Cyborg and Bionic Systems / 2021 / Article / Fig 6

Research Article

Classifying Motion Intention of Step Length and Synchronous Walking Speed by Functional Near-Infrared Spectroscopy

Figure 6

The feature vectors under the different levels of step length: (a) represents the important feature vectors under the total hemoglobin parameter; (b) represents the important feature vectors under the difference between oxygenated hemoglobin and deoxygenated hemoglobin parameters. The red square presents that these feature regions were under the top 20%, and the blue one represents that the feature regions were under the bottom 20%. The digit in the red and blue square represents the key number in this region. For example, if the digit “1” was in the red square, it means that the feature vector is a channel with the largest value in this area; if the digit “1” was in the blue square, it represents the smallest one. The specific representation of serial numbers is shown in Table 3.

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