Character recognition apparatus and method

• US 6,052,482 A
• Filed: 12/27/1996
• Issued: 04/18/2000
• Est. Priority Date: 01/12/1996
• Status: Expired due to Fees

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Yoshii, Hiroto, Arai, Tsunekazu, Takasu, Eiji
• Primary Examiner(s): COUSO, YON JUNG
• Application Number:
  US08/773,838
• Time in Patent Office: 1,208 Days
• Field of Search: 382/185, 382/187, 382/188, 382/189, 382/190, 382/192, 382/209, 382/214, 382/219, 382/227
• US Class Current: 382/187
• CPC Class Codes: G06F 18/40 Software arrangements specially adapted for pattern recognition, e.g. user interfaces or toolboxes therefor

Abstract

A threshold value for identifying similar characters is set at will from a keyboard. It is determined whether a character entered on a character input panel by a pen is a similar character and, if the entered character is judged to be a similar character, a feature quantity of this character is calculated. The calculated feature quality and the set threshold value are compared. On the basis of the comparison, the character determined to be a similar character is identified as being in any of a plurality of character groups of similar characters.

Claims

1. A character recognition apparatus for recognizing an entered pattern comprising:

display means for displaying a plurality of patterns having a first and second pattern, wherein the plurality of patterns represent transformations of the first pattern transforming into the second pattern or vice versa;

designation input means, arranged together with the display means, for selecting one of the displayed intermediate patterns between the first and second patterns, which is designated by a user, and assigning the first pattern to a selected intermediate pattern as a first group and the pattern immediately after the selected intermediate pattern to the second pattern as a second group;

setting means for setting a feature quantity of the selected intermediate pattern as a threshold value for identifying said first and second patterns in a character recognition process;

identifying means for identifying to which group the entered pattern belongs on the basis of said threshold value; and

output means for outputting character code corresponding to the first or second pattern included in the group identified by said identifying means as a recognition result for the entered pattern.

2. The apparatus according to claim 1 wherein identifying means has

judging means for judging whether the entered pattern is a similar character;

calculating means for calculating a feature quantity of the entered pattern if said judging means has judged that the entered pattern is a similar character; and

comparison means for comparing the feature quantity calculated by said calculating means and the threshold value set by said setting means.

3. The apparatus according to claim 1, further comprising

memory means for storing the group of intermediate patterns.

4. The apparatus according to claim 1, further comprising acquisition means for recognizing the entered pattern and acquiring a character code that corresponds to the recognized pattern;

and

collating means for collating the character code acquired by said acquisition means and a character code of each character corresponding to a plurality of character groups of similar characters;

wherein it is determined whether the entered pattern is a similar character based upon results of collation performed by said collating means.

5. The apparatus according to claim 1, wherein said setting means includes input means for allowing a user to enter a handwritten similar character;

wherein a feature quantity of the handwritten similar character entered by the user is set as a threshold value.

6. The apparatus according to claim 5, wherein said input means has display means for displaying, in superimposed form, said first and second pattern;

wherein the handwritten similar character is entered on said first and second pattern displayed in superimposed form on said display means.

7. A character recognition method of recognizing an entered pattern, comprising:

a display step of displaying a plurality of patterns having a first and second pattern, wherein the plurality of patterns represent transformations as the first pattern transforming into the second pattern or vice versa;

a designation input step of selecting one of the displayed intermediate patterns between the first and second patterns, which is designated by a user, and assigning the first pattern to a selected intermediate pattern as a first group and the pattern immediately after the selected intermediate pattern to the second pattern as a second group;

a setting step of setting a feature quantity of the selected intermediate pattern as a threshold value for identifying said first and second pattern in a character recognition process;

an identifying step of identifying to which group the entered pattern belongs on the basis of said threshold value; and

an output step of outputting character code corresponding to the first or second pattern included in the group identified at said identifying step as a recognition result for the entered pattern.

8. The method according to claim 7 wherein said identifying step includes

a judging step of judging whether the entered pattern is a similar character;

a calculating step of calculating a feature quantity of the entered pattern if result of judgment at said judging step is that the entered pattern is a similar character; and

a comparison step of comparing the feature quantity calculated at said calculating step and the threshold value set at said setting step.

9. The method according to claim 7, further comprising

a storing step of storing the group of intermediate patterns.

10. The method according to claim 7, further comprising:

an acquisition step of recognizing the entered pattern and acquiring a character code that corresponds to the recognized pattern; and

a collating step of collating the character code acquired at said acquisition step and a character code of each character of a plurality of character groups of similar characters;

wherein it is determined whether the entered pattern is a similar character based upon results of collation performed at said collating step.

11. The method according to claim 7, wherein said setting step includes an input step of allowing a user to enter a handwritten similar character;

wherein a feature quantity of the handwritten similar character entered by the user is set as a threshold value.

12. The method according to claim 11, wherein said input step includes a display step of displaying, in superimposed form, said first and second pattern;

wherein the handwritten similar character is entered on said first and second pattern displayed in superimposed form at said display step.

13. A computer readable memory storing program codes for character recognition processing, comprising:

a program code of display step of displaying a plurality having a first and second pattern, wherein the plurality of patterns represent transformations as the first pattern transforming into the second pattern or vice versa;

a program code of designation input step, arranged together with the display step, of selecting one of the displayed intermediate patterns between the first and second patterns, which is designated by a user, and assigning the first pattern to a selected intermediate pattern as a first group and the pattern immediately after the selected intermediate pattern to the second pattern as a second group;

a program code of setting step of setting a feature quantity of the selected intermediate pattern as a threshold value for identifying said first and second pattern in a character recognition process;

a program code of identifying step of identifying to which group the entered pattern belongs on the basis of said threshold value; and

a program code of output step of outputting character code corresponding to the first or second pattern included in the group identified at said identifying step as a recognition result for the entered pattern.