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Author: Admin | 2025-04-28
Right arch bottoms of the tunnel, at a fixed distance from the track surface. Only the sub-images at this location are used for prediction, thus effectively reducing the number of false positives caused by the metal supports of the fixed cables. In the mileage direction, the targets are separated by a certain distance, and the distance between two successive bounding boxes will be traversed sequentially. If it is less than a certain distance, it will be considered as a false detection for removal, thus effectively reducing the false positives caused by other inner-wall accessories of the tunnel.The square target was divided into four areas and distinguished by different colors, as shown in Figure 11a. The pixel values of the target in the image are different and show certain rules, as depicted in Figure 11b. Taking the center of the bounding box as the reference, eight rows of pixels were taken from top to bottom, and eight columns of pixels from left to right; the average pixel value a v g of the entire area and the average pixel values a v g 1 , a v g 2 , a v g 3 , a v g 4 of the four sub-areas were calculated. If the rules a v g 1 a v g , a v g 4 a v g , a v g 2 > a v g , and a v g 3 > a v g were satisfied, the result was determined to be correct.
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