JPS59188787A - Input device of on-line manuscript character - Google Patents

Abstract

PURPOSE:To allow much change in stroke number and also to minimize the calculating amount by storing the upper limit and the lower limit number of the stroke number predetermined at each character being object of recognition. CONSTITUTION:The position information P of a pen chip inputted from a table section 1 is read continuously in a recognizing section 2 and also the on/off information of the pen chip is inputted to a stroke number count section 3. On the other hand, the upper and lower limit of the stroke number of a character corresponding to each standard pattern are stored in a stroke number upper/lower limit memory section 5, and whether or not the stroke number counted by the count section 3 is between the upper limit number and the lower limit number in the memory section 5 is discriminated by a comparison section 6, and when the number is between them, a standard pattern R is read from the recognizing section 2 for calculating matching and when not between them, the stroke number to the next standard pattern is discriminated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an online handwritten character input device that inputs and recognizes handwritten characters written on a tablet online.

Conventionally, characters written on a tablet were divided into strokes (1
There are already methods for recognition that do not rely on the number of times the pen is turned on and off while writing. For example, the patent application 1986-1
There is a method as described in the specification of No. 94174 (hereinafter referred to as document (1)). This method first converts input characters into a time-series pattern of the direction of movement of the pen tip. At this time, the input characters are converted uniformly regardless of whether the pen is on or off, just like a single stroke, and the input button is pressed. This manual button is recognized by matching it with a standard pattern that is stored in advance as data in the same format as the input button.

In such a method, it is inefficient to perform matching calculations on all standard patterns to be recognized, so it is preferable to narrow down candidates in advance before performing matching subtraction. One way to narrow down the candidates is to use the number of strokes as a standard.

That is, this is a method in which recognition is performed by limiting recognition candidates to only characters whose number of strokes is within a certain standard number of strokes to several tens of strokes. However, this method of allowing only a certain number of strokes for all characters has the disadvantage that some characters may be misrecognized because the range is too narrow, or it requires extra calculations because the range is too wide. It had the disadvantage of being done. For example, if a change of ±2 strokes is allowed for the standard number of strokes, extra calculations will be performed because the character "-" is normally not written with more than one stroke. Furthermore, the character ``品'' is usually written with between 9 and 3 strokes, and in this case, if it is written with 3 strokes, it will be misrecognized.

An object of the present invention is to allow many changes in the number of strokes and to minimize the amount of calculation when selecting candidates for recognition based on the number of strokes.

In order to achieve this object, the online handwritten character input device according to the present invention includes a tablet unit that detects traces of handwritten characters online as position information and pen on/off information, and pen on/off information of the tablet unit. a stroke number counting section that counts the number of strokes in one character; a stroke number memory section that stores predetermined upper and lower limits of the number of strokes for each character to be recognized; and the stroke number counting section. Determine whether the number of strokes of handwritten characters counted by is between the upper limit and the lower limit of the number of strokes,
The recognition unit includes a recognition unit that performs recognition processing on the character to be recognized only when there is ζ between the upper limit and the lower limit.

The present invention will be described in detail below based on a specific example. The figure is an overall configuration diagram of an embodiment according to the present invention.

The pen tip position information P input by the tablet unit 1 is continuously read into the recognition unit 2. At the same time, the on/off information S of the pen tip is input to the stroke number counting section 3, and the number of on/off times in one character is counted. The written characters are recognized and output by the recognition section 2. As the recognition method, the method described in document (1) is used. That is, the input positional information of the pen tip is converted into time-series data of the moving direction angle of the pen tip, that is, the input button. Then, the standard batons R stored in advance in the standard baton memory section 4 as time-series data of movement direction and angle are sequentially read out and matching calculations are performed between them and the input batons to determine the distance between the batons. The character with the smallest distance and corresponding to the pre-standard pattern is output as the recognition result.

The stroke number upper and lower limit memory section 5 holds upper and lower limits of the number of strokes of characters corresponding to each standard pattern. Before reading out the standard pattern, the stroke number comparing section 6 compares the stroke number N counted by the stroke number counting section 3 with the upper limit number Nmax and the lower limit number N min in the stroke number upper and lower limit memory section 5.
It is determined whether or not there is a difference between the two. If the upper limit number Nmax
, and the lower limit number N min , the stroke number comparison unit 6 outputs an instruction signal C to the recognition unit 2 to read out the standard pattern and perform matching calculation. Further, if the number of strokes N is not between the upper limit number Nmax and the lower limit number Nmin, the instruction signal C is not output. Therefore, no matching calculation is performed for that standard pattern.

Continuing on, the stroke number comparing section 6 determines the number of strokes for the next standard pattern.

Therefore, instead of setting a fixed stroke range for the standard number of strokes as in the conventional technology, it is possible to set the upper and lower limits of the number of strokes for each character in detail, thereby eliminating unnecessary matching calculations. You don't have to do it. Furthermore, characters with a wide range of possible stroke numbers can be recognized correctly if the upper and lower limits of the stroke number are set correctly.

Although one embodiment of the present invention has been described above, the present invention is not limited to this embodiment. In particular, if the character recognition method in the recognition unit is an online handwritten character recognition method that does not depend on the number of strokes,
Any method can be used.

[Brief explanation of drawings]

The figure is a block diagram showing the overall configuration of an embodiment according to the present invention. In the figure, 1 is a tablet section, 2 is a recognition section, 3 is a stroke number counting section, 4 is a standard slam memory section, 5 is a stroke number upper and lower limit memory section, and 6 is a D-number comparison section. rqff1 person zubinmi r, j”4) Hara Miishi ζ5 4

Claims (1)

[Claims] a tablet unit that detects the handwriting of handwritten characters online as location information and pen on/off information; a stroke number counting unit that counts the number of strokes in one character based on the pen on/off information of the tablet unit; and a recognition device. a stroke number memory section that stores upper and lower limits of the number of strokes predetermined for each target character; and a stroke number of the handwritten character counted by the stroke number counting section that is the upper and lower limits of the number of strokes. 1. An online handwritten character input device comprising: a recognition unit that determines whether or not the character is between the upper limit and the lower limit, and performs recognition processing on the character to be recognized only when the character is between the upper limit and the lower limit.