共查询到17条相似文献,搜索用时 400 毫秒
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为了避免点云在人工去噪时的复杂工作流程,进一步提高点云去噪效率,在相关研究基础上,设计了一种基于混合滤波和空间密度聚类的点云去噪算法。首先,通过直通滤波去除点云的无效点;其次,采用统计滤波删除点云的大尺度噪声点;再次,利用空间密度聚类算法移除点云的小尺度噪声点。最后,通过相关点云测量数据对设计的算法进行仿真实验验证,并与传统点云去噪算法的计算结果进行对比分析。结果表明,所设计的算法去噪效果优于传统点云去噪算法。 相似文献
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针对环扫声呐扫描结果受到排水管道内混合水声的影响问题,提出一种声呐扫描点云数据去噪的方法:在环扫声呐扫描得到的三维点云数据基础上,通过密度聚类优化算法,去除点云数据中的噪声,然后采用类圆外切线斜率拟合的方式,识别出管道内壁界限和淤泥淤积线,最终得出包含排水管道内壁界限和淤积线特征的模型。为验证有效性,以武汉市某排水管道为例进行分析,基于现场采集的98万个点云坐标进行数据去噪和特征提取,结果表明:采用密度聚类优化算法进行点云数据初筛后,通过圆外切线斜率拟合算法能有效识别出排水管道内壁界限和淤积线,拟合半径均方误差0.0071m,相较于单一密度聚类算法拟合精度更高,去噪效果更好。 相似文献
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基于双边滤波的自适应彩色图像去噪研究 总被引:1,自引:0,他引:1
目的为了克服彩色图像去噪后存在的特征模糊,研究基于双边滤波的自适应彩色噪声图像去噪方法。方法使用二维离散小波变换(DWT)对含噪声的彩图图像进行近似分量、水平细节分量、垂直细节分量和对角细节分量等4个方向的分解。根据DWT各方向分量归一化后的方差比例,利用RBF神经网络构造双边滤波系数模型确定不同方向的最佳去噪系数,提出彩色噪声图像自适应去噪方法(DWT-ABF),并将该方法与常规方法作对比。结果在不同噪声类型以及混合噪声失真情况下文中方法都能有效地去除噪声,并同时保留图像细节信息,且与其他方法相比,文中方法去噪后的图像都具有更高的PSNR值。结论文中方法克服了传统双边滤波无法自行确定最佳参数的缺陷,同时也良好地解决了去噪图像特征模糊的问题。 相似文献
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Abstract Techniques for extracting data from LiDAR point clouds can be refined for increased accuracy. In this paper, the authors elaborate on an innovative approach for registering ground‐based LiDAR point clouds using overlapping scans based on 3D line features. The proposed working scheme consists of three major kernels: a 3D line feature extractor, a 3D line feature matching mechanism, and a mathematical model for simultaneously registering ground‐based LiDAR point clouds of multi‐scans on a 3D line feature basis. All processing chains in this study are featured efficiently and come close to meeting the needs of practical usage. Experiments conducted show the proposed method of employing 3D line features to be a useful alternative or complement to point, surface and other features for LiDAR (Light Detection And Ranging) point clouds registration. It is especially effective in areas rich in man‐made structures. 相似文献
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Byung-In Kim 《国际生产研究杂志》2013,51(7):2165-2167
Blades play an important role in aviation engine, gas turbine and jet engine. Inspecting the blade by optical method is a meaningful work in manufacturing industry. During optical inspecting process, one common problem encountered is that the scanned point cloud is large scale and noisy. In this paper, we present a systematic introduction of simplification, smoothing and parameter extraction with respect to point-sampled blades. First, the moving least square surface is applied to create a geometric deviation, which is used to subdivide and cluster the point cloud. Then, the information entropy in k-neighbourhood is defined to smooth point-sampled surface, meanwhile preserving high curvature feature. Furthermore, the computation method of single/multi section parameters is presented, and test experiments are performed in iCloud3D Blade V1.0. Experimental results demonstrate the feasibility and effectiveness of the proposed method. 相似文献
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Traditional three-dimensional (3D) image reconstruction method, which highly dependent on the environment and has poor reconstruction effect, is easy to lead to mismatch and poor real-time performance. The accuracy of feature extraction from multiple images affects the reliability and real-time performance of 3D reconstruction technology. To solve the problem, a multi-view image 3D reconstruction algorithm based on self-encoding convolutional neural network is proposed in this paper. The algorithm first extracts the feature information of multiple two-dimensional (2D) images based on scale and rotation invariance parameters of Scale-invariant feature transform (SIFT) operator. Secondly, self-encoding learning neural network is introduced into the feature refinement process to take full advantage of its feature extraction ability. Then, Fish-Net is used to replace the U-Net structure inside the self-encoding network to improve gradient propagation between U-Net structures, and Generative Adversarial Networks (GAN) loss function is used to replace mean square error (MSE) to better express image features, discarding useless features to obtain effective image features. Finally, an incremental structure from motion (SFM) algorithm is performed to calculate rotation matrix and translation vector of the camera, and the feature points are triangulated to obtain a sparse spatial point cloud, and meshlab software is used to display the results. Simulation experiments show that compared with the traditional method, the image feature extraction method proposed in this paper can significantly improve the rendering effect of 3D point cloud, with an accuracy rate of 92.5% and a reconstruction complete rate of 83.6%. 相似文献