JPS62123579A - Character recognizing device - Google Patents

Abstract

PURPOSE:To obtain a character recognizing device which does not need the special training and is good in operability by correcting a displayed wrong answer character through a tablet part and a displaying converting part and executing the character recognizing processing to the character pattern again. CONSTITUTION:When the character pattern if the recognizing failure is corrected, a tablet input part 11 places the written point of a tablet pen 34 at the correcting position of the erroneous character displayed at a liquid crystal panel 35 and corrects the pattern. At the time of completion, when the written point is placed at a completion informing area, a character writing completing signal A is generated. The corrected character pattern is accommodated into a correcting pattern memory 13. An input changing-over part 3 writes the character pattern from the memory 13 to the same pattern address that before correcting. A pattern register 4 obtains the OR of the pattern before and after the correcting and accommodates it. When the signal A is generated, a characteristic extracting part 4 extracts the characteristic of the correcting pattern and an identifying part 6 executes the recognizing result from the identifying part 6, the part outputs this to a character name output 15 and outputs the changing- over signal to the changing-over part 3.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a character recognition device that is small in size and easy to operate.

(Prior art) In conventional optical single character recognition equipment, especially equipment that recognizes Chinese characters, when reading is impossible or when multiple candidates are listed as a reading result, the correct character does not exist among the candidate characters. The problem is how to input the correct characters for time etc. As shown in Figure 6, which shows an example of the cause of failure in recognition, the pattern to be read at the time of unreadability is "faint", "
Since it is "KIRERE", there are similar characters and misspellings for the object to be read, and therefore there is no correct character.

There! , it is necessary to input the correct character only for that character, but the first input method is to convert the input from the kana keyboard into kana-kanji and input it. A second method is to have an input section such as a kanji tablet in which all the characters to be read are arranged.

(Problems to be Solved by the Invention) However, the first method requires skill on the part of the operator for input operations, and the second method requires the same skill as the first method, and also requires input speed. The disadvantage was that it was slow.

The present invention is intended to solve these problems, and it is an object of the present invention to provide a character recognition device that is small and easy to operate without requiring special training for the operator.

(Means for Solving the Problems) In order to solve the above problems, the present invention converts electrical signals obtained by photoelectrically converting printed or handwritten character figures on a form into two
The digital signal quantized to a value is stored in a pattern register, features are extracted by a feature extractor from the character/figure pattern in the pattern register, characters are recognized by comparing the extracted features with a dictionary, and the recognition result is Correct letter or.

The present invention is characterized in that a 5-order tablet section and a display conversion section are provided in a character recognition device that displays incorrect characters and candidate characters as a result of recognition on a display section.

The tablet section is a position instruction input section having two-dimensional coordinates corresponding to the two-dimensional coordinates of the display surface of the display section. The display conversion section is for converting the position information input to the tablet section into a signal to be displayed on the display section.

(Function) According to the present invention having the above-described configuration, the feature extraction section extracts features from the read character/figure pattern, and the resulting characters are recognized by comparing the features with a dictionary. When it is a correct character and there is no correct character among all the candidate characters, the position information entered using the two-dimensional coordinates of the tablet unit is corrected via the display conversion unit for the incorrect character displayed on the display unit. Add. Then, the modified character/graphic pattern is again subjected to character recognition processing, that is, processing in which the features extracted by the feature extraction section are checked against a dictionary to perform character recognition.

Therefore, the present invention can solve the above-mentioned problems, and can provide a character recognition device that is small and easy to operate without requiring special training for the operator.

(Example) Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

First, the present embodiment will be explained with reference to a normal character recognition operation, and then a character recognition operation based on tablet input.

The operator sets the document to be read in the reading mechanism section 1O and presses the reading start key on the keyboard section 8. The keyboard unit 8 detects the depression of the reading start key and sends a reading start signal to the control unit 7. When the control section 7 receives the reading start signal, it transmits a reading start command signal to the reading mechanism section 10. When the reading mechanism section 10 receives the reading start command signal, it starts sucking the document to be read into the reading mechanism. Characters and figures printed or handwritten on a form are input to a photoelectric conversion section 2 as an optical input signal 1, converted into a binary digital electrical signal, and sent to an input switching section 3. The input switching unit 3 performs an operation of switching between a signal from the photoelectric conversion unit 2 and a signal from a correction pattern memory 13 (described later) in response to an input switching signal from the control unit 7. In the normal case, character recognition is performed by tablet input. Otherwise, the signal from the photoelectric conversion section 2 is stored in the pattern register 4. The feature extractor 5 extracts various features from the character/figure patterns stored in the pattern register 4 and sends the extracted features to the identifier 6.

The identification unit 6 determines a character name by comparing the extracted features with a dictionary prepared in advance, and sends the determined character name to the control unit 7. However, when the character name cannot be determined uniquely in the identification section 6, that is, when there are multiple candidate character names, the plurality of candidate character names are sent to the control section 7, and when it is unreadable, that is, only one candidate character name exists. If neither is obtained, an unreadable signal is sent to the control section 7. When the control unit 7 receives one character name from the identification unit 6, it outputs the character name to the character name output 15. When the control unit 7 receives a plurality of candidate character names or an unreadable signal from the identification unit 6, it sends the character/figure pattern stored in the pattern register 4 to the pattern display unit 14, and indicates that there are multiple candidate character names. If so, the plural candidate character names are sent to the display unit 9.

The display unit 9 displays the received character pattern and candidate characters, if any, on the display. The operator looks at the character pattern displayed on the pattern display section 14 and the candidate characters displayed on the display section 9 and inputs the correct character. Since the operation of inputting the correct character is performed in a conventional character recognition device, the explanation here will be omitted, and the input method using the tablet input section 11 and pattern display section 14, which is a feature of the present invention, will be explained below. .

As shown in FIG. 2, the two-dimensional plane of the tablet of the tablet input unit 11 of the present invention is divided into three areas: a character writing area 219 for writing one character, a character writing start notification area 222, and a character writing end notification area 23. has been done.

The tablet input unit 11 detects the two-dimensional coordinates of the writing point placed on the tablet surface 1-8, and when it detects that the writing point is in the character writing start notification area, it sends a character writing start signal to the control unit 7.
and sends it to the modified pattern memory input section 12. Similarly, when a writing point exists in the character writing area, the two-dimensional coordinate data of the writing point is sent to the correction pattern memory input section 12. The operator first places a pen point on the character entry start notification area 22.

As described above, the tablet input section 11 sends a character entry start signal to the control section 7 and the correction pattern memory input section 12, and upon receiving the character entry start signal, the control section 7 sends a signal from the correction pattern memory 13 to the input switching section 3. The operator sends a switching signal to send the pattern data to the pattern register 4, waits for the character name to be output from the identification section 6, then writes the character to be input in the character entry area 21,
After completing the entry -r, place a pen point in the character entry completion notification area 23. The tablet input unit 11 detects the two-dimensional coordinates of a writing point placed in the character entry area 21 and sends the two-dimensional coordinate data of the writing point to the correction pattern memory input unit 12. Further, when the tablet input section 11 detects that the pen point is placed in the character writing end notification area 23, it sends a one-character writing end signal to the control section 7. The correction pattern memory input unit 12 stores data indicating a character line portion at a point in the correction pattern memory 13 corresponding to the two-dimensional coordinates of the writing point received from the tablet unit 11. Further, this data is displayed on the pattern display section 14 via the control section 7. In this embodiment, the character line part is set to "1", the character background part is set to °O', and when the correction pattern memory input section 12 receives the character entry start signal from the tablet input section 11, all the characters are stored in the correction pattern memory 13. Stores °°0°゛.

Next, FIG. 3 is a diagram showing the respective configurations of the tablet blade section and pattern display section in this embodiment.

In the figure, 31 is a tablet, 32 is a tablet/
) A control section, 33 is a tablet signal, and 34 is a tablet bezel, and these are the elements constituting the tablet input section. Further, 35 is a liquid crystal panel, 36 is a liquid crystal panel control section, and 37 is character/graphic pattern data, and these are the elements constituting the pattern display section. In the tablet input section, the two-dimensional coordinate data entered in the character entry area 21 of FIG. Correction pattern memory input section 1
Output to 2. The character/figure pattern data 37 from the control section 7 is sent to the liquid crystal panel 35 via the liquid crystal panel control section 26.
, and the data is displayed on the liquid crystal panel 35 at the same position as the tablet Ben 34. Since the tablet 31 is transparent so that the display on the liquid crystal panel 35 located below can be seen, the data entered on the tablet 31 using the tablet ben 34 is displayed on the liquid crystal panel 35.
The operator can view the data through the tablet 31.

Next, a description will be given of the operation of correcting a character/graphic pattern that is unsuccessfully recognized using such a tablet input section and pattern display section.

Here, Figure 54 (a) is a character/figure pattern that was unsuccessfully recognized due to a typo, and this character/figure pattern is displayed on the liquid crystal panel 35 in Figure 3 at the time the unreadable signal is issued. . Then, using the tablet ben 34 of the tablet input section in Fig. 3, the character/figure pattern in Fig. 4(a) is corrected by adding one horizontal bar because it is missing one horizontal bar. Shown in b). As a specific operation, first, place the writing point of the tablet pen 34 on the character entry start area 21, and then, as shown in FIG. A pen point is placed at a position of a horizontal bar that does not exist, and the pattern is corrected.The corrected portion is displayed on the liquid crystal panel 35 every time the coordinates of the pen point on the tablet ben 34 are detected. When the correction is completed, if you place the writing point of the tablet ben 34 on the character entry completion notification area 23 of the tablet 31,
A character entry end signal is issued. The modified character/figure pattern is then stored in the modified pattern memory input section 12 of FIG.
The pattern is stored in the temporary correction pattern memory 13 via the. Thereafter, the input switching section 3 writes the character/graphic pattern received from the modified pattern memory 13 into the pattern register 4 at the same pattern address as the character/graphic pattern before modification. In this method of writing to the pattern register 4, first, the modified pattern memory 13 is scanned, and the pattern data in the modified pattern memory 13 is sent to the pattern register 4 via the input switching section 3. In the pattern register 4, the corrected character/graphic pattern in the modified pattern memory 13 and the unsuccessfully recognized character/graphic pattern are logically ORed and stored. When a character entry end signal is sent from the tablet input section, the feature extraction section 4 extracts the features of the modified pattern stored in the pattern register 4, and the identification section 6 performs identification.

Thereafter, the control section 7 waits for the recognition result for the character/figure pattern modified by the tablet input section 11 to be outputted from the recognition section 6 as described above, and upon receiving the recognition result from the recognition section 6, the character name Yamariki 15 is outputted from the recognition section 6. Output the results to, and
A switching signal for sending data from the photoelectric conversion section 2 to the pattern register 4 is sent to the input switching section 3.

In addition, although the character/figure pattern modified by the tablet input section and pattern display section was displayed on the display section as described above,
As shown in Figure 5, the pattern display section and the display section have the same CR.
The T-display 51 can also be used to display character/graphic patterns that have not been successfully recognized in the character entry area 52.

The modification in this method is performed using the light ben 53, and the rest is the same as in the above embodiment. According to this method, an even smaller system can be constructed.

(Effects of the Invention) As explained below, according to the present invention, "cut", "
This is a small and easy-to-operate character recognition device that does not require special operator training because it can immediately and easily correct deficiencies in character/figure patterns such as "fainted characters" or typographical errors - similar character patterns. can be provided.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a diagram showing the area of the tablet surface of this embodiment, and FIG. 3 is a diagram showing the tablet input section and pattern display section of this embodiment. A configuration diagram, FIG. 4 is a transition diagram of correction processing in this embodiment,
FIG. 5 is a block diagram showing another embodiment of the present invention, and FIG. 6 is a diagram showing an example of the cause of recognition failure. l... Optical signal input, 2... Photoelectric conversion section, 3...
・Input exchange section, 4...Pattern register, 5.
...Feature extraction section, 6.Identification section, 7.Control section, 8.Keyboard section, 9.Display section,
IO... Reading mechanism section, 11... Tablet human power section, 12... Correction pattern memory input section, 13... Correction pattern memory, 14... Pattern display section, 15...
・Character name output, 21.52...Character entry area, 2
2... Character entry start notification area, 23... Character entry end notification area, 31... Tablet, 32... Tablet control unit, 33... Tablet signal, 34... Tablet Ben, 35... ...Liquid crystal panel, 36...Liquid crystal panel control unit, 37...Character/figure pattern data, 51...CRT display, 53...Light pen.

Claims (1)

[Claims] Digital signals obtained by photoelectrically converting printed or handwritten character figures on a form and quantized into binary values are stored in a pattern register, and features are extracted from the character figure patterns in the pattern register. In the character recognition device, the character recognition device extracts features by a unit, recognizes characters by comparing the extracted features with a dictionary, and displays correct characters as a recognition result or incorrect characters as a result of the recognition and candidate characters on a display unit, A tablet section having two-dimensional coordinates corresponding to the two-dimensional coordinates of a display surface of the display section, and a display conversion section that converts position information input to the tablet section into a signal for displaying on the display section. , When a character in the recognition result is an incorrect character and there is no correct character among all candidate characters, the incorrect character displayed on the display section is corrected via the tablet section and the display conversion section. A character recognition device characterized in that the character recognition process is performed again on the modified character/figure pattern.