On-line character recognition using closed-loop detector
First Claim
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1. The method of recognizing handwritten characters being written by a stylus upon a writing surface, comprising:
- a. sensing stylus contact with the writing surface;
b. sensing all directions traveled by the stylus upon the writing surface using a closed-loop detector;
c. storing all directions sensed in the form of a data string;
d. sensing the end of stylus contact with the writing surface;
e. matching the stored string with a table of known strings.
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Abstract
An on-line handwritten character recognition system utilizing a novel "closed-loop" type detector. The detector senses the direction of movement of the writing element across the writing surface, and is constrained in generation of strings of directions traveled to traverse all intervening directions between any two traveled by the writing element by requiring the detector to move only between adjacent directions.
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Citations
18 Claims
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1. The method of recognizing handwritten characters being written by a stylus upon a writing surface, comprising:
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a. sensing stylus contact with the writing surface; b. sensing all directions traveled by the stylus upon the writing surface using a closed-loop detector; c. storing all directions sensed in the form of a data string; d. sensing the end of stylus contact with the writing surface; e. matching the stored string with a table of known strings.
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2. A closed-loop detector for handwriting comprising:
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a. handle means for grasping by a user; b. stylus means for contacting and moving across a writing surface for writing thereon operably located at one end of the handle means; c. switch means connected to said pen means for generating a "pen-down" signal for indicating contact between the stylus means and the writing surface; d. direction detector means cooperating with the stylus means for generating a signal indicative of a plurality of directions of stylus means motion on the writing surface; e. said direction detector means being constrained to move only from one of the plurality of detected directions to the next adjacent direction. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A character recognition system comprising:
a. A plurality of closed-loop detectors, each comprising; 1. handle means for grasping by a user; 2. stylus means for contacting and moving across a writing surface for writing thereon operably located at one end of the handle means; - View Dependent Claims (17)
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16. switch means connected to said pen means for generating a "pen-down" signal for indicating contact between the stylus means and the writing surface;
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4. direction detector means for cooperating with the stylus means for generating a signal indicative of a plurality of directions of stylus means motion on the writing surface; 5. said direction detector means being constrained to move only from one of the plurality of detected directions to the next adjacent direction; b. processor means for accepting data from the detectors and producing data strings indicating the path traveled; c. decoder means for decoding the data from the processor means, comprising; 1. memory means for storing known character patterns and associated characters; 2. matching means for comparing the data string from the processor means to the known character patterns stored in the memory means; 3. output means for indicating which character is associated with the data string from the processor means. - View Dependent Claims (18)
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Specification