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Öğe Three-dimensional modeling in medical image processing by using fractal geometry(Journal of Computers, 2017-09) Çalışkan, Abidin; Çevik, UlusMedical images are visualized by computer and processed to obtain larger, more organized, and three-dimensional (3D) images. Thus, significant images are provided. The processed data facilitate diagnosis and treatment in the medical fields. The 3D surface models of related areas are formed by using volumetric data obtained by employing medical imaging methods such as Magnetic Resonance (MR) and Computer Tomography (CT). The purpose of this study is to obtain 3D images from the two-dimensional CT slices. These slices are obtained from the existing medical imaging devices and transferred to the z space and a mesh structure is provided between them. In addition, we investigated 3D imaging techniques, visualization, basic data types, conversion into main graphical components, and imaging algorithms. At the phase of obtaining 3D images; the image processing methods such as surface and volume imaging techniques, smoothing, denoising, and segmentation were used. The complexity and efficiency properties of the imaging algorithms were investigated and image enhancement algorithms were utilized.Öğe Overview of computer gaphics and algorithms(IEEE, 2015-05) Çalışkan, Abidin; Çevik, UlusComputer Graphics (CG) is the art of rendering, and visualizing images on the computer screens. In three-dimensional (3D) CG, a scene is first modeled geometrically, typically using triangles, and the computer is then used to calculate what the scene will look like from a specific view point at a particular instant. In CG, one of the major goals is to create photo-realistic images in real time. In recent years, Volume Visualization (VV) has attracted the attention of many researchers. VV techniques have been used to analyze and render 3D datasets, obtained from a variety of sources including medical scanners, and results of simulation of physical and synthetic phenomena, on the computer screen. Volume Graphics (VG) has proven itself as an independent graphics technology. A common purpose of VG is to achieve photo realistic rendering. To achieve this, reflections, shadows, refraction and perspective projections are all necessary elements since they occur naturally in the natural environment.Öğe 2B ve 3B medikal görüntülerde gürültü temizleme tekniklerinin karşılaştırmalı incelenmesi(Batman Üniversitesi, 2018) Çalışkan, Abidin; Çevik, Ulus; Acar, EmrullahÖğe An efficient noisy pixels detection model for CT images using extreme learning machines(Sveuciliste Josipa Jurja Strossmayera u Osijeku, 2018-06) Çalışkan, Abidin; Çevik, UlusIn this study, a new and rapid hidden resource decomposition method has been proposed to determine noisy pixels by adopting the extreme learning machines (ELM) method. The goal of this method is not only to determine noisy pixels, but also to protect critical structural information that can be used for disease diagnosis. In order to facilitate the diagnosis and also the treatment of patients in medicine, two-dimensional (2-D) images were calculated tomography (CT) which is obtained using medical imaging techniques. Utilizing a large number of CT images, promising results have been obtained from these experiments. The proposed method has shown a significant improvement on mean squared error and peak signal-to-noise ratio. The experimental results indicate that the proposed method is statistically efficient, and it has a good performance with a high learning speed. In the experiments, the results demonstrated that remarkable successive rates were obtained through the ELM method.Öğe 3D medical image processing by using filtering methods(Dicle University, 2016) Çalışkan, Abidin; Çevik, UlusIn this paper, data having medical file extensions were passed through various image processing stages, and boundary determination operations were performed. We aimed to obtain three-dimensional (3D) images after transferring the two-dimensional (2D) CT slices, obtained from the existing medical imaging devices, and to provide a mesh structure between them. At the phase of obtaining 3D images, image processing techniques such as surface and volume imaging techniques were used, and the complexity and effectiveness of the imaging algorithms were investigated, and image improving algorithms were used, as well. The noise filtering techniques for the images have been reviewed and 3D surface model has been obtained using volume rendering techniques.
