Apparatus and method for measuring the quality of an extracted signal
First Claim
1. A system, comprising:
- a signal extractor, wherein the signal extractor is configured to receive a sequence of image frames of at least an area of interest of a subject, and to extract a signal representative of a physiological characteristic of the subject from a plurality of the image frames;
a signal analyzer, wherein the signal analyzer is configured to calculate a plurality of physiological information results from the signal using a plurality of calculation functions, wherein the plurality of calculation functions are included in a list of calculation functions, wherein the physiological information results are calculated using different calculation functions than each other, anda quality metric calculator, wherein the quality metric calculator is configured to calculate a quality metric value for the physiological information results based on a signal analysis metric derived from a comparison between the physiological information results,wherein the list of calculation functions comprises;
an autocorrelation function, a Fourier transform function, a power spectral density function, and a Laplace transform.
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Abstract
There is provided a system and method of assessing the quality of the extraction of the signal and the reliability of the physiological measurement by providing a system for producing a quality metric for physiological information extraction from a sequence of image frames, the system comprising a signal extraction unit configured to extract a signal representative of a physiological characteristic from a plurality of the image frames, a signal analyzer configured to calculate a plurality of physiological information results from the signal using a plurality of calculation functions, the plurality of calculation functions being comprised within a list of calculation functions, each physiological information result being calculated using a different calculation function, and a quality metric calculator for calculating a quality metric value based on a signal analysis metric derived from a comparison between the physiological information results of the plurality of physiological information results.
16 Citations
14 Claims
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1. A system, comprising:
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a signal extractor, wherein the signal extractor is configured to receive a sequence of image frames of at least an area of interest of a subject, and to extract a signal representative of a physiological characteristic of the subject from a plurality of the image frames; a signal analyzer, wherein the signal analyzer is configured to calculate a plurality of physiological information results from the signal using a plurality of calculation functions, wherein the plurality of calculation functions are included in a list of calculation functions, wherein the physiological information results are calculated using different calculation functions than each other, and a quality metric calculator, wherein the quality metric calculator is configured to calculate a quality metric value for the physiological information results based on a signal analysis metric derived from a comparison between the physiological information results, wherein the list of calculation functions comprises;
an autocorrelation function, a Fourier transform function, a power spectral density function, and a Laplace transform. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of producing a quality metric for an extraction of a physiological information result, the method comprising:
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extracting a signal representative of a physiological characteristic of a subject; calculating a plurality of physiological information results from the signal using a plurality of calculation functions, wherein the plurality of calculation functions is included within a list of calculation functions, wherein the physiological information results are calculated using different calculation functions than each other, and calculating a quality metric based on a comparison between the physiological information results, wherein the list of calculation functions comprises;
an autocorrelation function, a Fourier transform function, a Power Spectral Density function, and a Laplace transform. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification