Mobile communication terminal

• US 20070216658A1
• Filed: 03/17/2006
• Published: 09/20/2007
• Est. Priority Date: 03/17/2006
• Status: Active Grant

• Current Assignee: WSOU Investments, LLC (WSOU Holdings, LLC)
• Original Assignee: Nokia Corporation
• Inventors: Rainisto, Roope
• Granted Patent: US 7,777,728 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 3/04886 by partitioning the display area of the touch-screen or the surface of the digitising tablet into independently controllable areas, e.g. virtual keyboards or menus

Abstract

It is presented a text input method for an electronic apparatus with a touch sensitive display, the apparatus comprising a user interface, wherein a virtual keyboard is displayed on the display so as to facilitate input of an intended character for a user by touching keys of the virtual keyboard with a pointer, wherein the intended character is determined by considering: a plurality of candidate characters, the plurality of candidate characters being determined with regard to a raw distance, the raw distance being a distance between a first position, the first position being a position of a detected touch of the pointer, and a position corresponding to a character, and linguistic probabilities of each character of the plurality of candidate characters being an intended character. A corresponding electronic apparatus and computer program product are also presented.

Claims

1. A text input method for an electronic apparatus with a touch sensitive display, said apparatus comprising a user interface, wherein a virtual keyboard is displayed on said display so as to facilitate input of an intended character for a user by touching keys of said virtual keyboard with a pointer, wherein said intended character is determined by considering:

a plurality of candidate characters, said plurality of candidate characters being determined with regard to a raw distance, said raw distance being a distance between a first position, said first position being a position of a detected touch of said pointer, and a position corresponding to a character, and

linguistic probabilities of each character of said plurality of candidate characters being an intended character.

2. The text input method according to claim 1, wherein said plurality of candidate characters are determined also with regard to a direction of movement of said pointer.

3. The text input method according to claim 1, wherein each key is associated with a respective key area, said method comprising the steps of:

detecting a touch on said touch sensitive display at said first position,

calculating a tap distance and a tap direction between said first position and a second position, said second position being a position of a previously detected touch position,

associating a candidate area with said first position, the candidate area having a predetermined spatial extent,

creating a candidate list of characters, each character in said candidate list having at least part of its respective key area overlapping at least part of said candidate area,

for said each character in said candidate list, determining said raw distance between a position corresponding to said each character and said first position,

determining a probability value for said each character in said candidate list, said probability value being said linguistic probability of said each character,

for said each character in said candidate list, calculating a weighted distance, said weighted distance being calculated using said raw distance and said probability value, and

determining said intended character, said intended character being determined as the character in said candidate list with a smallest weighted distance.

4. The method according to claim 3, wherein said step of determining a probability value involves determining a probability value based on at least one previously input character.

5. The method according to claim 3, wherein said step of determining a probability value involves determining a probability value based on at least one previously input character and an input language.

6. The method according to claim 3, wherein said step of associating a candidate area with said first position involves determining said candidate area with consideration to said tap distance and said tap direction.

7. The method according to claim 3, wherein said step of associating a candidate area with said first position involves determining said candidate area, said candidate area being relatively longer along a first axis and relatively shorter along a second axis, said first axis being parallel to said tap direction and said second axis being perpendicular to said first axis.

8. The method according to claim 7, wherein said candidate area is of an elliptical shape.

9. The method according to claim 7, wherein said candidate area is of a teardrop shape.

10. The method according to claim 3, wherein said step of for said each character in said candidate list, calculating a weighted distance, said weighted distance is proportional to both said raw distance and the difference between the constant one and said probability value.

11. The method according to claim 3, wherein said step of detecting a touch on said touch sensitive display at said first position involves detecting a duration of said touch,

and said method comprises the further step, after said step of determining an intended character, of:

conditionally determining said intended character to be a character directly corresponding to said first position, said condition comprising at least that said touch has a duration being longer than a threshold duration.

15. A computer program product directly loadable into a memory of a processor, where said computer program product comprises program code for performing the method as defined in claim 1 when executed by said processor.

12. An electronic apparatus comprising a user interface with a touch sensitive display, and a controller coupled to said display, said user interface including a virtual keyboard which is presentable on said display so as to facilitate input of an intended character for a user by touching keys of said virtual keyboard with a pointer, each key being associated with a respective key area, said user interface including a character selection functionality for determining an intended character, said controller being adapted for determining said intended character considering:

a plurality of candidate characters, said plurality of candidate characters being determined with regard to a raw distance, said raw distance being a distance between a first position, said first position being a position of a detected touch of said pointer, and a position corresponding to a character, and

linguistic probabilities of each character of said plurality of candidate characters being an intended character.

13. The electronic apparatus according to claim 12, in the form of a pocket computer.

14. The electronic apparatus according to claim 12, in the form of a mobile terminal for a mobile telecommunications network.