The existing eye location algorithms have some disadvantages of single task and performance degrade in complex environment such as illumination, glasses and occlusion, so a multi- efficient, light-YOLO and lightweight neural network, MEL-YOLO, is designed for obtaining eye multi-attributes and landmarks. Based on the YOLOV3 network, combining with the enhanced DS-sandglass block, a denormalized coding and encoding method is used in the regression branch of key points to promote the network positioning depth, and the complete intersection-over-union (CIoU) and the mean square error (MSE) are introduced into the loss function, so promoting the overall performance of the network. On the near-infrared dataset, the MEL-YOLO network achieves the position accuracy of 100%, and achieves the attribute recognition rate and the landmark accuracy rate of 98.7% and 96.5%, while reaches 92% and 91% on the UBIRS dataset. The experimental results demonstrate that the MEL-YOLO network can accurately obtain eye multi-attributes and key point information. Also, it is proved that MEL-YOLO is small and robust, and has the firm generalization ability, thus applying to low-performance edge computing devices.
表 6 不同编码方式的实验结果结果Table 6 Results of different encoding methods
表 4 整体和每类关键点定位情况Table 4 Position about key points of overall and each category
表 3 不同IoU下区域测试准确率Table 3 Testing accuracy under different IoUs
表 2 数据集构成Table 2 Dataset composition
表 7 消融实验结果Table 7 Results of ablation study
表 1 特征提取网络结构Table 1 Network structure of feature extraction
表 8 不同方法的计算量和性能Table 8 FLOPs and peformance of different methods
图1 虹膜(眼周)识别系统Fig.1 System of iris (periocular) recognition
图2 MEL-YOLO网络输出结构Fig.2 Output structure of MEL-YOLO Network
图3 先验框示意图Fig.3 Diagram of bounding box
图4 Sandglass模块和DS-sandglass模块Fig.4 Sandglass block and DS-sandglass block
图5 MEL-YOLO网络整体结构图Fig.5 Overall structure diagram of MEL-YOLO network
图6 眼睛标注细节信息Fig.6 Eye label details
图7 精确率-召回率曲线Fig.7 Precison-recall curve
图8 MEL-YOLO 网络测试效果Fig.8 MEL-YOLO network test results
图9 UBIRIS标注细节信息Fig.9 UBIRIS label details
图10 UBIRIS数据集测试效果Fig.10 UBIRIS dataset test results
表 5 不同输入尺寸的实验结果Table 5 Results of different input sizes