JPS6054087A - On-line character recognizing device - Google Patents

Abstract

PURPOSE:To raise accuracy of detection of end of writing of a character and enable to input a character accurately by changing threshold value of time between strokes according to the kind of characters. CONSTITUTION:Handwriting information C of a character inputted from a tablet 1 is inputted to a character recognizing section 2 and held. At the same time, on-off-information P of a pen is inputted from the tablet 1 to a clocking section 3. Basing on this, the clocking section 3 clocks time T between strokes. This time T is compared with a threshold value TT held in a threshold value memory 5 in a comparing section 4. Different threshold values TT are held for each kind of character in the memory 5. One of these threshold values is selected by a kind of character selecting switch 6 and outputted to the comparing section 4. When time T becomes larger than the threshold value TT, a recognition start signal S is outputted from the comparing section 4. The character is recognized by the recognizing section 2 by the signal S basing on already held hardwriting information C. Thus, misjudging of end of a letter does not occr even when writing is stopped for a while during inputting of a Chinese character.

Description

[Detailed Description of the Invention] The present invention is capable of converting four characters to g based on handwriting input in real time.
#lII! This invention relates to improvements to online character recognition devices.

Conventionally, there is already a method for recognizing characters based on handwriting input in real time. Parable is patent application 1986-19417
A method using slam matching that is not described in the specification of No. 4 (hereinafter referred to as Document (1) and Necho) is effective. When recognizing characters, it is necessary to determine which part of a written handwriting constitutes a single character. There have been several methods for this determination.

One typical method is to measure the time from when the tip of a writing pen leaves the tablet to when it comes to rest on the tablet, that is, the time between character strokes.
This is a method in which one character is finished writing when this time exceeds a certain threshold. With this method, once you start writing a letter, you can rest until the end of the letter.
I have to write it down carefully. For characters with a small number of strokes, such as hiragana, katakana, alphabets, numbers, etc., it is almost impossible to rest the pen while writing them, but for characters with many strokes, such as kanji, it is possible to rest the pen while writing them. This happens often. in this way,
This had the disadvantage that if you stopped the pen while you were still in the middle of writing a single character, it would be mistakenly determined to be the end of the character, making it impossible to input the character correctly.

An object of the present invention is to improve the usability of an online character recognition device by increasing the accuracy of detecting the end of omitted characters by changing the threshold value of the time between strokes according to the character type.

According to the present invention, there is provided a timing unit that measures the time from the end of one stroke when writing a character to the start of writing the next stroke, and the time measured by the timing unit is predetermined. a character recognition unit that determines that a character has been written and recognizes the character when the threshold value exceeds the threshold; a character type discrimination unit that determines the character type of the character; There is obtained an online character recognition device comprising a threshold value memory section that changes the value of the threshold value according to the result of type discrimination.

The present invention will be described in detail below based on a specific example. The figure is a block diagram of an embodiment of the present invention. Letters entered from Tablet 1. At the same time, pen on/off information P is input from the tablet 1 to the clock section 3. Based on this, the timer 3 measures the time from when the pen is turned off to when it is next turned on, that is, the time T between strokes. The time T between these strokes is determined by the comparing section 4.
Threshold T held in threshold memory ¥1IX5 in
Compared to T. The threshold value memory section 5i stores different threshold values TT for each character type. Character type selection switch 6
ζ One of the stiffer thresholds is selected and the comparison unit 4
is output to. When the time T between strokes becomes larger than the threshold value TT, the comparison unit 4 outputs a recognition start signal S. Based on this signal S, the character recognition unit 2 recognizes the character based on the handwriting information C held in the handwriting.

This character recognition unit 2 uses a method i using slam matching as described in document (1).

For analogy, the selected character types are kanji sa υ and ragana.
Let's consider yuzu 6゜In this case, the threshold for kanji is 1
Seconds, the threshold for hiragana is 172 seconds. As a result, the recognition results will be faster when inputting hiragana.
The advantage is that even if you take a break from the pen while inputting kanji, 4 (ji) will not be judged as the end of the character.

Although one embodiment of the present invention has been described above, the present invention is not limited to this embodiment.

As for the classification of character types, the ones mentioned here are on one side, and as for the method of distinguishing character types, here I have described the method using a switch, but the characters on tabs Iy, ) and You can also use a method of determining based on position.

Furthermore, the present invention can also be used in conjunction with a method of detecting the end of a written character using a character frame. In other words, this is a method in which several character frames are created on the tablet, and when a character begins to be written in the next character frame, the previous character is completed. At this time, if the time of the stroke lb1 exceeds a certain fixed time, it is assumed that the writing of the character has ended even if the character has not yet been written in the next character frame.

As the character recognition method in the character recognition unit 21, all currently known character h3 recognition methods can be used.

[Brief explanation of the drawing]

The figure is a block diagram of an embodiment of the present invention. In the figure, 1 is a tablet, ), 2 is a character recognition section, 3 is a timekeeping section,
4 is a ratio 1 bite part, 5 is a threshold value memory part, and 6 is a character type selection switch.

Claims (1)

[Claims] A timing unit that measures the time from the end of writing a certain stroke of a character to the start of the next stroke, and the time measured by the timing unit exceeds a predetermined threshold. a character recognition unit that recognizes the end of a character and recognizes that character; a character type discrimination unit that discriminates all the character types of the character; An online character recognition device comprising: a threshold memory unit for changing a threshold value.