Table 2.
Lossy compression results
|
Method |
Mus. |
Arr. |
Var. |
MVC |
|||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | ||||
| ACELP |
BB |
L |
FSR (%) |
87.3 |
|
87.3 |
|
|
87.3 |
87.3 |
|
| [10] |
|
|
SNR (dB) |
10.38 |
|
11.81 |
|
|
12.25 |
12.79 |
|
| JPEG |
UT |
L |
FSR (%) |
|
87.5 ± 0.5 |
|
87.1 ± 0.4 |
|
|
|
|
| |
|
|
SNR (dB) |
|
17.17 ± 0.74 |
|
18.63 ± 0.86 |
|
|
|
|
| |
|
|
MAE (A.U.) |
|
134.7 ± 10.4 |
|
168.0 ± 13.8 |
|
|
|
|
| |
|
|
q |
|
15 |
|
10 |
|
|
|
|
| JPEG |
UT |
T |
FSR (%) |
|
87.3 ± 0.4 |
|
87.2 ± 0.4 |
|
|
|
|
| |
|
|
SNR (dB) |
|
19.15 ± 0.78 |
|
20.45 ± 0.80 |
|
|
|
|
| |
|
|
MAE (A.U.) |
|
109.3 ± 10.5 |
|
147.3 ± 22.8 |
|
|
|
|
| |
|
|
q |
|
19 |
|
13 |
|
|
|
|
| JPEG |
MG |
L |
FSR (%) |
|
87.3 ± 0.6 |
|
87.3 ± 0.4 |
|
87.3 ± 0.3 |
|
87.3 ± 0.4 |
| |
|
|
SNR (dB) |
|
19.48 ± 0.42 |
|
19.98 ± 0.49 |
|
21.88 ± 0.59 |
|
23.33 ± 0.84 |
| |
|
|
MAE (A.U.) |
|
25.4 ± 1.7 |
|
43.9 ± 5.7 |
|
63.0 ± 6.6 |
|
78.5 ± 5.4 |
| |
|
|
q |
|
71 |
|
47 |
|
31 |
|
24 |
| JPEG |
MG |
T |
FSR (%) |
|
87.3 ± 0.5 |
|
87.3 ± 0.3 |
|
87.3 ± 0.3 |
|
87.2 ± 0.5 |
| |
|
|
SNR (dB) |
|
19.92 ± 0.37 |
|
20.99 ± 0.50 |
|
22.95 ± 0.58 |
|
24.24 ± 0.85 |
| |
|
|
MAE (A.U.) |
|
21.4 ± 2.2 |
|
35.9 ± 2.0 |
|
51.8 ± 4.6 |
|
62.0 ± 5.3 |
| |
|
|
q |
|
73 |
|
52 |
|
34 |
|
26 |
| IC [25] |
BB |
L |
FSR (%) |
|
|
|
|
89.6 |
|
|
|
| |
|
|
SNR (dB) |
|
|
|
|
15.58 |
|
|
|
| JPEG |
UT |
L |
FSR (%) |
|
89.6 ± 0.4 |
|
89.5 ± 0.4 |
|
|
|
|
| |
|
|
SNR (dB) |
|
15.81 ± 0.72 |
|
17.17 ± 0.87 |
|
|
|
|
| |
|
|
MAE (A.U.) |
|
160.5 ± 13.6 |
|
189.5 ± 17.8 |
|
|
|
|
| |
|
|
q |
|
10 |
|
06 |
|
|
|
|
| JPEG |
UT |
T |
FSR (%) |
|
89.5 ± 0.4 |
|
89.6 ± 0.4 |
|
|
|
|
| |
|
|
SNR (dB) |
|
17.66 ± 0.75 |
|
18.87 ± 0.82 |
|
|
|
|
| |
|
|
MAE (A.U.) |
|
129.4 ± 12.7 |
|
170.0 ± 26.1 |
|
|
|
|
| |
|
|
q |
|
13 |
|
08 |
|
|
|
|
| JPEG |
MG |
L |
FSR (%) |
|
89.6 ± 0.5 |
|
89.5 ± 0.3 |
|
89.7 ± 0.3 |
|
89.5 ± 0.4 |
| |
|
|
SNR (dB) |
|
17.84 ± 0.42 |
|
18.39 ± 0.49 |
|
20.09 ± 0.58 |
|
21.63 ± 0.83 |
| |
|
|
MAE (A.U.) |
|
30.8 ± 2.3 |
|
60.0 ± 7.2 |
|
78.3 ± 8.5 |
|
94.6 ± 8.3 |
| |
|
|
q |
|
57 |
|
32 |
|
20 |
|
16 |
| JPEG |
MG |
T |
FSR (%) |
|
89.6 ± 0.4 |
|
89.6 ± 0.3 |
|
89.7 ± 0.3 |
|
89.5 ± 0.4 |
| |
|
|
SNR (dB) |
|
18.37 ± 0.37 |
|
19.39 ± 0.50 |
|
21.14 ± 0.55 |
|
22.36 ± 0.83 |
| |
|
|
MAE (A.U.) |
|
26.4 ± 2.0 |
|
39.6 ± 1.6 |
|
67.5 ± 5.7 |
|
75.4 ± 6.8 |
| |
|
|
q |
|
60 |
|
35 |
|
22 |
|
17 |
| SP [25] |
BB |
|
FSR (%) |
|
|
|
|
91.0 |
|
|
|
| |
|
|
SNR (dB) |
|
|
|
|
15.55 |
|
|
|
| STP[25] |
BB |
|
FSR (%) |
|
|
|
|
91.0 |
|
|
|
| |
|
|
SNR (dB) |
|
|
|
|
18.96 |
|
|
|
| JPEG |
UT |
L |
FSR (%) |
|
91.1 ± 0.4 |
|
90.9 ± 0.4 |
|
|
|
|
| |
|
|
SNR (dB) |
|
14.72 ± 0.71 |
|
15.94 ± 0.87 |
|
|
|
|
| |
|
|
MAE (A.U.) |
|
176.7 ± 13.8 |
|
212.2 ± 12.9 |
|
|
|
|
| |
|
|
q |
|
7 |
|
4 |
|
|
|
|
| JPEG |
UT |
T |
FSR (%) |
|
91.2 ± 0.4 |
|
90.8 ± 0.4 |
|
|
|
|
| |
|
|
SNR (dB) |
|
16.44 ± 0.75 |
|
17.94 ± 0.83 |
|
|
|
|
| |
|
|
MAE (A.U.) |
|
148.6 ± 12.6 |
|
179.5 ± 19.0 |
|
|
|
|
| |
|
|
q |
|
9 |
|
6 |
|
|
|
|
| JPEG |
MG |
L |
FSR (%) |
|
91.0 ± 0.5 |
|
91.0 ± 0.3 |
|
91.1 ± 0.3 |
|
90.9 ± 0.4 |
| |
|
|
SNR (dB) |
|
16.74 ± 0.42 |
|
17.23 ± 0.48 |
|
18.92 ± 0.59 |
|
20.39 ± 0.83 |
| |
|
|
MAE (A.U.) |
|
38.4 ± 3.9 |
|
61.0 ± 4.1 |
|
91.0 ± 9.8 |
|
113.5 ± 10.3 |
| |
|
|
q |
|
44 |
|
24 |
|
15 |
|
12 |
| JPEG |
MG |
T |
FSR (%) |
|
91.0 ± 0.4 |
|
90.9 ± 0.3 |
|
90.9 ± 0.3 |
|
90.8 ± 0.4 |
| |
|
|
SNR (dB) |
|
17.34 ± 0.37 |
|
18.34 ± 0.49 |
|
20.03 ± 0.55 |
|
21.19 ± 0.82 |
| |
|
|
MAE (A.U.) |
|
30.3 ± 3.2 |
|
48.5 ± 3.0 |
|
70.5 ± 5.4 |
|
83.4 ± 4.8 |
| q | 48 | 27 | 17 | 13 | |||||||
File size reduction (FSR), signal-to-noise ratio (SNR), maximum absolute error (MAE) and quality (q) for lossy compression. Literature values reported in [10] are shown for biceps brachii (BB). Mean values ± standard deviation were computed for 40 epochs per contraction level (% of MVC) of upper trapezius (UT) signals and for 8 epochs per contraction level (% of MVC) of medial gastrocnemius (MG) signals. Arrangements were longitudinal (L) and transversal (T).