Papers by Keyword: Image Analysis

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Authors: Zheng Chen, Lu Feng Yang, Fei Xu, Qing Ge Feng
Abstract: The accurate analysis of the length of the interfacial transition zone (ITZ) between aggregates and the hardened bulk cement paste is of great importance to the definition of the effective diffusion field in concrete. A new method for measuring the length of ITZ on concrete section by digital image processing technique is proposed in this paper. Compared with the traditional method, the ITZ on concrete section can be discriminated and the length of ITZ can be measured by the method presented rapidly and accurately, and the method can be used in various section forms of concrete specimens.
Authors: B. Vanajakshi, L. Pratap Reddy
Abstract: Preprocessing is an operation with images at the lowest level of abstraction. Many preprocessing steps are used in the generation of images for a better quality. Skeletons are important shape descriptors in object representation and recognition. The present paper investigated how different skeletons (thinning and skeletonization) are going to be affected on various preprocessing methods. The experimental results on different images indicate good comparison of variation of skeletons on different methods of preprocessed steps.
Authors: Qazi Umar Farooq, Taro Uchimura
Abstract: Water resistant fine soil is required to be prepared for the development of an oil contamination control system, which is currently part of an ongoing research topic at the University of Tokyo. For this purpose, Fujinomori clay has been chemically treated in a laboratory to create a form of water proofing on the clay particles. The effectiveness of water repellent properties of the treated Fujinomori clay is articulated by using model tests and image analysis. The basic principle of the image analysis is the variation in soil color, with respect to moisture / fluid content.
Authors: Jacek Pietraszek, Norbert Radek, Konrad Bartkowiak
Abstract: Carbide coatings have numerous industrial applications due to their high abrasion, sliding and erosion resistance. The paper presents results of an advanced statistical analysis – involving auxiliary simulation methods like smooth bootstrapping and imputing of missing data – executed on surface layer profile of modified carbide-ceramic coatings. Source data were gathered in the previous research by Radek and Bartkowiak focused on microstructure analysis (SEM Joel JSM-5400), microhardness (Vickers method), roughness (FORM TALYSURF-120L) and adhesion (CSEM REVETEST)) tests. Anti-wear coating were first deposited on carbon steel C45 from WC-Co-Al2O3 electrodes in the process of the electro-spark alloying (ESA) by the EIL-8a apparatus. In the next step the coating were laser melted using impulse mode of Nd:YAG laser (BLS 720 model). Due to significant irregularity of collected data, the special methods of smoothing and imputing were involved based on Monte-Carlo methods. The collected data set was several times randomly divided into analytical and verification sub-sets and mentioned methods were applied. The results were used to calculate descriptive statistics like average values, variances, confidence intervals and smoothed histograms of probability distributions. The validity of the proposed approach was positively verified and it significantly improved quality of the results. The smoothing and imputing of data allow to avoid numerical artifacts that may arise during the classical statistical calculations on irregular data.
Authors: Rémi C. Zante, Craig Knowles
Abstract: Superplastic forming of titanium is typically restricted to low volume, high value products due to the high costs inherent in the current process. Problems contributing to the high costs stem from the interactions that take place at the die/part interface and include; poor part surface finish due to the build-up of corrosion products on the die surface and part distortion due to adhesion at the die surface. This paper describes novel methods for the investigation of the build-up of corrosion products on the die using surface digitization tools with laboratory based simulations of the forming conditions and a novel method for monitoring, analyzing and quantifying the die surface condition in a production environment using a combination of thermal imaging techniques and image analysis.
Authors: Arin Jumpasut, Nik Petrinic, Ben C.F. Elliott, Clive R. Siviour, Matthew R. Arthington
Abstract: This study concentrates on the use of corners targets for photogrammetry in impact engineering. An example of high speed experimentation is presented and the associated difficulties are discussed. The relevant corner detection methods that have been implemented and developed are investigated and their accuracy assessed. This study focuses solely upon the effect of blurring on the accuracy of the detection methods; it is part of a much wider investigation into the use and accuracy of different targets and target detection methods for photogrammetry in impact engineering. A set of tests has been performed and the errors between the true position of the corner and the detected position are compared.
Authors: Akihiro Takiyama, Kazuaki Nakane, Katsuyuki Kida
Abstract: From early 20th, the homology have been studied as a branch of mathematics. It has been one of a major topic in mathematics and applied in many scientific fields. The homology can be regarded as a mathematical concept of quantifying the contact degree. Because it belongs to modern mathematics, advanced knowledge of mathematics are required to understand this concept. Fortunately, since the definition of the homology is very simple in two-dimensional case, we can easily apply this to image analyzing methods. Fracture surface is composed of a process that cracks grow. If these cracks contact one another, rupture occurs. Progress of the fracture would vary due to the effect of external force. We identify the rapid and the fatigue fracture surface by a homology method. By analyzing the state of fracture via a homology method, it is believed that the cause of fracture can be estimated.
Authors: Yuan Lou Gao, Li Zhou, Xin Wang
Abstract: In many industries, such as chemical industry, food industry and cement industry, rolling drum are widely used for mixing solids. The quality of product is directly determined by the mixing uniformity, thus it is desired to be able to research the mixing rates quantitatively. This paper describes an image-based experimental method to study the mixing process. With three physical quantities, the contact length, the diameters of single material blocks and the average extent of the adjacent areas, the mixing rate and some other mixing feathers could be evaluated. And an experiment was conducted to verify this analysis method.
Authors: Yuan Lou Gao, Li Zhou, Xin Wang
Abstract: In many industries, such as chemical industry, food industry and cement industry, rolling drum are widely used for the mixing of solids which in many cases is the mixture of particles of different sizes. The quality of product is directly determined by the mixing uniformity, thus it is desired to guarantee the stability of mixing extent of rolling drum. This paper describes a new structure design for the mixture of different sizes of particles, and an image-analysis-based experimental method to verify the effectiveness of this new structure. Results of the experiment showed that using the new structure would enable a faster mixing rate, and obtaia higher mixing extent relative to the traditional structure.
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