JP3217084B2 - Handwritten character recognition device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a handwritten character recognition device, and more particularly to an online handwritten character recognition device for recognizing character information input by a pen on a tablet based on a time-series change in pen position coordinates. is there.

[0002]

2. Description of the Related Art In a conventional on-line handwritten character recognition apparatus, for example, when a character "" is input by handwriting, whether the input character is a character consisting of "heavy" and "", or Is difficult to determine. That is, since it is difficult to determine the delimitation of character input, one character intended in input as a result of the recognition is recognized and displayed as two characters, or is determined as one character although the intention to input is two characters. May be done.

As a means for solving such a problem, there has been proposed a method of setting a character frame in which a character is to be input and writing one character in the character frame.

As another solution, for a character such as hiragana or katakana which has a small number of strokes, the recognition result of the inputted character can be obtained after a certain period of time has passed after the character has been written. There has also been proposed a method of determining the character delimiter by outputting the output, checking the recognition result, and then handwriting the next input character.

[0005]

The method of displaying and inputting character frames as described above departs from the feature of handwriting input, that is, the feeling of inputting by writing naturally on paper. On the other hand, in the method of giving a recognition instruction (including time-up) for each input of one character, the input speed is reduced, and the sense of natural input is also impaired.

Therefore, in the handwritten character recognition device, it is desirable to write continuously without a character frame and to sequentially or collectively recognize the characteristics in order to take advantage of its features. However, in such a case, if erroneous recognition of input of a plurality of characters occurs, for example, in the case where batch input is performed, the input characters may be unknown. Further, as described above, when two characters intended to be input are recognized as one character or one character intended to be input is recognized as two characters, it becomes difficult to correct the character.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and allows continuous writing without a character frame.
It is another object of the present invention to provide a handwritten character recognition device capable of easily coping with a recognition error when the recognition error occurs.

[0008]

According to a first aspect of the present invention, there is provided a handwritten character recognition apparatus for recognizing handwriting information input by a pen on a tablet based on a time-series change in pen position coordinates. A character recognition device, comprising: character information storage means for storing handwriting information input by contacting and non-contact of a pen with a tablet; and a brush stored in the character information storage means.
Analysis means for analyzing the trace information and outputting preliminary information for recognizing the input character; and a character for recognizing handwriting information stored in the character information storage means as an input character based on the preliminary information and predetermined character data. Recognition means, recognition result display means for displaying the recognized input character, and designation of any of the displayed input characters, the corresponding input character is stored in the preliminary information and character information storage means. Character information display means for displaying the handwriting information, correction means for correcting the information displayed by the character information display means, and character recognition means and correction means based on the information corrected by the correction means. Character re-recognition means for re-recognizing the input character by the character recognition means, wherein the preliminary information includes information representing a character delimiter, and the correction means comprises:
Including means for modifying the information representing the delimiters of the displayed characters. The handwritten character recognition apparatus according to the second aspect of the present invention has a correction means in addition to the configuration of the first aspect of the invention.
Enter a separator for the displayed characters and
Remove one or both of the lines
Including the now means. According to a third aspect of the present invention, in addition to the configuration of the first or second aspect , the character information display means includes a plurality of input characters displayed.
By specifying the character corresponding to the specified character.
And handwriting information stored in the character information storage means.
Means for displaying
Means for modifying the preliminary information corresponding to the input character is included. In the handwritten character recognition device according to the fourth aspect of the present invention, in addition to the configuration of the first or second aspect of the invention, the character information display means surrounds a plurality of displayed input characters.
Te, comprising means for displaying the handwriting information stored in the pre-information and character information storing means corresponding to a plurality of characters enclosed, correction means includes a plurality of input characters enclosed in separator
Including means for deleting .

[0009]

According to the first aspect of the present invention, the character information storage means stores handwriting information input by touching or non-contacting the pen with the tablet. The analysis unit analyzes the handwriting information stored in the character information storage unit and outputs preliminary information for recognizing the handwriting information as an input character. Character recognition means,
The handwriting information stored in the character information storage unit is recognized as an input character based on the preliminary information and the predetermined character data.
The recognition result display means displays the recognized input character.
The character information display means displays preliminary information corresponding to the specified character and handwriting information stored in the character information storage means by designating any of the displayed input characters. The correction unit corrects the information displayed by the character information display unit. The character re-recognition unit recognizes the input character again by the character recognition unit based on the information corrected by the correction unit. Thus, the analyzing means detects, for example, that a switch on the writing pen has been pressed, determines that one unit of input has been completed, and outputs preliminary information. The correction means can correct the preliminary information indicating the character delimiter , or correct the trajectory of the character input by the pen. The re-recognition unit recognizes a correct input character based on the corrected information. As a result, it is possible to provide a handwritten character recognition device that can be continuously written without a character frame and can easily cope with an error in recognition when there is an error in recognition. According to the invention described in claim 2,
The corrective action is to input the separator of the displayed characters.
And / or remove character separators
Do both . As a result, if there is an error in the division of the character that is the preliminary information, the division is newly input.
Or delete the separator . As a result, writing sequentially with no character frame, and when the character delimiter of the recognized input character as an error, the ward
By removing the cut, a handwritten character recognition device that can easily deal with recognition errors can be provided. According to the third aspect of the invention, the character information display means displays the displayed input information.
The specified character by specifying more than one of the force characters
And the preliminary information corresponding to the
Display handwriting information. Correction means specified
Correct the preliminary information corresponding to the input character of . This allows you to specify multiple recognized input characters and
Preliminary information corresponding to the
Based on the corrected information, the input characters can be re-recognized . As a result, many corrections are made to successive parts of the string.
Even if necessary, a handwritten character recognition device capable of easily coping with a recognition error can be provided. According to the fourth aspect of the present invention, the character information display means surrounds a plurality of displayed input characters, so that the preliminary information corresponding to the plurality of enclosed characters and the handwriting stored in the character information storage means. And information. Correction means is used for multiple input characters
Remove the separator of . Thus, a plurality of the recognized input character easily specify, 1 the specified character sentences
You can modify the character delimiter as
Thus , the input character can be recognized again. As a result, it is possible to provide a handwritten character recognition device that can easily cope with a recognition error even when a large number of corrections are necessary for a continuous portion of a character string.

[0010]

FIG. 1 is a block diagram showing the configuration of a handwritten character recognition apparatus according to one embodiment of the present invention.

Referring to the drawings, display-integrated tablet 1
Is a coordinate input device on the panel, and outputs pen-up, pen-down, pen coordinates and the like by a writing pen to the CPU 2 as input data. In addition, it also functions as a display unit that displays input text data, handwriting data, recognition results, and the like under the control of the CPU 2.

The handwritten character recognition unit 3 performs character recognition based on predetermined character data based on character information such as pen coordinates output by the CPU 2. The recognition result and handwriting data corresponding to the recognition result are output to the CPU 2.

The recognition result storage memory 4 is a memory for sequentially storing recognition results obtained by the handwritten character recognition unit 3, and its operation is controlled by the CPU 2.

The handwriting information storage memory 5 is a memory for storing handwriting information for each recognized character unit, and its operation is controlled by the CPU 2.

The CPU 6 is a memory for storing a program for controlling the CPU 2, input text data, display data, and the like. That is, the character information sequentially recognized is stored in the CPU memory 6.

FIG. 2 is a flowchart showing the contents of the control operation performed by the CPU 2 of FIG. 1, and FIGS. 3 to 9 show specific examples in the case where the data is actually input in accordance with the flowchart of FIG. is there. Hereinafter, the operation of the CPU 2 will be described with reference to FIGS.
This will be described with reference to the flowchart of FIG.

As a method of recognizing handwritten characters, there are a pattern matching method, a basic stroke method, and the like, and any general method can be applied to the present invention. However, as described above, the target is a recognition method that does not require a character frame.

Here, a description will be given of a case where a sentence containing kanji kana, which is "a circumscribed frame of online characters ..." is input.

As shown in FIG. 3, when handwriting is input into the display-integrated tablet 1 with a writing pen such as "outside of online characters", coordinate data is obtained by contact or non-contact of the pen. Is read (step S
1). Next, in step S2, it is determined whether one unit of the input to be converted has been completed. Here, it is determined that one unit of input has been completed by pressing a switch (not shown) attached to the writing pen, and character recognition is started based on the input character information (step S3).
Specifically, the CPU 2 uses information input from the tablet, information of contact and non-contact of the writing pen, etc.
The handwriting input to the display-integrated tablet 1 is displayed, and the information is output to the handwriting recognition unit 3. When the switch of the writing pen is pressed, the handwriting recognition unit 3 is instructed that one unit of the input is completed.

The handwritten character recognizing unit 3 determines character delimiters under the handwritten information sent from the CPU 2 and recognizes characters based on predetermined character data stored.
Next, the handwritten character recognition unit 3 outputs the recognition result and the corresponding handwriting information to the CPU 2. In response, the CPU 2 stores the recognition result in the recognition result storage memory 4 and stores the handwriting information in the handwriting information storage memory 5 in association with the recognition result. As shown in FIG. 4, the recognition results are sequentially displayed at the position of the cursor on the display-integrated tablet 1 (step S4). Here, character delimiters are reserved for character recognition.
It is an example of equipment information.

Next, in step S5, it is determined whether or not the displayed recognition result is correct. In this embodiment, two errors occur in the recognized character. As shown in FIG. 5, among the displayed recognized characters, a portion of the character that is considered to have an error is circled with a writing pen (hereinafter, referred to as “designate”). (Step S7). When a part of the displayed character is designated in this way, the CPU 2 extracts handwriting information corresponding to the recognition result of the designated character from the storage memory 5, and reads out the handwriting information from FIG.
The information is displayed in the vicinity of the designated character together with the delimiter information and the command switch for correction as shown in (8) (step S8). In this example, the katakana “in” as the input two characters is determined to be one character input,
It is recognized as “jin”. Therefore, the information indicating the delimiter of the input character is not displayed in the handwriting information displayed as shown in FIG.

In this case, since the input of the break is necessary (YES in step S9), the input of the break is performed with a writing pen (step S10). Specifically, when a desired position in the lower part of the handwriting information is touched with a writing pen, a mark 示 す indicating a break is displayed at that position as shown in FIG. A broken line is displayed as delimiter information in the display area of the handwriting information. By touching the mark of the delimiter again with the writing pen, the input of the delimiter is canceled and the state before the input is restored.

After confirming that the delimiter information has been input at a desired position, and touching the "recognition" portion displayed on the right side with a writing pen, the CP is displayed based on the delimiter information.
U2 sends handwriting information to the handwriting recognition unit 3 as input information in units of two characters. The handwriting recognition unit 3 performs character recognition again based on the corrected writing information, and outputs the result to the CPU 2 (step S11). Next, CP
U2 redisplays the recognition result newly output from the handwritten character recognition unit 3 on the display-integrated tablet 1 (step S12). In this case, the "online" input is correctly corrected and displayed.

Next, the flow returns to step S5. In this example, however, since there is still an error in the recognized character, the flow does not proceed to step S6, but proceeds to step S27. In this example, the input character to be recognized as “outside” is recognized as “tatto”. In response to this recognition error, the character "Tato" is similarly circled with a writing pen to specify an error character (step S7). When an erroneous character is specified, handwriting information corresponding to the specified recognition character is displayed as described above (step S8). In this case, as shown in FIG. 7, since the input character is determined as two characters in the handwriting information, the delimiter information is input at the position indicated by the broken line. Therefore, the flow proceeds from step S9 to step S13, and it is determined whether or not the break information needs to be released. In this case, since the break needs to be released, in step S14, the break is released by touching the mark 示 す indicating the break shown in FIG. 7 with a writing pen (step S14). With the delimiter information released as shown in FIG. 8, by touching the "recognition" portion on the right side with a writing pen, the CP
The characters input from U2 to the handwritten character recognition unit 3 are output as data in units of one character. Then, the handwritten character recognition unit 3 recognizes the character based on the corrected handwriting information (step S15), and displays the result on the display-integrated tablet 1, as shown in FIG. By performing the delimiter input and the delimiter in this manner, as shown in FIG. 9, intended input information is correctly recognized and displayed on the tablet, and the input information is transmitted to the CPU.
Stored in the memory 6. As shown in FIG. 9, when all the recognition results are correct, it is determined in step S6 whether or not the input of characters has been completed. If characters are still input, the flow returns to step S1, and the above-described operation is repeated.

The above is an embodiment characterized by the present invention. Other methods of correcting input characters will be described below.

For example, as shown in FIG. 5, when "correction" on the right side of the handwriting information is touched with a writing pen, the display area of the handwriting information is erased, a newly input character is recognized, and the designated character is recognized. Is replaced there. Also "Erase"
Touching a part with a writing pen erases the specified character. Furthermore, by touching the "cancel" portion with the writing pen, the character at the time of correction can be rewritten, and by touching the "interrupt" portion with the writing pen, the operation can be performed when an incorrect designation is made. Can be interrupted.

As described above, according to the embodiment of the present invention,
When some characters of the recognized result are specified, handwriting information of the corresponding character is displayed, and handwriting information corresponding to the erroneously recognized result can be confirmed. Therefore,
It is possible to easily determine which input character was erroneously recognized, and easily correct an error in the recognition result by correctly inputting the erroneously recognized character again.

Also, the input character delimiter information is displayed together. For example, if a character intended to be input as two characters is recognized as one character, the result of the recognition as one character is designated. By doing so, the corresponding handwriting information is displayed. Then, by inputting character delimiter information into the handwriting information, the character is recognized as two characters as intended. In this manner, the handwriting information can be displayed and the delimiter information can be changed, so that there is no need to input again even if there is an erroneous recognition, and efficient input becomes possible.

In the above embodiment, the instruction to start recognition is made after inputting a plurality of characters. However, each time a character is input with a writing pen, recognition is performed while judging character delimiters, and the recognition results are sequentially displayed. No problem.

[0030]

As described above, according to the present invention, when the displayed input character is designated, the corresponding character information is displayed and can be corrected. Therefore, if there is an error in the recognition of the input character, the correction is easy. Can be.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a specific configuration of a handwritten character recognition device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing specific contents of a control operation performed by CPU 2 of FIG. 1;

FIG. 3 is a diagram showing a specific input state to a tablet according to an embodiment of the present invention.

FIG. 4 is a diagram showing a state in which character information recognized corresponding to the input of FIG. 3 is displayed on a tablet.

FIG. 5 is a diagram showing a state in which an erroneous character is designated among the character information recognized in FIG. 4;

FIG. 6 is a diagram showing a state in which delimiter information is designated in the state of FIG. 5;

FIG. 7 is a diagram in which, of the recognized characters displayed on the tablet after the processing in FIG. 6, yet another portion having an incorrect recognition is designated.

FIG. 8 is a diagram showing a state in which delimiter information has been released in the state of FIG. 7;

9 is a diagram illustrating a state in which all character information that has been erroneously recognized after the processing in FIG. 8 is corrected, and correct input characters are displayed on the tablet again.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Display integrated tablet 2 CPU 3 Handwriting character recognition part 4 Recognition result storage memory 5 Handwriting information storage memory 6 CPU memory

Claims (4)

(57) [Claims] 1. A handwritten character recognition device for recognizing handwriting information input by a pen on a tablet based on a time-series change in pen position coordinates, wherein the pen contacts the tablet. a character information storage means for storing handwriting information input by the non-contact, analyzing means for outputting the preliminary information for recognizing and analyzing handwriting information stored in the character information storage means as the input character, the Character recognition means for recognizing handwriting information stored in character information storage means as input characters based on the preliminary information and predetermined character data; recognition result display means for displaying the recognized input characters; by specifying one of the input character, corresponding to the specified character, the character information for displaying the handwriting information stored in the preliminary information and the character information storage unit Indicating means; correcting means for correcting information displayed by the character information displaying means; connected to the character recognizing means and the correcting means; and based on the information corrected by the correcting means, the character recognizing means. and a re-recognizing the character re-recognition means the input character by the preliminary information includes information representing a delimiter character, said modifying means modifying the <br/> information indicating a delimiter of the displayed the character A handwritten character recognition device, comprising: 2. The correction means includes means for performing one or both of inputting a displayed character delimiter and deleting the character delimiter.
The handwritten character recognition device according to claim 1 . 3. The character information display means, by designating a plurality of the displayed input characters, displays the preliminary information corresponding to the designated character and the handwriting information stored in the character information storage means. 3. A means for displaying a plurality of input characters, wherein the correction means includes means for correcting preliminary information corresponding to the plurality of designated input characters.
The handwritten character recognition device described in 1. 4. The character information display means surrounds a plurality of the displayed input characters, so that the preliminary information corresponding to the plurality of enclosed characters and the handwriting information stored in the character information storage means. 3. The handwritten character recognition device according to claim 1, further comprising: means for displaying a character string; and said correction means including means for deleting a boundary between the plurality of enclosed input characters. 4.