Sökning: "bildartefakter."

Hittade 5 uppsatser innehållade ordet bildartefakter..

  1. 1. Segmentation of Neuronal Cells Using Simplistic Methods : A Comparison of the Mean Shift Algorithm and Otsu’s Method

    Kandidat-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Författare :Alex Gunnarsson; Filip Karlsson; [2023]
    Nyckelord :;

    Sammanfattning : Information regarding specific neuronal characteristics, such as shape and distribution, is essential for quantifying the brain structure and modelling accurate computer simulations. To this end, it is important to perform cell segmentation; to isolate the cells in a given image from the surrounding tissue, so it can be further analysed. LÄS MER

  3. 2. Image inpainting methods for elimination of non-anatomical objects in medical images

    Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Författare :Andrea Lorenzo Polo; [2021]
    Nyckelord :Medical Imaging; Tumor Ablation; Inpainting; U-Net; Convolutional Neural Network;

    Sammanfattning : This project studies the removal of non-anatomical objects from medical images. During tumor ablation procedures, the ablation probes appear in the image, hindering the performance of segmentation, registration, and dose computation algorithms. These algorithms can also be affected by artifacts and noise generated by body implants. LÄS MER

  4. 3. Hur upplevd videokvalitet påverkas av upplösning och bitrate

    Kandidat-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Författare :Christoffer Eriksson; Jimmy Mäkinen; [2021]
    Nyckelord :Upplevd videokvalitet; bitrate; upplösning; videokomprimering; bildartefakter.;

    Sammanfattning : Streaming is currently the main method used to watch videos, and with this a significant portion of all Internet traffic is occupied by streaming. In order to efficiently store and transfer this large quantity of data, compression is necessary for the streaming services. LÄS MER

  5. 4. Black-Blood Phase Contrast Magnetic Resonance Imaging using Stimulated Echo Acquisition Mode : Pulse Sequence Development

    Master-uppsats, KTH/Skolan för kemi, bioteknologi och hälsa (CBH)

    Författare :Reenalyn Borromeo; [2020]
    Nyckelord :MRI; phase contrast; black blood; STEAM; myocardial motion; MRI; magnetisk resonanstomografi; faskontrast; blodutsläckning; STEAM; myokardiell rörelse;

    Sammanfattning : Doppler echocardiography is the conventional method for measurement of myocardial motion. However, the same clinical parameters can be measured with phase contrast magnetic resonance imaging (MRI). LÄS MER

  7. 5. Denoising of Complex MRI Data by Wiener-like Filtering in the Wavelet Domain - Application to High b-value Diffusion Weighted Imaging

    Master-uppsats, Lunds universitet/Sjukhusfysikerutbildningen

    Författare :Adnan Bibic; [2006]
    Nyckelord :MRI; Medicine and Health Sciences;

    Sammanfattning : Noise is a well-known problem in many imaging modalities. In magnitude magnetic resonance images, obtained by quadrature detection, the associated Rician distribution of noise constitutes a further complication. This type of noise is especially problematic at low signal-to-noise ratio (SNR) regions. LÄS MER