Figure 5

Features used in the classification process. Area between QRS offset and T peak with respect to the reference mean voltage $\overline{\mathit{\text{fecg}}\left(\mathrm{QRS}\text{onset}\right)}$ in cases of (a) ST segment elevation and (b) ST segment depression. (c) Normalized and signed sum of voltage deviations from the QRS offset to the first point F at which voltage becomes equal to the reference voltage. (d) Slope from the QRS onset point to the QRS offset point. Markers ○, ♦ and ▵ designate QRS onset, peak and offset points respectively.