Research Article
Railway Subgrade Defect Automatic Recognition Method Based on Improved Faster R-CNN
Table 2
Data augmentation methods applied in the improved model.
| Data Augmentation Method | Method description |
| Flip | Flipping the image horizontally or vertically. | Contrast | Changing the saturation S and V luminance component in the HSV color space of the image, and keeping the tone H unchanged. | Zoom | Enlarging or compressing the image according to a certain proportion. | Random Cropping | Clipping the image randomly, including the scale jittering method and the enhancement transform of dimension and length-width ratio. | Rotation | Rotating the image at arbitrary angle to change the orientation. |
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