基于改进YOLO11n的刮板输送机大块煤跟踪检测方法

Tracking and detection method for large coal blocks on scraper conveyors based on improved YOLO11n

  • 摘要: 大块煤拥堵是导致综采工作面刮板输送机机头转载口堵塞的主要原因之一,及时精准地破除大块煤对保证综采工作面煤流顺畅至关重要。针对大块煤因短时遮挡及姿态变化导致检测精度低,进而造成破碎机器人无法对其准确破除的问题,提出一种基于改进YOLO11n的刮板输送机大块煤跟踪检测模型−DAMP−YOLO11n−BT。采用DCSNet模块替换YOLO11n原始模型的骨干网络,在保证模型检测精度的同时,降低模型的浮点运算量;采用AG−SPPF模块提升模型对刮板输送机煤流区域全局背景信息和块煤局部关键信息的关注和光照不均等环境抗干扰能力;引入Powerful−IoU(PIoU),通过自适应惩罚与梯度调节优化边界框回归,强化对中等质量锚框的聚焦,增强对块煤密集场景下的大块煤检测能力;融合DAMP−YOLO11n模型与ByteTrack算法,提出DAMP−YOLO11n−BT模型,实现大块煤的跟踪检测。利用现场采集的刮板输送机大块煤检测数据集进行实验验证,结果表明:① DAMP−YOLO11n模型的准确率、mAP@0.5:0.95与召回率分别为86.3%,77.6%,85.5%,较原始模型YOLO11n分别提升2.4%,2.4%,3.2%;其参数量为1.95×106个,浮点运算量为4.8×109,模型大小为4.09 MiB,较原始模型YOLO11n分别下降24.4%,23.8%和23.6%;检测速度为351帧/s,满足检测实时性要求。② DAMP−YOLO11n−BT对大块煤跟踪识别的多目标跟踪准确率、多目标跟踪精度、ID调和均值分别为76.6%,74.5%和75.2%,均优于YOLO11n−BT,解决了被遮挡大块煤的漏检和ID跳变问题,满足破碎机器人精准作业的跟踪需求。

     

    Abstract: Large coal block accumulation is one of the main causes of blockage at the head transfer point of the scraper conveyor in a fully mechanized mining face. Timely and accurate breaking of large coal blocks is crucial for ensuring smooth coal flow in the fully mechanized mining face. However, short-term occlusion and posture changes of large coal blocks lead to low detection accuracy, which further prevents the crushing robot from accurately breaking them. To address this problem, a tracking and detection model for large coal blocks on a scraper conveyor named DAMP-YOLO11n-BT based on YOLO11n was proposed. The DCSNet module was used to replace the backbone network of the original YOLO11n model, which reduced the floating-point operations of the model while maintaining detection accuracy. The AG-SPPF module was adopted to enhance the model’s attention to the global background information of the coal flow region of the scraper conveyor and the local key information of coal blocks, and to improve its anti-interference capability under uneven illumination and other environmental conditions. Powerful-IoU (PIoU) was introduced to optimize bounding box regression through adaptive penalty and gradient adjustment, strengthen the focus on medium-quality anchor boxes, and enhance the detection capability for large coal blocks in dense coal block scenes. By integrating the DAMP-YOLO11n model with the ByteTrack algorithm, the DAMP-YOLO11n-BT model was proposed to realize the tracking and detection of large coal blocks. Experiments were conducted using a large coal block detection dataset of scraper conveyors collected on site. The results showed that: ① the accuracy, mAP@0.5∶0.95, and recall of the proposed DAMP-YOLO11n model were 86.3%, 77.6%, and 85.5%, respectively, which were improved by 2.4%, 2.4%, and 3.2%, respectively, compared with the original YOLO11n model. The number of parameters, floating-point operations, and model size were 1.95×106, 4.8×109, and 4.09 MiB, which were reduced by 24.4%, 23.8%, and 23.6%, respectively, compared with the original YOLO11n model. The detection speed reached 351 frames/s, which met the real-time detection requirement. ② The multiple object tracking accuracy, multiple object tracking precision, and ID F1 score of DAMP-YOLO11n-BT for large coal block tracking and detection were 76.6%, 74.5%, and 75.2%, respectively, all of which were better than those of YOLO11n-BT. The proposed method solves the problems of missed detection and ID switching of occluded large coal blocks and meets the tracking requirements for precise operation of the crushing robot.

     

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