How to check the Levelling dots for plastering work on masonry walls by using Point cloud?

13 March 2023 1 4K Report

Hello. I’m a Civil Engineering student. Currently, I am doing my Master Thesis related with quality inspection. I would like to know how to check the leveling dots for plastering work on masonry walls by using Point cloud which means that “before the plastering work starts on site, we just need to do the leveling along the walls to make sure how much the plastering thickness should be for that wall. So, we need to check these plastering thickness dots which is leveling or not.” I am going to use 3D laser scanner and using MATLAB for programming. So, I would like to get some suggestions related with that issue. (You can see the below attached file as an example)

Saad Hameed Abid

To check the leveling dots for plastering work on masonry walls using a 3D laser scanner and MATLAB, you can follow these general steps:

Acquire a point cloud of the wall: Use the 3D laser scanner to capture a point cloud of the masonry wall, including the leveling dots.

Import the point cloud into MATLAB: Use MATLAB's point cloud processing tools to import the point cloud data into MATLAB.

Segment the point cloud: Use MATLAB's point cloud processing tools to segment the point cloud data and extract only the points corresponding to the leveling dots.

Estimate the surface of the wall: Use MATLAB's point cloud processing tools to estimate the surface of the wall based on the remaining points in the point cloud.

Compare the leveling dots to the estimated wall surface: Use MATLAB to calculate the distance between each leveling dot and the estimated surface of the wall. If the distance is within a certain tolerance, the leveling dot is considered to be level.

Visualize the results: Use MATLAB's visualization tools to create a 3D model of the wall and the leveling dots, with color coding to indicate which dots are level and which are not.

Adjust the plaster thickness: Use the information from the analysis to adjust the plaster thickness as needed to ensure a level finish.

Here are some specific suggestions for each of these steps:

Acquire a point cloud of the wall: Ensure that the laser scanner is positioned correctly and that the entire wall is scanned, including the leveling dots. Use a high-quality scanner to ensure accurate data capture.

Import the point cloud into MATLAB: Use MATLAB's pointCloud function to import the point cloud data into MATLAB.

Segment the point cloud: Use MATLAB's findNeighborsInRadius function to identify the points corresponding to the leveling dots, based on their known locations.

Estimate the surface of the wall: Use MATLAB's pcfitplane function to estimate the surface of the wall based on the remaining points in the point cloud.

Compare the leveling dots to the estimated wall surface: Use MATLAB's pdist2 function to calculate the distance between each leveling dot and the estimated surface of the wall. Choose a tolerance level that is appropriate for your application.

Visualize the results: Use MATLAB's plot3 function to create a 3D model of the wall and the leveling dots, with color coding to indicate which dots are level and which are not. You may also want to use MATLAB's patch function to create a 3D mesh representation of the wall surface.

Adjust the plaster thickness: Use the information from the analysis to adjust the plaster thickness as needed to ensure a level finish. This may involve additional iterations of scanning and analysis, depending on the complexity of the wall geometry and the required level of accuracy.

Hope it helps

Badges
Science topic

More Smithz John's questions See All

What software programs can directly simulate Additive Manufacturing Directed Energy Deposition (DED)?

I understand there are a lot of software programs that can simulate DED by going through specific modeling, simulation, and commands. For me, that was time consuming and results were not accurate....

24 February 2021 4,428 3 View

What is the minimum number of studies in each category required for a multiple subgroup analysis to be viable in a meta-analysis?

Cochrane Handbook mentions subgroup analyses are only warranted if there are more than 10 studies (I have 28), and if they are distributed evenly among categories of subgroup. I am wondering if...

17 February 2021 3,467 4 View

How do you interpret multiple meta-regression in STATA?

Please could someone recommend a resource that explains performing meta-regression with multiple moderators. I have read the STATA META ANALYSIS REFERENCE MANUAL, but this only gives examples of...

17 February 2021 7,376 1 View

How many indicators do I need to represent a latent construct?

Hi folks! We did a large survey and planned to use 3 indicators to represent a latent construct (Sense of Place/SoP) in a latent regression model (structural equation modeling). However, one of...

15 February 2021 7,705 3 View

What is the structure of a photon that can describe the interference experiments that reject the wave nature of light?

De Broglie's double-solution postulated a causal model of Quantum Mechanics. Knowledge of the photon structure was needed to model the particle part of the cause of the Double Slit interference...

11 February 2021 6,869 5 View

How do you incorporate a study that used non-parametric analysis into a meta-analysis where majority of studies used parametric?

I am calculating Hedge's g for effect sizes, so I am pulling means, SDs, and Ns, from each study. However, one study did a Mann-Whitney U test, and so reports Mean Rank, Sum of Ranks, U, Z, and r...

31 January 2021 1,182 5 View

How to share a struct between client.c and server.c in Contiki RPL UDP ?

I'm trying to include udp-client.c in udp-server.c to share a struct between them But I keep getting this error udp-server.c:67:1: error: redefinition of autostart_processes In file included...

16 January 2021 5,013 4 View

Do you know any CEFR-annotated learner corpora for writing tasks?

Dear researchers, I have been working on a machine learning algorithm to classify language learners' writing tasks automatically according to the CEFR levels. The aim is to use...

03 January 2021 7,041 2 View

Who are the leading Indigenous academics who have researched and published on STEM teaching and learning?

I'm interested to read what leading Indigenous academics have to say about the intersection between traditional or Indigenous knowledges/epistemologies, values/axiologies and ways of...

14 December 2020 10,026 10 View

How to performe a non-inferiority test in an adjusted linear regression?

I am looking for the relation between weight evolution (continuous) and a binary factor adjusted for confounders. The regression gives an (adjusted) difference and its CI less than the planned a...

13 December 2020 8,061 3 View

Timeout error!! Processor in the loop (PIL) using STM32F4 Matlab 2018a?

Dear Researchers I am trying to perform a PIL simulation using STM32F4 Discovery board and comunication serial USB TO TTL. During simulation I receive the following timeout error: An error...

01 March 2021 2,327 1 View

Which one is easier and better at modeling slender masonry structures? ANSYS or ABAQUS?

I need to model masonry and reinforced concrete minarets for my MSc thesis. Which one is easier and better at modeling slender masonry structures? ANSYS or ABAQUS? (Or any other program for just...

01 March 2021 736 3 View

What is the state of the drug inside solid lipid nanoparticles (SLNs)?

I am a little confuse with the mechanism of solid lipid nanoparticles (SLNs). The main point of encapsulating drugs into SLNs is because some drugs have low solubility in water. Therefore, SLNs...

01 March 2021 3,703 3 View

How to eliminate Steady state error from Reinforcement learning genetic algorithm code?

The following code (see 1st 2 images attached) is used to produce PID controller values that are designed to control the system (G). The code finds the PID controller values (noted as k) by using...

28 February 2021 6,560 14 View

How to Eliminate cosine error and abbe error in LASER measurement system(for example Rhenishaw XL80)?

I like to do project in laser measurement system. My objective is to eliminate or reduce the cosine error, abbe error in Laser measurement system. I have Rhenishaw XL80 system. Please tell the...

28 February 2021 4,890 3 View

How to prevent ANFIS Model from negative prediction values in MATLAB?

I have input and output data set for "ANFIS modeling in MATLAB", and I am getting some negative predicted values of output in testing. However, the predicted values of output in training are...

28 February 2021 3,459 3 View

What are the application of Fixed points thoery in Chemistry.?

It is said that fixed point theory has lot of applications not in the field of mathematics only but also in various areas. So I am looking for applications in Chemistry only..

26 February 2021 3,533 1 View

How does an AC-DC power supply Flyback Converter Based USB Charger Model using Matlab/Simulink looks like?

I am required to learn about Flyback converters and I got stuck not knowing to full design of the power supply flyback converter Based USB Charger Model using Simulink, especially the design model...

25 February 2021 5,435 2 View

How to measure angle between laser travel path and machine axis in Laser Measurement system?

25 February 2021 1,987 3 View

Please. Could you help be in implementing Fractal Discrete Cosine Transform algorithm in Matlab?

I do need the Matlab code of Fractal Discrete Cosine Transform (FDCT). Can anyone who has already implement this code, help me with the implementation of this transform?

24 February 2021 5,602 2 View