JP2989072B2 - Handwritten 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 a handwritten character input device, and more particularly, to a handwritten character input device having a function of displaying handwritten characters input on a tablet with a pen.

[0002]

2. Description of the Related Art Conventionally, a tablet is often used as a device for inputting handwritten characters. A character is written on the tablet by using an input pen, and a locus of the pen is pointed and pointed based on the writing information. Handwritten characters are displayed as image images as they are connected by lines.

[0003]

However, in the conventional handwritten character input device, if there is no input frame or input auxiliary line on the tablet, the size of characters written with a pen on the tablet may vary. However, there is a problem that the character string is inclined in the middle and becomes difficult to read.

[0004] The present invention has been made in view of the above-mentioned circumstances, and is made by aligning the lines of the input handwritten characters or by keeping the size of the handwritten characters and the width between the lines constant. It is an object of the present invention to provide a handwritten character input device capable of making a read character string easier to read.

FIG. 1 is a block diagram showing the configuration of the present invention. As shown in the figure, the invention is handwriting input sentence
An input means 1 for detecting the handwritten information on the start and end points of the character, the stroke detecting unit 2 for performing <br/> discovery of coordinate data relating to the locus of the input from the handwritten information, input by handwriting
A coordinate data storing unit 4 to memorize coordinate data for the stroke from the starting point of the character to the end point, the stored seat
A feature extraction unit 3 for extracting information relating to a change in coordinates and a discontinuity required for extracting a line of a character string arranged in the same direction and extracting characters arranged on the line using the mark data ; Line extracting means 5 for extracting lines consisting of character strings arranged in the same direction and having continuous connections from the extracted information, and extracting characters from information extracted for the extracted lines. Character extracting means 6 for performing the following, and each of the character strings on the extracted line
For each character, center the character from the character's coordinate data.
All the character strings on the extracted line
For redisplaying the average value of the coordinate positions for the characters
A reference position calculating means 9 as a reference position ;
A coordinate data conversion means 7 for converting the coordinate data of each character so that each character of the character string on the line cut out as a reference is arranged , and a handwritten input based on the converted coordinate data.
Display means 8 for redisplay of characters, there is provided a handwriting input apparatus characterized by comprising.

Here, in order to redisplay the character string of each line inputted by handwriting so that the line interval becomes constant, the coordinate data conversion means considers the width between the lines and redisplays each line. A reference position may be set, and the coordinate data of each character may be converted such that handwritten characters are arranged on the reference position.

[0007] The character data may be redisplayed by converting the coordinate data of each character so that the size of all the characters input by handwriting becomes a certain size. further,
Based on the coordinates and character size information obtained from the handwritten input character string, calculate the reduction / enlargement ratio of each character, convert the coordinate data, align the characters in one line, and redisplay them. It may be.

As display means, a CRT, a liquid crystal (LC)
D) is usually used. As the input means, the horizontal axis (X
For example, a tablet or display panel having coordinates of an axis) and a vertical axis (Y axis) and having a function of generating position coordinates (X, Y) when a pen is pressed is used.

Further, each means of stroke detection, feature extraction, line segmentation, character segmentation, and coordinate data conversion is realized by a CPU. The coordinate data, display data, conversion constants, and the like are usually stored in a RAM, and a program describing processing procedures such as input, data conversion, and display is stored in a ROM.

[0010]

According to the present invention, when the handwriting character is inputted by the input means, the coordinates of the strokes constituting the character are stored, and the line is cut out.
By cutting out characters, converting the coordinate data of strokes based on the information of each line and each character, and redisplaying them, it is possible to make the input character string easier to read. Furthermore, by narrowing the space between lines or displaying characters in a reduced size, it is possible to input more characters on the same screen.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings. Note that the present invention is not limited to this. FIG. 2 shows a block diagram of the configuration of the embodiment.
Here, the tablet 11 is for inputting handwritten characters with a pen and detecting handwritten information regarding a start point and an end point of handwriting.

The stroke detecting section 12 detects and holds coordinate data relating to the trajectory of the input from the handwritten information, and the coordinate data storing section 14 stores the coordinate data of the stroke from the start point to the end point of the handwriting. It is.

The feature extracting unit 13 uses information on the detected strokes to extract a line of a character string arranged in the same direction and to determine whether or not a change in coordinates required for extracting a character arranged on the line. The continuity information is extracted, the line cutout unit 15 cuts out a line indicating a continuous connection of character strings arranged in the same direction from the extracted information, and the character cutout unit 16 is extracted for the cutout line. Characters are extracted from the information.

The coordinate data converter 17 converts coordinate data of handwritten characters so as to correspond to a fixed reference position.
The display unit 18 redisplays the handwritten character based on the converted coordinate data.

FIG. 3 shows a schematic flowchart of the re-display process in one embodiment. The user uses the tablet 11
After inputting a character string above, if redisplay is instructed to make it easier to read, processing for redisplay is performed.

Step 1. When the user inputs characters on the tablet 11 with a pen, writing information is sent to the stroke detection unit 12 with the movement of the pen. Step 2. The stroke detection unit 12 detects the pen-ON writing information based on the writing information. And then pen O
Until the writing information in the FF state is detected, the stroke information is held by the stroke detection unit 12 as coordinate data. Step 3. When the stroke detection unit 12 detects the writing information in the pen OFF state, the stroke detection unit 12 instructs the feature extraction unit 13 that a stroke has been input, and sends the coordinate data.

Step 4. The feature extraction unit 13 stores the sent coordinate data in the coordinate data storage unit 14, extracts features necessary for line segmentation, character segmentation, and the like, and sends them to the line segmentation unit 15 and the character segmentation unit 16. . Step5. The line cutout unit 15 cuts out a line due to a lapse of time after a stroke input or a large change in coordinate data (for example, a large change from the right end to the left on the tablet) and the like, and information on strokes constituting the line. To the character cutout unit 16.

Step 6. The character cutout unit 16 cuts out characters in consideration of the space between characters (here, a group of strokes considered to be one character), the aspect ratio of the characters, and the like based on the characteristics of the extracted strokes. The feature necessary for the coordinate conversion is extracted and sent to the coordinate data conversion unit 17. Step 7. When the user instructs a re-display, the coordinate data conversion unit 17 determines the coordinate data storage unit 14 based on the character features and the reference position for each cut character.
Is converted and sent to the display unit 18.

Next, specific examples of the embodiment will be described with reference to FIGS.
Explanation will be made using 0. Now, consider a case where the user inputs a character string as shown in FIG. 4 on the tablet with a pen on one line, and then inputs a first stroke on the second line. In FIG. 4, when the first stroke of the second line is input, the coordinate data in the X direction greatly changes from the right end to the left, so that the first line can be cut out. FIG. 5 shows the result of extracting characters on the extracted line based on the overlap of strokes in the X direction.

Based on the characteristics of the strokes constituting the cut-out character, the minimum value (x
_min, y _min ) maximum value (x _max, y _max ), character height h,
Calculate the width w and the like. Next, in the present embodiment, the reference position y
_base is the median value (y _min +
y _max ) / 2. When there are n characters in one line, the reference position y _base is obtained by the following equation (1).

[0021]

(Equation 1)

Next, conversion of coordinate data will be described.
First, as shown in FIG. 6, the median value of the character in the Y direction (y _min + y
_max ) / 2 and the difference Δh between the reference position y _{base of the} line and the y coordinate value of the coordinate data of the stroke constituting the character are represented by Δh
Correct only. That is, assuming that the converted y-coordinate value is y ', it can be obtained by the following Expression 2.

[0023]

(Equation 2) FIG. 7 shows an example in which the coordinates of the input shown in FIG.

Next, a case where the reference position y _base is updated with a predetermined constant line gap Δy _base will be described. Now, when the character string of the nth line is input, the reference position y _base (i) of the i-th line is obtained by the following equation (3).

[0025]

(Equation 3) FIG. 8 (b) shows the input of FIG. 8 (a) and the coordinate data is converted using the above equation 2 based on the reference position obtained by the above equation 3, and the characters are aligned and displayed again. An example is shown.

Next, a case where the character sizes in the Y direction are made uniform will be described. Now, in the case where the height of the character is set to h, assuming that the y coordinate value after conversion is y ′, it can be obtained by the following Expression 4.

[0027]

(Equation 4) FIG. 9 shows an example in which the input of FIG. 8 (a) is used to convert coordinate data by using the above formula 4 to make the heights of the characters uniform and redisplay. Similarly, FIG. 10 shows an example in which the height and width of the character are reduced at a fixed reduction ratio and displayed again in response to the input of FIG.

[0028]

According to the present invention, a line is cut out from the feature extracted from the writing information, a character is cut out from the line, the coordinate points of the character are converted, and the character is aligned and displayed again. Therefore, the input character information can be easily read. Also, set the line spacing to a certain fixed interval, narrow the line spacing and arrange the characters in one line, and redisplay the characters, normalize or reduce or enlarge the characters to a predetermined size, and redisplay the characters in a line This makes it easier to read the input characters and allows more characters to be input on the same screen.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of the present invention.

FIG. 2 is a block diagram showing a configuration of an embodiment of the present invention.

FIG. 3 is a flowchart of redisplay according to an embodiment of the present invention.

FIG. 4 is a diagram showing an example of character input in one embodiment of the present invention.

FIG. 5 is a diagram showing a character cutout result in one embodiment of the present invention.

FIG. 6 is a diagram showing a relationship between a reference position of a line and a character in one embodiment of the present invention.

FIG. 7 is a diagram showing an example in which the coordinate data of each character is converted and the characters are aligned and displayed again in one embodiment of the present invention.

FIG. 8 is a diagram showing an example in which characters are aligned in one line and displayed again with a constant line spacing in one embodiment of the present invention.

FIG. 9 is a diagram showing an example in which the height of characters is displayed again according to the embodiment of the present invention.

FIG. 10 is a diagram showing an example in which characters are reduced and characters are aligned in one line and displayed again in one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Input means 2 Stroke detection means 3 Feature extraction means 4 Coordinate data storage means 5 Line cutout means 6 Character cutout means 7 Coordinate data conversion means 8 Display means

Claims (4)

(57) [Claims] 1. A input means for detecting the handwritten information on the start and end points of the handwritten input character, and line <br/> Cormorant stroke detecting means discovery of coordinate data relating to the locus of the input from the handwritten information, handwriting input the coordinate data of the stroke from the starting point of the character to the end point which is remembers
Using coordinate data storage means for storing, and using the stored coordinate data , information on the change and discontinuity of the coordinates necessary for cutting out a line of a character string lined up in the same direction and cutting out a character lined up on the line feature extracting means for extracting, from the extracted information, the line extracting means for cutting out a row of strings having a <br/> successive ties a string arranged in the same direction, cut Character extracting means for extracting characters from the information extracted for the extracted line, and for each character of the character string on the extracted line,
Find the coordinate position at the center of the character from the coordinate data of
The above for all characters in the character string on the cut line
A reference that uses the average value of coordinate positions as the reference position for redisplay
A position calculating unit, based on the reference position, on the cut-out String
Coordinate data conversion means for converting the coordinate data of each character so that each character is lined up, and display means for redisplaying the handwritten input character based on the converted coordinate data. Handwritten character input device. 2. A reference position for redisplaying each line of the coordinate data conversion means is set so that a line interval of a handwritten input character string lined up in the same direction is a predetermined constant interval. 2. The handwritten character input device according to claim 1, wherein the data is displayed again. 3. The coordinate data converting means converts the coordinate data so that the size of all the characters input by handwriting becomes a set fixed size, and aligns the characters in a line and redisplays the characters. The handwritten character input device according to claim 1 or 2, wherein: 4. A coordinate data conversion means calculates a reduction / enlargement ratio of each character based on information obtained from a character string input by handwriting, converts the coordinate data, aligns the characters in a line, and re-executes the processing. 4. The handwritten character input device according to claim 1, wherein the handwritten character is displayed.