Patent ID: 11899439
Assignee: SEIKO EPSON CORPORATION
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 3:
4. The method according to claim 3, wherein the calculation of the index value includes:
performing, for each of the plurality of change points located within an analysis range centered on the target change point with respect to the specific variable axis,
(i) extraction of one of the plurality of change points as an extraction reference point in a two-axis graph represented by the specific variable axis and a detection axis that represents the sensor detection value and is different from the specific variable axis,
(ii) calculation of a target area that is an area of a target region surrounded by an auxiliary line and a plurality of plots, the auxiliary line, in the two-axis graph, extending from the extraction reference point along the specific variable axis and extending toward a side opposite to the extraction reference point across the target change point with respect to the specific variable axis, the plurality of plots corresponding to the plurality of sensor detection values on the two-axis graph, and
(iii) calculation of a length of a line segment forming the target region of the auxiliary line; and

determining, as the reference change point, the extraction reference point having a largest ratio of the target area with respect to the length of the line segment based on the calculation of the target area and the length of the line segment for each of a plurality of extraction reference points.