Research Article
A Joint Learning Approach to Face Detection in Wavelet Compressed Domain
Table 3
The execution time (ms) of the proposed face detector and the original AdaBoost face detector for detecting faces from wavelet compressed images.
| | Image size (pixels) | Sliding windows | Tier 1 + Tier 2 | Method | IDWT | Integral images | Feature extraction | Classifiers | Processing time | Total time |
| | 8,411 | 27.6 | Original | 18.4 | 1.8 | 19.5 | 9.7 | 49.4 | 77.0 | | Proposed | — | 5.4 | — | 14.1 | 19.5 | 47.1 |
| | 41,243 | 95.7 | Original | 75.2 | 7.2 | 96.6 | 47.5 | 226.5 | 322.2 | | Proposed | — | 21.4 | — | 69.3 | 90.7 | 186.4 |
| | 113,789 | 207.4 | Original | 183.7 | 18.3 | 263.8 | 131.1 | 596.9 | 804.3 | | Proposed | — | 55.3 | — | 190.7 | 246.0 | 453.4 |
| | 291,580 | 488.1 | Original | 432.9 | 43.7 | 677.1 | 334.2 | 1,487.9 | 1,976.0 | | Proposed | — | 135.7 | — | 492.8 | 628.5 | 1,116.6 |
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