An Example: Face Recognition Using Backpropagation
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4.7 Face Recognition with Backpropagation
This section walks through applying Backpropagation to a real learning task — recognising which direction a person is facing from a camera image. It illustrates the design decisions every ANN practitioner must make, and what the network actually learns internally.
4.7.1 The Task
Dataset
| Property | Detail |
|---|---|
| Total images | 624 greyscale images |
| Subjects | 20 different people |
| Images per person | ~32 |
| Image resolution | 120 × 128 pixels |
| Pixel depth | Greyscale, 0–255 |
Variations within the dataset: