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Examined feature sets and recognition rates.
| No. Feature set (no. of features) | Expression | Description | Rec. rate |
|---|---|---|---|
| F1 Pixel values (20) | pi,j | Pixel values from 20 sensors | 80.41% |
| F2 Sum (1) | ∑i,j pi,j | Sum of all pixel values | 28.75% |
| F3 F1+F2 (21) | pi,j, ∑i,j pi,j | Pixel values and the sum | 73.04% |
| F4 Three frame pixel values (60) | (pi,j)t−1, (pi,j)t, (pi,j)t+1 | Pixel values at times t − 1, t, t + 1 | 80.65% |
