Research Article
A Novel Two-Stage Illumination Estimation Framework for Expression Recognition
Table 1
Comparison of different features.
| Feature | Dimension | Accuracy | Description |
| Saltire-over-cross feature | 2825 | 96.27 | The downsampled saltire-over-cross feature. | Saltire-over-cross feature | 5649 | 96.94 | The original saltire-over-cross feature. | Regional feature | 2856 | 94.47 | Select pixels of the whole facial region as feature, and resample the feature vector to 2856-dimension. | Regional feature | 5820 | 94.95 | Select pixels of the whole facial region as feature, and resample the feature vector to 5820-dimension. | Partitioned histogram | 11520 | 89.78 | Partition the whole facial region into some blocks, extract histogram from each block, and concatenate all histograms to form a feature vector. |
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