JP3167800B2 - Online character input device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an online character input device for recognizing a character input by handwriting via a coordinate input device such as a tablet.

[0002]

2. Description of the Related Art In recent years, an online character input device for recognizing a character input by handwriting through a coordinate input device such as a tablet for preparing a document or the like has been receiving attention.
In this type of online character input device, when a plurality of characters, that is, a character string are successively written by hand, data is cut out one character at a time from the written data of the character string, and the data is recognized to recognize the character string. Get character code string.

Conventionally, the main method has been to write characters one by one in a character entry box prepared in advance on a screen and cut out data for each character entered in the character entry box. However, recently, “Online Character Recognition of Borderless Written Character Strings Using Candidate Lattice Method” (Transactions of IEICE. Vo.
l.J68-D No.4, p765, 1985), there has been reported a method of automatically extracting and recognizing characters from a character string written on one line.

In such a character string recognition method, when it is desired to insert a blank code into a character string, a pattern of a symbol corresponding to the blank code is registered in advance, and the symbol is input by writing. Was.

[0005]

However, providing a space in a character string means that nothing is originally written there. From such a point, the above-described character string recognition method that requires writing of a symbol to insert a blank code has a problem of giving a writer an unnaturalness.

An object of the present invention is to solve such a problem, and it is an object of the present invention to provide an online character input device capable of inputting a character string mixed with blanks with a natural feeling.

[0007]

In order to achieve the above object, an on-line character input device according to the present invention has a coordinate input device for inputting coordinate values designated by using a pen-like pointing device, and the coordinate input device. Writing data input means for inputting a sequence of coordinate values input as writing data of a character string mixed with blanks, and a handwriting input from the writing data input means.
The maximum / minimum value for determining the maximum and minimum values of the data in the y-axis direction
The judgment is made by the small value judgment means and the maximum / minimum value judgment means.
The range between the maximum and minimum values in the specified y-axis direction
projection value calculation means for obtaining a projection value on an x coordinate;
Based on the projected values on each x-coordinate calculated by the value calculation means.
And blank length calculating means for calculating an x-axis length of the blank portion present in Hazuki said writing data, the length of the x-axis direction of the blank portion obtained by at least the space length calculation means
Writing data determined by the maximum / minimum value determination means
Based on the difference between the maximum value and the minimum value of the
Determining means for determining the number of blank portions into which a blank code is to be inserted and the number of blank codes to be embedded; recognition means for performing character string recognition on handwritten data excluding the blank portion into which the blank code is to be inserted; Blank code insertion means for inserting the number of blank codes obtained by the determination means into a character code string as a recognition result and outputting the blank code as a final recognition result.

[0008]

According to the present invention, the maximum value of the writing data in the y-axis direction is
A projection value on each x coordinate in a range from the minimum value is obtained.
Exists in the written data based on the projected value on each x coordinate
Obtain the length of the blank part in the x-axis direction, and calculate the
x-axis length and maximum and minimum of writing data in y-axis direction
Based on the difference with the value,
Judgment, have rows string recognition for handwritten data excluding the blank portions to be inserted blank code, insert a blank code in the character code string which is the recognition result, and outputs this as the final recognition result.

Therefore, according to the present invention, a blank portion can be automatically embedded in a portion of a character string that is to be blanked by directly opening and writing the blank portion. It is possible to perform handwriting input of mixed character strings.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram for explaining the configuration of an online character input device according to one embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a display-integrated tablet. The display-integrated tablet 1 is formed by superposing a transparent tablet as a coordinate input device on a display device such as a liquid crystal display panel, for example, at a position designated by a user using a stylus pen as a pen-like pointing device. (Coordinates) are detected and input to the processing device as input data. Reference numerals 2, 3, 4, and 5 denote an end processing unit 2 that executes a specific process based on input data from the display-integrated tablet 1, a character string recognition processing unit 3 including spaces, a character string insertion positioning unit 4, and a handwriting input. Processing unit 5. Reference numeral 6 denotes an internal document data storage unit for storing document data.

Next, the overall operation flow of the apparatus of this embodiment will be described with reference to FIGS.

FIG. 2 shows a screen displayed on the display-integrated tablet. In FIG. 1, reference numeral 11 denotes a document display window on which document data is displayed.

After various initializations (step 301), when a position corresponding to a certain character in the internal document data displayed in the document display window 11 is designated by the stylus pen (steps 302, 303, 304), a character string is obtained. The insertion positioning unit 4 is activated and the insertion position cursor 12 is displayed at the designated position (step 305), and this position is determined as the insertion pointer of the internal document data, that is, the position where a new character string is inserted (step 306). .

A character string writing window 13 and an operation button window 14 are arranged and displayed below the document display window 11, respectively. String writing window 1
Reference numeral 3 denotes a window for the user to write and input a character string, which is a plurality of characters, using a stylus pen. That is, when a character is written in the character string writing window 13 (step 307), the handwriting input processing unit 5 displays the handwriting of the character on the display device of the display-integrated tablet 1 as it is (step 308). A sequence of coordinate values corresponding to handwriting is stored as handwriting data (step 30).
9). Note that there is no frame in the character string writing window 13 that separates the entry positions of individual characters.

On the other hand, a recognition button 14a and an end button 14b are displayed in the operation button window 14. When the recognition button 14a is designated with the stylus pen (step 310), the blank-mixed character string recognition processing unit 3 is started, and blank-mixed character strings are recognized for the writing data stored in the handwriting input processing unit 5 (step 310). 311).
When the character string recognition is completed, the recognition result of the character string is inserted into the insertion pointer of the internal document data (step 31).
2). Thereafter, the handwriting data stored in the handwriting input processing unit 5 and the handwriting of the character displayed in the character string writing window 13 are cleared (steps 313 and 314).

When the end button 14b is pressed (step 315), the end processing unit 2 is activated, and the internal document data displayed on the document display window 11 is stored in the internal document data storage unit 6 (step 316). . This completes one character string insertion process (step 31).
7).

Next, the procedure of the above-described character string recognizing process including spaces will be described with reference to FIGS. 4 and 5. FIG.

First, as shown in FIG. 5, a character string recognizing processing unit 3 including a blank includes a maximum value ymax of the writing data in the y-axis direction.
And the minimum value ymin (step 40).
1). Next, the blank-mixed character string recognition processing unit 3 obtains a projection value which is a black density value on each x coordinate of the handwritten data (step 402).

Subsequently, the blank-mixed character string recognition processing unit 3 calculates the lengths α1, α2,..., Αm of the m (7 in FIG. 5) blank portions where the projection value is 0, respectively. Are obtained (step 403).

Here, it is assumed that an expression for obtaining the number n of blank codes from the length of the blank portion is given as follows. n = [εα / (ymax−ymin)] where ε is a coefficient determined empirically, and n is a value obtained by excluding the decimal part from the value of [εα / (ymax−ymin)].

Next, the character string recognition processing unit 3 including a blank
From the blank portions on the left side of the blank portions (step 404), the value of n is obtained using the above equation (step 4).
05). Then, it is determined whether or not the value of n in the blank portion exceeds 1 (step 406), and if it does not exceed 1, the n value is similarly calculated for the next blank portion. If it exceeds 1, this blank portion is determined as a portion into which n blank codes are to be inserted, and the blank portion between the current blank portion and the immediately preceding blank portion (the blank portion into which the blank code is inserted) is determined. Recognition of a character or a character string for the sandwiched writing data is performed (step 407).

Thereafter, the character string recognizing processing unit 3 including blanks combines the character code string obtained as a result of the current recognition with n blank codes concatenated with the character code string obtained in the previous processing. The connection is made later (step 408), and the processing for the next blank portion is performed again.

When the processing is completed for all m blank portions in the written data (step 409), the character code string including the blank code obtained so far is output as the final recognition result, and the document display window 11 is displayed. This is inserted into the character string insertion position (step 410).

Thus, according to the online character input device of this embodiment, an appropriate number of blank codes can be automatically embedded in a portion of the character string that is to be blanked by opening and writing. Thus, it is possible to input a character string containing spaces with a very natural feeling.

In the above-described embodiment, the case where the character string is written horizontally is described. However, in the case of the vertical writing, a character string mixed with blanks can be similarly written.

[0027]

As described above, according to the on-line character input device of the present invention, an appropriate number of blank codes are automatically inserted in a portion of a character string that is to be blanked by opening and writing the portion. Can be embedded, whereby a character string mixed with blanks can be written with a very natural feeling.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an online character input device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a screen displayed on a display-integrated tablet.

FIG. 3 is a flowchart showing a flow of an overall operation in the online character input device of FIG. 1;

FIG. 4 is a flowchart illustrating a procedure of a character string recognizing process including white space.

FIG. 5 is a diagram illustrating an operation of detecting a blank portion from writing data.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Display integrated tablet, 2 ... End processing part, 3 ... Character string recognition processing part mixed with blank, 4 ... Character string insertion positioning part,
5: handwriting input processing unit, 6: internal document data storage unit.

Claims (2)

(57) [Claims] 1. A coordinate input device for inputting coordinate values specified by using a pen-shaped pointing device, and writing data for inputting a sequence of coordinate values input from the coordinate input device as writing data of a character string mixed with blanks. Input means, and y of the handwritten data input from the handwritten data input means.
Maximum / minimum value judgment method for judging maximum and minimum values in the axial direction
The step and the y-axis direction determined by the maximum / minimum value determination means
Projection values on each x coordinate for the range between the maximum and minimum values of
And a projection value on each x coordinate calculated by the projection value calculation means.
X of a blank part existing in the handwritten data based on the shadow value
A blank length calculating means for obtaining the length in the axial direction, and at least a maximum / minimum value determining means for determining a length of the blank portion in the x-axis direction obtained by the blank length calculating means.
The maximum and minimum values of the writing data in the y-axis direction
Determining means for determining a blank portion into which a blank code is to be inserted , based on the difference between the two, An online character input device, comprising: a blank code insertion unit that inserts the blank code into a character code string that is a recognition result and outputs the blank code as a final recognition result. 2. A coordinate input device for inputting a coordinate value specified by using a pen-shaped pointing device, and writing data for inputting a sequence of coordinate values input from the coordinate input device as writing data of a character string mixed with blanks. Input means, and y of the handwritten data input from the handwritten data input means.
Maximum / minimum value judgment method for judging maximum and minimum values in the axial direction
The step and the y-axis direction determined by the maximum / minimum value determination means
Projection values on each x coordinate for the range between the maximum and minimum values of
And a projection value on each x coordinate calculated by the projection value calculation means.
X of a blank part existing in the handwritten data based on the shadow value
A blank length calculating means for obtaining the length in the axial direction, and at least a maximum / minimum value determining means for determining a length of the blank portion in the x-axis direction obtained by the blank length calculating means.
The maximum and minimum values of the writing data in the y-axis direction
Determining means for determining the number of blank portions into which blank codes are to be inserted and the number of blank codes to be embedded based on the difference between the two, and recognition for performing character string recognition on handwritten data excluding the blank portions into which the blank codes are to be inserted. Means, and blank code insertion means for inserting the number of blank codes obtained by the determination means into a character code string which is a recognition result of the recognition means, and outputting this as a final recognition result. Online character input device.