JPS59119485A - Character separating system - Google Patents

Abstract

PURPOSE:To use the writing paper of a free format by detecting a parameter containing the pen-up time of a handwriting mode, pen shift time and a pen shift distance, and comparing this parameter with the reference value to produce the character separating signal. CONSTITUTION:The pen up/down signal delivered from a tablet 10 and the coordinate data of characters are supplied to a discriminating circuit 11. Then the up/down signal is divided into pen-up and pen-down states and controlled. The stroke data on the pen-down mode is sent to a separating circuit 12; while the separating data on the pen-up mode, i.e., the data on the time, the direction and distance are sent to the time, direction and distance detecting circuits 13, 14 and 15 respectively. The comparators 16-18 compare the values obtained from circuits 13-15 with the reference values sent from registers 19-21 respectively. The output of comparison of three parameters is transmitted through an AND gate 22. When this output is set at 1, it is sent to the circuit 12 as a character separating signal. Then the stroke data equivalent to a character is separated. The features of this output are extracted and collated with a dictionary.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The present invention relates to an online character recognition system for handwriting on a tablet, which does not require a specific entry frame and can be used to cut out characters on a free-format entry form. It's something.

(2) Prior art and problems The conventional method for cutting out handwritten characters is as shown in Fig. 1. A sheet of paper 2 with a specific writing frame 3 printed on it is placed on a tablet 1, and characters are written in the valley frame with a pen. Fill out. In this way, by comparing the coordinates of the input character stroke with the large frame, the character is cut out. In this method, the size of the letters and the spacing between the letters are predetermined, so if it does not suit the personality of the reporter, it will be very difficult to write. There are cases where it is desired to cut out the written characters.

(3) Object of the Invention The object of the present invention is to provide a character cutting method that can stably cut out characters using a free format entry form that does not require a paper printed with a specific entry frame.

(4) In order to couple the purpose of the construction of the invention, the character cutting method of the present invention is a character cutting method that is configured based on the pen-up time during handwriting, the moving direction of the pen during pen-up, and the movement fjJJ distance. It is equipped with a circuit that detects each parameter, and a register that stores a reference value for the parameter and can be rewritten as necessary, and generates a p character cutting signal by comparing the output from the detection circuit and the contents of the register. It is characterized by the generation of

(5) Embodiments of the Invention The principle of the present invention is that characters drawn by hand with a pen on a tablet are moved from the upper left to the lower right in horizontal writing, and then moved to the upper left again for the next character.

Due to this skillful movement of the pen point, the pen-up time within one character, the movement direction and movement distance during pen-up have characteristics that are significantly different from those between characters.

For example, the pen-up time is 100m5@degrees within a character, but it is usually more than 200m8 between characters, and the direction of movement when pen-up is ±70° from left to right between characters.
While it is limited to the range of , it is not limited within the character.

The distance between characters when folding/upping is 6 of the character size.
While this indicates 0%, it is often smaller within characters.

Therefore, the time and direction when pen-up between characters.

Set a reference value that limits the entire range of distance (this is called a character extraction parameter), compare the detected value of the input pen-up signal with this reference value, and use the comparative result to create a pen-up. It is determined whether the signal is within a character or between characters, and if it is between characters, a cutting signal is generated.

FIG. 2 (α>: <b>) explains the above-mentioned principle using an example of the character '.

That is, if the starting point of the fL hook stroke of the kana character "mouth" shown in b) of the same figure is SQL, and the end point is gn, El and S2. And a pen-up signal is detected between E2 and S3.

The pen up/down signal generated in this way is shown in (α)■ in the same figure, corresponding to the coordinates in (α)■ in the same figure. From this, the time Ts and Tx at p pen up time can be found. For example, if T = 100 ms, then 4.4 value 20
The ratio is softened to 0+i8, and "0"e is output.

Also, is the movement direction θ of the writing point when the pen is raised up a coordinate? =
It is calculated as angle (fat S2) and θ2 - angle (E2Ss). As described above, if this angle is within the tolerance range of ±70°, 1'' is output, otherwise 0'' is output.

Furthermore, the movement wJ distance is calculated from the coordinates. As described above, if this distance exceeds the permissible range of 60% center of the character size, "1" is output, otherwise "0" is output.

In this way, parameters consisting of time, direction, and distance are obtained from Ben Up/Down 1d, and by comparing each with the reference value set as described above,
In the text, the comparison output of the parameter is “0”
On the other hand, character 1- naturally outputs ('I Lemo 1'), so by inputting these to a logic circuit, a reverse character cutting signal can be easily obtained, and data for one character can be cut. I can put it out.

FIG. 6 is a perspective view of an embodiment of the present invention according to the above principle.

In the same figure, the pen up/down signal and character coordinate data output from the tablet 10 are input to the data discrimination circuit 11, and are controlled separately for pen down and pen up as shown in FIG. The stroke data at the time is sent to the cutting circuit 12, and the data for cutting out at the pen-up time, that is, the time +! J, direction, and distance data are each sent to the time detection circuit 16. Direction detection circuit 1
4. The signal is sent to the distance detection circuit 15. On the other hand, the parameter storage registers 19, 20 and 21 contain time, direction, and
Store the distance reference source. This is tablet 1 in advance
It is possible to return to this standard value by writing by another means using 0, due to individual differences in characters, etc. In the ratio soft circuit 16.17.18, the detection circuit 13.14.15
1 shift from and register 19. Compare each item from -20.21 and output 1" when the above-mentioned soft relationship is established, and then use the AN
When this output becomes 1'' through the D gate 22, it is sent to the extraction circuit 12 as character extraction/No. 11, and one character's worth of stroke data is extracted.This one character's worth of stroke data is sent to the feature extraction circuit. Feature extraction is performed at 26, and comparison with words and calligraphy is performed at a matching circuit 24.The portion 25 within the broken line indicates the essential part of the present invention.

In addition, in the above explanation, the output of the comparison circuit 1<S, 17.18 is judged and a character cutting signal is generated.The logic is ANDed.
Although the structure was constructed using gates, depending on the conditions, it may be possible to use OR gates or to construct a more complicated one-sided logic using fLOM. This Bahan is also a similar @Ming ideology.

In addition, since we are dealing with parameters based on the threshold of 11 people in this book, we have set the parameters in advance. i, quasi-value ′r
.

There are people who deviate from θ and L, but at that occasion,
Parameter storage Renstar 19.20.21-e, Ji
This can be dealt with by redefining the situation to suit the reporter's personality.

(6) Effect of @Akira As explained above, according to the present invention, when the pen is raised during handwriting, the pen movement direction when 1..., 7771 and )e#
Character cutting parameters constituting a short distance are detected and each of these is compared with a reference value to generate a character cutting signal. As a result, even if there is no general writing frame, it is possible to distinguish and cut out whether the 7771 time is within a character or between characters based on the characteristics of the movement of the writing point, and a free format entry form is useful. can.

[Brief explanation of the drawing]

FIG. 41 is an explanatory diagram of a conventional example, FIGS. 2(α) and (b) are explanatory diagrams of the principle of the present invention, and FIG. 6 is an explanatory diagram of the configuration of an embodiment of the present invention. In the figure, 10 is a tablet; 11 is a data discrimination circuit, 12 is an extraction circuit, 13 is a time detection circuit, 14 is a direction/extraction circuit, 15 is a distance detection circuit, 16, 17, and 18 are comparators, and 19, 20, and 21 are Storage register, 22 indicates an AND gate. Patent applicant: Fujitsu Limited, sub-agent, patent attorney 1) Yoshishige Saka Figure 1 Figure 2 (a)

Claims (1)

[Claims] In a character device that recognizes characters handwritten with a pen on a tablet online, character cutting parameters consisting of the pen-up time when hand d, the 4!8 movement direction and movement distance of the pen when pen-up are used. It is equipped with a circuit for detecting each, and a register that stores a reference value for the parameter and can be operated as necessary, and compares the output from the above-mentioned 1. A character cutting method characterized in that a character cutting number 4H is generated by doing so.