537 research outputs found
Deep Learning-based Anomaly Detection on X-ray Images of Fuel Cell Electrodes
Anomaly detection in X-ray images has been an active and lasting research
area in the last decades, especially in the domain of medical X-ray images. For
this work, we created a real-world labeled anomaly dataset, consisting of
16-bit X-ray image data of fuel cell electrodes coated with a platinum catalyst
solution and perform anomaly detection on the dataset using a deep learning
approach. The dataset contains a diverse set of anomalies with 11 identified
common anomalies where the electrodes contain e.g. scratches, bubbles, smudges
etc. We experiment with 16-bit image to 8-bit image conversion methods to
utilize pre-trained Convolutional Neural Networks as feature extractors
(transfer learning) and find that we achieve the best performance by maximizing
the contrasts globally across the dataset during the 16-bit to 8-bit
conversion, through histogram equalization. We group the fuel cell electrodes
with anomalies into a single class called abnormal and the normal fuel cell
electrodes into a class called normal, thereby abstracting the anomaly
detection problem into a binary classification problem. We achieve a balanced
accuracy of 85.18\%. The anomaly detection is used by the company, Serenergy,
for optimizing the time spend on the quality control of the fuel cell
electrodesComment: 10 pages, 9 figures, VISAPP202
Using Electronic Patient Records to Discover Disease Correlations and Stratify Patient Cohorts
Electronic patient records remain a rather unexplored, but potentially rich data source for discovering correlations between diseases. We describe a general approach for gathering phenotypic descriptions of patients from medical records in a systematic and non-cohort dependent manner. By extracting phenotype information from the free-text in such records we demonstrate that we can extend the information contained in the structured record data, and use it for producing fine-grained patient stratification and disease co-occurrence statistics. The approach uses a dictionary based on the International Classification of Disease ontology and is therefore in principle language independent. As a use case we show how records from a Danish psychiatric hospital lead to the identification of disease correlations, which subsequently can be mapped to systems biology frameworks
A recursive kinematic random forest and alpha beta filter classifier for 2D radar tracks
In this work, we show that by using a recursive random forest together with an alpha beta filter classifier it is possible to classify radar tracks from the tracks’ kinematic data. The kinematic data is from a 2D scanning radar without Doppler or height information. We use random forest as this classifier implicit handles the uncertainty in the position measurements. As stationary targets can have an apparently high speed because of the measurement uncertainty, we use an alpha beta filter classifier to classify stationary targets from moving targets. We show an overall classification rate from simulated data at 82.6 % and from real world data 79.7 %. Additional to the confusion matrix we also show recordings of real world data
Bayesian interpolation in a dynamic sinusoidal model with application to packet-loss concealment
Publication in the conference proceedings of EUSIPCO, Aalborg, Denmark, 201
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