Method and apparatus for recognizing input handwritten characters associated with title information

• US 5,991,440 A
• Filed: 03/10/1995
• Issued: 11/23/1999
• Est. Priority Date: 06/21/1991
• Status: Expired due to Fees

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Tatsumi, Eisaku, Tanaka, Atsushi, Matsubayashi, Kazuhiro, Mori, Shigeki, Taniishi, Shinnosuke
• Primary Examiner(s): Couso, Jose L.
• Assistant Examiner(s): Do, Anh Hong
• Application Number:
  US08/402,151
• Time in Patent Office: 1,719 Days
• Field of Search: 382/187, 382/189, 382/317, 382/197, 364/525
• US Class Current: 382/187
• CPC Class Codes: G06V 30/10 Character recognition
• CPC Class Codes: G06V 30/1444 Selective acquisition, locating or processing of specific regions, e.g. highlighted text, fiducial marks or predetermined fields

Abstract

The present invention relates to a character input apparatus and method which pairs the title of a heading to the region where a character is inputted and determines the character group which can be inputted into the region corresponding to the heading as input candidate characters. When a character is inputted in the region, the heading in that region is discriminated and the characters are recognized referring to the input candidate character group corresponding to the title of the heading.

Claims

1. A computer-based character input apparatus, comprising:

input means for inputting characters by using an input unit;

region recognition means for recognizing a region on an input surface of the input unit in which the characters have been input; and

character recognition means for, in a first, title-entry mode, recognizing the input characters in the region recognized by said region recognition means and for assigning a title to the region based on the recognized input characters, and for, in a second, data-entry mode, recognizing further characters input in the region to which the title has been assigned, the further characters recognized based on a limited set of expected characters related to the title.

2. An apparatus according to claim 1, further comprising:

means for setting the apparatus to operate in a plurality of modes including a plurality of freehand input modes.

3. An apparatus according to claim 1, wherein the modes include a ruled line mode whereby ruled line information can be input via said input means.

4. An apparatus according to claim 3, wherein the input unit has an input surface by means of which characters can be input, a region on the input surface is defined by the input of ruled line information in said ruled line mode.

5. An apparatus according to claim 4, wherein the modes include a data mode and a title mode.

6. An apparatus according to claim 1, further comprising:

display means having a display screen which is substantially the same size as the input surface and accommodated under the input surface, for displaying at least characters input by said input means and recognized characters.

7. An apparatus according to claim 6, wherein said character recognition means is adapted to cause said display means to display a plurality of candidate characters as a result of character recognition processing, in a case where the plurality of candidate characters are present in the limited set of expected characters, and to output a character selected among the plurality of candidate characters displayed by said display means as a recognition result.

8. An apparatus according to claim 1, further comprising:

candidate character designation means for designating the limited set of expected characters corresponding to the title.

9. A computer-based character input method for recognizing an input character and obtaining a character code corresponding to the input character, the method comprising:

an input step of inputting characters by using an input unit;

a recognition step of recognizing the characters input on the input surface; and

a region recognition step of recognizing a region of the input surface in which the characters are input,

wherein, in a first, title-entry mode, characters input in said input step are recognized and a title is assigned to the region based on the recognized characters, in said recognition step, and

wherein, in a second, data-entry mode, further characters input in the region to which the title is assigned are recognized in said recognition step based on a limited set of expected characters related to the title.

10. A method according to claim 9, further comprising:

a ruled line input step of inputting ruled line information.

11. A method according to claim 10, wherein a region on the input surface is defined by the ruled line information.

12. A method according to claim 9, wherein a plurality of candidate characters are displayed in said character recognition step as a result of character recognition processing, and in the case where the plurality of candidate characters are present in the limited set of expected characters, a character selected among the displayed plurality of candidate characters is output as a recognition result.

13. A method according to claim 9, further comprising:

a candidate character designation step of designating the limited set of expected characters corresponding to the title.

14. A computer-readable medium storing computer-executable process steps to recognize an input character and to obtain a character code corresponding to the input character, the process steps comprising:

an input step to input characters by using an input unit;

a recognition step to recognize the characters input on the input surface; and

a region recognition step to recognize a region of the input surface in which the characters are input,

wherein, in a first, title-entry mode, characters input in said input step are recognized and a title is assigned to the region based on the recognized characters, in said recognition step, and

wherein, in a second, data-entry mode, further characters input in the region to which the title is assigned are recognized in said recognition step based on a limited set of expected characters related to the title.

15. A computer-readable medium storing computer-executable process steps according to claim 14, the process steps further comprising:

a ruled line input step to input ruled line information.

16. A computer-readable medium storing computer-executable process steps according to claim 15, wherein a region on the input surface is defined by the ruled line information.

17. A computer-readable medium storing computer-executable process steps according to claim 14, wherein a plurality of candidate characters are displayed in said character recognition step as a result of character recognition processing, and in the case where the plurality of candidate characters are present in the limited set of expected characters, a character selected among the displayed plurality of candidate characters is output as a recognition result.

18. A computer-readable medium storing computer-executable process steps according to claim 14, the process steps further comprising:

a candidate character designation step to designate the limited set of expected characters corresponding to the title.