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Image analysis framework for hydraulic mixing

Aleksandra Golczak Waldemar Szaferski Szymon Woziwodzki Piotr T. Mitkowski
Chemical and Process Engineering | 2022 | vol. 43 | No 1 | 3-21 | DOI: 10.24425/cpe.2021.138941
Keywords hydraulic mixing image processing analysis of mixing time RGB colour model
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Abstract

This study is focused on the image analysis of motionless hydraulic mixing process, for which pressure changes were the driving force. To improve the understanding of hydraulic mixing, mixing efficiency was assessed with dye introduction, which resulted in certain challenges. In order to overcome them, the framework and methodology consisting of three main steps were proposed and applied to an experimental case study. The experiments were recorded using a camera and then processed according to the proposed framework and methodology. The main outputs from the methodology which were based only on the recorded movie were liquid heights and colour changes during the process time. In addition, considerable attention has also been given to issues related to other colour systems and the hydrodynamic description of the process.
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Authors and Affiliations

Aleksandra Golczak
1
Waldemar Szaferski
1
ORCID: ORCID
Szymon Woziwodzki
1
Piotr T. Mitkowski
1
ORCID: ORCID
  1. Poznan University of Technology, Department of Chemical Engineering and Equipment, Berdychowo 4, 60-965 Poznan, Poland

Development of an automated system for electrochemical production of coagulant based on photocolorimetric analysis

Andrii Safonyk Ivanna Hrytsiuk Marko Klepach Maksym Mishchanchuk Andriy Khrystyuk
Journal of Water and Land Development | 2022 | No 52 | 75-80 | DOI: 10.24425/jwld.2021.139946
Keywords coagulant colour of water electrocoagulation process photocolorimetric method RGB total iron wastewater treatment
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Abstract

The article describes the development of a model problem for electrocoagulation treatment of industrial wastewater taking into account changes in voltage and current. The study included computer simulation of the change in the concentration of iron at the output of the electrocoagulator at variable current levels. The laboratory-scale plant was developed for the photocolorimetric analysis of the iron-containing coagulant. It consisted of a flowing opaque cell through which water is pumped with a constant flow and also the block for processing and storage of information. Such structure allows to reduce human participation in the measurement process and to ensure the continuity of measurement without any need for sampling of the tested material, as well as to reduce the measurement cost. During the processing of results, graphical dependences were determined between RGB-components of water colour and the corresponding concentration of total iron and Fe3+ in water.
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Bibliography

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Authors and Affiliations

Andrii Safonyk
1
ORCID: ORCID
Ivanna Hrytsiuk
1
ORCID: ORCID
Marko Klepach
1
ORCID: ORCID
Maksym Mishchanchuk
1
ORCID: ORCID
Andriy Khrystyuk
1
ORCID: ORCID
  1. National University of Water and Environmental Engineering, Institute of Automatics, Cybernetics and Computer Engineering, Soborna St, 11, Rivne, Rivnens’ka oblast, 33028, Ukraine

The measurements of surface defect area with an RGB-D camera for a BIM-backed bridge inspection

Bartosz Wójcik Mateusz Żarski
Bulletin of the Polish Academy of Sciences Technical Sciences | 2021 | 69 | 3 | e137123 | DOI: 10.24425/bpasts.2021.137123
Keywords 3D reconstruction RGB-D camera depth sensing bridge inspection as-is BIM
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Abstract

Bridge inspections are a vital part of bridge maintenance and the main information source for Bridge Management Systems is used in decision-making regarding repairs. Without a doubt, both can benefit from the implementation of the Building Information Modelling philosophy. To fully harness the BIM potential in this area, we have to develop tools that will provide inspection accurate information easily and fast. In this paper, we present an example of how such a tool can utilise tablets coupled with the latest generation RGB-D cameras for data acquisition; how these data can be processed to extract the defect surface area and create a 3D representation, and finally embed this information into the BIM model. Additionally, the study of depth sensor accuracy is presented along with surface area accuracy tests and an exemplary inspection of a bridge pillar column.
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Authors and Affiliations

Bartosz Wójcik
1
ORCID: ORCID
Mateusz Żarski
1
ORCID: ORCID
  1. Department of Mechanics and Bridges, Faculty of Civil Engendering, Silesian University of Technology, ul. Akademicka 5, 44-100 Gliwice, Poland

Time performance of RGB to HSI colour space transformation methods

Andrzej Ziemba Elżbieta Fornalik-Wajs
Archives of Thermodynamics | 2018 | vol. 39 | No 1 | DOI: 10.1515/aoter-2018-0006
Keywords Digital image processing Optical measurement method RGB to HSI colour space transformation Linear transformation Time performance Relative computational time
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Abstract

Present paper is a continuation of works on evaluation of red, green, blue (RGB) to hue, saturation, intensity (HSI) colour space transformation in regard to digital image processing application in optical measurements methods. HSI colour space seems to be the most suitable domain for engineering applications due to its immunity to non-uniform lightning. Previous stages referred to the analysis of various RGB to HSI colour space transformations equivalence and programming platform configuration influence on the algorithms execution. The main purpose of this step is to understand the influence of computer processor architecture on the computing time, since analysis of images requires considerable computer resources. The technical development of computer components is very fast and selection of particular processor architecture can be an advantage for fastening the image analysis and then the measurements results. In this paper the colour space transformation algorithms, their complexity and execution time are discussed. The most common algorithms were compared with the authors own one. Computing time was considered as the main criterion taking into account a technical advancement of two computer processor architectures. It was shown that proposed algorithm was characterized by shorter execution time than in reported previously results.

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Authors and Affiliations

Andrzej Ziemba
Elżbieta Fornalik-Wajs

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