JPH04322389A - Online hand-written character recognition device - Google Patents

Abstract

PURPOSE:To increase the hand-written character input speed by providing a manual switch to improve the operability of hand-written character input. CONSTITUTION:Hand-written characters written in a hand-written character input part 1 are compared with contents of a character recognition dictionary 2, where features of hand-written characters are preliminarily registered, and are discriminated by a character discriminating part 3. A command to change the hand-written character input mode is outputted from a manual switch part 5. A mode discriminating means 6 discriminates he hand-written character input mode. Band-written characters and the processing result of a mode execution part 7 are displayed on a display part 4.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an online handwritten character recognition device.

0002

2. Description of the Related Art In a conventional online handwritten character recognition device, there is a mode other than the character recognition mode in which character proofreading is performed using handwritten characters. For example, when deleting a displayed character, there is a method of tracing the character to be deleted with a horizontal line, and all of these methods are treated as equivalent to character recognition mode and input handwritten characters.

0003

[Problem to be Solved by the Invention] However, in the conventional character proofing means using handwritten characters, if the input horizontal line is short, it is difficult to determine whether it is a minus "-" in a mathematical formula or "-" in a kanji character.
, or whether it is a horizontal line for deleting the desired character, the method for determining whether it is a horizontal line for deleting the desired character is ambiguous, so the character inputter cannot perform the desired process in one operation, and only after retrying several times. There is a problem that the handwritten character input is troublesome and the operability of inputting handwritten characters is decreased, resulting in a decrease in character input speed.

0004

[Means for Solving the Problems] The online handwritten character recognition device of the present invention, as shown in the functional block diagram of FIG.
a handwritten character input section 1 for inputting handwritten characters; a character recognition dictionary 2 in which features of the handwritten characters are registered in advance; a character identification section 3 for comparing the handwritten characters with the character recognition dictionary 2 and identifying the characters; a display section 4 that displays characters identified by the identification section 3; a manual switch section 5 that changes the handwritten character input mode; and a mode identification section 6 that determines the mode based on commands from the manual switch section 5. and a mode execution section 7 for executing the mode selected by the mode identification means 6, and a character recognition section 8 comprising the character identification section 3, the character recognition dictionary 2, and the mode identification means 6. It is characterized by

[0005]

Embodiments (Embodiment 1) Details of the online handwritten character recognition apparatus of the present invention will be explained below based on an illustrated embodiment.

FIG. 2 is a block diagram showing an embodiment of the present invention. In the figure, 401 is a touch switch for performing a mode other than character recognition, 402 is a transparent tablet for inputting handwritten characters, and 403 is a liquid crystal display unit that displays character recognition results or execution results of modes other than character recognition. It is placed under a transparent tablet 402 and has an integrated structure. 404 is a pen for inputting handwritten characters. 41
A latch circuit 3 latches the state when the touch switch 401 is turned on (pressed).

The part surrounded by a broken line is a character recognition section 408, which includes a character recognition section 405, a character recognition dictionary 406, and a mode identification means 407 for identifying whether the mode is character recognition mode or another mode using a touch switch 401. It consists of

Reference numeral 409 is a mode execution unit that executes modes other than character recognition.

[0009] 410 is a CPU, 411 is a ROM, 41
2 is a RAM. The ROM 411 stores programs for controlling the online handwritten character recognition device, such as the mode identification means 407 and the character recognition dictionary 406.

Next, the operation of the apparatus configured as described above will be explained based on the configuration diagram shown in FIG.

When the touch switch 401 is turned OFF (not pressed), the character recognition unit 408 functions as a character recognition function, and when the touch switch 401 is turned ON (pressed) to enter a mode other than character recognition, the character recognition section 408 works as a character recognition function. Part 40
It is set to work as a function to proofread the characters displayed in 3 and their layout.

[0012] First, the person inputting handwritten characters decides whether he or she wants to enter the character recognition mode for handwritten characters or calibrate the character layout, and then operates the touch switch 401 . When the touch switch 401 is turned on, the latch circuit 4
13 works and latches the ON state.

Next, the character inputter writes characters to be recognized on the tablet 402 using the pen 404. Then, the trajectory of the handwritten character written with the pen 404 from the tablet 402 is converted into an electrical signal, and the character recognition unit 405 in the character recognition unit 408 converts it into an electrical signal as coordinate data on the tablet 402.
sent to.

[0014] When performing character layout proofreading, use pen 4.
04, press the touch switch 401 with the hand that does not hold the pen 404 and add special characters that have the desired proofreading function to the characters you want to proofread by handwriting, and proofread the text displayed on the liquid crystal display 403. Determine the position of the character. Here, the special characters are symbols that are not used as characters in normal character recognition to indicate insertion, deletion, copying, etc. of characters, and an example thereof is shown in FIG. In Figure 3, (a) is a symbol for inserting characters or sentences between characters, (b) is a symbol for copying characters surrounded by curved lines to another location, and (c) is a symbol for copying characters surrounded by curved lines to another location. This is a symbol for deleting the part traced with a horizontal line. In either case, it will not be effective unless the touch switch 401 is turned on. Furthermore, the function of these special characters can be changed by the character inputter, and it is also possible to add unique special characters as new functions. Characters deleted using the delete function or copied using the copy function are RA.
Since it is saved in M412, it can be called using special characters such as insert.

[0015] In the character recognition section 405, the tablet 402
The coordinate data of the handwritten characters sent from the CPU 41
0 as a buffer in the RAM 412. Next, the coordinate data in the RAM 412 and the data in the character recognition dictionary 406 are compared to select characters that match each other. Then, the handwritten input character is specified, and the specified character is passed to the mode identification means 407 as a recognition result.

Then, the mode identifying means 407 is executed according to the flowchart shown in FIG. First step 50
1, it is checked whether data has been input from the tablet 402 and whether handwritten characters have been input. If no handwritten characters are input, step 501 is repeated. If handwritten characters are input, the process advances to step 502.
The state of the latch circuit 413 that latches the state of the touch switch 401 when handwritten characters are written on the tablet 402 is read, and the data is transferred to the RAM 412. The process then proceeds to step 503, where the latch circuit 413 is reset to return to its initial state. Next, the process advances to step 504, where the character recognition unit 405 reads a register indicating whether character recognition processing has been completed. and step 5
If the character recognition unit 405 determines in step 05 that the character recognition process has been completed, the process advances to step 506. If it is determined that the character recognition process has not been completed, the process returns to step 504 and repeats this process. In step 506, the character identification section 405
Check to see if character recognition has completed successfully. If the process has ended normally, the process advances to step 507. If the character recognition ends abnormally, that is, if the handwritten character cannot be recognized by the character recognition unit 405, the process advances to step 509, and the content of the error is set. Then, in step 510, the error content data is transferred to the liquid crystal display section 403, and the process ends. In step 507, it is checked whether the state of the touch switch 401 transferred to the RAM 412 in step 502 is ON. If we judge that it is ON here,
Since the function of the currently input handwritten character is a function to proofread the layout of the displayed character, step 508
The process advances to step 405, where the character data recognized by the character identification unit 405 is transferred to the mode execution unit 409, and the process ends. If it is determined that it is OFF, since the currently input handwritten character function is for character recognition, the data of the handwritten character recognized by the character recognition unit 405 is transferred to the liquid crystal display unit 403 and the process ends.

When the mode identification means 407 determines that the function is to proofread the character layout, the mode execution section 4
Proceed to 09.

The mode execution unit 409 determines which of the character layout functions the function of the handwritten input special character applies to, and executes that function. An example of special characters is shown in FIG. 3, and a proofreading method using them will be explained using the example of FIG. FIG. 4 shows the process of editing the sentence "online character recognition" from the two sentences "character recognition" and "online character recognition". First, while pressing the touch switch 401, the duplicate word "online" is deleted from the second example sentence "online character recognition" using a deletion symbol. Next, RA the word “recognition” in example sentence 1 using the copy symbol while pressing the touch switch 401.
Save in M412. Finally, call up the word saved in the RAM 412 with the insertion symbol while pressing the touch switch 401, and select "Recognize" after "Online Character".
Insert the word and finish editing. The character data calibrated in this way is sent to the liquid crystal display section 403.

The liquid crystal display section 403 converts the sent character data into characters and displays them. In the above embodiments, switching between character recognition and other modes has been explained, but the present invention can also be used for switching character types.

[0020]

[Effects of the Invention] As explained above, according to the present invention, the means for determining the input mode, which was a problem in conventional handwritten character input, is equivalent to the character recognition mode. By installing a character recognition mode switch on the main body of the device, we have improved the operability when inputting handwritten characters. As a result, the speed of handwritten character input was improved, which made it easy to solve the problem.

[Brief explanation of drawings]

FIG. 1 is a functional block diagram showing the configuration of an online handwritten character recognition device of the present invention.

FIG. 2 is a configuration diagram showing an embodiment of the present invention.

FIG. 3 is a diagram showing examples of special characters of the character layout function of the present invention.

FIG. 4 is a diagram showing the process of character proofreading using the character layout function of the present invention.

FIG. 5 is a diagram showing an algorithm rhythm in the mode identification means of the present invention.

[Explanation of symbols]

1 Handwritten character input section 2 Character recognition dictionary 3 Character identification section 4 Display section 5 Manual switch section 6 Mode identification means 7 Mode execution part 8 Character recognition section 401 Touch switch 402 Tablet 403 Liquid crystal display section 404 Pen 405 Character identification section 406 Character recognition dictionary 407 Mode identification means 408 Character recognition section 409 Mode execution part 410 CPU 411 ROM 412 RAM 413 Latch circuit

Claims (1)

[Claims] 1. A handwritten character input section for inputting handwritten characters; a character recognition dictionary in which features of the handwritten characters are registered in advance; a character identification section for comparing the handwritten characters with the character recognition dictionary; a display unit that displays characters identified by the character recognition unit; a manual switch unit that changes the handwritten character input mode; a mode identification unit that determines the mode based on a command from the manual switch unit; An online handwritten character recognition device comprising: a mode execution unit that executes a mode selected by an identification unit; and a character recognition unit that includes the character identification unit, the character recognition dictionary, and the mode identification unit. .