Aiming at the problem of low accuracy of traditional target detection methods for target detection in endoscopes in substation environments, a CNN-based real-time detection method for masked targets is proposed. The m...Aiming at the problem of low accuracy of traditional target detection methods for target detection in endoscopes in substation environments, a CNN-based real-time detection method for masked targets is proposed. The method adopts the overall design of backbone network, detection network and algorithmic parameter optimisation method, completes the model training on the self-constructed occlusion target dataset, and adopts the multi-scale perception method for target detection. The HNM algorithm is used to screen positive and negative samples during the training process, and the NMS algorithm is used to post-process the prediction results during the detection process to improve the detection efficiency. After experimental validation, the obtained model has the multi-class average predicted value (mAP) of the dataset. It has general advantages over traditional target detection methods. The detection time of a single target on FDDB dataset is 39 ms, which can meet the need of real-time target detection. In addition, the project team has successfully deployed the method into substations and put it into use in many places in Beijing, which is important for achieving the anomaly of occlusion target detection.展开更多
The radiometric calibration of remote sensors is a basis and prerequisite of information quantification in remote sensing. This paper proposes a method for outdoor relative radiometric calibration using gray scale tar...The radiometric calibration of remote sensors is a basis and prerequisite of information quantification in remote sensing. This paper proposes a method for outdoor relative radiometric calibration using gray scale targets. In this method, the idea of two substitutions is adopted. Sunlight is used to replace the integrating sphere light source, and gray scale targets are used to re-place the diffuser. In this way, images at different radiance levels obtained outdoors can calculate the relative radiometric cali-bration coefficients using the least square method. The characteristics of this method are as follows. Firstly, compared with la-boratory calibration, it greatly reduces the complexity of the calibration method and the test cost. Secondly, compared with the existing outdoor relative radiometric calibration of a single radiance level, it uses test images of different radiance levels to re-duce errors. Thirdly, it is easy to operate with fewer environmental requirements, has obvious advantages in the rapid calibra-tion of airborne remote sensors before or after flight and is practical in engineering. This paper theoretically and experimental-ly proves the feasibility of this method. Calibration experiments were conducted on the wide-view multispectral imager (WVMI) using this method, and the precision of this method was evaluated by analyzing the corrected images of large uniform targets on ground. The experiment results have demonstrated that the new method is effective and its precision meets the re-quirement of the absolute radiometric calibration.展开更多
On the basis of scale invariant feature transform（SIFT） descriptors,a novel kind of local invariants based on SIFT sequence scale（SIFT-SS） is proposed and applied to target classification.First of all,the merits o...On the basis of scale invariant feature transform（SIFT） descriptors,a novel kind of local invariants based on SIFT sequence scale（SIFT-SS） is proposed and applied to target classification.First of all,the merits of using an SIFT algorithm for target classification are discussed.Secondly,the scales of SIFT descriptors are sorted by descending as SIFT-SS,which is sent to a support vector machine（SVM） with radial based function（RBF） kernel in order to train SVM classifier,which will be used for achieving target classification.Experimental results indicate that the SIFT-SS algorithm is efficient for target classification and can obtain a higher recognition rate than affine moment invariants（AMI） and multi-scale auto-convolution（MSA） in some complex situations,such as the situation with the existence of noises and occlusions.Moreover,the computational time of SIFT-SS is shorter than MSA and longer than AMI.展开更多
[目的/意义]借助智能化识别及图像处理等技术来实现对移栽后蔬菜状态的识别和分析,将会极大提高识别效率。为了实现甘蓝大田移栽情况的实时监测和统计,提高甘蓝移栽后的成活率以及制定后续工作方案,减少人力和物力的浪费,研究一种自然...[目的/意义]借助智能化识别及图像处理等技术来实现对移栽后蔬菜状态的识别和分析,将会极大提高识别效率。为了实现甘蓝大田移栽情况的实时监测和统计,提高甘蓝移栽后的成活率以及制定后续工作方案,减少人力和物力的浪费,研究一种自然环境下高效识别甘蓝移栽状态的算法。[方法]采集移栽后的甘蓝图像,利用数据增强方式对数据进行处理,输入YOLOv8s(You Only Look Once Version 8s)算法中进行识别,通过结合可变形卷积,提高算法特征提取和目标定位能力,捕获更多有用的目标信息,提高对目标的识别效果;通过嵌入多尺度注意力机制,降低背景因素干扰,增加算法对目标区域的关注,提高模型对不同尺寸的甘蓝的检测能力,降低漏检率;通过引入Focal-EIoU Loss(Focal Extended Intersection over Union Loss),优化算法定位精度,提高算法的收敛速度和定位精度。[结果和讨论]提出的算法经过测试,对甘蓝移栽状态的召回率R值和平均精度均值(Mean Average Precision,mAP)分别达到92.2%和96.2%,传输速率为146帧/s,可满足实际甘蓝移栽工作对移栽状态识别精度和速度的要求。[结论]提出的甘蓝移栽状态检测方法能够实现对甘蓝移栽状态识别的准确识别,可以提升移栽质量测量效率,减少时间和人力投入,提高大田移栽质量调查的自动化程度。展开更多
文摘Aiming at the problem of low accuracy of traditional target detection methods for target detection in endoscopes in substation environments, a CNN-based real-time detection method for masked targets is proposed. The method adopts the overall design of backbone network, detection network and algorithmic parameter optimisation method, completes the model training on the self-constructed occlusion target dataset, and adopts the multi-scale perception method for target detection. The HNM algorithm is used to screen positive and negative samples during the training process, and the NMS algorithm is used to post-process the prediction results during the detection process to improve the detection efficiency. After experimental validation, the obtained model has the multi-class average predicted value (mAP) of the dataset. It has general advantages over traditional target detection methods. The detection time of a single target on FDDB dataset is 39 ms, which can meet the need of real-time target detection. In addition, the project team has successfully deployed the method into substations and put it into use in many places in Beijing, which is important for achieving the anomaly of occlusion target detection.
基金supported by the National Natural Science Foundation of China(Grant No.11174017)the National High Technology Research and Development Program of China("863" Program)(Grant No.2008AA121806)
文摘The radiometric calibration of remote sensors is a basis and prerequisite of information quantification in remote sensing. This paper proposes a method for outdoor relative radiometric calibration using gray scale targets. In this method, the idea of two substitutions is adopted. Sunlight is used to replace the integrating sphere light source, and gray scale targets are used to re-place the diffuser. In this way, images at different radiance levels obtained outdoors can calculate the relative radiometric cali-bration coefficients using the least square method. The characteristics of this method are as follows. Firstly, compared with la-boratory calibration, it greatly reduces the complexity of the calibration method and the test cost. Secondly, compared with the existing outdoor relative radiometric calibration of a single radiance level, it uses test images of different radiance levels to re-duce errors. Thirdly, it is easy to operate with fewer environmental requirements, has obvious advantages in the rapid calibra-tion of airborne remote sensors before or after flight and is practical in engineering. This paper theoretically and experimental-ly proves the feasibility of this method. Calibration experiments were conducted on the wide-view multispectral imager (WVMI) using this method, and the precision of this method was evaluated by analyzing the corrected images of large uniform targets on ground. The experiment results have demonstrated that the new method is effective and its precision meets the re-quirement of the absolute radiometric calibration.
基金supported by the National High Technology Research and Development Program (863 Program) (2010AA7080302)
文摘On the basis of scale invariant feature transform（SIFT） descriptors,a novel kind of local invariants based on SIFT sequence scale（SIFT-SS） is proposed and applied to target classification.First of all,the merits of using an SIFT algorithm for target classification are discussed.Secondly,the scales of SIFT descriptors are sorted by descending as SIFT-SS,which is sent to a support vector machine（SVM） with radial based function（RBF） kernel in order to train SVM classifier,which will be used for achieving target classification.Experimental results indicate that the SIFT-SS algorithm is efficient for target classification and can obtain a higher recognition rate than affine moment invariants（AMI） and multi-scale auto-convolution（MSA） in some complex situations,such as the situation with the existence of noises and occlusions.Moreover,the computational time of SIFT-SS is shorter than MSA and longer than AMI.
文摘[目的/意义]借助智能化识别及图像处理等技术来实现对移栽后蔬菜状态的识别和分析,将会极大提高识别效率。为了实现甘蓝大田移栽情况的实时监测和统计,提高甘蓝移栽后的成活率以及制定后续工作方案,减少人力和物力的浪费,研究一种自然环境下高效识别甘蓝移栽状态的算法。[方法]采集移栽后的甘蓝图像,利用数据增强方式对数据进行处理,输入YOLOv8s(You Only Look Once Version 8s)算法中进行识别,通过结合可变形卷积,提高算法特征提取和目标定位能力,捕获更多有用的目标信息,提高对目标的识别效果;通过嵌入多尺度注意力机制,降低背景因素干扰,增加算法对目标区域的关注,提高模型对不同尺寸的甘蓝的检测能力,降低漏检率;通过引入Focal-EIoU Loss(Focal Extended Intersection over Union Loss),优化算法定位精度,提高算法的收敛速度和定位精度。[结果和讨论]提出的算法经过测试,对甘蓝移栽状态的召回率R值和平均精度均值(Mean Average Precision,mAP)分别达到92.2%和96.2%,传输速率为146帧/s,可满足实际甘蓝移栽工作对移栽状态识别精度和速度的要求。[结论]提出的甘蓝移栽状态检测方法能够实现对甘蓝移栽状态识别的准确识别,可以提升移栽质量测量效率,减少时间和人力投入,提高大田移栽质量调查的自动化程度。
