Systems and methods for ridge selection in scalograms of signals
First Claim
1. A device for determining a physiological parameter, the device comprising:
- a processor capable of;
transforming an input signal at least in part using a wavelet transform to generate a transformed signal;
generating a first wavelet scalogram based at least in part on the transformed signal;
detecting ridges within a region of the first wavelet scalogram;
determining one or more parameters for the detected ridges;
determining a ridge density distribution function based at least in part on the one or more parameters; and
selecting a ridge based at least in part on the ridge having a scale corresponding to a maximum value of the ridge density distribution function.
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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.
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9 Claims
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1. A device for determining a physiological parameter, the device comprising:
a processor capable of; transforming an input signal at least in part using a wavelet transform to generate a transformed signal; generating a first wavelet scalogram based at least in part on the transformed signal; detecting ridges within a region of the first wavelet scalogram; determining one or more parameters for the detected ridges; determining a ridge density distribution function based at least in part on the one or more parameters; and selecting a ridge based at least in part on the ridge having a scale corresponding to a maximum value of the ridge density distribution function. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
Specification