Apparatus and methods for hand motion tracking and handwriting recognition
First Claim
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1. Apparatus for handwriting recognition comprising:
- a hand-held device comprising at least one accelerometer providing an acceleration indicating output;
computation circuitry receiving said acceleration indicating output, discarding user specific components from said acceleration indicating output from said at least one accelerometer and providing a non-user specific output; and
a handwritten character recognizer receiving said non-user specific output and employing said non-user specific output for providing a character recognition output indication.
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Abstract
Apparatus and method for handwriting recognition including a hand-held device including at least one accelerometer providing an acceleration indicating output, computation circuitry receiving the acceleration indicating output and providing a velocity indicating output and a handwritten multiple character recognizer receiving the velocity indicating output and providing a multiple character recognition output indication.
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Citations
53 Claims
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1. Apparatus for handwriting recognition comprising:
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a hand-held device comprising at least one accelerometer providing an acceleration indicating output;
computation circuitry receiving said acceleration indicating output, discarding user specific components from said acceleration indicating output from said at least one accelerometer and providing a non-user specific output; and
a handwritten character recognizer receiving said non-user specific output and employing said non-user specific output for providing a character recognition output indication. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. Apparatus for hand motion tracking comprising:
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a hand-held device comprising at least one accelerometer providing an acceleration indicating output;
computation circuitry receiving said acceleration indicating output and providing a proportionally normalized velocity indicating output; and
a hand motion tracker receiving said velocity indicating output and providing a tracking output indication. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. Apparatus for handwriting recognition and hand motion tracking comprising:
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a hand-held device comprising at list one accelerometer providing an acceleration indicating output;
computation circuitry receiving said acceleration indicating output discarding user specific components from said acceleration indicating output from said at least one accelerometer and providing a non-user specific output;
a handwritten character recognizer receiving said non-user specific output and employing said non-user specific output for providing a character recognition output indication; and
a hand motion tracker receiving said non-user specific output and providing a tracking output indication. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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27. A pen computer comprising:
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a hand-held device comprising at least one accelerometer providing an acceleration indicating output;
computation circuitry located within said hand-held device and receiving said acceleration indicating output and providing a non-user specific output;
a handwritten character recognizer located within said hand-held device and receiving said non-user specific output and employing said non-user specific output for providing a character recognition output indication; and
a computer located within said hand-held device for receiving said character recognition output indication as performing computer operations in response thereto. - View Dependent Claims (28, 29, 30, 31, 32, 33)
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34. A pen communicator comprising:
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a hand-held device comprising at least one accelerometer providing an acceleration indicating output;
computation circuitry located within said hand-held device and receiving said acceleration indicating output and providing a proportionally normalized velocity indicating output;
a handwritten character recognizer located within said hand-held device and receiving said proportionally normalized velocity indicating output and employing said velocity indicating output for providing a character recognition output indication; and
a communication device located within said hand-held device for receiving said character recognition output indication and performing communication operations in response thereto. - View Dependent Claims (35, 36, 37, 38, 39, 40)
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41. A method for handwriting recognition comprising:
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providing an acceleration indicating output from a hand-held device;
receiving said acceleration indicating output, discarding user specific components therein and providing a non-user specific output; and
receiving said non-user specific output and employing said non-user specific output for providing a character recognition output indication. - View Dependent Claims (42, 51, 52, 53)
applying an extent of normalization to an individual sample depending on the position of the sample within a velocity record relative to the beginning and end of said velocity record.
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52. A method for hand motion tracking according to claim 42 and wherein said providing a proportionally normalized velocity indicating output comprises:
normalizing a velocity record depending only on the position of a sample within said velocity record relative to the beginning and end of said velocity record.
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53. A method for hand motion tracking according to claim 42 and wherein said providing a proportionally normalized velocity indicating output comprises:
applying an extent of normalization to an individual sample depending only on the position of the sample within a velocity record relative to the beginning and end of said velocity record.
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43. A method for hand motion tracking comprising:
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providing an acceleration indicating output from a hand-held device;
receiving said acceleration indicating output and providing a V proportionally normalized velocity indicating output; and
receiving said velocity indicating output and providing a tracking output indication. - View Dependent Claims (44, 45, 46, 47, 48, 49, 50)
normalizing at least a portion of the acceleration indicating output to a level of the average of the first few samples of the acceleration indicating output.
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47. A method according to claim 43 and further comprising:
determining the last intentional motion sample of the acceleration indicating output and eliminating samples following said last intentional motion sample of the acceleration indicating output.
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48. A method according to claim 47 and wherein determining of the last intentional motion sample comprises:
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examining a record of the output of at least one of said acceleration sensors in order to determine the average of the last few samples;
thereafter, examining said record sequentially from the last few samples backwards in time direction until a variation from the average of at least a predetermined magnitude is encountered; and
determining a time location of this variation to be the time location of the last intentional motion.
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49. A method according to claim 43 and wherein said providing a velocity indicating output further comprises identification of minimum motion points.
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50. A method for hand motion tracking according to claim 43 and wherein said providing a proportionally normalized velocity indicating output comprises:
normalizing a velocity record depending on the position of a sample within said velocity record relative to the beginning and end of said velocity record.
Specification