*5.3. Cracks Detection and Localization*

To provide an assessment of the trained Faster R-CNN for detecting and localizing concrete cracks, new images of cracked concrete elements taken during laboratory experiments on prestressed crane runway beam in the three-point bending test were provided to the trained model.

Figure 15 shows detected and localized cracks in concrete beam with the Faster R-CNN. As can be seen, the network correctly detected and localized all the cracks (diagonal and vertical) visible in the image (green rectangles) with high certainty (more than 98%).

**Figure 15.** Detected and localized surface cracks (green rectangles) in the testing image of concrete beam using trained Faster R-CNN model.
