Table 3.
Performance of the preprocessing methods.
| Primitive | Preprocessing | Average Size | Ratio |
|---|---|---|---|
| Timestamp 1 | None | 5563 Byte | - |
| Delta + VLI | 1748 Byte | 3.18 | |
| DOD + VLI | 1518 Byte | 3.66 | |
| Integer 2 | None | 1069 Byte | - |
| VLI | 445 Byte | 2.40 | |
| Delta + VLI | 284 Byte | 3.76 | |
| DOD + VLI | 284 Byte | 3.76 | |
| Float 3 | None | 7050 Byte | - |
| F2I + VLI | 3239 Byte | 2.18 | |
| F2I + Delta + VLI | 2228 Byte | 3.16 | |
| F2I + DOD + VLI | 2243 Byte | 3.14 | |
| String 4 | None | 120 Byte | - |
| Dictionary + VLI | 34 Byte | 3.53 |
The results have been computed from datasets acquired from a real vehicle that was driven on a public street. 1 291 sequences; 39 sensors; 269,678 samples. 2 109 sequences; 12 sensors; 29,143 samples. 3 137 sequences; 11 sensors; 241,231 samples. 4 127 sequences; 17 sensors; 2330 samples