JPH08212305A - Dictionary registering method, and method and device for character recognition - Google Patents

Abstract

PURPOSE: To improve the character recognition rate by making the registration of a character pattern to a character recognition dictionary-for an individual always effective. CONSTITUTION: An individual dictionary generation part 33 registers a handwritten character pattern inputted from an input part 32 and the character code of the character pattern in the individual character recognition dictionary 4b. Then, a recognition dictionary operation part 35 searches a standard character recognition dictionary 4a for a registered character pattern which is similar to the handwritten character pattern and writes a marker that makes a character recognition part 34 not refers to the similar character pattern in the standard character recognition dictionary 4a in a dictionary nonreference table 4c thereafter when the similar character pattern is found. Consequently, the character recognition part 34 performs character recognition by using only the character pattern registered in the individual character recognition dictionary 4b, so the registered character pattern and its similar pattern are not mixed up and the character recognition rate can surely be improved by registering the character pattern in the individual recognition dictionary 4b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a character recognition apparatus for recognizing characters input by handwriting, and particularly to a dictionary registration method and a dictionary for registering a pattern desired by a user in a personal character recognition dictionary. The present invention relates to a character recognition method for recognizing a character using a personal character recognition dictionary in which the pattern is registered by the registration method.

[0002]

2. Description of the Related Art Conventionally, a handwritten character input device in which a display device and a coordinate input device are integrally laminated is capable of inputting information as if writing a character or a figure on a paper with a pen, and thus it has been used recently in various fields. It's starting to happen. Along with this, even devices that used to use the keyboard as an input device to create text by inputting characters, etc., can be input in the form of coordinate point sequence information using a stylus pen on a transparent tablet without using the keyboard. By recognizing that information as characters, characters have been input.

Here, the method of recognizing handwritten characters is to match the coordinate information input by the user with a plurality of character patterns registered in the character recognition dictionary in advance, and obtain the registered character closest to the input coordinate information. Many recognition methods have been proposed, including a method of using recognition candidates. However, the current situation is that a satisfactory character recognition rate has not yet been obtained by any of the recognition methods.

Therefore, in order to improve the above-mentioned character recognition rate, in addition to a character recognition dictionary given in advance, a personal character recognition dictionary that the user can personally register is prepared, and this personal character recognition is prepared. The character recognition rate is improved by registering characters that are difficult to recognize when the character recognition dictionary is used as the dictionary.

However, when the user registers a new character pattern in the personal character recognition dictionary, a character pattern similar to the new character pattern exists in the patterns registered in the personal character recognition dictionary in the past. Or if there is a similar character pattern in the standard character recognition dictionary,
Since a pattern similar to the newly registered character pattern is confused, there is a problem that the recognition rate is rather deteriorated.

[0006]

In the conventional character recognition device, a character pattern which is erroneously recognized by the character pattern in the standard character recognition dictionary is registered in the personal character recognition dictionary to improve the character recognition rate. Is being done.
However, if there is a character pattern similar to the newly registered character pattern in the patterns registered in the personal character recognition dictionary in the past or a character pattern similar to the standard character recognition dictionary exists, the new character pattern is newly added. Since a pattern similar to the registered character pattern is confused, there is a drawback that the recognition rate is rather deteriorated.

In view of the above drawbacks, the present invention uses a recognition dictionary registration method capable of improving the recognition rate by a character pattern registered in a personal character recognition dictionary, a character recognition method using this method, and a method using these methods. The object of the present invention is to provide a conventional character recognition device.

[0008]

According to a first aspect of the present invention, a handwritten character is recognized by referring to a character pattern registered in a standard character recognition dictionary or a personal character recognition dictionary, and the handwritten character is registered. In a dictionary registration method for registering the registered character pattern in a personal character recognition dictionary in a character recognition device having a function of registering as a pattern in the personal character recognition dictionary, the registration in the personal character recognition dictionary is performed. When a character pattern is registered, it is checked whether or not a character pattern similar to the registered character pattern exists in the standard character recognition dictionary, and if it exists, the similar character pattern in the standard character recognition dictionary is not referred at the time of character recognition. The method of registering information to be adopted is adopted.

According to a second aspect of the present invention, a character pattern in the character recognition dictionary that is similar to the registered character pattern is generated when the registered character pattern is character-recognized using the character pattern in the standard character recognition dictionary. The method of searching from the character patterns in the character recognition dictionary corresponding to the obtained character recognition candidates is adopted.

According to a third aspect of the present invention, the similarity between the registered character pattern and the character pattern in the standard character recognition dictionary is that the registered character pattern is character-recognized using the character pattern in the standard character recognition dictionary. A method is used that is decided based on the evaluation value obtained at that time.

According to the fourth aspect of the invention, the information for not referencing the similar character pattern existing in the character recognition dictionary at the time of character recognition corresponds to the dictionary number of the similar character pattern in the standard character recognition dictionary. The method is a marker that can be attached.

The invention of claim 5 employs a method in which a table is separately provided for storing a marker assigned in correspondence with the dictionary number. The invention of claim 6 employs a method in which the capacity of the table is fixed and the oldest registered marker is deleted each time the marker is newly registered.

The invention of claim 7 employs a method of registering the marker in the table or deleting the marker from the table by a user. According to the invention of claim 8, when the registered character pattern is registered in the personal character recognition dictionary, a character pattern similar to the registered character pattern is stored not only in the standard character recognition dictionary but also in the personal character recognition dictionary. A method is adopted in which whether or not it already exists is checked, and if it exists, information is registered so that a similar character pattern in the standard character recognition dictionary or the personal character recognition dictionary is not referred to during character recognition.

According to a ninth aspect of the present invention, the handwritten character is recognized by referring to the character pattern registered in the standard character recognition dictionary or the personal character recognition dictionary, and the handwritten character is used as the registered character pattern. A character recognition method in a character recognition device having a function of registering in the recognition dictionary by the dictionary registration method according to claim 1, wherein information for preventing reference to similar character patterns in the standard character recognition dictionary is registered. Whether or not the character pattern is registered, if it is registered, the character recognition is performed without referring to the corresponding character pattern in the character recognition dictionary.

According to a tenth aspect of the present invention, the handwritten character is recognized by referring to the character pattern registered in the standard character recognition dictionary or the personal character recognition dictionary, and the handwritten character pattern is used as the registered character pattern for the personal character recognition. In a character recognition device having a function of registering in a character recognition dictionary, a judging means for judging whether or not the registered character pattern is registered in the personal character recognition dictionary, and the personal character recognition dictionary in the personal character recognition dictionary by the judging means. When it is determined that the registered character pattern is registered, a search unit that searches the standard character recognition dictionary for a character pattern similar to the registered character pattern, and the character recognition dictionary by the search unit. If a similar character pattern is searched for in the standard character recognition dictionary, it is detected when the character is recognized. Registering means for registering information for not referring to similar character patterns, searching means for searching for a character pattern existing in the standard character recognition dictionary specified by the information registered by the registering means, and The character recognition means performs character recognition without referring to the character pattern searched by the searching means.

According to an eleventh aspect of the present invention, the search means uses the registered character pattern registered in the personal character recognition dictionary as the character pattern in the standard character recognition dictionary that is similar to the registered character pattern. It is configured to search from character patterns of character recognition candidates obtained when character recognition is performed using the character patterns in the recognition dictionary.

According to a twelfth aspect of the present invention, the similarity between the registered character pattern handled by the searching means and the character pattern in the standard character recognition dictionary is the same as the registered character pattern in the character recognition dictionary. It has a configuration that is determined based on an evaluation value obtained when a character is recognized by using it.

According to a thirteenth aspect of the present invention, the registering means registers the marker corresponding to the dictionary number of the similar character pattern in the standard character recognition dictionary searched by the searching means.

According to a fourteenth aspect of the present invention, the registration means is provided with a table for storing a marker attached corresponding to the dictionary number. According to a fifteenth aspect of the present invention, the capacity of the table provided in the registration means is fixed, and the registration means deletes the oldest registered marker each time the marker is newly registered.

According to the sixteenth aspect of the present invention, the marker is registered in the table provided in the registration means by the user or is deleted from the table.
In the invention of claim 17, the search means searches whether or not a character pattern similar to the registered character pattern already exists in the personal character recognition dictionary as well as in the standard character recognition dictionary. Thus, when it is searched for by the search means that a similar character pattern exists in the character recognition dictionary or the personal character recognition dictionary,
The registration means registers information that prevents a similar character pattern existing in the standard character recognition dictionary or the personal character recognition dictionary from being referred to during character recognition, and the search means registers the information registered by the registration means. The character pattern existing in the standard character recognition dictionary or the personal character recognition dictionary specified by is searched for.

[0021]

According to the dictionary registration method of the present invention, when the registered character pattern is registered in the personal character recognition dictionary, it is checked whether a character pattern similar to the registered character pattern exists in the standard character recognition dictionary. If it exists, information is registered so as not to refer to a similar character pattern in the standard character recognition dictionary at the time of character recognition.

In the dictionary registration method of the invention of claim 2,
The character pattern in the character recognition dictionary similar to the registered character pattern is the character corresponding to the character recognition candidate obtained when the registered character pattern is character-recognized using the character pattern in the standard character recognition dictionary. It is searched from among the character patterns in the recognition dictionary.

In the dictionary registration method of the invention of claim 3,
The similarity between the registered character pattern and the character pattern in the standard character recognition dictionary is determined based on the evaluation value obtained when the registered character pattern is character-recognized using the character pattern in the standard character recognition dictionary. To be

In the dictionary registration method of the invention of claim 4,
The information that does not refer to the similar character pattern existing in the character recognition dictionary at the time of character recognition is a marker attached to the dictionary number of the similar character pattern in the standard character recognition dictionary.

In the dictionary registration method of the invention of claim 5,
A marker provided corresponding to the dictionary number is stored in a table provided separately. In the dictionary registration method of the invention of claim 6, the capacity of the table is fixed and the oldest registered marker is deleted every time the marker is newly registered.

In the dictionary registration method of the invention of claim 7,
Register the marker in the table by the user,
Alternatively, it is deleted from the table. 9. The dictionary registration method according to claim 8, wherein when the registered character pattern is registered in the personal character recognition dictionary, a character pattern similar to the registered character pattern is generated not only in the standard character recognition dictionary but also in the personal character recognition dictionary. It is checked whether or not it already exists in the recognition dictionary, and if it exists, information is registered so as not to refer to the similar character pattern in the standard character recognition dictionary or the personal character recognition dictionary at the time of character recognition.

In the character recognition method of the invention of claim 9,
A search is performed to determine whether or not information for preventing reference to similar character patterns in the standard character recognition dictionary is registered, and if registered, character recognition is performed without referring to the corresponding character pattern in the character recognition dictionary. I do.

In the character recognition apparatus of the tenth aspect of the invention, the judgment means judges whether or not the registered character pattern is registered in the personal character recognition dictionary. When the search unit determines that the registered character pattern is registered in the personal character recognition dictionary by the determination unit, whether a character pattern similar to the registered character pattern exists in the standard character recognition dictionary. To search. The registration means, when the search means searches for the existence of a similar character pattern in the character recognition dictionary, information for preventing the similar character pattern existing in the standard character recognition dictionary from being referred to during character recognition. To register. The search means searches for a character pattern existing in the standard character recognition dictionary designated by the information registered by the registration means. The character recognition means performs character recognition without referring to the character pattern searched by the searching means.

In the character recognition device of the invention of claim 11, the search means is a registered character registered in the personal character recognition dictionary as a character pattern in the standard character recognition dictionary similar to the registered character pattern. A pattern is searched from the character patterns of the character recognition candidates obtained when the character is recognized using the character pattern in the character recognition dictionary.

In the character recognition device of the twelfth aspect of the present invention, the similarity between the registered character pattern handled by the search means and the character pattern in the standard character recognition dictionary is the same as the registered character pattern in the character recognition dictionary. It is determined based on the evaluation value obtained when the character is recognized by using the character pattern.

In the character recognition apparatus of the thirteenth aspect of the present invention, the registration means registers a marker corresponding to the dictionary number of the similar character pattern in the standard character recognition dictionary searched by the search means.

In the character recognition apparatus of the fourteenth aspect of the present invention, the registration means has a table for storing the markers assigned in correspondence with the dictionary numbers. In the character recognition apparatus of the fifteenth aspect of the present invention, the capacity of the table provided in the registration means is fixed, and the registration means deletes the oldest registered marker each time the marker is newly registered.

In the character recognition apparatus of the sixteenth aspect of the present invention, the marker is registered in the table provided in the registration means by the user, or deleted from the table. 18. The character recognition device according to claim 17, wherein the search means already has a character pattern similar to the registered character pattern not only in the standard character recognition dictionary but also in the personal character recognition dictionary. If a similar character pattern exists in the character recognition dictionary or the personal character recognition dictionary by the searching means, the registration means causes the registration means to recognize the standard character recognition dictionary. In the standard character recognition dictionary specified by the information registered by the registration means, or personal information for registering information not to refer to similar character patterns existing in the personal character recognition dictionary A character pattern existing in the character recognition dictionary is searched.

[0034]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing an embodiment of the character recognition device of the present invention. The character recognition device of this example is a coordinate input device 1 including a transparent tablet 11 and a stylus pen 12 that indicates coordinates on the transparent tablet 11, and a two-dimensional coordinate point sequence obtained from the coordinate input device 1. A display device 2 such as a liquid crystal display for displaying information such as information and character recognition results, and a micro that performs dictionary registration processing or character recognition processing based on the two-dimensional coordinate point sequence information obtained from the coordinate input device 1. It is composed of a control device 3 mainly composed of a processor and an external storage device 4 storing a standard character recognition dictionary 4a, a personal character recognition dictionary 4b and a dictionary non-reference table 4c as shown in FIG. A plasma display or the like can be used as the display device 2 in addition to a liquid crystal display (LCD). In this example, a liquid crystal display is used. Hereinafter, the display device 2 may be referred to as the liquid crystal display 2. The liquid crystal display 2 is laminated and integrated with the transparent tablet 11. That is, the transparent tablet 11 laminated and integrated with the liquid crystal display 2 forms the same coordinate plane of the same size, and the information displayed on the liquid crystal display 2 is visible through the transparent tablet 1. .

Since the coordinate pointing position on the transparent tablet 11 is displayed as the information at the same position on the liquid crystal display 2 by the transparent tablet 11 and the liquid crystal display 2 which are laminated and integrated in this way, for example, with a pen. You can input information as if you were drawing letters / figures on paper.

FIG. 2 is a diagram showing in detail an internal configuration example of the control device 3 shown in FIG. The control device 3 has an initial setting unit 3
1, input unit 32, personal dictionary creation unit 33, character recognition unit 3
4, recognition dictionary operation unit 35, display control unit 36 and storage unit 3
It consists of 7.

The storage unit 37 stores an input data buffer 371 for temporarily storing the two-dimensional coordinate data input from the coordinate input device 1, a character code of a character to be registered, or recognition by character recognition of the input data buffer 371. Character code buffer 3 for temporarily storing the resulting character code
72, a dictionary creation buffer 373 which is a temporary area for temporarily storing data for creating the personal character recognition dictionary 4b, a display data buffer 374 for temporarily storing data to be displayed on the liquid crystal display 2, a system A screen image data buffer 375 storing an image of an initial screen displayed at the time of initialization of the input screen, an input frame of an input screen displayed via the liquid crystal display 2,
The screen area table 376 stores information on coordinate positions of various buttons.

The initial setting section 31 performs initialization processing such as displaying an initial screen of the apparatus of this embodiment and clearing each buffer in the storage section 37, and the input section 32 inputs coordinate information from the coordinate input device 1. The processing is performed. Further, the personal dictionary creating section 33 carries out a process for creating the personal character recognition dictionary 4b from the coordinate information input by the input section 32.

Further, the character recognition unit 34 converts the two-dimensional coordinate data stored in the input data buffer 371 into the standard character recognition dictionary 4a and the personal character recognition dictionary 4b of the external storage device 4, and the dictionary non-reference table 4c. The process of referring and recognizing as a character is performed.

The recognition dictionary operation unit 35 is the character recognition unit 34.
Based on the evaluation value of the character candidate output in step 2, it is checked whether or not a character pattern similar to the character pattern registered in the personal character recognition dictionary 4b exists in the standard character recognition dictionary 4a and the personal character recognition dictionary 4b, and the similarity is obtained. If a character pattern exists, a process of registering information (mark) that the character pattern is not referred to in the subsequent character recognition process in the dictionary non-reference table 4c is performed.

Further, the display control unit 36 displays the data stored in the display data buffer 374 of the storage unit 37 on the liquid crystal display 2 and erases the characters, figures and the like displayed on the liquid crystal display 2. I do. On the liquid crystal display 2, the input screen shown in FIG. 5 for performing character recognition and the registration screen as shown in FIG. 6 for registering in the personal character recognition dictionary are displayed by the display control unit 36.

Hereinafter, how to use the above-mentioned input screen will be described. After inputting characters with the stylus pen 12 in the input frame 41 in the input screen shown in FIG. 5 for character recognition,
By touching the write button 42, the recognition result in the input frame 41 is displayed in the document area 43. Further registration button 4
By touching 4 with the stylus pen 12, as shown in FIG.
Move to the registration screen of.

A character pattern to be registered in the personal character recognition dictionary 4b is written by the stylus pen 12 in the input frame 51 of the registration screen shown in FIG. 6, and a character code corresponding to the registered character pattern is input. Input in area 52. Then, by touching the registration button 53 with the stylus pen 12, the dictionary registration work and the recognition dictionary correction work can be started.

After inputting a character pattern in the input frame 51, if the user wants to input this pattern again, touch the cancel button 54 with the stylus pen 12 to input the character pattern in the input frame 51 and the character code input. Area 52
The data inside will be erased. Also, by touching the end button 55, the screen shifts to the input screen for character recognition shown in FIG.

The external storage device 4 has a standard character recognition dictionary 4a in which standard character patterns are registered and a personal character recognition dictionary 4b in which character patterns of individual users can be registered.
And a dictionary non-reference table 4c. In the standard character recognition dictionary 4a and the personal character recognition dictionary 4b, character patterns referred to when the character recognition unit 34 recognizes characters are registered. The structure of the standard character recognition dictionary 4a is as shown in FIG. 7, and the dictionary number, the character, the character code, the number of strokes, and the start point and the end point of one stroke are expressed in relative coordinates with the start point of the first stroke as a reference. The coordinate information and the like are stored.

The structure of the personal character recognition dictionary 4b is shown in FIG.
The registration number, the character code, the number of strokes, and the coordinate information in which the start point and the end point of one image are represented by relative coordinates with the start point of the first image as a reference are stored. As shown in FIG. 9, the dictionary non-reference table 4c stores a mark indicating whether the character pattern of the dictionary in the standard character recognition dictionary 4a is referred to or not referred to during character recognition.

Next, the overall operation of the apparatus of this embodiment and the operation of registering in the personal character recognition dictionary will be described with reference to the flowcharts of FIGS. 3 and 4. At the beginning of the process, the initial setting unit 31 of the control device 3 clears the buffers 371, 372, 373, 374 of the storage unit 37 in step 301 of FIG. 3 and controls the display of the input screen image data of the screen image data buffer 375. It is displayed on the liquid crystal display 2 via the unit 36 and outputs an input screen as shown in FIG.

Next, when the user uses the stylus pen 12 in step 302 to input a character to be input in the input frame 41 of the input screen as shown in FIG. 5, the input section 32 causes the coordinate input device 1 to input the coordinate point sequence. Enter the information and enter this information in Figure 1.
0 is referred to and the value of the screen area table 376 is referenced to determine whether or not a character is being input in step 303.
Will be done at. Here, FIG. 10 shows a configuration example of the screen area table 376, which stores area numbers representing areas of the input frame and various icons, and the coordinate values of the upper left and lower right of the area.

When the input unit 32 determines in step 303 that the input is to the input frame 41 shown in FIG. 5, step 3
By checking the screen area table 376 as to whether or not the input of the stylus pen 12 is input in a frame different from the frame input so far in 04, it is determined whether or not the input of one character is completed. To judge.

As a result, if it is determined that the character is being input in the same box as the one that was being input (NO), it means that one character is still being input, and the input unit 32 determines in step 305. After the handwriting is displayed on the liquid crystal display 2 by passing the process to the display control unit 36, the coordinate information is stored in the input data buffer 371 in step 306, and then the process returns to step 302. Here, as shown in FIG. 11, the input data buffer 371 stores the two-dimensional coordinate data and a separator (S) indicating the division of one screen. However, the division of one stroke is determined to be the division of one stroke when the stylus pen 12 moves away from the transparent tablet 1.

When it is determined in step 304 that the data has been input into the input box 41 different from that immediately before, it is determined that the input unit 32 has finished inputting one character in the input box immediately before that in step 304. If judged, the character recognition unit 34
Since the character recognition processing is performed on the two-dimensional coordinate data in the input data buffer 371 by, the input unit 32 first passes the processing to the recognition dictionary operation unit 35.

In step 307, the recognition dictionary operation unit 35 refers to the values in the dictionary non-reference table 4c to refer to the registered characters that should not be referred to in the character patterns in the standard character recognition dictionary 4a during character recognition. Check what the pattern is. After that, the character recognition unit 34 performs step 308.
Character recognition processing is performed. The character recognition processing is performed with a registered character pattern other than the unreferenced character pattern checked in the above step in the standard character recognition dictionary 4a having the same number of strokes as the two-dimensional coordinate data stored in the external storage device 4. , Character recognition processing is performed using the character pattern registered in the personal character recognition dictionary 4b.

Now, the character recognition processing described above will be described. First, the two-dimensional coordinate data stored in the input data buffer 371 is converted into the form of relative coordinates based on the starting point of the first stroke stored in the standard character recognition dictionary 4a and the personal character recognition dictionary 4b. . Next, the relative coordinate information and the distances at the coordinate points of the start point and the end point of one stroke of the registered pattern in the standard character recognition dictionary 4a or the personal character recognition dictionary 4b are calculated. Then, the total value of the distances of the coordinate points is obtained, and the value obtained by dividing the total value by the number of strokes is calculated as the evaluation value. Such an evaluation value is obtained for each of the registered character patterns in the dictionaries 4a and 4b having the same number of strokes as the input two-dimensional coordinate data, and the character code having the smallest evaluation value is calculated as a recognition candidate.

Thereafter, the processing shifts to the display control section 36, which erases the handwriting in the input frame 41 shown in FIG. 5 in step 309 and instead obtains it by the character recognition section 34. The recognition result (recognition candidate) is displayed.
The input unit 32 stores the character code of the recognition candidate in the character code buffer 372 in step 310, and then the input data buffer 371 is initialized in the initial setting unit 3 in step 311.
After clearing by 1, return to step 302.

By the way, when the input section 32 determines in step 303 that the data has not been input into the input box 41, the process proceeds to step 321, and the user uses the stylus pen 12 to write the data shown in FIG. It is checked with reference to the screen area table 376 whether the touch button 42 is touched.

As a result, when it is determined that the write button 42 has been touched, the input section 32 once passes the processing to the display control section 36. In step 313, the display control unit 36 displays the character code string of the recognition candidate stored in the character code buffer 372 in the document area 43 shown in FIG.
In step 314, the display in the input frame 41 shown in FIG. 5 is cleared. Then, the processing moves to the input section 32 again, and the input section 32 determines in step 315 that the character code buffer 37
The contents of 2 are cleared and the process returns to step 302.

If it is determined in step 312 that the write button 42 shown in FIG. 5 is not touched, the input section 32 proceeds to step 316 and the registration button 4 shown in FIG.
It is checked with reference to the screen area table 376 whether or not the stylus pen 12 is touching 4. As a result, when it is determined that the registration button 44 is not touched, the input unit 3
In No. 2, it is determined that the pen is placed at an invalid position, and the process returns to step 302 without doing anything. When it is determined that the registration button 44 is touched, the process proceeds to the initial setting unit 31, and the initial setting unit 31 reads the personal dictionary registration screen data from the screen image data buffer 375 in step 317,
This is passed to the display control unit 36, and the personal dictionary registration screen shown in FIG. 5 is displayed on the display device 2 to change the device from the character recognition mode to the personal dictionary registration mode.

When the apparatus shifts to the personal character recognition dictionary registration mode, the user uses the stylus pen 12 to input the character pattern to be registered in the input frame 51 of the registration screen shown in FIG. 6 in step 318. , Input the character code to be registered in the character code input area 52.

Then, the input unit 32 determines in step 319 whether or not the stylus pen 12 is inputting the characters of the registered pattern by referring to the value of the screen area table 376. As a result, when it is determined that the registered character pattern is input in the input frame 51, the input unit 32 causes the step 320 to proceed.
After the handwriting is displayed on the liquid crystal display 2 by the display controller 36 at step 321, the input data buffer 3
After storing the two-dimensional coordinate data in 71, step 318
Return to

If it is determined in step 319 that no data is input in the input box 51, the input unit 32 refers to the screen area table 376 and the user inputs the character code of the registered character into the registered character code. It is determined in step 322 of FIG. 4 whether the area 52 is input. As a result, when it is determined that the character code of the registered character is input, the input unit 32 displays the character code input in step 323 on the liquid crystal display 2 via the display control unit 36, and in step 324. After storing the same character code in the character code buffer 372, the process returns to step 318.

Further, when it is determined in step 322 that the user has not input the character code in the character code input area 52, the input unit 32 refers to the screen area table 376 in step 325 and displays the same as shown in FIG. Cancel button 54
By checking whether or not is touched, it is determined whether or not cancellation processing is being performed.

As a result, when it is determined that the cancel button 54 is touched, the input unit 32 displays the character code in the character code input area 52 and the input frame 51 in the input frame 51 via the display control unit 36 in step 326. Erases the display of handwriting. Then, the contents of the input data buffer 371 and the character code buffer 372 are cleared in step 327,
Return to step 318.

In step 325, the user clicks the cancel button 54.
When it is determined that is not touched, the input unit 32 refers to the screen area table 376 in step 328 to check whether the end button 55 is touched with the stylus pen 12 to recognize the personal character. It is determined whether to end the dictionary registration mode. As a result, the end button 5
When it is determined that 5 is touched, the input unit 32 causes the step 3
In order to transfer the processing to the initial setting unit 31 in 39, the initial setting unit 31 reads the input screen image data from the screen image data buffer 375 in step 329, and displays it on the display device 2 via the display control unit 36. Then, the mode is returned to the character recognition mode, and the process returns to step 302.

On the other hand, if it is determined in step 328 that the user has not touched the end button 55 with the stylus pen 12, the input unit 32 refers to the screen area table 376 in step 329, and the stylus pen 12 registers the button. By checking whether or not 53 is touched, it is determined whether or not registration processing is being performed. Stylus pen 1 at an invalid position when registration is not performed
If it is determined that 2 has been placed, do nothing and step 318
Return to

Here, as for the character code, the user can use the numeric symbol of the character code input frame 56 shown in FIG.
When touched, the input unit 32 inputs the corresponding numerical symbol as a character code and stores it in the character code buffer 372.

When it is determined in step 329 that the registration button 53 is touched, the input section 32 shifts the processing to the personal dictionary creating section 33 to start the dictionary registration processing. In step 330, the personal dictionary creating unit 33 causes the character code buffer 3
By checking the value of 72 and checking whether the character code to be registered is within a predetermined code range, it is determined whether the character code is valid. As a result, when the character code is not valid, The personal dictionary creating unit 33 displays the warning sentence on the liquid crystal display 2 by developing the warning sentence in the display data buffer 374 by the display control unit 36 in step 331, and then returns to step 318.

When it is determined in step 330 that the character code is valid, the personal dictionary creating section 33 determines in step 33.
At step 2, the input data buffer 371 is checked to see if any data is stored therein. If there is no data, the personal dictionary creating unit 33 displays the warning sentence on the liquid crystal display 2 via the display control unit 36 and the display data buffer 374 in step 331, and then returns to step 318.

When it is determined in step 332 that the registration data exists, the personal dictionary creating section 33 determines in step 3
At 33, registration processing in the personal dictionary is performed as follows. That is, in step 333, the personal creation unit 33 first transfers the contents of the personal character recognition dictionary 4b to the dictionary creation buffer 373, and then works on the dictionary creation buffer 373. Character patterns are additionally registered in the personal character recognition dictionary 4b in the form of the data structure shown in FIG. 8, and when the work is completed, the contents of the dictionary creation buffer 373 are transferred to the external storage device 4.

When the work of registering in the personal character recognition dictionary 4b is completed, the processing moves to the recognition dictionary operation unit 35. The recognition dictionary operation unit 35 searches the standard character recognition dictionary 4a for a character pattern similar to the registered character pattern as described below, and gives a non-reference marker to the found character pattern.

First, the recognition dictionary operating section 35 operates in step 33.
At 4, the registered character data stored in the input data buffer 371 is character-recognized by the character recognition unit 34 to obtain a recognition candidate. Further, in step 335, the recognition dictionary operation unit 35 compares the obtained evaluation value of the recognition candidate with a preset threshold value to check whether it is smaller than this threshold value. If the evaluation value is smaller than the threshold value, character recognition is performed. It is judged that the character pattern in the standard character recognition dictionary 4a of the recognized candidates is similar to the registered pattern registered in the personal character recognition dictionary 4b, and the process proceeds to step 336.

The recognition dictionary operation unit 35 modifies the dictionary non-reference table 4c in step 336 as described below. That is, in step 336, the recognition dictionary operation unit 35
Find the dictionary number of the similar standard character recognition dictionary 4a,
A non-reference mark is written in the area corresponding to this number in the dictionary non-reference table 4c as shown in FIG. When the processing of this step 336 is completed, the display of the input frame 41 and the registered character code area 43 of the registration screen shown in FIG. 5 is cleared by the display control unit 36, and further the input data buffer 371 and the character code are set by the initial setting unit 31. After clearing the buffer 372 in step 338, the process returns to step 318. On the other hand, in the process of step 335, when the evaluation value is larger than the threshold value and the value is larger, the recognition dictionary operation unit 35 immediately moves to the process of step 337.

According to this embodiment, the personal character recognition dictionary 4
When a character pattern is registered in b, it is checked whether or not a character pattern similar to this character pattern is registered in the standard character recognition dictionary 4a. As a result, when it is found that a similar character pattern is registered, the standard character is recognized. A mark that makes the similar character pattern in the recognition dictionary 4a non-referenced during character recognition is written in the dictionary non-reference table 4c, and thereafter, the character recognition unit 34 uses only the character pattern registered in the personal character recognition dictionary 4b. Since the handwritten character input from the coordinate input device 1 is recognized, the character pattern registered in the personal character recognition dictionary 4b is not confused with the similar character pattern in the standard character recognition dictionary 4a. By registering the character pattern in the personal character recognition dictionary 4b, the character recognition rate can be surely improved. . Further, the dictionary non-reference table 4c
Since the reference pattern of the character pattern and the non-reference marker are registered, the above effect can be obtained without changing the configurations of the standard character recognition dictionary 4a and the personal character recognition dictionary 4b.

The present invention is not limited to the above embodiment. For example, in the present embodiment, the reference character pattern is distinguished from the reference character pattern only with the standard character recognition dictionary 4a. However, a plurality of recognition dictionaries including the personal character recognition dictionary are registered in each dictionary. By distinguishing the reference and non-reference of the existing character pattern, the effect of this example can be thoroughly achieved.

Further, the information of the dictionary non-reference table 4c provided when the personal character recognition dictionary 4b is created in this embodiment is always updated to non-reference, but this table is stored in the form of a fixed length stack. The old non-referenced marker may be erased each time a new marker is added, and the non-referenced instruction may be canceled for a character pattern that is rarely used. Further, in this embodiment, once a non-reference marker is added to the dictionary non-reference table 4c,
Although the corresponding character pattern remains unreferenced thereafter, the marker of the dictionary non-reference table 4c can be freely deleted by the user, and the reference and non-reference of the character pattern are adjusted according to the user. You may do it.

Further, in the character recognition method of this embodiment, character recognition is performed by matching the distance between the character pattern registered in the dictionary and the input two-dimensional coordinate data. If the evaluation value of the input character can be calculated by, for example, abstracting to, and matching with the shape, the same effect can be obtained by using another character recognition method.

Further, an area for registering a marker indicating reference or non-reference of the character pattern corresponding to the dictionary number or the registration number of the standard character recognition dictionary 4a or the personal character recognition dictionary 4b is provided in each dictionary. May be.

[0077]

As described above, according to the invention of claim 1, at the time of character recognition, only the character pattern registered in the personal character recognition dictionary is referred to, and the character pattern in the standard character recognition dictionary similar to this character pattern is referred to. It is possible not to refer to the character pattern.

According to the invention of claim 2 or 10, a character recognition candidate pattern obtained when the registered character pattern is character-recognized for a character pattern similar to the character pattern registered in the personal character recognition dictionary. Can be defined as

According to the invention of claim 3 or 11, the character pattern similar to the registered character pattern is accurately determined by using the evaluation value obtained when the registered character pattern is recognized. You can

According to the invention of claim 4 or 12, character patterns which are not referred to in the standard character recognition dictionary can be easily distinguished at the time of character recognition by searching the marker.

According to the invention of claim 5 or 13, since the table for storing the markers is separately provided, the above effect can be obtained without changing the structure of the standard character recognition dictionary.
According to the invention of claim 6 or 14, it is not necessary to increase the capacity of the table so much, and it is possible to cancel the non-reference instruction for the character pattern that is rarely used.

According to the seventh or fifteenth aspect of the present invention, the user can adjust the reference / non-reference of the character pattern in the standard character recognition dictionary according to the situation. According to the invention described in claim 8, at the time of character recognition, only a character pattern newly registered in the personal character recognition dictionary is referred to, and a character pattern in the standard character recognition dictionary similar to the newly registered character pattern or It is possible not to refer to the registered character pattern in the personal character recognition dictionary.

According to the ninth or tenth aspect of the invention, the pattern is registered in the personal character recognition dictionary without referring to a similar pattern in the standard character recognition dictionary similar to the character pattern registered in the personal character recognition dictionary. The character recognition can be performed by referring to only the character pattern that has been created, and the character recognition rate can be improved by always validating the registration of the character pattern in the personal character recognition dictionary.

According to the seventeenth aspect of the present invention, the similar pattern in the standard character recognition dictionary similar to the character pattern registered in the personal character recognition dictionary or the already registered character pattern in the personal character recognition dictionary is not referred to. Thus, it is possible to perform character recognition by referring to only the character patterns newly registered in the personal character recognition dictionary, and registering the character pattern in the personal character recognition dictionary is always effective to improve the character recognition efficiency. be able to.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an appearance of an embodiment of a character recognition device of the present invention.

FIG. 2 is a block diagram showing a detailed configuration example of a control device shown in FIG.

FIG. 3 is a flowchart showing a procedure of character recognition and character personal dictionary registration processing of the apparatus shown in FIG.

FIG. 4 is a flowchart showing a procedure of character recognition and character personal dictionary registration processing of the apparatus shown in FIG.

5 is a diagram showing an example of an input screen displayed on the display device shown in FIG.

6 is a diagram showing an example of a registration screen displayed on the display device shown in FIG.

7 is a diagram showing an example of the structure of the standard character recognition dictionary shown in FIG.

FIG. 8 is a diagram showing a structural example of the personal character recognition dictionary shown in FIG.

9 is a diagram showing a structural example of a dictionary non-reference table shown in FIG.

10 is a diagram showing an example of data storage of the screen area table shown in FIG.

11 is a diagram showing an example of a data structure stored in the input data buffer shown in FIG.

[Explanation of symbols]

1 ... Coordinate input device 2 ... Display device (liquid crystal display) 3 ... Control device 4 ... External storage device 4a ... Standard character recognition dictionary 4b ... Personal character recognition dictionary 4c ... Dictionary non-reference table 11 ... Transparent tablet 12 ... Stylus pen 31 ... initial setting section 32 ... input section 33 ... personal dictionary creating section 34 ... character recognition section 35 ... recognition dictionary operating section 36 ... display control section 37 ... storage section 371 ... input data buffer 372 ... character code buffer 373 ... dictionary creation buffer 374 ... Display data buffer 375 ... Screen image data 376 ... Screen area table

Claims (17)

[Claims] 1. A handwritten character is recognized by referring to a character pattern registered in a standard character recognition dictionary or a personal character recognition dictionary, and the handwritten character is registered in the personal character recognition dictionary as a registered character pattern. In the dictionary registration method for registering the registered character pattern in the personal character recognition dictionary in the character recognition device having a function, when the registered character pattern is registered in the personal character recognition dictionary, It is characterized by checking whether a similar character pattern exists in the standard character recognition dictionary, and if there is, registering information for not referring to the similar character pattern in the standard character recognition dictionary at the time of character recognition. How to register the dictionary. 2. The character pattern in the standard character recognition dictionary similar to the registered character pattern is a character recognition obtained when the registered character pattern is character-recognized using the character pattern in the standard character recognition dictionary. 2. A character pattern corresponding to a candidate is searched for in a character pattern.
How to register the listed dictionary. 3. The similarity between the registered character pattern and the character pattern in the standard character recognition dictionary is an evaluation obtained when the registered character pattern is character-recognized using the character pattern in the standard character recognition dictionary. The dictionary registration method according to claim 1, wherein the dictionary registration method is determined based on a value. 4. The information for not referencing the similar character pattern existing in the standard character recognition dictionary at the time of character recognition is provided corresponding to the dictionary number of the similar character pattern in the standard character recognition dictionary. The dictionary registration method according to claim 1, wherein the dictionary registration method is a marker. 5. The dictionary registration method according to claim 4, further comprising a table for storing a marker attached corresponding to the dictionary number. 6. The dictionary registration method according to claim 5, wherein the capacity of the table is fixed, and the oldest registered marker is deleted each time the marker is newly registered. 7. The dictionary registration method according to claim 5, wherein the marker is registered in the table by the user or deleted from the table. 8. When the registered character pattern is registered in the personal character recognition dictionary, a character pattern similar to the registered character pattern is stored not only in the standard character recognition dictionary but also in the standard character recognition dictionary.
It is checked whether it already exists in the personal character recognition dictionary, and if it exists, the registration of information is performed so as not to refer to the similar character pattern in the standard character recognition dictionary or the personal character recognition dictionary at the time of character recognition. The dictionary registration method according to claim 1, wherein the dictionary registration method is performed. 9. The personal character recognition dictionary refers to a character pattern registered in a standard character recognition dictionary or a personal character recognition dictionary, and the handwritten character is registered in the personal character recognition dictionary as a registered character pattern. In the character recognition method in the character recognition device having the function of registering by the dictionary registration method described in No. 1, it is searched whether or not information for preventing reference to similar character patterns in the standard character recognition dictionary is registered. If it is registered, the character recognition is performed without referring to the corresponding character pattern in the character recognition dictionary. 10. A handwritten character is recognized by referring to a character pattern registered in a standard character recognition dictionary or a personal character recognition dictionary, and the handwritten character pattern is registered in the personal character recognition dictionary as a registered character pattern. In the character recognition device having a function for determining whether the registered character pattern is registered in the personal character recognition dictionary, the registered character pattern is registered in the personal character recognition dictionary by the determination unit. When it is determined that a character pattern similar to the registered character pattern exists in the standard character recognition dictionary, a searching unit that searches the standard character recognition dictionary and a similar character in the character recognition dictionary by the searching unit. When it is searched for the existence of the pattern, a similar character pattern existing in the standard character recognition dictionary is recognized at the time of character recognition. Registration means for registering information not to refer to a turn, search means for searching a character pattern existing in the standard character recognition dictionary designated by the information registered by this registration means, and search means by this search means And a character recognition means for performing character recognition without referring to the generated character pattern. 11. The registered character pattern registered in the personal character recognition dictionary is used as a character pattern in the character recognition dictionary as a character pattern in the standard character recognition dictionary that is similar to the registered character pattern. The character recognition device according to claim 10, wherein the character recognition device searches for a character pattern of a character recognition candidate obtained when character recognition is performed using the pattern. 12. The similarity between the registered character pattern handled by the searching means and the character pattern in the standard character recognition dictionary is character recognition of the registered character pattern using the character pattern in the character recognition dictionary. The determination is based on an evaluation value obtained at that time.
The character recognition device according to 0 or 11. 13. The character according to claim 10, wherein the registration unit registers a marker corresponding to a dictionary number of a similar character pattern in the standard character recognition dictionary searched by the search unit. Recognition device. 14. The character recognition device according to claim 13, wherein the registration means includes a table for storing a marker assigned to the dictionary number. 15. The capacity of the table provided in the registration means is fixed, and the registration means deletes the oldest registered marker each time the marker is newly registered. Character recognition device. 16. The character recognition device according to claim 14, wherein the marker is registered in a table provided in the registration means by a user or deleted from the table. 17. The search means searches whether or not a character pattern similar to the registered character pattern already exists in the personal character recognition dictionary as well as in the standard character recognition dictionary. When the searching means searches for a similar character pattern in the character recognition dictionary or the personal character recognition dictionary, the registration means recognizes the character in the standard character recognition dictionary or the personal character recognition at the time of character recognition. Information for not referencing a similar character pattern existing in the dictionary is registered, and the searching means stores in the standard character recognition dictionary or the personal character recognition dictionary specified by the information registered by the registration means. 11. The existing character pattern is searched for.
Character recognition device described.