In-waveform peak end point detecting method and detecting device
AssigneeShimadzu Corporation
InventorHiroaki KOZAWA
Life of this patent
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Abstract
A device for detecting a peak end point including a peak end point position detecting unit for using, as a base point, a position on horizontal axis at which a local maximum value is obtained to detect, as a position on horizontal axis of a peak end point, a first point at which a value of the inflection point extraction waveform decreases to the relative threshold value in a direction farther from a position on horizontal axis corresponding to the peak top position, and detecting, as the peak end point, a point on the peak detection target waveform corresponding to the position on horizontal axis of the peak end point.
Claims16
A peak end point detecting method comprising the steps of:
- a) acquiring an inflection point extraction waveform of a peak detection target waveform;
- b) acquiring a peak top position of the peak detection target waveform;
- c) detecting a local maximum value of the inflection point extraction waveform and a position on horizontal axis at which the local maximum value is obtained, on any one of right and left sides of the peak top position of the peak detection target waveform;
- d) calculating a relative threshold value by multiplying the local maximum value by a relative threshold ratio having a predetermined value of between 0 and 1;
- and
- e) using, as a base point, the position on horizontal axis at which the local maximum value is obtained to detect, as a position on horizontal axis of a peak end point, a first point at which a value of the inflection point extraction waveform decreases to the relative threshold value in a direction farther from a position on horizontal axis corresponding to the peak top position, and detecting, as the peak end point, a point on the peak detection target waveform corresponding to the position on horizontal axis of the peak end point.
A peak end point detecting device comprising:
- a) a waveform analyzing unit for acquiring an inflection point extraction waveform of a peak detection target waveform;
- b) a peak top position acquiring unit for acquiring a peak top position of the peak detection target waveform;
- c) a reference value acquiring unit for detecting a local maximum value of the inflection point extraction waveform and a position on horizontal axis at which the local maximum value is obtained, on any one of right and left sides of the peak top position of the peak detection target waveform;
- d) a relative threshold value calculating unit for calculating a relative threshold value by multiplying the local maximum value by a relative threshold ratio having a predetermined value of between 0 and 1;
- and
- e) a peak end point position detecting unit for using, as a base point, the position on horizontal axis at which the local maximum value is obtained to detect, as a position on horizontal axis of a peak end point, a first point at which a value of the inflection point extraction waveform decreases to the relative threshold value in a direction farther from a position on horizontal axis corresponding to the peak top position, and detecting, as the peak end point, a point on the peak detection target waveform corresponding to the position on horizontal axis of the peak end point.
Dependencies are inferred from the claim text.