JPH0475554B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to a handwritten character recognition device having a function of displaying the stroke order and number of strokes of an input character pattern.

(b) Background of the technology Compared to ordinary character recognition devices, which recognize images of characters that have already been written, online handwritten character recognition devices input the process of writing characters, so they recognize the stroke order and number of strokes of handwritten characters. is an important feature in character recognition.

An online handwritten character recognition device that has the function of registering character patterns can register character patterns that have the characteristics of a particular writer in a dictionary, thereby identifying characters that have the characteristics of a particular writer that are not based on the standard stroke order or number of strokes. Even if a pattern is input, it will be reliably recognized, and if an erroneous recognition occurs, the erroneously recognized input character pattern will be registered as a dictionary, so that character patterns similar to the input character pattern can be recognized. , it is possible to improve the recognition rate.

However, since there is no function to determine whether the registered character patterns are truly valid, it cannot be said that the dictionary is being used efficiently.

(c) Prior art and problems When a conventional online handwritten character recognition device misrecognizes an input character pattern as described above, the system automatically registers the incorrectly recognized input character pattern in a dictionary. ,
Even if a similar character pattern is input next time, it can be recognized. However, there is no way to determine whether the input character pattern is a frequently occurring pattern that is necessary for the dictionary, or whether it is a pattern that has been written incorrectly and is unnecessary for the dictionary, so unnecessary patterns may be registered in the dictionary. Furthermore, there is a problem in that unnecessary patterns registered in the dictionary may cause misrecognition of other characters.

(d) Purpose of the Invention The purpose of the present invention is to provide a novel handwritten character recognition device that eliminates the above-mentioned drawbacks. The object of the present invention is to realize a handwritten character recognition device that can stabilize patterns and improve the efficiency of dictionary registration of input character patterns.

(e) Structure of the Invention The present invention is a handwritten character recognition device that performs recognition processing by matching input character patterns and dictionary patterns, and comprises: a tablet that converts input characters and input commands into coordinate data; an input separation circuit that identifies and separates data into input character pattern data and commands; a feature extraction circuit that extracts an input character pattern including the number of strokes and stroke order of the input character from the coordinate data; and a feature extraction circuit that stores the input character pattern. A memory circuit, a dictionary that registers dictionary patterns, a matching circuit that matches the input character pattern with the dictionary pattern, a display section that displays characters recognized by the matching circuit, and the command. a command analysis circuit that distinguishes and separates the quantity display command and the registration command; a feature quantity display control circuit that displays the input character pattern stored in the memory circuit on the display section according to the feature quantity display command; and the registration command. a registration control circuit for registering the input character pattern stored in the memory circuit in the dictionary;
The feature amount display command causes at least one of the number of strokes and the stroke order of the input character pattern stored in the memory circuit to be displayed on the display section via the feature amount display control circuit, and the registration command causes the memory circuit to This can be achieved by a handwritten character recognition device characterized in that the input character pattern is registered in the dictionary via the registration control circuit.

(f) Examples of the invention The present invention will be explained below with reference to the drawings.

Figure 1 shows an example of a handwritten character recognition device according to the present invention, and Figure 2 shows an example of displaying recognized characters according to the present invention, where (A) is an example of displaying only recognized characters, and (B) is the number of strokes and stroke order. FIG. 3 shows an example of stroke order display according to the present invention.

In the figure, 1 is a tablet, 2 is an input separation circuit, 3 is a feature extraction circuit, 4 is a memory circuit, 5 is a matching circuit, 6 is a dictionary, 7 is a command analysis circuit, 8 is a registration control circuit, and 9 is a feature value display. A control circuit and 10 indicate a display section, respectively.

The embodiment shown in FIG. 1 is a special planar device that converts the written characters into coordinate data by writing characters in a predetermined position with an attached pen (not shown) and outputs the data to the input separation circuit 2. A tablet 1, an input separation circuit 2 that identifies and separates input data whether it is input character pattern data or a command, and a feature extraction circuit that extracts an input character pattern including stroke order and number of strokes from the input character pattern data that has been identified and separated by the input separation circuit 2. 3. A memory circuit 4 that stores the output data from the feature extraction circuit 3 in a numbered manner; matches the input character pattern with the dictionary pattern (standard character pattern) registered in the dictionary 6 (the input character pattern and the standard character pattern); A matching circuit 5 that outputs the recognized characters to the display unit 10 registers a standard character pattern for matching and recognizing the input character pattern. A command analysis circuit 7 analyzes the commands identified and separated by the input separation circuit 2 and analyzes what control the output commands are used for. A dictionary 6 analyzes the data stored in the memory circuit 4 based on the output signal from the command analysis circuit 7. 6, and a registration control circuit that performs control to register the character pattern to 6, and a feature that controls to display the number of strokes and stroke order of the input character pattern stored in the memory circuit 4 on the display unit 10 based on the output signal from the command analysis circuit 7. quantity display control circuit 9;
It consists of a display section 10 that displays the number of strokes and stroke order of recognized characters and input character patterns.

Next, the operation of this embodiment will be explained based on FIGS. 2 and 3. The description of this embodiment is based on a case where a specific author writes the information, and it is assumed that the contents registered in the dictionary 6 are standard character patterns including the characteristics of the specific author.

When a predetermined character is written on the tablet 1 with a pen (not shown) attached to the tablet 1, the input separation circuit 2 identifies and separates it as input character pattern data, and outputs the input character pattern data to the feature extraction circuit 3. .

Based on this input character pattern data, the feature extraction circuit 3 extracts an input character pattern including stroke order and number of strokes, and outputs the extracted input character pattern to a memory circuit 4 and a matching circuit 5.

The matching circuit 5 matches the input character pattern including the stroke order and number of strokes with the standard character pattern registered in the dictionary 6, and displays the result on the display unit 10.
to be displayed. FIG. 2(A) shows an example of the display of recognized characters.

On the other hand, the memory circuit 4 stores the input character pattern including the stroke order and number of strokes together with a number indicating the position of the input character written on the tablet 1.

The author checks the characters recognized and displayed online on the display unit 10, and if he discovers that the character "certification" in the display example in Figure 2 A is misrecognized,
In order to confirm the cause of the misrecognition, the user specifies the character position of "recognized" and inputs a feature amount display command using the tablet 1.

The input separation circuit 2 identifies and separates the command as a command and outputs the command to the command analysis circuit 7. The command analysis circuit 7 analyzes that the input command is a feature amount display command, and
It is output to the feature value display control circuit 9. The feature amount display control circuit 9 takes in the input character pattern corresponding to the number of the designated character position from the memory circuit 4, and displays the number of strokes and stroke order of the input character pattern (14 strokes, 14 strokes, stroke order).

As for the stroke order, only one stroke is displayed, and by inputting the next stroke display command, the stroke order is displayed sequentially according to the stroke order (the stroke order written by the author). At the end, by inputting an end command, the display of the number of strokes and stroke order is ended and the display returns to the one shown in FIG. 2A.

There is no particular problem when checking with the above feature value display, so if it is determined that it is necessary to register as a standard character pattern, a registration command is inputted using the tablet 1, and the registration command is sent to the registration control via the input separation circuit 2 and the command analysis circuit 7. The registration control circuit 8 takes in the specified input character pattern from the memory circuit 4 and registers it in the dictionary 6.

By providing the feature amount display function as described above, (1) the characteristics of the writing style unique to a particular writer (different from regular calligraphy, that is, the number of strokes fluctuating, differences in the number of strokes depending on the character shape, differences in stroke order, etc.); 2) Be able to write characters on Tablet 1 while understanding the characteristics of each character pattern (such as the difference between correctly recognized and incorrectly recognized cases).

(g) Effects of the Invention According to the present invention as described above, the points to keep in mind when inputting characters are recognized, so input characters are stabilized, and by looking at the characteristics of erroneously recognized character patterns, dictionary Since it is possible to judge whether a dictionary is necessary or not, it is possible to provide a handwritten character recognition device that can efficiently utilize the dictionary capacity and avoid the disadvantages caused by unnecessary dictionaries.

[Brief explanation of the drawing]

FIG. 1 shows an example of a handwritten character recognition device according to the present invention, FIG. 2 shows an example of a display of recognized characters according to the invention, and FIG. 3 shows an example of a stroke order display according to the invention. In the figure, 1 is a tablet, 2 is an input separation circuit, 3 is a feature extraction circuit, 4 is a memory circuit, 5 is a matching circuit, 6 is a dictionary, 7 is a command analysis circuit, 8 is a registration control circuit, and 9 is a feature value display. A control circuit and 10 indicate a display section, respectively.

Claims (1)

[Claims] 1. A handwritten character recognition device that performs recognition processing by matching input character patterns and dictionary patterns, comprising: a tablet that converts input characters and input commands into coordinate data; and a tablet that inputs the coordinate data. an input separation circuit that identifies and separates character pattern data and commands; a feature extraction circuit that extracts an input character pattern including the number of strokes and stroke order of the input character from the coordinate data; and a memory circuit that stores the input character pattern. , a dictionary in which dictionary patterns are registered, a matching circuit that matches the input character pattern with the dictionary pattern, a display unit that displays characters recognized by the matching circuit, and a feature value display command that uses the command as a feature amount display command. a command analysis circuit that identifies and separates the input character pattern stored in the memory circuit according to the feature display command, and a feature display control circuit that displays the input character pattern stored in the memory circuit on the display unit according to the feature display command; a registration control circuit that registers the input character pattern stored in the circuit in the dictionary;
The feature amount display command causes at least one of the number of strokes and the stroke order of the input character pattern stored in the memory circuit to be displayed on the display section via the feature amount display control circuit, and the registration command causes the memory circuit to A handwritten character recognition device characterized in that the input character pattern is registered in the dictionary via the registration control circuit.