Systems and methods for ridge selection in scalograms of signals
First Claim
1. A method for determining a physiological parameter, the method comprising:
- generating at least one scalogram based at least in part on a wavelet transform of an input signal;
identifying ridges in the at least one scalogram;
determining at least one ridge parameter for the identified ridges;
characterizing the identified ridges as a function of scale, wherein the characterizing is based at least in part on the at least one ridge parameter for the identified ridges; and
determining a physiological parameter based at least in part on the characterizing of the identified ridges.
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Abstract
According to embodiments, systems, devices, and methods for ridge selection in scalograms are disclosed. Ridges or ridge components are features within a scalogram which may be computed from a signal such as a physiological (e.g., photoplethysmographic) signal. Ridges may be identified from one or more scalograms of the signal. Parameters characterizing these ridges may be determined. Based at least in part on these parameters, a ridge density distribution function is determined. A ridge is selected from analyzing this ridge density distribution function. In some embodiments, the selected ridge is used to determine a physiological parameter such as respiration rate.
124 Citations
20 Claims
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1. A method for determining a physiological parameter, the method comprising:
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generating at least one scalogram based at least in part on a wavelet transform of an input signal; identifying ridges in the at least one scalogram; determining at least one ridge parameter for the identified ridges; characterizing the identified ridges as a function of scale, wherein the characterizing is based at least in part on the at least one ridge parameter for the identified ridges; and determining a physiological parameter based at least in part on the characterizing of the identified ridges. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for determining a physiological parameter, comprising processing equipment configured for:
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generating at least one scalogram based at least in part on a wavelet transform of an input signal; identifying ridges in the at least one scalogram; determining at least one ridge parameter for the identified ridges; characterizing the identified ridges as a function of scale, wherein the characterizing is based at least in part on the at least one ridge parameter for the identified ridges; and determining a physiological parameter based at least in part on the characterizing of the identified ridges. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification