JPH06337957A - Handwritten character input device and correction code recognizing method - Google Patents

Abstract

PURPOSE:To provide a handwritten character input device and a correction code recognizing method capable of surely recognizing a handwritten input correction code while easily distinguishing it from another character or code without using a specific means. CONSTITUTION:When the coordinate value string of a handwritten two-dimensional pattern is inputted from a coordinate input part 1, a control part 2 judges whether or not the string is the pattern of one stroke, and in the case of the pattern of one stroke, judges whether or not the pattern is the character pattern of another numeral or the like. Only when the pattern is not the character pattern of another numeral or the like, the two-dimensional pattern is judged as a correction code and editing operation accessed by the correction code is executed. Consequently, recognition algorithm can be simplified without using a specific means for recognizing the correction code and the recognition ratio of the correction code can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a handwritten character input device for recognizing a coordinate sequence of a two-dimensional pattern input by handwriting and recognizing and inputting various characters and a correction symbol for calling an editing function, and more particularly, the above correction. Regarding the method of recognizing symbols.

[0002]

2. Description of the Related Art When a handwritten character or figure is drawn on a tablet using a stylus pen as an input means of a data processing device replacing a keyboard, the coordinate value of the handwriting is input from the tablet in real time. There is an online handwritten character recognition technology that detects stroke information from a value and recognizes the character or figure drawn on the tablet. By recognizing the handwritten correction symbol by this technique, it is possible to call the editing function for editing the already input document or the like.
However, the conventional correction symbol consists of two strokes.
Many of them are made up of dimensional patterns, and in determining in real time the boundaries of multiple strokes that make up such a correction symbol, the stroke input time is measured and the input frame for the boundaries is set. It is necessary to determine the difference between the correction symbol and other characters or the type of the correction symbol by using special means such as At the same time, there is a drawback that the correction symbol is erroneously recognized.

[0003]

As described above, in the conventional handwritten character input device, when the correction symbol for calling the editing function of the input document is input by handwriting, the conventional correction symbol is composed of a plurality of strokes. Since many objects are composed of two-dimensional patterns, in order to distinguish in real time each segment of a plurality of strokes that make up a correction symbol,
Using a special means such as measuring the stroke input time, it is possible to distinguish the difference between the correction symbol and other characters,
Alternatively, there is a drawback that the type of the correction symbol must be discriminated, an algorithm for recognizing the correction symbol becomes complicated, and an erroneous recognition of the correction symbol occurs.

Therefore, the present invention eliminates the above-mentioned drawbacks and allows correction symbols input by handwriting to be used without using special means.
It is an object of the present invention to provide a handwritten character input device and a corrected symbol recognition method that can be easily distinguished from other characters and symbols for reliable recognition.

[0005]

SUMMARY OF THE INVENTION The present invention recognizes a two-dimensional pattern input by handwriting, inputs characters and symbols, and when a correction symbol is input by handwriting, recognizes the correction symbol and recognizes the correction symbol. In the handwritten character input device that performs the editing operation that means, the two-dimensional pattern input by handwriting is 1
A first determining unit that determines whether or not the pattern is a stroke, and if the first determining unit determines that the pattern is a one-stroke pattern, the one-dimensional two-dimensional pattern is compared with another one-stroke pattern. Second determining means for determining whether or not the character or symbol pattern is present, and if the second determining means determines that the one-stroke two-dimensional pattern is not another one-stroke character or symbol pattern, It has a configuration including a recognition means for recognizing the one-stroke two-dimensional pattern as the correction symbol.

[0006]

In the handwritten character input device of the present invention, the first determination means determines whether or not the two-dimensional pattern input by handwriting is a one-stroke pattern. When the first determining means determines that the one-stroke pattern is the one-stroke pattern, the second determining means determines whether the one-stroke two-dimensional pattern is another one-stroke character or symbol pattern. . The recognizing means recognizes the one-stroke two-dimensional pattern as the correction symbol when the second determining means determines that the one-stroke two-dimensional pattern is not another one-stroke character or symbol pattern. As a result, the correction symbol input by handwriting can be easily and surely recognized without using any special means.

[0007]

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 block diagram showing an embodiment of a handwritten character input device of the present invention. 1 is input by handwriting 2
A coordinate input unit such as a tablet for sequentially inputting position coordinates indicating strokes of a three-dimensional pattern, a control unit 2 for recognizing characters and correction symbols from a sequence of position coordinates handwritten and input from the coordinate input unit 1, Reference numeral 3 is a display unit for displaying character information, correction symbols, etc. recognized by the control unit 2.

FIG. 2 is a block diagram showing a detailed example of the control unit 2 described above. The control unit 2 includes an input control unit 2a, a recognition processing unit 2b, a display control unit 2c, a stroke data buffer 2d, an output buffer 2e, and a recognition dictionary 2f.

FIG. 3 is an exploded perspective view showing an example of the appearance of the apparatus shown in FIG. The coordinate input unit 1 is composed of a transparent tablet or the like, and is laminated and integrated on the screen of a display unit 3 formed of a liquid crystal display or the like to form an input display unit. By using such an input display unit, the information displayed on the display unit 3 can be viewed through the coordinate input unit 1 composed of a transparent tablet. In addition, such an input display unit is the control unit 2
It is attached integrally on top of. Reference numeral 4 denotes a stylus pen. When a character or the like is handwritten on the transparent tablet 1 using the pen 4, the handwriting position coordinate sequence is input to the control unit 2 and recognized, and is input by the stylus pen 4 of the display unit 3. The recognition result is displayed at the position where

Next, the operation of this embodiment will be described. The position coordinates of the two-dimensional handwritten pattern input on the coordinate input unit 1 by the stylus pen 4 and the on / off information of the switch at the tip of the pen 4 are input from the coordinate input unit 1 to the control unit 2 and shown in FIG. Such processing is performed. First, when handwriting is input on the coordinate input unit 1 by the stylus pen 4, the input control unit 2a determines in step 401 whether the switch of the stylus pen tip is turned on, and the stylus pen 4 is turned on. If so, step 40
2, the coordinate value data input from the coordinate input unit 1 is regarded as data within one stroke, and the coordinate value data detected at this time is stored in the stroke data buffer 2d.
To store. Then, the display control unit 2c displays the handwriting pattern of the pen 4 on the display unit 3 in step 403 based on the coordinate value data stored in the stroke data buffer 2d.

On the other hand, when the stylus pen 4 is determined to be off in step 401, the recognition processing section 2d considers that one stroke has ended and moves to the next stroke, and the recognition processing section 2d divides it into the stroke data buffer 2d. The code is stored at step 404. Next, in step 405,
If the start position of the stroke is within a certain value (distance) from the previously stored position data of the stroke, it is determined that this stroke is also a part of the stroke forming the same character. Then, step 401
Then, the operation of storing the coordinate value designated by the pen 4 in the stroke data buffer 2d as the coordinate value data of the stroke following the previous stroke is repeated.

Next, in step 405, when the stroke intervals are more than a certain value, the recognition processing section 2b determines that the stroke is the start stroke of a new character,
The coordinate value string data before that is regarded as the stroke data for one character, and the process proceeds to step 406. Step 406
Then, the recognition processing unit 2b uses the stroke data buffer 2d.
The coordinate value string for one character stored in is recognized by the method described below.

That is, the recognition processing unit 2b uses the recognition dictionary 2 shown in FIG.
The coordinate value data in the stroke data buffer 2d is analyzed using the data in f as shown in FIG.
Examine the delimiter data to determine the number of strokes. Next, for each stroke, the direction value between two points is obtained from each coordinate value string data that constitutes the stroke, and direction string data is created. Further, the direction string data is searched, and if the same direction value continues, it is represented by one direction value, and the direction value string data is compressed.

Here, the direction value is quantized and given to eight directions (direction values) as shown in FIG. 7, for example.
According to this quantization, for example, the number "3" is converted into the direction value string "252357" as shown in FIG.
Such processing is executed for each stroke data. Next, the recognition processing unit 2b collates the information of the obtained direction value string with the recognition dictionary 2f to recognize the input character. As shown in FIG. 5, the recognition dictionary 2f used for this recognition process expresses the characteristics of strokes forming a character to be recognized as a direction value string, and this direction value string is represented for each number of strokes forming each character. It is classified into and is associated with each character code.

The recognition processing unit 2b calls the direction string information D2 and the character code D3 corresponding to the stroke number D1 shown in FIG. 5 from the recognition dictionary 2f, and recognizes these pieces of information.
The data is stored in a primary buffer (not shown) provided in b. After that, the recognition processing unit 2b compares the direction value sequence data created as described above with the direction sequence information of the one-time buffer to check whether there is a match, and if they match, The character code is extracted and written in the output buffer 2e, and the character is recognized. Even if there is no exact match, if there is a match within the allowable range, that character code is extracted. The display control unit 2c displays the character pattern corresponding to the character code stored in the output buffer 2e on the display unit 3. Since the recognition processing unit 2b performs the recognition process by collating the direction value string information of the stroke data with the recognition dictionary 2f as described above, FIG.
As shown in (a) to (e), the dictionary storing the editing function instruction called by the correction symbol is prepared in the recognition dictionary 2f. However, the correction symbols in this example are all represented by one stroke symbol.

Next, at step 407, it is judged whether or not the handwritten two-dimensional pattern recognized as described above has one stroke. If it is not one stroke, the process is terminated and 1
If it is a stroke, the process proceeds to step 408, and it is determined by the recognition dictionary 2f whether or not the one-stroke pattern is a correction symbol. If it is not, the process ends, and if it is a correction symbol, the process proceeds to step 409. . Step 4
After recognizing what the correction symbol input indicates in 09, the editing process instructed by the correction symbol is performed in step 410, and the process is terminated.

FIG. 8 is a diagram showing an example of a correction symbol used in this example and an example of an editing function called by the correction symbol. The arrow in (a) means delete a. For example, if you draw the arrow (a) in the "Tokyo" part of "Tachikawa City, Tokyo", you will call the edit function that deletes this "Tokyo" part. And so on. Further, the correction symbols (a) to (e) are all one-stroke two-dimensional patterns. The recognition dictionary 2f stores editing function instructions (a) to (e) called by the correction symbols (a) to (e) as described above.

According to this embodiment, since the correction symbols are all formed by a one-stroke two-dimensional pattern, it is first determined whether or not the two-dimensional pattern input from the coordinate input section 1 is one stroke. If it is 1 stroke, it is determined whether or not this is a character composed of 1 stroke such as a number, and if it is not, it is determined as a correction symbol and this correction symbol is called from the recognition dictionary 2f. Since the editing operation according to this instruction can be performed after the instruction is taken out, the algorithm for discriminating the correction symbol can be simplified and the discrimination accuracy can be improved compared to the conventional method, and the correction symbol can be recognized. The rate can be improved, and quick and reliable editing can be performed. It should be noted that the present invention can be similarly applied to a document creating apparatus or the like that creates a document by recognizing and inputting such a handwritten character and then performing Kana-Kanji conversion on the input to obtain the same effect. .

[0019]

As described above, according to the handwritten character input device and the correction symbol recognition method of the present invention, the handwritten input correction symbol can be easily distinguished from other characters and symbols without using any special means. Can be surely recognized.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a handwritten character input device of the present invention.

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

FIG. 3 is a perspective view showing a schematic configuration example of an input unit and a display unit shown in FIG.

FIG. 4 is a flowchart showing a process when the control unit shown in FIG. 1 recognizes a correction symbol.

5 is a diagram showing an example of contents of the recognition dictionary shown in FIG.

FIG. 6 is a diagram showing an example of a direction value sequence obtained by the recognition processing unit shown in FIG.

7 is a diagram showing an example of quantization of direction values used when compressing direction value data in the recognition processing unit shown in FIG.

FIG. 8 is a view showing an example of a correction symbol used in the apparatus shown in FIG. 1 and an example of an editing function called by the correction symbol.

[Explanation of symbols]

 1 ... Coordinate input unit 2 ... Control unit 3 ... Display unit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshiya Goto 1381 Shinmachi, Ome-shi, Tokyo Within Toshiba Computer Engineering Co., Ltd. (72) Inventor Koji Shinohara 1381 Shinmachi, Ome-shi, Tokyo Toshiba Computer Within Ta Engineering Co., Ltd. (72) Hirofumi Tsujimoto 1381 Shinmachi, Ome-shi, Tokyo Inside Toshiba Computer Engineering Co., Ltd. (72) Yoshiteru Tanaka 1381 Shinmachi, Ome-shi, Tokyo Toshiba Computer Engineering (72) Inventor Kenichi Koga 1381 Shinmachi, Ome-shi, Tokyo 1 Toshiba Computer Engineering Co., Ltd. (72) Inventor Yuichi Inoue 1381 Shinmachi, Ome, Tokyo Toshiba Computer Engineering Co., Ltd. Within

Claims (2)

[Claims] 1. A two-dimensional pattern input by handwriting is recognized, characters and symbols are input, and when a correction symbol is input by handwriting, this is recognized and an editing operation indicated by the correction symbol is performed. In the handwritten character input device, first determining means for determining whether or not the two-dimensional pattern input by handwriting is a one-stroke pattern, and when the first determining means determines that it is a one-stroke pattern. Second determining means for determining whether or not the one-stroke two-dimensional pattern is another one-stroke character or symbol pattern, and the second one-stroke two-dimensional pattern is determined by the second determining means. If it is judged that it is not a one-stroke character or symbol pattern, this 1
A handwritten character input device comprising: a recognition unit that recognizes a two-dimensional pattern of strokes as the correction symbol. 2. A two-dimensional pattern input by handwriting is recognized, characters and symbols are input, and when a correction symbol is input by handwriting, this is recognized and an editing operation indicated by the correction symbol is performed. In the correction symbol recognition method in the handwritten character input device, all the correction symbols are defined by one-stroke two-dimensional patterns, and the two-dimensional pattern input by handwriting is one stroke and the one-stroke two-dimensional pattern is other. In the case where the one-stroke character or symbol pattern is not recognized, the two-dimensional pattern is recognized as the modified symbol.