Sökning: "level-set segmentation"

Visar resultat 1 - 5 av 7 uppsatser innehållade orden level-set segmentation.

  1. 1. A Gaussian Mixture Model based Level Set Method for Volume Segmentation in Medical Images

    Master-uppsats, Linköpings universitet/Beräkningsmatematik; Linköpings universitet/Tekniska fakulteten

    Författare :Grayson Webb; [2018]
    Nyckelord :Probablistic level set methods; Gaussian mixture models; image segmentation; volume segmentation; medical images;

    Sammanfattning : This thesis proposes a probabilistic level set method to be used in segmentation of tumors with heterogeneous intensities. It models the intensities of the tumor and surrounding tissue using Gaussian mixture models. LÄS MER

  3. 2. Segmentation of high frequency 3D ultrasound images for skin disease characterization

    Master-uppsats, KTH/Teknisk informationsvetenskap

    Författare :Adrien Anxionnat; [2017]
    Nyckelord :level-set segmentation; active contours; optimization; statistical modeling; Blitz ;

    Sammanfattning : This work is rooted in a need for dermatologists to explore skin characteristicsin depth. The inuence of skin disease such as acne in dermal tissues is stilla complex task to assess. Among the possibilities, high frequency ultrasoundimaging is a paradigm shift to probe and characterizes upper and deep dermis. LÄS MER

  4. 3. Design, Evaluation and Implementation of a Pipeline for Semi-Automatic Lung Nodule Segmentation

    Master-uppsats, Linköpings universitet/Datorseende

    Författare :Lukas Berglin; [2016]
    Nyckelord :;

    Sammanfattning : Lung cancer is the most common type of cancer in the world and always manifests as lung nodules. Nodules are small tumors that consist of lung tissue. They are usually spherical in shape and their cores can be either solid or subsolid. Nodules are common in lungs, but not all of them are malignant. LÄS MER

  5. 4. Calving Events Detection and Quantification from Time-lapse Images : A Case Study of Tunabreen Glacier, Svalbard

    Master-uppsats, Uppsala universitet/Institutionen för informationsteknologi

    Författare :Sigit Adinugroho; [2015]
    Nyckelord :;

    Sammanfattning : A fully automated method for detecting and measuring calving regions of a glacier is an important tool to gather massive statistical data of calving events. A new framework to achieve the goals is presented in this thesis. First, time-lapse images are registered to the first image in the set. LÄS MER

  7. 5. Automatic Segmentation of Tissues in CT Images of the Pelvic Region

    Master-uppsats, Linköpings universitet/Institutionen för medicinsk teknik; Linköpings universitet/Tekniska högskolan

    Författare :Martin Kardell; [2014]
    Nyckelord :Image segmentation; Computed tomography; Pelvic region; Prostate; Thresholding; Region growing; Atlas segmentation; Deformable models;

    Sammanfattning : In brachytherapy, radiation therapy is performed by placing the radiation source into or very close to the tumour. When calculating the absorbed dose, water is often used as the radiation transport and dose scoring medium for soft tissues and this leads to inaccuracies. LÄS MER