JPH0254591B2 - - 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, the tablet 1 as an input unit,
A display section 5 is required as a temporary output section,
When trying to construct an inexpensive device, the price increases, and a major drawback is that it is impossible to provide an inexpensive online handwritten character recognition device beyond a certain limit.

In addition, since the input section and output section are separated,
The scribe must alternate between looking at the place to write and the place to display the output, which, unlike writing on paper, is extremely uncomfortable and not only makes the scribe tired. However, a major drawback was that the input speed was slow.

(Problems to be solved by the invention) An object of the present invention is to solve the above-mentioned drawbacks.
The purpose is to provide an online handwritten character recognition device that combines the functions of a tablet 1 as an input device with a display section 5 as an output device, and its features include a matrix of cells each consisting of a light emitting diode and a light receiving transistor. At least 2
The interface surface that constitutes the above character frame,
a counter and drive circuit that scans the cells and sequentially selects and drives them; a pen that has a switch and a light emitting section at its tip and illuminates the light receiving transistor with the light emitting section when the switch is pressed; and each of the light receiving transistors. means for detecting a pattern of light received from the light emitting part of the pen from the instantaneous value of the counter; a recognition part for recognizing the pattern; and a standardized bit pattern of the character recognized by the recognition part by the light emitting diode on the interface surface. and means for displaying the handwritten characters as visible characters or figures.

(Structure and operation of the invention) FIG. 2 is a block diagram showing an embodiment of the present invention, in which 7 indicates a structure in which light emitting diodes and light receiving transistors are alternately and densely arranged on one plane with the light emitting surface and the light receiving surface facing upward. 8 is a counter (hereinafter referred to as X-C) 9 for selecting a line in the X direction of the interface surface 7;
is a decoder driver (hereinafter referred to as X-D) that decodes the output of (X-C) 8 and drives a predetermined X-ray; 10 is a line selection counter in the Y direction (hereinafter referred to as
-C), 11 is a decoder driver for driving the light emitting diode in the Y direction (hereinafter referred to as Y-D), and 12 is a light receiving circuit for receiving the signal from the light receiving transistor in the Y direction (hereinafter referred to as Y-S). 13 is a pen that has a light emitting part and a switch at the tip, and 14 is a pen that receives light from the pen 13 via the interface surface 7 while the switch signal from the pen 13 is input. A sample circuit samples the values of X-C8, Y-C10, 15 is a font memory having character information in the form of dots, 16 is the X, Y information of the dot pattern of font memory 15 and X-C8, Y-C1
It is constructed like a matching circuit that checks for a match with a value of 0. The printing section 6 shown in FIG. 1 has the same function in FIG. 2 as well. Further, in FIG. 1, the control section 4 simply transfers or edits data, and since it has little relevance to the present invention, a description thereof will be omitted.

Here, details of the interface surface 7 are shown in FIG. Figure 3 shows 7200 pairs of light emitting diodes and light receiving transistors arranged in a one-to-one ratio.As shown in Figure 3, 120 pairs are arranged in the X direction, and 120 pairs are arranged in the Y direction.
There are 60 sets arranged. The anode of the light emitting diode and the collector of the light receiving transistor are interconnected to the X-ray, led out from X-1 to X-120, and connected one-to-one to X-D9 in FIG. Further, the cathode side of the light emitting diode is interconnected to the Y line, led out from the line Y-1 to Y-60, and connected one-to-one to Y-D11 in FIG. 2. Also X-D9
A current is drawn to the line selected by Y-D
Since current flows into the line selected by 11 and arranged on the matrix, only the light emitting diode at one point on the matrix selected by X-D9 and Y-D11 can emit light at a certain point in time. Next, the emitter of the photodetector transistor is led out to the same YS-60, and Y-
It is connected one-to-one to S12.

Below, this device will be explained in more detail in terms of functionality. X
Y-C10 is configured to count 60 while -C8 counts 1. Detection of light by the light receiving transistor is performed by the X-C8, Y-C1
This is done in a scanning manner using a zero counter. When the pen 13 is placed on the upper surface of the interface surface 7, a switch at the tip of the pen 13 is turned on, notifying the sample circuit 14 that characters are being input on the interface surface 7. Furthermore, the light emitted from the light emitting part of the pen 13 is directed to the interface surface 7.
X-C8,Y when the light-receiving transistor receives light
The value of -C10 is sampled into the sample circuit 14. Therefore, when a character is written on the interface surface 7, the locus (pattern) of the character is sampled by the sample circuit 14 from time to time, and the type of the character is recognized by the recognition unit 3. now,
To explain a case where the interface surface 7, which is made up of 7200 pairs of light emitting diodes and light receiving transistors, performs input and output for two characters, for example, when inputting the characters "handwritten character recognition", After inputting the character "hand" on the left half, when the user places the pen 13 on the right half of the interface surface 7 to input the character "calligraphy" on the right half of the interface surface 7, The input to the left half of the interface surface 7 is considered completed. Here, the fact that the pen 13 is placed in the right half area is determined by the sample circuit 14 sampling the count value of X-C8 which received light from the light emitting section of the pen 13. The sampling circuit 14 determines that the pen 13 is placed in the right half area if the count value of X-C8 at the time of sampling is, for example, "61" or more. A signal indicating whether the pen 13 is located in the left or right area is supplied from the sample circuit 14 to the matching circuit 16. Based on this signal, the matching circuit 16 knows which area to place the light emitting point in accordance with the dot pattern to be displayed. When the pen 13 is placed in the right half area, it is displayed in the left area, and when it is placed in the left half area, it is displayed in the right area. In the case of right area display, the position of the light emitting point of the dot pattern is, for example, in the X direction (horizontal direction).
Assuming that 120 light emitting diodes are arranged, shift 60 columns to the right from the left area. This shift in the light emission position is controlled by the coincidence circuit 16 using the above-mentioned signal received from the sample circuit 14 and the count value of X-C8.

The character "hand" input into the above-mentioned left half area with the pen 13 is sent to the recognition unit 3. The recognition unit 3 recognizes the character "hand" and transmits the information to the font memory 15. Font memory 1
5 outputs a dot pattern corresponding to the character "hand", and the matching circuit 16 checks the coincidence between the position of the dot pattern and the data of X-C8 and Y-C10, and if they match, that is, the character "hand" When X-C8 and Y-C10 indicate the point corresponding to the display position of the dot pattern, X-D9, Y-D11
The light emitting diode corresponding to the position of the dot pattern of the character "hand" is driven. In this way, a standardized pattern of the characters "hand" is displayed in the left half area of the interface surface 7.

In the same manner, by starting to write the character ``bun'' on the left side of the interface surface 7, a dot pattern corresponding to the character ``sho'' that has already been written is output on the right side of the interface surface 7. ,
By erasing the dot pattern corresponding to the character "hand" on the left side of the interface surface 7,
It is used as an input section and an output section one after another.

As explained above, in the above embodiment, the interface surface 7 can be used not only as an input tablet and a pen 13 equipped with a light emitting section and a switch at the tip, but also as a display section for outputting recognition results. That is, it can be used as a character input section by scanning the light-receiving transistor, and it can also be used as a display section by pulse-lighting the dot pattern resulting from the recognition. Conventionally, input and output were performed using separate devices, which made it difficult to operate and made it impossible to increase the speed of operation. has the advantage of being able to input data while checking whether it has been entered correctly, and as a result of the improved operability, the operating speed also improves.

Next, in FIG. 2, the interface surface 7 and its peripheral circuits X-C8, X-D9, Y-C1
0, Y-D11, Y-S12, matching circuit 16, etc. have been explained as separate units because they are functionally different, but they are easy to manufacture as one LSI, and can be easily manufactured as one LSI. When configured as an LSI, the number of connection points is greatly reduced, making it cheaper and smaller.

In the explanation of the above embodiment, when input ends on the left side of the character frame for two characters and input begins on the right side, the dot pattern of the recognition result of the character input on the left side is displayed on the left side of the interface surface 7. death,
In the explanation, the dot pattern of the recognized character is displayed after inputting one character after another, but in addition to displaying the dot pattern of the recognized character using the font memory 15, the trajectory of the character or symbol being input is also displayed. It is also possible to display directly. By directly displaying the trajectory of the characters or symbols being input, the scribe can be aware of the form in which the characters or symbols he or she has input into the online handwritten character recognition device. If the scribe's writing habits are recognized, the scribe's writing habits will be clearly fed back to the scribe himself/herself, which will also have the effect of promoting the scribe's learning effect.

Next, in the embodiment described above, the pen 13 has a light emitting part and a switch at the tip, and when the pen 13 is placed on the interface surface, the switch is turned on and the signal is transmitted to the sample circuit 14. It is not necessarily necessary to send information that the switch has been turned on from 13 to the sample circuit, and even if the light emitting part of the pen 13 is made to emit light when the switch is turned on, stroke information for the online handwritten character recognition device can still be obtained. It is something that can be done.
That is, when the pen 13 is not on the interface surface 7, the switch at the tip of the pen 13 is off and does not emit light, so no light is received by the light receiving transistor, and the pen 13 is not on the interface surface 7. Since the switch is on only when the pen 13 is in the upper position, the light emitting part at the tip of the pen 13 emits light, which is sensed by the light receiving transistor, so there is no need to send switch information directly to the sample circuit 14.

Furthermore, it goes without saying that the light serving as the medium for the light-receiving transistor on the interface surface 7 and the light-emitting portion at the tip of the pen 13 in the embodiment described above does not need to be visible light. For example, infrared radiation can be used.

Furthermore, the present invention includes a light-receiving transistor as an input sensor and a light-emitting diode as a display element, so input and display can be performed simultaneously. Therefore, the scanning time per light-receiving transistor and light-emitting diode can be made sufficiently long. This scanning time is particularly short on an interface surface with a multi-character frame, so the fact that the unit scanning time is long enough means that the screen is displayed with sufficient light intensity.
This advantage can be said to be important because it means that stable input is possible.

(Effects of the Invention) As described above in detail, according to the present invention, the input section and the display section can be constructed from one member, which is inexpensive, and
Input operations and confirmation are easier, reducing fatigue.
There are various advantages such as improved input speed.

[Brief explanation of the drawing]

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, and FIG. 3 is a detailed view of the interface surface 7. 1... Tablet, 2... Pen, 3... Recognition section, 4... Control section, 5... Display section, 6... Printing section, 7... Interface surface, 8... X-ray selection counter, 9 ...X-ray decoder driver, 10...
... Y-line selection counter, 11 ... Y-line decoder driver, 12 ... Y-line light receiving circuit, 13 ... Pen with a light emitting part and switch at the tip, 14 ... Sample circuit, 15 ... Font memory, 16 ... matching circuit.

Claims (1)

[Claims] 1 At least two cells each consisting of a light emitting diode and a light receiving transistor are arranged in a matrix.
The interface surface that constitutes the above character frame,
a counter and drive circuit that scans the cells and sequentially selects and drives them; a pen that has a switch and a light emitting section at its tip and illuminates the light receiving transistor with the light emitting section when the switch is pressed; and each of the light receiving transistors. means for detecting a pattern of light received from the light emitting section of the pen from the instantaneous value of the counter, a recognition section for recognizing the pattern, and a standardized bit pattern of the character recognized by the recognition section on the light emitting diode on the interface surface. 1. An online handwritten character recognition device comprising: means for displaying visible characters or figures.