JP2922512B2 - Character recognition device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a character recognition device that recognizes and inputs handwritten characters. [Related Art] In conventional handwritten character recognition, as shown in FIG. 5, a handwritten character is read and converted into a binary pattern, and the length, angle, position, stroke, and stroke of the character are converted from the binary pattern by a feature extraction unit. Is extracted and represented by a multidimensional vector. The multidimensional vector is subjected to similar processing in advance, and compared with a character feature (bechlor), which is a recognition reference from which the feature has been extracted, and 10 to 100 types of candidate characters are selected. This candidate character was determined by narrowing down to a more precise matching one character type. [Problems to be Solved by the Invention] However, in the above-described conventional column, a dictionary for reference is configured based on standard character data. , Misrecognition is likely to occur. In order to solve this problem, the shape of the character to be written to the operator is limited, and if the character is erroneously recognized, input the correct character from a keyboard or the like, or display the candidate character and provide the operator with a character. Although a method such as selection was used, there was a drawback that it was uncomfortable to use. Also, in the method of having a dictionary expressing characteristics for each operator, it is difficult to create a dictionary, and if it is not a device dedicated to an individual, it becomes difficult to use it. Having a dictionary for use requires a large amount of memory and the like, and has the disadvantage of high cost. The present invention has been made in view of the above conventional example, and provides a character recognition device capable of changing a character recognition dictionary to a dictionary suitable for a user without increasing handwritten information or pattern information stored in the dictionary. The purpose is to: [Means for Solving the Problems] To achieve the above object, the character recognition device of the present invention has the following configuration. Input means for inputting handwritten information; storage means for storing a dictionary in which handwritten information and character information are associated; recognition candidates corresponding to the handwritten information input from the input means with reference to the dictionary; Recognition means for selecting a character, correction information input means for inputting correction information for the recognition candidate character selected by the recognition means, and correction information input by the correction information input means, stored in the dictionary. Dictionary changing means for changing the recognition candidate character. Also, the present invention provides an input unit for inputting pattern information, a storage unit for storing a dictionary in which pattern information and character information are associated with each other, a pattern information stored in the dictionary and a pattern input by the input unit. A recognition unit that compares character information and selects character information stored in association with pattern information determined to be similar; and correction information for inputting correction information for the character information selected by the recognition unit. An input unit; and a dictionary changing unit that changes the selected character information stored in the storage unit based on the correction information input by the correction information input unit. [Operation] With the above configuration, handwritten information or pattern information is input, a dictionary is referred to, and recognition candidate characters corresponding to the input handwritten information or pattern information are selected. When the correction information is input, it operates to change the recognition candidate character stored in the dictionary according to the input correction information. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. [Description of Handwritten Character Recognition Apparatus (FIG. 1)] FIG. 1 is a diagram showing a schematic configuration of a handwritten character recognition apparatus according to the embodiment. In the figure, reference numeral 1 denotes a central processing unit (CPU) that controls the entire apparatus and performs character recognition and the like in accordance with a control program in a program memory 2. The program memory 2 stores control programs, data, and the like shown in the flowchart of FIG. Reference numeral 3 is used as a work area of the CPU 1 and stores document information including recognized character information and the like.
RAM. Reference numeral 5 denotes a handwritten character input unit for inputting handwritten characters, which is constituted by, for example, a digitizer or the like, and by writing with a pen 11 on a tablet, its coordinate value is output.
Is input to The CPU 1 performs character recognition by calculating the stroke length, angle, position, and the like of the character based on the coordinate values. 6
Is a recognition dictionary with feature data of reference characters.
The CPU 1 compares the characteristic data of the handwritten character input from the handwritten character input unit 5 with the characteristic data of the recognition dictionary 6, and performs character recognition and selection of candidate characters. Reference numeral 7 denotes a keyboard for inputting document information and various instructions.
It has a correction key 12, various character keys, function keys, and the like.
A display unit 8 displays a recognition result, document information in the RAM 3, and the like. Reference numeral 9 denotes a detachable external memory, which is rewritable and non-volatile, and is connected to the apparatus main body by a connection unit 10. As will be described later, the external memory 9 stores characteristic data of handwritten characters for each operator or each individual, and each individual operator owns his or her own memory 9. Therefore,
The operator converts the external memory 9 into his / her own memory and then inputs a handwritten character. Reference numeral 13 denotes a timer that measures time according to an instruction from the CPU 1. [Explanation of Information Processing (FIG. 2)] FIG. 2 is a flowchart of the recognition processing section program of the embodiment stored in the program memory 2. First, in step S1, handwritten coordinate values are input from the handwritten character input unit 5. In step S2, character feature information is obtained based on the coordinate values input by handwriting from a handwritten character input unit 5 such as a digitizer, and character recognition is performed with reference to a recognition dictionary 6 to determine a plurality of candidate characters. select. The recognition dictionary 6 stores a plurality of recognition patterns for one type of character, and the recognition program stored in the program memory 2 refers to the recognition dictionary 6 and performs steps.
For example, four candidates are selected in order from the pattern determined to be closest to the character input in S1. Assume that four candidate characters are I, B, C, and D in the order of priority, where A is the second of the patterns representing the character "D" (hereinafter represented by D-2), and B is the character " P "(hereinafter referred to as P-1)
Similarly, C is P-3 and D is D-1. In step S3, a check is made to see if any of the four candidate characters found in step S2 exists in the external memory 9. If not, proceed to step S5 and select the most probable candidate character (here a)
Is selected and displayed as a recognized character in step S6. On the other hand, if there is a pattern corresponding to the candidate character in the external memory 9 as shown in FIG. 3, the process proceeds to step S4,
The character is determined with reference to the external memory 9 and displayed as a recognized character in step S6. For example, in the case of the external memory 9 in FIG. 3, the patterns (D-2) and (P-3)
However, since the character A has a higher priority, the character 34 "P" corresponding to 33 (D-2) is determined. In step S7, the timer 13 is reset, and in step S8, it is checked whether the correction key 12 of the keyboard 7 is input. If there is no input of the correction key 12, the process proceeds to step S9 to check whether the next handwritten character is input. If there is no input of the next handwritten character, the process proceeds to step S10, and the timer 13 is checked to see if one second has elapsed. If one second has not elapsed, the process returns to step S8, and the above-described operation is performed. If there is a next handwritten character input in step S9, the flow advances to step S11 to perform an input process of the next handwritten character. When the correction key 12 is input in step S8, step S12
And waits for the character (correction character) input by the operator to be input from the keyboard 7. When the correction character is input, the process proceeds to step S13, and the input correction character is stored in RAM3.
And register it as a recognized character. In step S14, it is checked whether the character input as the correction character in step S13 is included in the candidate character selected in step S2. If it is included, the flow advances to step S15 to check whether the characteristic data exists in the external memory 9, that is, in the case of the present embodiment, the pattern (D-
2, P-3). If the characteristic data is contained in the external memory 9, the process proceeds to step S17, and the corresponding area of the external memory 9 is rewritten with the corrected character. That is, for example, when the character "D" is input as the correction character in step S12, the area 34 (currently the character "P") corresponding to the most probable candidate character A (pattern D-2) in the external memory 9 is stored. )) Stores the character "D". In step S18, the finally determined character is displayed on the display unit 8.
Is displayed and the process ends. On the other hand, if the character corrected and input in step S14 is not included in the candidate characters, or if there is no characteristic data in the external memory 9 in step S15, the process proceeds to step S16, where the corrected character is displayed on the display unit 8 and the candidate character is displayed. Notifying the operator that the character is not available. With the above configuration, it is possible to perform recognition by taking into account the operator's unique cursive characters, etc., for characters input by handwriting, and to recognize characters input by handwriting by the operator in the case of erroneous recognition. The operation of associating the result with the character intended by the operator is realized. FIG. 4 is a diagram showing an example of a keyboard displayed on the display unit 8. When a correction instruction is given in step S8 of FIG. 2,
In step S12, a keyboard is displayed on the display unit 8 as shown in FIG. The operator designates a character to be input by moving the cursor 80 on the screen with the pen 11 or the like of the handwritten character input unit 5. Thereby, the correction character can be input, and in this case, the keyboard 7 becomes unnecessary. As described above, according to the present embodiment, when a character recognized by referring to the external memory is corrected, the character is registered as a pattern of the recognition dictionary in the external memory, so that the character is registered in the recognition dictionary of the external memory. Since a character or the like for each operator is stored, the recognition rate for each individual can be increased. In addition, by making the personal dictionary detachable, there is an effect that a dictionary corresponding to each individual can be created. [Effects of the Invention] As described above, according to the present invention, without increasing handwritten information or pattern information stored in a dictionary,
There is an effect that the dictionary for character recognition can be changed to a dictionary suitable for the user.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a schematic configuration of a handwritten character recognition device according to an embodiment, FIGS. 2A and 2B are flowcharts of a recognition processing program according to the embodiment, and FIG. FIG. 4 is a diagram illustrating a specific example of a memory, FIG. 4 is a diagram illustrating an example of a keyboard displayed on a display unit, and FIG. 5 is a diagram illustrating a configuration of a conventional handwritten character recognition method. In the figure, 1 ... CPU, 2 ... Program memory, 3 ... RA
M, 5: Handwritten character input unit, 6: Dictionary for recognition, 7:
... keyboard, 8 ... display, 9 ... external memory, 10 ...
.., Connection part, 11 pen, 12 correction key, 13 timer.

Claims (1)

(57) [Claims] Input means for inputting handwritten information, storage means for storing a dictionary in which handwritten information and character information are associated, and referring to the dictionary, recognize candidate characters corresponding to the handwritten information input from the input means. Recognition means for selecting, correction information input means for inputting correction information for the recognition candidate character selected by the recognition means, and the correction information stored in the dictionary by the correction information input by the correction information input means. A character recognizing device, comprising: dictionary changing means for changing candidate characters. 2. An input unit for inputting the pattern information; a storage unit for storing a dictionary in which the pattern information and the character information are associated; comparing the pattern information stored in the dictionary with the pattern information input by the input unit; A recognition unit that selects character information stored in association with pattern information determined to be similar; correction information input unit that inputs correction information for the character information selected by the recognition unit; A character recognition device, comprising: dictionary changing means for changing the selected character information stored in the storage means based on the correction information input by the correction information input means. 3. 3. The character recognition device according to claim 1, wherein the storage unit is a removable nonvolatile memory. 4. 3. The character recognition device according to claim 1, wherein the correction information input by the correction information input unit is character information stored in the dictionary.