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    • 摘要: 针对X射线安检图像中样本重叠遮挡占比高、关键特征提取困难、背景噪声大导致的漏检和误检问题,提出一种自适应全景聚焦X射线图像违禁品检测算法。首先,设计前景特征感知模块,通过强化前景目标的边缘结构和纹理细节,精准区分违禁品和背景噪声,提高特征表达的准确性和完整性。然后,结合多分支结构和双重交叉注意力机制构造多路径双维信息整合模块,优化通道和空间维度的特征交互与融合,加强关键特征的提取能力,有效抑制背景干扰。最后,构建全景动态聚焦检测头,通过频率自适应空洞卷积实现感受野的动态调整,以适配小尺寸违禁品目标的特征频率分布,增强模型对小目标的识别能力。在公开数据集SIXray和OPIXray上进行训练和测试,mAP@0.5分别达到93.3%和92.5%,优于其他对比算法。实验结果表明,该模型显著改善了X射线图像中违禁品的漏检和误检情况,具有较高的准确性和鲁棒性。

       

      Abstract: Aiming at the problem of leakage and misdetection caused by the high percentage of sample overlapping and occlusion, the difficulty of key feature extraction, and the large background noise in X-ray security images, an adaptive panoramic focusing X-ray image contraband detection algorithm is proposed. Firstly, the foreground feature awareness module is designed to accurately distinguish contraband and background noise by enhancing the edge structure and texture details of the foreground target to improve the accuracy and completeness of feature representation. Then, the multi-path two-dimensional information integration module is constructed by combining the multi-branch structure and dual cross attention mechanism to optimize the feature interaction and fusion in the channel and spatial dimensions, to strengthen the extraction capability of key features, and to effectively suppress the background interference. Finally, a panoramic dynamic focus detection head is constructed, which dynamically adjusts the receptive field through frequency adaptive dilated convolutions to accommodate the feature frequency distribution of small-sized contraband targets, thereby enhancing the model's ability to recognize small targets. Trained and tested on the public datasets SIXray and OPIXray, the mAP@0.5 reaches 93.3% and 92.5%, respectively, outperforming the other compared algorithms. The experimental results show that the proposed model significantly improves the leakage and false detection of contraband in X-ray images with high accuracy and robustness.