Peak feature | Feature name | Equation | Description |
---|---|---|---|
Amplitudes | Peak-to-peak amplitude of the first half wave | \(f_{1} = \left| {x\left( {PP_{i} } \right) - x\left( {VP1_{i} } \right)} \right|\) | Amplitude between the magnitude of peak and the magnitude of valley at the first half wave |
Peak-to-peak amplitude of the second half wave | \(f_{2} = \left| {x\left( {PP_{i} } \right) - x\left( {VP2_{i} } \right)} \right|\) | Amplitude between the magnitude of peak and the magnitude of valley of the second half wave | |
Turning point amplitude of the first half wave | \(f_{3} = \left| {x\left( {PP_{i} } \right) - x\left( {TP1_{i} } \right)} \right|\) | Amplitude between the magnitude of peak and the magnitude of turning point at the first half wave | |
Turning point amplitude at the second half wave | \(f_{4} = \left| {x\left( {PP_{i} } \right) - x\left( {TP2_{i} } \right)} \right|\) | Amplitude between the magnitude of peak and the magnitude of turning point at the second half wave | |
Moving average amplitude | \(f_{5} = \left| {x\left( {PP_{i} } \right) - MAC\left( {PP_{i} } \right)} \right|\) | Amplitude between the magnitude of peak and the magnitude of moving average | |
Widths | Peak width | \(f_{6} = \left| {VP1_{i} - VP2_{i} } \right|\) | Width between valley point of first half point and valley point at second half wave |
First half wave width | \(f_{7} = \left| {PP_{i} - VP1_{i} } \right|\) | Width between peak point and valley point at first half wave | |
Second half wave width | \(f_{8} = \left| {PP_{i} - VP2_{i} } \right|\) | Width between peak point and valley point of second half wave | |
Turning point width | \(f_{9} = \left| {TP1_{i} - TP2_{i} } \right|\) | Width between turning point at first half wave and turning point at the second half wave | |
First half wave turning point width | \(f_{10} = \left| {PP_{i} - TP1_{i} } \right|\) | Width between turning point at first half wave and peak point | |
Second half wave Turning point width | \(f_{11} = \left| {PP_{i} - TP2_{i} } \right|\) | Width between turning point at second half wave and peak point | |
FWHM | \(f_{12} = \left| {HP1_{i} - HP2_{i} } \right|\) | Width between half point of first half wave and half point of second half wave | |
Slopes | Peak slope at the first half wave | \(f_{13} = \left| {\frac{{x\left( {PP_{i} } \right) - x\left( {VP1_{i} } \right)}}{{PP_{i} - VP1_{i} }}} \right|\) | Slope between a peak point and valley point at the first half wave |
Peak slope at the second half wave | \(f_{14} = \left| {\frac{{x\left( {PP_{i} } \right) - x\left( {VP2_{i} } \right)}}{{PP_{i} - VP2_{i} }}} \right|\) | Slope between a peak point and valley point at the second half wave | |
Turning point slope at the first half wave | \(f_{15} = \left| {\frac{{x\left( {PP_{i} } \right) - x\left( {TP1_{i} } \right)}}{{PP_{i} - TP1_{i} }}} \right|\) | The slope between peak point and turning point at the first half wave | |
Turning point slope at the second half wave | \(f_{16} = \left| {\frac{{x\left( {PP_{i} } \right) - x\left( {TP2_{i} } \right)}}{{PP_{i} - TP2_{i} }}} \right|\) | The slope between peak point and turning point at the second half wave |