JPH0340428B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a character recognition device that recognizes handwritten characters and displays the recognition results on a character display device.

(b) Prior art Japanese Patent Application Laid-Open No. 59-105181 discloses that a plurality of candidate characters are selected by similarity calculation, and these candidate characters are displayed on a character display device in order of recognition rank according to the press of a correction key. What is displayed is disclosed.

(C) Problems to be Solved by the Invention In the above-mentioned conventional technology, the candidate character that has the highest recognition ranking among a plurality of characters to be recognized is selected as the first candidate character.
A multi-layer recognition result memory is provided in which the candidate character with the nth recognition ranking is stored in the nth distance layer (n is an integer of 2 or more). The candidate characters of the distance layer are stored in the corresponding storage area of the m distance layer (m is an integer from 2 to n),
By sequentially writing, n candidate characters were displayed in order of recognition rank, which resulted in problems such as slow processing speed and complicated control.

Furthermore, in the conventional technology, candidate characters could only be displayed in order of their recognition rankings, resulting in poor operability.

(D) Means for Solving the Problems The present invention provides a candidate memory that stores a plurality of candidate characters in consecutive storage areas in order of recognition ranking, and that stores the storage areas for a plurality of characters to be recognized; a first and second modification key, a modification pointer that is initialized each time the cursor key is pressed, and is incremented and decremented, respectively, in response to the pressing of the first and second modification keys; Addressing the candidate memory according to changing cursor position information and contents of the modification pointer;
This configuration includes a correction control section that sends specified contents to a display control section.

(e) Effect In the present invention, the candidate memory is addressed by the cursor position information and the contents of the modification pointer, and the modification pointer is incremented in response to the depression of the first modification key, and in response to the depression of the second modification key. Furthermore, since multiple candidate characters are stored in consecutive storage areas in the candidate memory in order of recognition rank, when the first correction key is pressed, a candidate character with a higher recognition rank than the displayed candidate character is displayed. is displayed, and when the second correction key is pressed, a candidate character with a lower recognition rank than the displayed candidate character is displayed.

(f) Embodiment FIG. 1 is a block diagram showing an embodiment of the present invention, in which numeral 1 includes a CCD image sensor and a paper feed mechanism, and a predetermined input paper 2 as shown in FIG. Read the written handwritten characters, 2
A character input section 4 converts the character pattern into a value or multi-value character pattern, stores the character pattern thus obtained in the input character pattern memory 3, and cuts out the stored character pattern one character at a time and sequentially sends it out. The dictionary unit 5 stores standard feature patterns of characters, and extracts feature patterns from input character patterns and compares them with standard feature patterns.
Calculate the similarity of both patterns, and select n with a large similarity
As shown in FIG. 3, the recognition unit 6 selects the candidate characters, determines the recognition ranking in descending order of similarity, and outputs the character code, for each of the plurality of characters to be recognized. n consecutive storage areas 6a,
6b... is allocated, and each storage area is also a candidate memory configured to be continuous. In the first to nth areas of each storage area of this candidate memory 6, n candidate character codes are assigned recognition rankings. Here, they are stored in descending order of recognition rate. Note that the candidate memory 6 must have at least a capacity to store n×N character codes, where N is the number of characters for one sheet of input paper 2.

Furthermore, in FIG. 1, numeral 7 comprises a drawing memory 8 into which the character code of the character to be displayed is written, a character generator 9 which converts the character code into a dot pattern, and a CRT display 10 for displaying the recognition results. character display device, 11 is
a display control unit having a cursor pointer 12 for specifying a cursor position on a CRT display 10;
13 is a keyboard equipped with a cursor movement key 14 and an up key 15 and a down key 16 as correction keys; 17 is a correction flag; 18 is a correction pointer; and 19 is a keyboard for inputting cursor position information and correction key information from the display control section 11. , a modification flag 17 and a modification pointer 18, and also addresses the candidate memory 6 and reads out the stored candidate character code and transfers it to the display control section 11. In the embodiment, the input paper 2 shown in FIG.
The recognition result of the character written in the upper left corner of the CRT
It is assumed that the cursor pointer 12 is displayed at the "0" position on the screen of the display 10.

Next, the operation of this embodiment will be explained, focusing on the processing contents of the modification control section 19 shown in FIG.

When the input form 2 shown in FIG. 2 is input into the character input unit 1, the recognition unit 5 selects n candidate characters for each character to be recognized and stores them in the candidate memory 6, as described above. , the first candidate character for each character to be recognized is sequentially transferred to the display control section 11 via the correction control section 19 and written into the drawing memory 8. Therefore, on the screen of the CRT display 10, the first candidate character for each of the characters to be recognized is displayed, as shown in FIG. Here, for example, the second character "ma" is misrecognized,
"Question" is displayed, and the second place of this character ~
Candidate characters up to the nth position include "open", "ma",
Assume that "Seki", . . . , "Threshold", and "Mon" are selected and stored in the first to nth areas of the storage area 6b of the candidate memory 6.

Therefore, in order to correct the character "Q", while looking at the CRT display 10, first operate the cursor movement key 14 to move the cursor to the position of the incorrectly recognized character "Q". Then, the user presses down key 16 as a correction key.

Then, the display control unit 11 changes the content KP of the cursor pointer 12 to "1" corresponding to the cursor position.
The cursor position information “1” and the correction key information CD indicating the down key are displayed in the display control unit 11.
The data is then transferred to the modification control unit 19. Then, the correction control section 19 performs the processing shown in the flowchart shown in FIG.

That is, the modification control unit 19 first initializes the content CP of the modification pointer 18 to "0" and also initializes the value m to "0". Then modify key information
Import the CD, set the correction flag CF to "0", and import the contents KP of the cursor pointer 12.
Compare with. In this case, KP=1, m=0, so
The content CP of the correction pointer 18 is initialized to "0" with m=KP. Next, the correction flag CF is checked, but in this case, since CF=0, the content CP of the correction pointer 18 is incremented, and the address AD of the candidate memory 6 is set to the cursor pointer 1.
2 and the contents KP and CP of the correction pointer 18. Then, since AD=n+1, the candidate character code stored in the second area of the storage area 6b, that is, the character code of the second candidate character "open" is read out and transferred to the display control unit 11. Ru. Since the display control unit 11 writes the character code "open" at the position indicated by the cursor pointer 12 in the screen memory 6, on the screen of the CRT display 10,
``Open'' is displayed instead of the character ``Question''.

In this case, since "open" is still a misrecognized character, the down key 16 is pressed once more. Then, the modification control unit 19 determines whether the content KP of the cursor pointer 12 has changed, and if it has not changed, further increments the content of the modification pointer 18.
Therefore, address AD=n+2 is specified in the candidate memory 6, and the character code of the third candidate character "ma" is read out.Similarly, on the screen of the CRT display 10, instead of the character "open", "while"
is displayed. As a result, the misrecognized character "Q" is corrected to the correct character "Ma".

In this way, when the down key 16 is pressed one after another, candidate characters are displayed in order of recognition rank, but after the nth candidate character "mon" is displayed, the down key 16 is pressed again. When pressed, the content CP of the correction pointer 18 is initialized to "0", so the first candidate character "Q" is displayed, and as shown in Figure 6A, the candidate character is cycled. will be displayed.

If there are other misrecognized characters, move the cursor to the position of the misrecognized characters and press the down key 16 in the same way. Then, cursor pointer 1
Since the content KP of 2 changes, in determining the value m indicating the KP when the previous modification key was pressed,
The change is determined, and the content of the correction pointer 18 is determined.
CP is initialized. Therefore, if the down key 16 is pressed in sequence, candidate characters for the misrecognized character at the position to which the cursor has been moved are sequentially displayed from the second position to the nth position.

Next, the case where the up key 15 is pressed will be explained. Currently, the nth candidate character "mon" is displayed at the cursor position of cursor pointer "1" on the CRT display 10, and the correction pointer 1
It is assumed that the content CP of 8 is "n-1".

Here, if you press the UP key 15, the correction flag will be displayed.
Since CF is set to "1", the content CP of the correction pointer 18 is decremented, and the address AD of the candidate memory 6 becomes 2n-2. For this reason,
The character code of the (n-1)th candidate character "threshold" is read and transferred to the display control unit 11. The display control unit 11 writes the transferred character code to the position indicated by the cursor pointer 12 in the screen memory 8, in the same way as when the down key 16 is pressed. Instead, a "threshold" will be displayed. below,
When the up key 15 is pressed one after another, the content CP of the correction pointer 18 is decremented each time, so candidate characters are displayed in order of recognition rank. When the up key 15 is further pressed after "Seki" is displayed, the correct character "Ma" is displayed and the correction of the misrecognized character is completed.

By the way, if you press the UP key 15, the first
The candidate character ``Question'' is displayed, but in this case,
If you press the up key 15 again, the correction pointer 18
Since the content CP of is set to "n-1", the nth candidate character "mon" is displayed again, and the candidate characters are displayed cyclically as shown in FIG. 6B.

In this way, the down key 16 and the up key 1
When 5 is pressed, characters with a higher recognition rank and a lower recognition rank than the displayed candidate character are respectively displayed. Therefore, if you are trying to correct the first candidate character ``Q'' and accidentally press the Down key 16 three times and fail to display the correct character ``Ma'', you can press the Up key 15 once. For example, misrecognized characters can be corrected.

(G) Effects of the Invention According to the present invention, it is possible to display a plurality of candidate characters in order of recognition order with simple control and short processing time, and when the second correction key is pressed, the first correction key is displayed. Since candidate characters are displayed in the reverse order of key presses, operability is significantly improved.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is an example of a handwritten character string written on an input sheet,
FIG. 3 is an explanatory diagram showing the configuration of the candidate memory, FIG. 4 is a flowchart showing the processing contents of the correction control section,
FIG. 5 is an explanatory diagram showing a display example, and FIG. 6 is an explanatory diagram showing a cyclic display. Explanation of main figure numbers, 1...Character input section, 5...Recognition section, 6...Candidate memory, 7...Character display device,
11...display control unit, 13...keyboard, 19
...Modification control section.

Claims (1)

[Claims] 1 A recognition unit that selects a plurality of candidate characters for one character to be recognized; and a recognition unit that stores the plurality of candidate characters in consecutive storage areas in the order of recognition ranking, and prepares the storage area for the plurality of characters to be recognized. a character display device for displaying recognition results, a display control unit, a cursor key, first and second correction keys, which are initialized each time the cursor key is operated;
A modification pointer that is incremented and decremented in response to pressing of the first and second modification keys, cursor position information that changes in response to the operation of the cursor key, and the address of the candidate memory based on the contents of the modification pointer. specify,
a correction control unit that sends specified content to the display control unit, and the display control unit selects a recognition rank higher than the candidate character displayed on the character display device in response to pressing of the first and second correction keys. A character recognition device characterized in that candidate characters having a low recognition rank are individually displayed.