Reduce Surface Electromyography Channels for Gesture Recognition by Multitask Sparse Representation and Minimum Redundancy Maximum Relevance

Table 2

The selected 36 channel-feature variables by MTSR and mRMR. AR1∼AR4 are four coefficients in the fourth-order autoregressive model, respectively.

Channel	Features by MTSR	Features by mRMR
①	RMS, AR1, AR2, and AR4	WL, IAV, Kurtosis, SSI, and AR3
②	WL, Skewness, AR1, AR2, and AR3	WL, IAV, Kurtosis, and Skewness
③	WL, IAV, AR1, AR2, and AR3	WL, IAV, Kurtosis, and SSI
④	WL, IAV, AR1, and AR4	WL, IAV, and Kurtosis
⑤	RMS, Kurtosis, AR1, AR2, AR3, and AR4	WL, IAV, Kurtosis, SSI, and AR3
⑥	WL and Skewness	WL, IAV, SSI, and AR3
⑦	IAV, Skewness, AR1, and AR2	WL, IAV, Kurtosis, and AR3
⑧	WL, SSI, Kurtosis, Skewness, AR1, and AR2	WL, IAV, SSI, Kurtosis, Skewness, AR1, and AR2