Method and apparatus for analysing gestures produced in free space, e.g. for commanding apparatus by gesture recognition
First Claim
1. Method of obtaining a signature (S) of a gesture (G) produced in free space, by deriving at least one time-evolving signal (14) representative of muscular activity involved in producing the gesture and determining at least one value of a parameter (Psfi) yielded by that signal, comprising the steps of:
- time dividing the time-evolving signal (14) into sub-frames (SF1, SF2, . . . ),for at least one sub-frame (SFi);
determining at least one said parameter value (Psfi) yielded by said time-evolving signal (14) over at least a part of that sub-frame (SFi), andexpressing said parameter value as a component of a vector (S) along a dimension thereof specifically allocated to that sub-frame (SFi),the resultant vector forming the signature (S) of said gesture (G); and
identifying an analyzed gesture among a set of previously learnt gestures acquired in a learning mode, each learnt gesture being expressed as a signature vector, wherein a decision on the identification of a gesture under identification is produced while that gesture is still giving rise to an active time-evolving signal (14).
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Abstract
The method obtains a signature (S) of a gesture produced in free space, e.g. for producing gesture recognition commands, by deriving at least one time-evolving signal representative of muscular activity involved in producing the gesture and determining at least one value of a parameter yielded by that signal.
The method comprises the steps of:
- time dividing the time-evolving signal (14) into sub-frames (SF1, SF2, . . . ), and
- for at least one sub-frame:
- determining at least one parameter value (Psfi) yielded by the signal over at least a part of that sub-frame, and
- expressing said parameter value as a component of a vector (S) along a dimension thereof specifically allocated to that sub-frame (SFi),
- the resultant vector yielding the signature (S) of said gesture.
The invention also relates to an apparatus producing such signatures and commands by gesture recognition.
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Citations
30 Claims
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1. Method of obtaining a signature (S) of a gesture (G) produced in free space, by deriving at least one time-evolving signal (14) representative of muscular activity involved in producing the gesture and determining at least one value of a parameter (Psfi) yielded by that signal, comprising the steps of:
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time dividing the time-evolving signal (14) into sub-frames (SF1, SF2, . . . ), for at least one sub-frame (SFi); determining at least one said parameter value (Psfi) yielded by said time-evolving signal (14) over at least a part of that sub-frame (SFi), and expressing said parameter value as a component of a vector (S) along a dimension thereof specifically allocated to that sub-frame (SFi), the resultant vector forming the signature (S) of said gesture (G); and identifying an analyzed gesture among a set of previously learnt gestures acquired in a learning mode, each learnt gesture being expressed as a signature vector, wherein a decision on the identification of a gesture under identification is produced while that gesture is still giving rise to an active time-evolving signal (14). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. Apparatus for obtaining a signature (S) of a gesture (G) produced in free space, by deriving at least one time-evolving signal (14) representative of muscular activity involved in producing the gesture and determining at least one value of a parameter (Psfi) yielded by that signal, comprising:
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means (36) for time dividing the time-evolving signal (14) into sub-frames (SF 1,SF2, . . . ), means (34) for determining at least one said parameter value (Psfi) yielded by said time-evolving signal over at least a part of that sub-frame, means (42) for expressing said parameter value as a component of a vector (S) along a dimension thereof specifically allocated to that sub-frame (SFi), the resultant vector forming the signature (S) of said gesture (G), and means for identifying an analyzed gesture among a set of previously learnt gestures acquired in a learning mode, each learnt gesture being expressed as a signature vector, wherein a decision on the identification of a gesture under identification is produced while that gesture is still giving rise to an active time-evolving signal (14). - View Dependent Claims (28, 29, 30)
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Specification