12/24/2022 0 Comments Point cloud convex hull scilab![]() ![]() Multi-scale registration point cloud alignment point cloud registration point cloud watermarking remote sensing. However, this issue is common to the other state-of-the-art approaches. The most dangerous is an attack with noise that can be handled only to some extent. Convex hull: Computes the volume of the minimal convex enclosing. ![]() The extensive experiments confirmed that the proposed approach resists the affine transformation, cropping, random point removal, and various combinations of these attacks. 3Depict is designed purely for post-processing of 3D point data. A convex hull point co-ordinate file is then created using writeconvexhullxy() ''' if os. ![]() The watermark can then be extracted from the watermarked point cloud easily. import os import sys import numpy as np from scipy import spatial def xyconvexhull (inputxyfile): ''' Calculates the convex hull of a given xy data set returning the indicies of the convex hull points in the input data set. An iterative closest point algorithm is performed after that to align the attacked watermarked point cloud to the original one completely. The scale and the initial rigid affine transformation between the watermarked and the original point cloud can be estimated in this way to obtain a coarse point cloud registration. A point cloud registration technique is developed, based on a 3D convex hull. In this work, an alternative approach is proposed that solves these issues efficiently. Unfortunately, they fail in the case of cropping and random point removal attacks. A convex hull point co-ordinate file is then created using writeconvexhullxy () ''' if os.path.isfile(inputxyfile): print 'Loading file.' xyfile np.loadtxt(inputxyfile, usecols (0,1)) else: sys.exit('File for convex hull calculation doesn't exist') print 'Calculating hull points. Most 3D point cloud watermarking techniques apply Principal Component Analysis (PCA) to protect the watermark against affine transformation attacks. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |