Research Article

Comparison of Initialization Techniques for the Accurate Extraction of Muscle Synergies from Myoelectric Signals via Nonnegative Matrix Factorization

Table 2

Cosine similarity QR between pairs of homologous synergy vectors extracted via different initialization methods. Similarity values are presented when the extraction is performed on the original and on the artificially corrupted EMGs, built as .

/SPARSENSVDRAND

0.99/0.990.99/0.940.98/0.87
0.97/0.990.99/0.990.98/0.98
0.98/0.990.98/0.990.97/0.70
0.99/0.990.99/0.970.99/0.97