Figure 5From: Vital sign sensing method based on EMD in terahertz bandComparison of previously presented detection algorithm and improved detection algorithm. (a) SPWVD of echo (the improved algorithm). (b) SPWVD of echo. (c) Centroid (the improved algorithm). (d) Centroid. (e) SPWVD of centroid (the improved algorithm). (f) SPWVD of centroid.Back to article page