JPH0239826B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an online handwritten character recognition device.

(Background Art) A conventional online handwritten character recognition device is shown in FIG. In Fig. 1, 1 is a tablet, 2 is a pen, 3 is a recognition section, 4 is a control section, 5 is a display section, and 6 is a printing section. , the characters are written on paper, the strokes are sent moment by moment to the recognition section 3, the characters written on the tablet 1 are recognized, and the characters recognized by the recognition section 3 are sent to the display section 5 by the control section 4. The document was sent and displayed, edited or proofread by a scribe using a keyboard section (not shown), and then output to the printing section 6.

Therefore, a tablet 1 as an input section and a display section 5 as a temporary output section are required, and when trying to construct an inexpensive device, the price increases, and beyond a certain limit, it is difficult to create an inexpensive online handwritten character recognition device. The major drawback was that it could not be provided.
Furthermore, since the input section and the output section are separated, the operator has to look at the input section and the output section alternately, which not only puts strain on the eyes but also slows down the operation speed.

(Problems to be solved by the invention) An object of the present invention is to solve the above-mentioned drawbacks.
An object of the present invention is to provide an online handwritten character recognition device capable of inputting handwritten character data via an input/output board and displaying characters recognized based on this data on the input/output board. .

In order to achieve the above object, the online handwritten character recognition device of the present invention includes an input/output board in which a plurality of emitting elements of at least two character frames are arranged in a matrix, and each light emitting element of the input/output board is sequentially connected to the input/output board. A counter and a drive circuit that select only a predetermined selection period and emit light for first and second times that do not overlap each other set within the selection period, a switch at the tip, and a light emitting element that emits light from the light emitting element. A slender pen provided with a light receiving section that receives light, and a corresponding character or character based on data obtained by sampling the light reception signal output from the light receiving section within the first time when the switch is on. a recognition unit that recognizes a symbol, and at the second time,
The apparatus is characterized by comprising means for causing the light emitting element to emit light according to a predetermined pattern corresponding to the character or symbol recognized by the recognition unit.

(Structure and operation of the invention) FIG. 2 is a block diagram showing an example of the present embodiment, in which light emitting diodes 7 are densely embedded with their light emitting surfaces facing upward, and at least two or more characters can be written. A light emitting diode group having a width of 10 is a line selection counter in the Y direction (hereinafter referred to as Y-D).
-C), 11 is a decoder driver (hereinafter referred to as Y-D) that drives the line in the Y direction, 12 is a pen with a light receiving part and a switch at the tip, and 13 is a signal from the pen 12 (X-C). 8 and (Y-
C) Sample circuit that samples 10 values, 14
15 is a matching circuit that matches the X and Y information of the dot pattern of the font memory 14 with the values of (X-C)8 and (Y-C)10. (The printing section shown in FIG. 1 has the same function, so a description thereof will be omitted.)

Details of the light emitting diode group 7 are shown in FIG. Figure 3 shows an input/output device for two characters with a length of 15 mm and a width of 30 mm, and is composed of 4 light emitting diodes/mm. Therefore, 120 light-emitting diodes are arranged in the X direction and 60 in the Y direction, and the anode side is interconnected to the X-ray and led out to lines 1 to 120.
It is connected one-to-one to (X-D) 9 in FIG. Further, the cathode side of the light emitting diode is interconnected to the Y line and led out to lines 1 to 60, and the (Y
-D) Connected to 11 on a one-to-one basis. Also, (X-
D) A current is drawn to the line selected by 9;
Since current flows into the line selected by (Y-D)11, at a certain point, (X-D)9 and (Y
-D) 1 on the matrix selected by 11
Only the two light emitting diodes will emit light.
The present invention will be described in detail below from a functional perspective.

(X-C) While 8 counts 1, (Y-C)
10 is configured to count 60. Therefore, in order to sample input data, the light emitting diodes emit light sequentially from the top left to the bottom, and when the light emitting diode at the bottom left emits light, the top light emitting diode in the second row from the left emits light, and so on. . Here, the light emission timing of each light emitting diode will be explained.

FIG. 4 is a diagram showing the light emission timing of the light emitting diode group 7. In Figure 4, a is (Y-
C) A specific count value of 10 indicates one selection period for emitting light from a specific one of the light emitting diode group 7, for example the (1, 1) light emitting diode in the matrix shown in FIG. c indicates the first time during which the light emitting diode group 7 sequentially emits light in order to detect the position of the pen 12 within one selection period shown in , and c indicates the light emission time to display the character or code recognized by the device. A second time period for generating a light emitting diode selected from the diode group 7 is shown.

Here, the lengths of the first and second times are controlled by a signal input from the matching circuit 15 to (Y-D) 11.

Further, the first time period is selected such that the length of the first time period is long enough for the light receiving section of the pen 12 to output a light reception signal in response to the light from the light emitting diode group 7, and The light emitting diodes are selected to emit light in sequence according to the count values of (X-D)9 and (Y-C))10. On the other hand, in the second time, the recognized characters are (Y-
C) In order to avoid flickering of the display when displayed by light emitting diodes within the selection period given by the count value of 10, its length is as long as possible considering the presence of the first time. has been selected to be.

Therefore, focusing on one light emitting diode, its selection period is divided into the first time allocated for detecting the position of the pen 12 and the first time allocated for displaying the confirmed character. It is divided into two periods. The font memory 14 outputs a dot pattern corresponding to a "hand", and the horizontal and vertical information of the dot pattern and (X-
Matching with the data of C) 8 and (Y-C) 10 is determined by the matching circuit 15, and if there is a match, that is, the point corresponding to the dot pattern of the character "hand" is set as (X-
When C)8 and (Y-C)10 indicate, (X-D)
9 and (Y-D) 11 drive the light emitting diode. The driving timing is the timing shown in FIG. 4c.

In the same manner, by starting to write the character ``written'' on the left side of the diode group 7, a dot pattern corresponding to ``written'' is output on the right side of the diode group 7, and the character ``written'' on the left side of the diode group 7 is output. In the process of erasing the dot pattern corresponding to "hand",
It is used as an input section and an output section one after another.

Here, the pen 12 will be explained in more detail. As described above, the pen 12 is equipped with a light receiving section and a switch at its tip. When the tip of the pen 12 is placed on the light emitting diode group 7, the switch at the tip of the pen 12 operates, and the light receiving section becomes able to receive light. work like that. Furthermore, since the timing at which the light receiving section receives light is controlled to be limited to the time shown in FIG. 4b, the sample circuit 13 will not mistakenly sample the light for displaying the recognition result.

(Effects of the Invention) As explained above, in the above embodiment, the light emitting diode group 7 is not only used as an input tablet together with the light receiving section and the pen 12 equipped with a switch at the tip, but also as a display section for outputting recognition results. Can be used. A selection period for emitting light from the light emitting diode is divided into a first period for detecting the position of the pen and a selection period for displaying the recognized character, and the first period is for the pen to normally receive light. is short enough to be imperceptible to the eye, so that the second period can be long enough to be clearly viewed as a flicker-free display. Furthermore, since the counting period of the counters in the X and Y directions is increased, this is also effective in eliminating flickering.

Also, as is clear from Figure 2, (X-C)
8, (X-D)9, (Y-C)10, (Y-D)1
1, the pen 12, the sample circuit 13, and the recognition unit 3 are necessary as an online handwritten character recognition device, and the font memory 14 is essential for outputting recognition results. The above-mentioned components can function as a display device by simply performing some timing control with the matching circuit 15.

Also, as another effect, 1
Since the recognition results are displayed with a character delay, the scribe has the advantage of being able to confirm whether or not the input is correct while inputting data, which reduces eye fatigue and improves operation speed.

Next, in FIG. 2, the light emitting diode group 7 and its peripheral circuits (X-C) 8, (X-D) 9, (Y-
C) 10, (Y-D) 11, matching circuit 15, etc. are explained as separate units because they are functionally different, but they are easy to manufacture as one LSI, and they can be easily manufactured as one LSI. By creating an online handwritten character recognition device, it is possible to provide an even cheaper online handwritten character recognition device.

In the explanation of the above embodiment, when inputting to the left side of the character frame for two characters is completed and inputting to the right side starts, the dot pattern of the recognition result of the character inputted to the left side is transferred to the left side of the diode group 7. In the explanation above, the dot pattern of the recognized character is displayed after one character is inputted one after another. It is also possible to directly display the trajectory of the symbol. By directly displaying the trajectory of the character or symbol being input, the scribe can recognize the form in which the character or symbol entered by the scribe is input into the online handwritten character recognition device. If it is recognized incorrectly, the quirks of the scribe's characters will be clearly fed back to the scribe himself, resulting in the effect of promoting the learning effect of the scribe.

Further, in the above embodiment, the matrix of light emitting diodes has been described, but it is needless to say that this is not limited to light emitting diodes, and may be an electroluminescent display or the like.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a conventional online handwritten character recognition device, Fig. 2 is a block diagram showing an embodiment of the present invention, Fig. 3 is a detailed view of a group of light emitting diodes 7, and Fig. 4 is a block diagram of a light emitting diode group 7. It is a figure which shows the light emission timing. DESCRIPTION OF SYMBOLS 1... Tablet, 2... Pen, 3... Recognition unit, 4... Control unit, 5... Display unit, 6... Printing unit, 7... Light emitting diode group, 8... X-ray selection counter, 9 ...X-ray decoder driver, 10...
. . . Y-line selection counter, 11 . . . Y-line decoder/driver, 12 .

Claims (1)

[Scope of Claims] 1. An input/output board in which a plurality of light emitting elements of at least two character frames are arranged in a matrix; each light emitting element of the input/output board is sequentially selected for a predetermined selection period, and the selection period is a counter and a drive circuit that emit light at first and second times that do not overlap with each other set within the pen; a switch at the tip; and an elongated pen provided with a light receiving part that receives light from the light emitting element. and a recognition unit that samples the light reception signal output from the light reception unit within the first time period when the switch is on, and recognizes a corresponding character or symbol based on the sampled data; and means for causing the light emitting element to emit light according to a predetermined pattern corresponding to the character or symbol recognized by the recognition unit at the second time. 2. The online handwritten character recognition device according to claim 1, wherein the first time is longer than the second time.