Handwriting recognition employing pairwise discriminant measures
First Claim
1. In a handwriting recognition system, a method for discriminating a first handwritten character from a second handwritten character, comprising the steps of:
- selecting one or more discriminants that satisfy a predetermined threshold relating to a number of occurrences (N) of original characters in a training set and to a predetermined threshold relating to a percent accuracy (P) in correctly differentiating between training characters;
assigning a weight to each selected discriminant, the weight being equal to a product (P*G) of a goodness value (G) associated with the discriminant and (P); and
summing the weights to discriminate between the first and the second characters.
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Abstract
In a handwriting recognition system a method for differentiating a first character from a second character having similar characteristics. The method includes the steps of determining during a training session at least one pairwise discriminant measure associated with the first character and with the second character. The step of determining includes a step of evaluating with a potential discriminant measure a plurality of prototype first characters and a plurality of prototype second characters. Subsequently, during a handwriting recognition session, the method evaluates with at least one of the previously determined discriminant measures selected from a set of same an input character identified as being either the first prototype character or the second prototype character. The step of evaluating includes a step of analyzing a stroke or strokes associated with the input character in accordance with one or more of the pairwise discriminant measures selected from the set, summing the results of each discriminant measure analysis to obtain a result for each of the pair of characters associated with the pairwise discriminate measure, and selecting a character from the pair that has a maximum value result.
33 Citations
18 Claims
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1. In a handwriting recognition system, a method for discriminating a first handwritten character from a second handwritten character, comprising the steps of:
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selecting one or more discriminants that satisfy a predetermined threshold relating to a number of occurrences (N) of original characters in a training set and to a predetermined threshold relating to a percent accuracy (P) in correctly differentiating between training characters; assigning a weight to each selected discriminant, the weight being equal to a product (P*G) of a goodness value (G) associated with the discriminant and (P); and summing the weights to discriminate between the first and the second characters. - View Dependent Claims (4)
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2. A method as set forth in 1 wherein G is defined as a difference between a mean of a first prototype character (char1) and a mean of a second prototype character (char2) divided by an average of a standard deviation of the first prototype character and a standard deviation of the second prototype character in accordance with the expression:
- ##EQU5##
- View Dependent Claims (3)
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5. In a handwriting recognition system, a method for differentiating a first character from a second character, comprising the steps of:
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determining during a training session at least one discriminant measure associated with the first character and with the second character, the step of determining including a step of evaluating with a potential discriminant measure a plurality of prototype first characters and a plurality of prototype second characters; and during a handwriting recognition session evaluating with at least one of the previously determined discriminant measures an input character identified as being either the first prototype character or the second prototype character; wherein the step of determining includes a step of calculating a goodness value associated with the first prototype character and the second prototype character, wherein the goodness value is defined as a difference between a mean of the first prototype character (char1) and a mean of the second prototype character (char2) divided by an average of a standard deviation of the first prototype character and a standard deviation of the second prototype character in accordance with the expression ##EQU6## - View Dependent Claims (6, 7, 8, 9, 10)
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11. A method of determining with a handwriting recognition system an identity of a handwritten character tentatively identified to be either a first character or a second character, the method including the steps of inputting a handwritten stroke or strokes expressive of a character;
- and analyzing the strokes in accordance with one or more pairwise discriminant measures selected from a set of pairwise discriminant measures, the selected pairwise discriminant measure or measures having been previously determined to accurately discriminate at least (P) percent of the time between the first character and the second character based on a plurality of at least N prototype first characters and on a plurality of at least N prototype second characters.
- View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
Specification