AAL Middleware Infrastructure for Green Bed Activity Monitoring

Figure 11

Confusion matrices for the bed positions. The two axes on the base of each graph represent the actual position class and the class predicted by the algorithm, respectively. The performance achieved by leveraging 𝑆₂ is given as a function of the features number (𝜇, 𝜎, LCR2, and LCR4) at 1 Hz, and sample frequency (1, 2, 4, and 8 Hz) when only two features (𝜇 and 𝜎) are selected. The smaller the bars outside of the main diagonal, the better the performance.