key that has been touched from the detection area in which the touch of the touch pad 5 is detected.

In addition, as in the case of a general desktop keyboard, English characters and hiragana characters associated with each key are representative as symbols in the present embodiment. However, the present invention is not limited to this, and the symbols may include special symbols such as “$” and “%”, as in a general desktop keyboard.
Incidentally, as described above, the display size of each key of the keyboard displayed on the screen unit 52 is small. As a result, the user may erroneously operate the key and input erroneously. For this reason, in this embodiment, the key detection area can be corrected.

(Deletion operation determination procedure of small information input terminal of this embodiment)
FIG. 6 shows a processing procedure of correction processing in the small information input terminal 1 of the present embodiment. The processing contents of each component of the CPU 10 shown in FIG. 2 will also be described along this processing procedure.
As shown in FIG. 6, the CPU 10 first determines in step S <b> 1 whether or not there is an input (contact operation on the key) by any key of the keyboard displayed on the screen unit 52. When there is a key input, the CPU 10 proceeds to step S2.

In step S2, the CPU 10 determines a key that has been input. Specifically, the CPU 10 determines that the input key is a key for inputting a symbol (for example, an English character key), a confirmation key (for example, “Enter” key), and a delete key (for example, “Back Space” key). ) If the input key is a symbol input key, the CPU 10 proceeds to step S3. If the input key is a delete key, the CPU 10 proceeds to step S6. On the other hand, when the input key is the confirmation key, the CPU 10 proceeds to step S9.
In step S <b> 3, the CPU 10 adds 1 to the input count of the input symbol in the input count counter 43.

FIG. 7 shows a conceptual configuration of the input number counter 43.
As shown in FIG. 7, the input number counter 43 is configured by associating a symbol corresponding to each key with an input number, and the CPU 10 inputs the input symbol in such an input number counter 43. Add 1 to the number of times.
In subsequent step S <b> 4, the CPU 10 stores the input symbol in the input symbol buffer 41.

FIG. 8 shows a conceptual configuration of the input symbol buffer 41 and the deletion symbol buffer 42.
As shown in FIG. 8A, the CPU 10 stores the key input symbol in the input symbol buffer 41. In this example, “a”, “b”, “c”, “d”, “e” are key-inputted in this order, and the CPU 10 inputs symbols to the input symbol buffer 41 in the order of input. Save sequentially. Here, a suitable example of the input symbol buffer 41 is a FILO (First-In Last-Out) stack type buffer, but it goes without saying that the present invention is not limited to this.

  In the subsequent step S5, the CPU 10 performs a display reflecting the input symbol, that is, the symbol stored in the input symbol buffer 41 in step S4, on the screen unit 52 (LCD monitor 3). For example, the CPU 10 displays the input English character as it is on the screen unit 52 (LCD monitor 3), or displays the converted character such as Roman-Kana conversion for the input English character on the screen unit 52. . And CPU10 starts a process again from step S1.

On the other hand, if the input key is a delete key, that is, if the symbol is deleted, the CPU 10 moves the symbol from the input symbol buffer 41 to the deleted symbol buffer 42 in step S6.
As shown in FIG. 8B, the CPU 10 extracts a symbol from a new one stored in the input symbol buffer 41 and stores it in the deleted symbol buffer 42. A suitable example of the deletion symbol buffer 42 is a first-in first-out (FIFO) queue type buffer, but it goes without saying that the present invention is not limited to this.

In subsequent step S <b> 7, the CPU 10 sets a correction pointer in the input symbol buffer 41. Specifically, the CPU 10 sets a correction pointer at a position of the input symbol buffer 41 where the last moved symbol is stored in the deletion symbol buffer 42.
In the subsequent step S8, the CPU 10 performs a display reflecting the deleted symbol on the screen unit 52 (LCD monitor 3). And CPU10 starts a process again from step S1.

  For example, as shown in FIG. 8, “a”, “b”, “c”, “d”, “e” are continuously input in these orders, and then the delete key is operated continuously. A case where “e”, “d”, and “c” are deleted will be described. In this case, as shown in FIG. 8B, the CPU 10 moves “e”, “d”, and “c” from the input symbol buffer 41 to the deletion symbol buffer 42 in this order by the processing of step S7. Moving. Then, as shown in FIG. 8B, the CPU 10 sets a correction pointer at the position where “c” in the input symbol buffer 41 is stored by the process of step S <b> 8.

As shown in FIG. 8A, the correction pointer is normally set at the end of the input symbol buffer 41 (after the last input symbol) (before the delete key is operated). ing.
On the other hand, in step S9 that proceeds when the input key is the confirmation key, the CPU 10 determines whether or not there is data (deleted symbols) in the deleted symbol buffer 42. This determination is equivalent to determining whether or not the processing of steps S6 to S8 has been executed. If the CPU 10 determines that there is data in the deletion symbol buffer 42, the process proceeds to step S10. If the CPU 10 determines that there is no data in the deletion symbol buffer 42, the process proceeds to step S19.

In step S19, the CPU 10 performs a key input confirmation process. For example, the CPU 10 determines character conversion such as Roman character-kana conversion for the display on the screen unit 52. Then, the CPU 10 proceeds to step S20.
In step S20, the CPU 10 initializes the input symbol buffer 41, the deleted symbol buffer 42, and the correction pointer. As a result, the small information input terminal 1 can respond to the next key input after the confirmation process using the symbol stored in the input symbol buffer 41. Then, the CPU 10 ends the process shown in FIG. 6 (starts the process again from step S1).

  On the other hand, in step S10, the CPU 10 compares the data newly stored in the input symbol buffer 41 with the data moved to the deletion symbol buffer 42, and detects the difference. Specifically, the CPU 10 compares the symbols stored in the input symbol buffer 41 after the correction pointer, that is, the re-input symbols with the symbols stored in the deletion symbol buffer 42 in units of input symbols. Detect differences (mismatched symbols). Thereby, the CPU 10 acquires the number of corrected symbols (the number of mismatched symbols) and the symbols before and after the correction. For example, if “a”, “g”, and “c” are re-input after deleting “a”, “b”, and “c”, the number of corrected symbols (number of mismatched symbols) is It becomes “1”. The symbol before correction is “b”, and the symbol after correction is “g”.

  In the subsequent step S11, the CPU 10, particularly the deletion operation determination unit 11, determines whether or not the number of corrected symbols acquired in step S10 is less than a preset correction symbol number determination threshold value. The threshold value for determining the number of correction symbols is used to determine whether or not a deletion operation (deletion key operation) has been performed in order to correct an erroneous input symbol caused by an erroneous operation of the user's key. For example, the correction symbol number determination threshold is preset as an experimental value, an empirical value, or a theoretical value. For example, the correction symbol number determination threshold value is any value between 3 and 5 (pieces). More preferably, the threshold value for determining the number of correction symbols is 4 (pieces).

  When the deletion operation determination unit 11 determines that the number of corrected symbols is less than the correction symbol number determination threshold value (number of corrected symbols <corrected symbol number determination threshold value), the deletion operation determination unit 11 is caused by an erroneous operation of the key. Assuming that a deletion operation (deletion key operation) has been performed to correct the erroneous input symbol, the process proceeds to step S12. Further, when the deletion operation determination unit 11 determines that the number of corrected symbols is equal to or greater than the correction symbol number determination threshold value (number of corrected symbols ≧ correction symbol number determination threshold value), the deletion operation is a key. As a result of a change with the intention of the user (for example, a change of the entire input sentence) move on.

According to the process of step S11, when the threshold value for determining the number of corrected symbols is set to 4 in the preferred example, the deletion operation determining unit 11 determines that the number of corrected symbols is 3 (pieces). Therefore, it is determined that the deletion operation has been performed in order to correct the erroneous input symbol caused by the erroneous operation of the key.
Here, when the character conversion is romaji-kana conversion as in the present embodiment, key input (for example, “kyo”) of at least three romaji characters is converted to kana (for example, “kyo”). A key input of four or more Roman letters increases the possibility of forming words or phrases. For this reason, when four or more characters are deleted by the deletion operation, it is highly likely that a word or a phrase has already been formed, and the deletion operation corrects a symbol of an erroneous input caused by a key operation error. There is a high possibility that it was not done. That is, for example, there is a high possibility that the deletion operation is performed due to a change with the user's intention. On the other hand, if the deletion operation has completed the deletion of 3 characters or less, there is a high possibility that the deletion operation has been performed before the word or phrase is formed, and the deletion operation is an erroneous input of a symbol due to an erroneous operation of the key. It is likely to be for correction.

  In the present embodiment, the correction symbol number determination threshold value is determined so that the determination is made more appropriately under the characteristics of such Romaji-kana conversion. 1 to 5 (pieces), and the threshold for determining the number of correction symbols is preferably set to 4 (pieces). For this reason, in the case of character conversion other than Romaji-Kana conversion, the threshold value for determining the number of correction symbols may be set in consideration of the character conversion characteristics.

In step S12, the CPU 10 subtracts 1 from the number of inputs of the uncorrected symbol acquired in step S10, that is, an erroneously input symbol (input count counter 43).
In the subsequent step S13, the CPU 10, particularly the key arrangement determination unit 12, determines whether or not the key of the corrected symbol acquired in step S10 is adjacent to the key of the symbol before correction in the keyboard layout.

FIG. 9 shows an example of an adjacent key determination table 33 for obtaining information on adjacent keys in the QWERTY key array.
As shown in FIG. 9, the adjacent key determination table 33 is a table in which the adjacent relationship of each key constituting the keyboard is registered. That is, the adjacent key determination table 33 shows the correspondence between the symbol of each key and the symbol of the key adjacent to each key in the “up”, “down”, “left”, and “right” directions. Show. With this adjacent key determination table 33, the key arrangement determination unit 12 allows the key of the symbol after correction to be adjacent to the key of the symbol before correction in the keyboard layout ("up", "down", "left", Or a key adjacent to “right”).

If the key arrangement determination unit 12 determines that the key of the symbol after correction is adjacent to the key of the symbol before correction in the keyboard layout, the process proceeds to step S14. If the key arrangement determination unit 12 determines that the key of the symbol after correction is not adjacent to the key of the symbol before correction in the keyboard layout, the process proceeds to step S18.
Since the adjacent key determination table 33 shown in FIG. 9 is configured according to the QWERTY layout, when processing other keyboard layouts such as the JIS layout, the adjacent key determination table 33 is configured according to the keyboard layout. Needless to say.

In step S <b> 14, the CPU 10 adds 1 to the number of erroneous inputs of the uncorrected symbol that is determined to be adjacent to the key of the corrected symbol in the erroneous input number counter 44.
FIG. 10 shows a conceptual configuration of the erroneous input number counter 44.
As shown in FIG. 10, in the erroneous input number counter 44, keys adjacent to each key (in this case, each key after correction) in the “up”, “down”, “left”, and “right” directions. The number of erroneous inputs (in this case, the key before correction) is associated. Thereby, when the key of the symbol before correction is adjacent to the key of the symbol after correction, the CPU 10 is one of “up”, “down”, “left”, and “right” before the correction. 1 is added to the number of erroneous input of the symbol.

  In the subsequent step S15, the CPU 10, in particular, the input count determination unit 13 refers to the input count counter 43 to determine whether or not the corrected symbol input count is larger than a preset input count determination threshold. To do. The threshold value for determining the number of times of input is a threshold value for determining the number of samples of key operations, that is, the parameter of information used for calculating the correction frequency described later. For example, the threshold value for determining the number of times of input is set in advance as an experimental value, an empirical value, or a theoretical value. If the input count determination unit 13 determines that the input count of the corrected symbol is larger than the input count determination threshold (input count> input count determination threshold), the process proceeds to step S16. If the input count determination unit 13 determines that the input count of the corrected symbol is equal to or less than the input count determination threshold (input count ≦ input count determination threshold), the process proceeds to step S18.

For example, immediately after the purchase of the small-sized information input terminal 1, the user is unfamiliar with the operation of the device, so that there are many misoperations of the keys. Since it is conceivable to decrease, the threshold value for determining the number of times of input can be reduced with the passage of time.
In step S <b> 16, the CPU 10, particularly the correction frequency determination unit 14, determines whether the direction-specific error input rate for the corrected symbol is greater than a preset direction-specific error input determination threshold. Here, the erroneous input rate by direction for the corrected symbol is the number of erroneous input of the symbol before correction, which is added in step S14, assuming that the key is adjacent to the key of the corrected symbol. Is divided by the total number of erroneous inputs of all keys adjacent to the key of the symbol after the correction. The erroneous input rate by direction for the corrected symbol is a correction frequency in which the symbol before correction is corrected from the symbol before correction. Therefore, the direction-specific erroneous input determination threshold value is a threshold value for determining the frequency. For example, the direction-specific erroneous input determination threshold value is set in advance as an experimental value, an empirical value, or a theoretical value.

  The correction frequency determination unit 14 determines that the direction-specific erroneous input rate corresponding to the corrected symbol is larger than the direction-specific erroneous input determination threshold (direction-specific erroneous input rate> direction-specific erroneous input determination threshold). If it determines, it will progress to step S17. Further, the correction frequency determination unit 14 determines that the direction-specific erroneous input rate corresponding to the corrected symbol is equal to or less than the direction-specific erroneous input determination threshold (direction-specific erroneous input rate ≦ direction-specific erroneous input determination threshold). If it determines, it will progress to step S18.

  In step S <b> 17, the CPU 10, particularly the detection area correction unit 15, corrects the detection area of the corrected symbol key. Specifically, the detection area correction unit 15 determines that the corrected symbol key (finally, the direction-specific erroneous input rate is larger than the direction-specific erroneous input determination threshold in the process of step S16). The boundary of the current detection region (the outer periphery of the detection region) of the corrected symbol key) is moved in the direction in which the key of the uncorrected symbol is located, and correction is performed to enlarge the detection region.

Here, the boundary of the detection area is moved by correcting information such as a table and parameters for specifying the above-described key.
In this embodiment, the key detection area is corrected by correcting information such as a table and parameters. However, the present invention is not limited to this, and any other correction is possible as long as the key detection area is corrected. It goes without saying that this method can be applied.

In the present embodiment, as the detection area correction, each detection area can be shifted for the entire keyboard in a direction that coincides with the direction from the corrected symbol key to the uncorrected symbol key.
In the present embodiment, simultaneously with the correction of the detection area as described above, the display area of each key may be enlarged on the screen section 52, or the display of the entire keyboard may be shifted on the screen section 52. it can.

  In subsequent step S <b> 18, the CPU 10 determines whether or not the processing after step S <b> 12 has been performed for all the corrected symbols. That is, when a plurality of symbols are corrected (when there are a plurality of mismatched symbols), the processing after step S12 is performed for all the plurality of symbols corresponding to the corrected number (the value acquired in step S10). It is determined whether or not. If the CPU 10 determines that the processes after step S12 have been performed for all the corrected symbols, the process proceeds to step S19. If the CPU 10 determines that the processing after step S12 has not been completed for all the corrected symbols, the CPU 10 starts the processing again from step S12 for the corrected symbols that have not yet been completed.

(Operation example)
Here, the user tried to input “tenkigaii” in order to input the sentence “good weather” (weather is good), but the CPU 10 has detected the actual touch operation detection state on the touchpad 5. , “Tenkigaui” (“u” instead of “i”) is input, that is, “Tengigai” (“U” instead of “I”) is input as a character after character conversion. A case will be described as an example in which the user deletes “igaui” and re-enters “igaii” in response to such an erroneous input.

FIG. 11 shows the procedure of processing from input of symbols to deletion. FIG. 12 shows a procedure of processing in which a new symbol is input after deletion, and the newly input symbol is compared with the deleted symbol.
As illustrated in FIG. 11A, the CPU 10 performs “t”, “e”, “n”, “k”, “i”, “g”, “a” on the keyboard displayed on the screen unit 52. When the keys corresponding to “u” and “i” are operated, these symbols are stored in the input symbol buffer 41 in this order (step S4). Further, at this time, the CPU 10 adds 1 to the number of input times of each input symbol, or performs a display reflecting the input symbol on the screen unit 52 (LCD monitor 3) (step S3, step S5). .

  Thereafter, as shown in FIG. 11B, when the delete key is operated, the CPU 10 selects “i”, “u”, “a”, “g”, “i” according to the number of operations. The symbols are moved from the input symbol buffer 41 to the deletion symbol buffer 42 in this order (step S6). Further, as shown in FIG. 11B, the CPU 10 sets a correction pointer at the position of the input symbol buffer 41 where the last moved symbol is stored in the deletion symbol buffer 42 (step S7). At this time, the CPU 10 performs a display reflecting the deleted symbol on the screen unit 52 (LCD monitor 3) (step S8).

  Then, as shown in FIG. 12A, the CPU 10 determines that each key corresponding to “i”, “g”, “a”, “i”, “i” of the keyboard displayed on the screen unit 52 is displayed. When operated for re-input, these symbols are stored in the input symbol buffer 41 (step S4). At this time, the first input “i” is stored in the input symbol buffer 41 at the position of the correction pointer.

  Then, as shown in FIG. 12B, when the enter key is operated, the CPU 10 saves the symbols saved in the input symbol buffer 41 after the correction pointer and the symbols saved in the deletion symbol buffer 42. And take out. Then, as shown in FIG. 12C, the CPU 10 compares the input symbols and detects the difference (steps S9 and S10). Thereby, the CPU 10 acquires “u” as a symbol before correction, acquires “i” as a symbol before correction, and acquires “1” as the number of corrected symbols.

  When the number of corrected symbols is less than the correction symbol number determination threshold, the CPU 10 subtracts 1 from the number of input times of the symbol “u” before correction (steps S11 and S12). Furthermore, the CPU 10 refers to the adjacent key determination table 33 and determines that the key with the corrected symbol “i” is adjacent to the key with the uncorrected symbol “u”. 1 is added to the number of erroneous inputs of “u” (steps S13 and S14). That is, the CPU 10 adds 1 to the number of erroneous inputs of the uncorrected symbol “u”, which is the key adjacent to the “left” direction of the corrected symbol “i” key.

Then, the CPU 10 uses the corrected number of inputs of the symbol “i” to be larger than the threshold value for determining the number of input times, and the direction-specific error input rate for the corrected symbol “i” is used to determine the direction-specific error input. If it is determined that the threshold value is larger than the threshold value, the detection area of the key with the corrected symbol “i” is corrected (step S15, step S16, step S17).
Here, the erroneous input rate by direction indicates the number of erroneous inputs of the symbol “u” before correction by the symbol “o” of the key adjacent in the “right” direction to the key of the symbol “i” after correction. , The number of erroneous inputs of the key symbol “u” adjacent in the “left” direction, the number of erroneous inputs of the key symbol “8” adjacent in the “up” direction, and the “down” direction The value obtained by dividing by the total number of erroneous inputs of the adjacent key symbol “k”.

In addition, the detection area of the key with the symbol “i” after correction is enlarged by a predetermined size in the direction in which the key with the symbol “u” before correction is located.
FIG. 13 shows the relationship between the keyboard (solid line) displayed on the LCD monitor 3 and the detection area (broken line) of each key on the touchpad 5.
As shown as a change from FIG. 13A to FIG. 13B, the detection area R1 of the key with the symbol “i” after correction is set in advance in the direction in which the key with the symbol “u” before correction is located. Enlarged by size. In this example, the detection area R2 of the key with the symbol “u” before correction is reduced accordingly.

  As described above, in the small information input terminal 1, the number of corrected symbols is less than the correction symbol number determination threshold value, and the key of the corrected symbol is adjacent to the key of the symbol before correction. If the number of input times of the corrected symbol is larger than the threshold value for determining the number of input times, and the erroneous input rate by direction for the corrected symbol is larger than the threshold value for erroneous input determination by direction. Then, the detection area of the corrected symbol key is corrected.

  In this embodiment, the deletion symbol buffer 42 implements, for example, a deletion symbol holding unit. The adjacent key determination table 33 implements, for example, a key arrangement table.

(Effect of this embodiment)
In the present embodiment, the small information input terminal 1 has a deletion symbol buffer 42 for storing a deleted symbol when the key-input symbol is deleted, and the deletion symbol buffer 42 stores the symbol. Based on the number of symbols that do not match between the symbol and the key entered after the delete operation, whether or not the delete operation has been performed to correct the erroneous input symbol caused by the user's erroneous key operation It is determined (step S11).

  When the small information input terminal 1 determines that the deletion operation has been performed in order to correct the erroneous input symbol caused by the erroneous operation of the key, it is a symbol that has been input after the deletion operation and has not been matched. Is corrected (step S17), and if it is determined that the deletion operation is not performed to correct an erroneous input symbol caused by an erroneous operation of the key, the detection region is corrected as such. Instead, the current value is maintained (the process of step S17 is not performed).

As described above, in this embodiment, the erroneous input symbol due to the key misoperation is corrected based on the determination result of whether or not the delete operation has been performed to correct the erroneous input symbol due to the key misoperation. Therefore, the detection area for the operation on the key can be corrected only when the deletion operation is performed.
Therefore, in the present embodiment, it is possible to prevent the detection area from being corrected even when a deletion operation not caused by an erroneous operation of the user's key is performed.

In this embodiment, the detection area is corrected on the condition that the input operation using the key, the deletion operation, and the re-input operation using the key are performed in that order, and the screen is operated in advance only for calibration. The detection area can be automatically corrected by simply repeating the key input in actual use without requiring any work to be performed.
Furthermore, in the present embodiment, various problems such as finger shapes and individual differences in operation methods when touching, displacement of the pressed position depending on the viewing direction are solved by correcting the detection area, and even with a minimal touch screen. Highly accurate input can be realized. And, by increasing the input accuracy, the user can operate keys with the same layout as the large desktop keyboard with the same operation feeling as the large desktop keyboard, even on a tiny keyboard displayed on the touch panel. There is no need to acquire skills for operation for small devices.

In the present embodiment, since the above-described processing in the small information input terminal 1 can be realized by a program, it is not necessary to add a special function to the hardware side of the small information input terminal 1.
In the present embodiment, the small information input terminal 1 corrects the key detection area when the key of the symbol before correction and the key of the symbol after correction are arranged adjacent to each other on the keyboard ( Step S13, Step S17).

Thereby, in this embodiment, a detection area | region can be correct | amended only when the adjacent key with high possibility that a key will be misoperated is operated.
Further, in the present embodiment, the small information input terminal 1 moves the boundary of the corrected symbol key detection area in the direction in which the corrected symbol key is located, and detects the corrected symbol key detection area. Is corrected (step S17).

As a result, in the present embodiment, the corrected key detection area of the symbol can be corrected to the adjacent key side in accordance with an erroneous operation of the key.
Further, in the present embodiment, the small information input terminal 1 uses the correction frequency from a specific symbol when the erroneous input rate by direction for the corrected symbol is greater than the threshold for erroneous input determination by direction, that is, Is high, the key detection area is corrected (step S16, step S17). That is, in the present embodiment, the small information input terminal 1 corrects the key detection area using the correction frequency as a weight.

Thereby, in this embodiment, it is possible to prevent inconvenience caused by correcting the detection area at a stage where the number of corrections is small, for example, correcting the detection area even for accidental key operation.
Further, in the present embodiment, the small information input terminal 1 corrects the detection area of the key of the corrected symbol when the number of input times of the corrected symbol is larger than the threshold for determining the number of input times (step) S15, step S17).

  Thereby, in the present embodiment, the detection area can be corrected by increasing the number of samples of key operations, that is, increasing the parameter of information used for calculating the correction frequency. As a result, in this embodiment, since the correction frequency can be set to a more appropriate value, the detection area is corrected even when the user performs a deletion operation such as rewriting a sentence once key-inputted to another sentence. Can be more reliably prevented.

  Further, in the present embodiment, it is possible to prevent the detection area from being corrected even when the number of key misoperations temporarily increases because the user is unfamiliar with the operation of the small information input terminal 1. In other words, in the present embodiment, the detection area of the key can be corrected only when the user has operated the key for a considerable number of times but has performed a deletion operation due to an erroneous operation of the key. ing.

Further, in the present embodiment, the small information input terminal 1 performs a deletion operation to correct an erroneous input symbol caused by an erroneous operation of the key when the number of corrected symbols is less than the correction symbol number determination threshold. Is determined to have been performed.
Thereby, in this embodiment, such a determination can be realized by a simple process.

(Modification 1 of this embodiment)
In this embodiment, regardless of whether or not the key of the symbol after correction is adjacent to the key of the symbol before correction (regardless of the result of the determination process in step S13), The key detection area can be corrected (step S17).
Even in such a modification of the present embodiment, the detection area is corrected even when the user performs a deletion operation for rewriting a sentence once key-inputted to another sentence, as in the above-described embodiment. Can be prevented.

(Modification 2 of this embodiment)
Further, in the present embodiment, regardless of the determination result using the threshold value for determining the number of times of input or the threshold value for erroneous input determination for each direction (regardless of the result of the determination process in step S15 or step S16), If the condition is satisfied, the key detection area can be corrected (step S17).
Even in such a modification of the present embodiment, the detection area is corrected even when the user performs a deletion operation such as rewriting a sentence once key-inputted by another sentence, as in the above-described embodiment. Can be prevented.

(Modification 3 of this embodiment)
Further, in the present embodiment, as shown in FIGS. 3 and 4, the present invention is not limited to the case where the keys are displayed adjacent to each other with no gap, and there is a gap between the keys. It can also be applied to keyboards. In this case, the small information input terminal corrects the detection area of the key of the symbol after correction, for example, moves the boundary of the detection area in the direction in which the key of the symbol before correction is located. In such a case, it is not necessary to change the boundary of the detection area of the key of the symbol before correction according to the correction of the detection area of the key of the symbol after correction.

(Modification 4 of this embodiment)
In the above-described embodiment, the small information input terminal has been described as an information input terminal included in an in-vehicle car navigation device as a preferred example, but it is needless to say that the present invention is not limited to this. For example, the configuration provided in the small information input terminal may be applied to the display unit of the car navigation device itself. The small information input terminal may be a device that includes a touch panel and functions as a single unit and can input information, and may be a large device. Further, as a modification of the present embodiment, a mobile terminal may be used.

FIG. 14 shows an example of the configuration of a mobile terminal according to a modification of the present embodiment.
As shown in FIG. 14, the mobile terminal 60 newly includes a wireless communication unit 61 that performs processing for outgoing and incoming calls via an antenna 62, a voice input / output microphone 63 and a speaker 64 for calling and the like. Prepare.
In such a portable terminal 60, when the touch panel is operated when a sentence such as an e-mail is created, the key detection area is corrected as necessary.

(Modification 5 of this embodiment)
In the above-described embodiment, comparison and difference detection are performed at the timing when the confirmation key is operated (steps S2 and S10). On the other hand, in the modification of the present embodiment, even when the enter key is not operated, comparison and difference detection are performed when a preset number of symbols are newly stored in the input symbol buffer 41. You can also.
In such a modification of the present embodiment, the detection area can be corrected in real time during the re-input operation after the deletion operation, and the detection area can be corrected early.

(Modification 6 of this embodiment)
In the present embodiment, a symbol newly input after deletion can be compared with the deleted symbol stored in the deletion symbol buffer 42 one by one.

FIG. 15 shows an example of a configuration for realizing the processing.
As illustrated in FIG. 15, the small information input terminal 1 includes a comparison unit 71, and the comparison unit 71 deletes a symbol that is newly input after deletion, and a deletion symbol stored in the deletion symbol buffer 42. A difference is detected by comparing each symbol. In such a configuration, a correction pointer is not necessary. In such a configuration, it is considered that it is difficult to determine whether the correction is due to an erroneous input due to an erroneous operation of the key or whether the correction is for a sentence intended by the user. By counting the obtained difference (number of mismatched symbols), it is possible to cope with it.

(Modification 7 of this embodiment)
In this embodiment, a marker that delimits the character conversion unit of a symbol can be inserted between the symbols and stored in the input symbol buffer 41.
For example, if “kyouhatenkigaii” is converted to a Roman-Kana character, “Kyoha Tenki is good”. In such a case, the CPU 10 stores in the input symbol buffer 41 as follows in the character conversion unit by the character conversion of the Romaji-Kana conversion, for example, at the timing of the automatic conversion of the Romaji-Kana conversion of the system. Insert a marker between the displayed symbols.
kyo + u + ha + te + n + ki + ga + i + i

Here, “+” is marker data that delimits the character conversion unit of Roman character-kana conversion in the input symbol buffer 41.
When the delete key is operated, the CPU 10 moves the deleted symbols to the deleted symbol buffer 42 while reversely converting the symbols delimited by the marker data “+” (step S6). At this time, the CPU 10 moves only the reversely converted symbol to the deletion symbol buffer 42 and does not move the marker data “+” to the deletion symbol buffer 42. Thereby, for example, the CPU 10 performs display after reverse conversion of Roman character-kana conversion (step S8), ignores the marker data “+”, compares the symbols, and detects the difference (step S10). ).

FIG. 16 shows an example in which “kyou” is converted into “Kyo” by Romaji-kana conversion.
As shown in FIG. 16, when there is no marker data, the CPU 10 displays “Kyo” when the delete key is operated once, and displays “Ki” when the delete key is operated twice.
On the other hand, as shown in FIG. 16, when there is marker data, when the delete key is operated once, the CPU 10 moves “u” to the delete symbol buffer 42 and “Kyo”. Display. Further, when the delete key is operated twice, the CPU 10 moves “o” to the delete symbol buffer 42 and displays “ky” or “ki”.

Thereby, the user can grasp | ascertain which symbol was deleted by operation of the deletion key by such a display. Further, such processing is consistent with the processing of the present embodiment performed in units of input symbols.
Although the embodiments of the present invention have been specifically described above, the scope of the present invention is not limited to the illustrated and described exemplary embodiments, and effects equivalent to those intended by the present invention. All embodiments that provide are also included. Further, the scope of the present invention is not limited to the combination of features of the invention defined by claim 1 but can be defined by any desired combination of specific features among all the disclosed features. .

  DESCRIPTION OF SYMBOLS 1 Small information input terminal, 2 LCD control part, 3 LCD monitor, 4 Touch pad control part, 5 Touch pad, 10 CPU, 11 Deletion operation determination part, 12 Key arrangement determination part, 13 Input frequency determination part, 14 Correction frequency determination 15, detection area correction unit, 20 storage device, 30 program storage unit, 33 adjacent key determination table, 40 temporary storage unit, 41 input symbol buffer, 42 deletion symbol buffer, 43 input count counter, 44 erroneous input Number counter, 52 screen (touch panel)

Claims (8)

In an information input device in which a symbol corresponding to each key is input based on a detection result of an operation detection area for each key displayed and displayed on a touch panel with a keyboard having a plurality of keys.
A deletion symbol holding unit that temporarily holds the input symbol when the input symbol is deleted; and
The deletion operation is performed in order to correct an erroneous input symbol caused by an erroneous key operation based on the number of symbols that do not match between the symbol held in the deletion symbol holding unit and the symbol input after the deletion operation. A delete operation determination unit for determining whether or not
The detection area of the key corresponding to the symbol that is input after the deletion operation and is not matched in response to the deletion operation determination unit determining that the deletion operation has been performed for the correction A detection area correction unit for correcting
An information input device comprising: With reference to a key arrangement table that defines the arrangement of keys on the keyboard, the arrangement relationship of the keys between the symbols in which the symbols held in the deletion symbol holding unit and the symbols input after the deletion operation do not match A key arrangement determining unit for determining whether or not a key corresponding to the symbol held in the deletion symbol holding unit and a key corresponding to the symbol input after the deletion operation are arranged adjacent to each other on the keyboard; Have
The detection area correction unit is a key that is input after the deletion operation in response to the key arrangement determination unit determining that the key arrangement determination unit is arranged adjacent to the key, and corresponds to the mismatched symbol. The information input device according to claim 1, wherein the detection area is corrected.   The detection area correction unit is held in the deletion symbol holding unit that is a symbol input after the deletion operation and that is not matched to the symbol in the detection region of the key corresponding to the symbol that is not matched. The information input device according to claim 1 or 2, wherein a boundary adjacent to a key corresponding to the symbol is moved in a direction in which the key is located. Regarding the relationship between the symbols in which the symbol held in the deleted symbol holding unit and the symbol input after the deleting operation do not match, the symbol held in the deleted symbol holding unit is changed to the symbol input after the deleting operation. A correction frequency determination unit that determines whether the corrected frequency is higher than a preset value;
The detection area correction unit corresponds to a symbol that is input after the deletion operation in response to the correction frequency determination unit determining that the correction frequency is higher than a preset value and that is not matched. The information input device according to claim 1, wherein the detection area of the key to be corrected is corrected. An input number determination unit that determines whether or not the number of inputs of the symbol input after the delete operation and the mismatched symbol is greater than a preset value;
The detection area correction unit corresponds to the symbol that is input after the deletion operation and is not matched in response to the input number determination unit determining that the input number is larger than a preset value. The information input device according to claim 1, wherein the detection area of the key to be corrected is corrected.   6. The deletion operation determination unit according to claim 1, wherein the deletion operation determination unit determines that the deletion operation has been performed for the correction when the number of the mismatched symbols is less than a preset threshold value. The information input device according to claim 1. A keyboard having a plurality of keys is displayed on the touch panel and an operation on each displayed key is detected, and a corresponding symbol is input. The information input device has a deletion symbol holding unit, a deletion operation determination unit, and a detection area correction unit. In the method of correcting the operation detection area for each key,
When the input symbol is deleted, the symbol is temporarily held by the deleted symbol holding unit;
The deletion operation determination unit corrects a symbol of an erroneous input caused by an erroneous operation of a key based on the number of symbols that do not match between the retained symbol and the symbol input by operating the touch panel after the deletion operation. Determining whether or not the delete operation has been performed;
The detection of the key corresponding to the symbol that is input after the deletion operation and is not matched in response to the detection region correction unit determining that the deletion operation has been performed for the correction Correcting the area; and
A method for correcting a detection area of an information input device, comprising: A keyboard having a plurality of keys is displayed on the touch panel and an operation on each displayed key is detected, and a corresponding symbol is input. The information input device has a deletion symbol holding unit, a deletion operation determination unit, and a detection area correction unit. In the program for correcting the operation detection area for each key,
When the input symbol is deleted, the symbol is temporarily held by the deleted symbol holding unit;
The deletion operation determination unit corrects a symbol of an erroneous input caused by an erroneous operation of a key based on the number of symbols that do not match between the retained symbol and the symbol input by operating the touch panel after the deletion operation. Determining whether or not the delete operation has been performed;
The detection of the key corresponding to the symbol that is input after the deletion operation and is not matched in response to the detection region correction unit determining that the deletion operation has been performed for the correction Correcting the area; and
A computer-readable program that causes a computer to execute.

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