Point clouds

Part 2 of ebook "Statistics and analysis of shapes" provides readers with contents including: on the representation of shapes using implicit functions; computing with point cloud data; determining intrinsic dimension and entropy of high-dimensional shape spaces; object-image metrics for generalized weak perspective projection; wulff shapes at zero temperature for some models used in image processing;...

222p mothoiphong 28-06-2024 1 1   Download

Part 2 book "Computer aided engineering design" includes content: Differential geometry of surfaces, design of surfaces, solid modeling, computations for geometric design, geometric modeling using point clouds, finite element method, optimization.

228p dianmotminh00 22-04-2024 3 2   Download

This paper presents the application of TLS for the assessment of the bearing capacity of the newly built bridges before being put into operation. The process of collecting and processing point cloud data and analyzing bridge deflection during static load testing is mentioned in the article systematically and completely.

12p viohoyo 25-04-2024 5 2   Download

Ebook "Smart nanohybrids of RAFT polymers and inorganic particles" offer a comprehensive introduction to basics of polymer science and the applied methodologies. In following chapters, the author describes in detail how he systematically tailored the polymers using reversible addition-fragmentation chain transfer polymerization (RAFT) for combination with inorganic nanoparticles.

311p tracanhphuonghoa1007 22-04-2024 6 3   Download

The study "Three-dimensional building model using drone point clouds" primarily outlines the theory of high-resolution aerial mapping for 3D construction using drone point clouds of the Provincial Hall in Chiang Rai Province, in northern Thailand. The use of geographic information systems (GIS) to support and convey information to environmental managers and the general public is excellent for presenting data obtained from ongoing location monitoring.

10p tukhauquantuong1011 22-04-2024 4 2   Download

In the study "Building a 3D information model for underground coal mines" a 3D information model for a mine is built using BIM. The Industry Foundation Classes (IFC) standard is used to define the mining information model. Point clouds collected by Terrestrial laser scanning (TLS) provide geometric and attributive information for building BIM models. This information model was applied to the NUI BEO underground coal mine. The information model was built for important structures of the mine, including the mine shaft and tunnels.

15p tukhauquantuong1011 22-04-2024 2 2   Download

Luận văn "Trình diễn và tương tác mô hình 3D Mộc bản trên nền Web" này nghiên cứu xây dựng hệ thống Web biểu diễn các dữ liệu 3D point cloud lớn của Mộc bản, cho phép người dùng xem các tập dữ liệu với hàng tỷ điểm trong thời gian thực trên các trình duyệt Web tiêu chuẩn, một trong những ưu điểm chính của việc “trình diễn và tương tác với mô hình 3D Mộc bản trên nền Web” là giúp người xem không cần phải cài đặt phần mềm hiển thị 3D, giúp các nhà bảo tồn văn hóa đưa được các tư liệu quý giá đến cho công chúng một cách phổ biến hơn mà vẫn đảm bảo được an toàn an ninh cho dữ liệu gốc.

72p khanhchi0912 12-04-2024 3 1   Download

Ebook "Advances in dye removal technologies" describes the various advanced treatment methods for removal of multiple types of dyes from effluent stream. It pays particular attention to the economic aspects of treatment of textile waste-water. The different technologies illustrated in the book include adsorption, nanofiltration, advanced oxidation, micellar enhanced ultrafiltration, cloud-point extraction, and electrocoagulation.

350p lamquandat 28-12-2023 3 2   Download

In particular, we evaluated the entire FPHA dataset with five different sampling configurations. The results show that 3D distance error is increased many times compared to estimates on the hand datasets are not obstructed (the hand data obtained from surveillance cameras, are viewed from top view, front view, sides view) such as MSRA, NYU, ICVL datasets. The results are quantified, analyzed, shown on the point cloud data of CVAR dataset and projected on the color image of FPHA dataset.

12p visystrom 22-11-2023 10 8   Download

Continued part 1, part 2 of ebook "Three.js cookbook" provides readers with contents including: chapter 4 - materials and textures; chapter 5 - lights and custom shaders; chapter 6 - point clouds and postprocessing; chapter 7 - animation and physics;...

155p tieulangtran 28-09-2023 7 3   Download

Ebook Complex Analysis and Differential Geometry: Part 2 presents the following content: Tensor Fields in Curvilinear Coordinates; New Spherical Indicatrices and their Characterizations; Developable Surface Fitting to Point Clouds; Local Intrinsic Geometry of Surfaces; Geodesic Curvature and Christoffel Symbols;...Please refer to the documentation for more details.

223p chankora 16-06-2023 6 1   Download

This research proposes an application of a RGB Depth (RGB-D) camera system in 3D indoor mapping. In order to reconstruct the 3D model of an indoor space where the robot is located, the RGB-D camera system is installed in the robot frame to continuously capture the separated 2D image frames.

9p vidoctorstrange 06-05-2023 7 4   Download

In this paper, we introduce a simple and real-time approach for 3D environment reconstruction from data obtained from cheap cameras. The implementation is detailed step by step and illustrated with source code. Simultaneously, cameras that support reconstructing 3D environments in this approach are also presented and introduced.

11p viharry 15-12-2022 4 4   Download

This paper presents the results of applying UAV and Terrestrial laser scanners to model the architectural heritage in 3D with high quality for the purpose of preserving and protecting these works.

9p vibentley 08-09-2022 9 4   Download

Bài viết trình bày một phương pháp để thể hiện và tùy chỉnh 3D Point cloud lên nền web thông qua nền tảng mã nguồn mở Potree. Giải pháp này đã mang đến lợi ích to lớn đối với người dùng vì giúp tương tác trực tuyến, đa thiết bị và trực quan phục vụ công tác thiết kế quy hoạch và cảnh quan.

9p viginnirometty 04-05-2022 18 3   Download

Bài viết thực hiện đánh giá và so sánh các giải thuật ICP - Iterative Closest Point được sử dụng để xây dựng mô hình 3D từ tập dữ liệu Point Cloud Data - PCD thu được từ camera LiDAR sau những lần quét liên tiếp nhau. Ba giải thuật gồm ICP gốc, ICP k-d tree, ICP ak-d tree được đánh giá, so sánh dựa trên các thông số là sai số và tổng thời gian chạy giải thuật. Kết quả cho thấy giải thuật ICP k-d tree và ak-d tree thực hiện cho tổng thời gian thực hiện ít hơn 10 lần, với độ chính xác cao hơn 20 lần so với giải thuật ICP gốc.

5p wangziyi_1307 26-04-2022 20 1   Download

Cloud point extraction (CPE), which is the most popular coacervate-based extraction method, was utilized for the separation and preconcentration of trace amounts of cadmium, lead, and nickel. Quinalizarin was used as complexing agent and Triton X-114 was used as surfactant. After extraction, analyte ions were determined by flame atomic absorption spectrometry. The detection limits (3 s) of 1.8 µg L −1 for Cd(II), 3.2 µg L −1 for Pb(II), and 2.8 µg L −1 for Ni(II) were obtained using 50 mL of solutions.

9p langthannam 29-12-2021 13 0   Download

In the current study, a simple and efficient analytical method for preconcentration and determination of Cd(II), Pb(II), and Sn(II) in some cosmetic samples, using ultrasonic assisted-cloud point extraction and flame atomic absorption spectrometry, was developed. The method is based on the ternary complex formations of Sn(II), Pb(II), and Cd(II), which are available in the form of neutral and/or anionic hydroxo complexes (Sn(OH)−3, Pb(OH)−3, Cd(OH)2, and/or Cd(OH)−3), with Victoria Pure Blue BO (VPB +) in the presence of cetylpyridinium chloride at pH 8.

14p langthannam 29-12-2021 8 0   Download

A new system was developed for the preconcentration and determination of cadmium levels in water following online cloud-point extraction and analysis by flame atomic absorption spectrometry. The method uses cloud-point extraction of the complex formed between Cd(II) ions and the reagent 2-(5-bromo-2’-thiazolylazo)- p-cresol (Br-TAC) using Triton X-114 as a surfactant. The main steps of the procedure, extraction, filtration, and detection were conducted online.

9p langthannam 29-12-2021 7 0   Download

Carmoisine (E122) is a synthetic azo dye that is generally used to give a red color to food products. In this work, a sensitive and simple method was developed for the determination of carmoisine based on cloud point extraction. To obtain the optimum conditions for the extraction efficiency of carmoisine, the effects of different analytical parameters such as H2 SO4 concentration, concentration of Triton X-114, and equilibrium temperature were studied. The calibration graph was linear between 0.05 and 5.

7p langthannam 29-12-2021 9 1   Download