Search Results for author: Hugo L. Hammer

Found 10 papers, 2 papers with code

Advancing sleep detection by modelling weak label sets: A novel weakly supervised learning approach

no code implementations27 Feb 2024 Matthias Boeker, Vajira Thambawita, Michael Riegler, Pål Halvorsen, Hugo L. Hammer

A \gls{lstm} trained on the soft cross-entropy outperformed conventional sleep detection algorithms, other neural network architectures and loss functions in accuracy and model calibration.

Weakly-supervised Learning

VISEM-Tracking, a human spermatozoa tracking dataset

1 code implementation6 Dec 2022 Vajira Thambawita, Steven A. Hicks, Andrea M. Storås, Thu Nguyen, Jorunn M. Andersen, Oliwia Witczak, Trine B. Haugen, Hugo L. Hammer, Pål Halvorsen, Michael A. Riegler

A manual assessment of sperm motility requires microscopy observation, which is challenging due to the fast-moving spermatozoa in the field of view.

Artificial Intelligence in Dry Eye Disease

no code implementations2 Sep 2021 Andrea M. Storås, Inga Strümke, Michael A. Riegler, Jakob Grauslund, Hugo L. Hammer, Anis Yazidi, Pål Halvorsen, Kjell G. Gundersen, Tor P. Utheim, Catherine Jackson

Although the term `AI' is commonly used, recent success in its applications to medicine is mainly due to advancements in the sub-field of machine learning, which has been used to automatically classify images and predict medical outcomes.

SinGAN-Seg: Synthetic training data generation for medical image segmentation

4 code implementations29 Jun 2021 Vajira Thambawita, Pegah Salehi, Sajad Amouei Sheshkal, Steven A. Hicks, Hugo L. Hammer, Sravanthi Parasa, Thomas de Lange, Pål Halvorsen, Michael A. Riegler

The pipeline is evaluated using qualitative and quantitative comparisons between real and synthetic data to show that the style transfer technique used in our pipeline significantly improves the quality of the generated data and our method is better than other state-of-the-art GANs to prepare synthetic images when the size of training datasets are limited.

Image Segmentation Medical Image Segmentation +3

Dyadic aggregated autoregressive (DASAR) model for time-frequency representation of biomedical signals

no code implementations13 May 2021 Marco A. Pinto-Orellana, Habib Sherkat, Peyman Mirtaheri, Hugo L. Hammer

DASAR can provide a more accurate representation of the (highly contrasted) EEG and fNIRS frequency ranges by increasing the estimation accuracy in user-defined spectrum region of interest (SROI).

EEG

The Complex-Pole Filter Representation (COFRE) for spectral modeling of fNIRS signals

no code implementations13 May 2021 Marco A. Pinto Orellana, Peyman Mirtaheri, Hugo L. Hammer

The complex-pole frequency representation (COFRE) is introduced in this paper as a new approach for spectrum modeling in biomedical signals.

Efficient Quantile Tracking Using an Oracle

no code implementations27 Apr 2020 Hugo L. Hammer, Anis Yazidi, Michael A. Riegler, Håvard Rue

The MSE is decomposed in tracking variance and bias and novel and efficient procedures to estimate these quantities are presented.

A hemodynamic decomposition model for detecting cognitive load using functional near-infrared spectroscopy

no code implementations22 Jan 2020 Marco A. Pinto-Orellana, Diego C. Nascimento, Peyman Mirtaheri, Rune Jonassen, Anis Yazidi, Hugo L. Hammer

In the current paper, we introduce a parametric data-driven model for functional near-infrared spectroscopy that decomposes a signal into a series of independent, rescaled, time-shifted, hemodynamic basis functions.

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