Method and apparatus for setting character style preferences in a pen-based computer system

• US 5,434,929 A
• Filed: 07/12/1994
• Issued: 07/18/1995
• Est. Priority Date: 07/12/1994
• Status: Expired due to Term

• Current Assignee: Apple Inc., Bryon Valve and Machine Company, Inc.
• Original Assignee: Apple Computer Incorporated (Apple Inc.)
• Inventors: Chechetkin, Eugeny, Auguste, Donna M., Beernink, Ernest H.
• Primary Examiner(s): Boudreau, Leo H.
• Application Number:
  US08/274,295
• Time in Patent Office: 371 Days
• Field of Search: 382/13, 382/39, 382/57, 382/59, 382/3, 382/14
• US Class Current: 382/187
• CPC Class Codes: G06F 18/28 Determining representative reference patterns, e.g. by averaging or distorting; Generating dictionaries
• CPC Class Codes: G06F 3/04883 for inputting data by handwriting, e.g. gesture or text

Abstract

In one method for setting character style preferences according to the present invention, a character style preference area is initially activated. Then, a plurality of variant character styles are displayed for a selected character with each character style representing a distinct way of writing the selected character that is recognized by the system recognizer. Inputs are then received, which indicate and set the probability that an input character style will be in a form similar to the selected character style. Other inputs include the selection of a different character for display, selection of a variant character style from the displayed area, selection of a reset command, and selection of a probability weight for a selected variant. The method further includes the slow redrawing of a selected variant within a selected variant group to demonstrate to the user the input strokes forming the selected variant. A computer system for performing the methods in accordance with the present invention is also described. The apparatus includes the mechanisms for activating a character style preference editor and for drawing a plurality of variant character styles. Also included is a mechanism for setting a use probability factor that is to be associated with the selected character style. Further included are the mechanisms for determining the selection of a probability level for the character styles and for shading the character styles appropriately to reflect the selected probability levels.

Claims

1. A method for indicating preferred character handwriting styles in a pen-based computer system that includes an input screen, a stylus for engaging the screen to input handwritten text to the computer system, and a recognizer for recognizing handwritten text, the method comprising the steps of:

activating a character style preference editor;

displaying a plurality of variant character styles for a selected character, each variant character style representing a distinct style of writing the selected character that is recognizable by the recognizer; and

receiving inputs indicative of the likelihood that a handwritten character input with the stylus will have a form analogous to a selected variant character style and setting a use probability factor associated with the selected variant character style in accordance with the input.

2. A method as recited in claim 1 further including displaying a recognized character style area, a probability selection area, a character index area, and a control bar area.

3. A method as recited in claim 1 further including processing inputs made to said character style preference editor.

4. A method as recited in claim 3 wherein said step of processing inputs further comprises determining whether an input has been made to select a variant group, wherein when said input has been made, said selection of said variant group is processed.

5. A method as recited in claim 3 wherein said step of processing inputs further comprises determining whether a character from a character index has been selected, wherein when a character has been selected, said character selection is processed.

6. A method as recited in claim 1 wherein said step of receiving inputs further comprises determining whether a probability weight has been selected, wherein when said probability weight has been selected, said probability weight selection is processed.

7. A method as recited in claim 3 wherein said step of processing inputs further comprises determining whether a reset selection has been made, wherein when said reset has been selected, said reset selection is processed.

8. A method as recited in claim 2 wherein said step of displaying a recognized character style area further comprises the substeps of:

determining the number of variants associated with a particular character;

determining the number of character spaces within the recognized character style area;

defining a first character space position; and

positioning a first variant group within said first character space position.

9. A method as recited in claim 8 wherein said step of positioning further comprises the substeps of:

determining a probability weight associated with a first variant group;

shading said first variant group in said first character space position in accordance with said probability weight;

defining a next character space position; and

positioning a next variant group within said next character space position.

10. A method as recited in claim 9 wherein said step of positioning is performed for each variant group.

11. A method as recited in claim 10 wherein after all of the variant groups are positioned, said method further comprises highlighting a selected variant group, updating a feedback string, highlighting a character in said character index, and highlighting a probability weight associated with said selected variant group.

12. A method as recited in claim 4 wherein said processing of said variant group selection further comprises the substeps of:

determining which variant group has been selected;

determining whether said selected variant group is different from a currently selected variant group, wherein when said selected variant group is different, said selected variant group is highlighted and said currently selected variant group is unhighlighted;

redrawing a selected variant within said selected variant group slowly; and

updating a probability weight associated with said selected variant group.

13. A method as recited in claim 5 wherein said processing of said character selection from said character index further comprises the substeps of:

determining which character has been selected;

determining the number of variant groups associated with a particular character;

determining the number of character spaces comprising the recognized character style area;

defining a first character space position; and

positioning a first variant group within said first character space position.

14. A method as recited in claim 13 wherein said step of positioning a first variant group further comprises the substeps of:

determining a probability weight associated with a first variant group;

shading said first variant group in said first character space position in accordance with said probability weight;

defining a next character space position; and

positioning a next variant group within said next character space position.

15. A method as recited in claim 13 wherein said step of positioning is performed for each variant group.

16. A method as recited in claim 15 wherein when each variant group is positioned, said method further comprises highlighting a selected variant group, updating a feedback string, highlighting a character in said character index, and highlighting a probability weight associated with said selected variant group.

17. A method as recited in claim 6 wherein said step of processing said probability selection further comprises the substeps of

determining what probability weight has been selected for a selected variant group;

and

determining whether the selected probability weight is the lowest probability weight;

wherein when said selected probability weight is not the lowest, said selected variant group probability weight is set to said selected probability weight, said selected variant group is redrawn to reflect the set probability weight, and said selection is displayed.

18. A method as recited in claim 17 wherein when the selected probability weight is the lowest, said method further comprises determining if any other variant groups for the character style are set to a higher probability weight, wherein when there is a variant group of a higher probability, said selected variant group is set to the selected probability weight, said selected variant group is redrawn to reflect the set probability weight, and said selection is displayed.

19. A method as recited in claim 18 wherein when there is not a variant group of a higher probability, said selected variant group is set to a higher level of probability, said selected variant group is redrawn to reflect the set probability weight, and said selection is displayed.

20. A method as recited in claim 7 wherein said step of processing said reset selection further comprises the substeps of displaying a warning that said reset has been selected, determining whether said selection is confirmed, wherein when said reset selection is confirmed, probability weights for all character styles are reset to default values.

21. A method of displaying recognizable character handwriting styles in a pen-based computer system that includes an input table for receiving inputs, a display for displaying outputs, a stylus for engaging the screen to input handwritten text to the computer system, and a recognizer for recognizing handwritten text, the method comprising the steps of:

displaying a plurality of distinct recognizable character styles for a selected character, each character style representing a distinct style of writing the selected character that is recognizable by the recognizer;

receiving inputs indicative of the selection of a particular one of the character styles; and

redrawing the selected character style in a stroke order associated with the selected character style at a speed that is discernible to a user to permit the user to view the stroke order associated with the selected character style.

22. A method as recited in claim 21 wherein said step of displaying further includes the substeps of:

determining the number of variants associated with a particular character;

determining the number of character spaces within the recognized character style area;

defining a first character space position; and

positioning a first variant group within said first character space position.

23. A method as recited in claim 22 further comprising the substeps of:

determining a probability weight associated with a first variant group;

shading said first variant group in said first character space position in accordance with said probability weight;

defining a next character space position; and

positioning a next variant group within said next character space position.

24. A method as recited in claim 23 wherein said step of positioning is performed for each variant group.

25. A method as recited in claim 23 wherein said step of shading said first variant group further comprises shading at a high level of shading for a highest probability level, at a medium level of shading for a medium probability level, and at a low level of shading for a probability level at a lowest level.

26. In a computer system that includes a display assembly for displaying outputs, an input tablet for receiving inputs, a stylus for engaging the input tablet to input handwritten text to the computer system, and a recognizer for recognizing handwritten text, a character style preference editor comprising:

means for activating a character style preference editor;

means for drawing a plurality of variant character styles for a selected character on the display assembly, wherein each variant character style represents a distinct style of writing the selected character that is recognizable by the recognizer; and

means for setting a use probability factor associated with a selected variant character style in accordance with a user initiated input to the character style preference editor indicative of a desired probability setting, whereby the use probability factor is utilized by the recognizer when attempting to recognize handwritten text input to the computer system.

27. A computer system as recited in claim 26 wherein said means for drawing draws a recognized character style area, a probability selection area, a character index area, and a control bar area.

28. A computer system as recited in claim 26 further comprising a means for shading which shades said variant character styles with a shading in accordance with the desired probability setting.

29. A computer system as recited in claim 28 wherein said means for shading shades said variant character style with a high level of shading for a highest probability level, with a medium level of shading for a medium probability level, and with a low level of shading for a probability level at a lowest level.

30. A computer system as recited in claim 26 wherein said means for drawing redraws a selected variant character style at a speed discernible to a user, so as to demonstrate an order and form of strokes comprising the selected variant character style.