Copper frame diameters leave the caliper behind: zero-shot segmentation plus adaptive edges hold five new frames to 2.4–6.3 µm
Diameter inspection of CuCrZr frames for the Beijing Huairou High Energy Photon Source moves to a fully automatic vision pipeline: SAM3 extracts the target region without training, SAM-Canny adaptively picks the dilation kernel and Canny thresholds, and a WOA-RBF network compensates illumination-induced bias from grayscale features of different material regions. On five unseen frames the algorithm held errors to 2.4–6.3 µm, while manual micrometer measurement reached 32.1 µm.