Next Article in Journal
A Novel Parallel Auto-Encoder Framework for Multi-Scale Data in Civil Structural Health Monitoring
Previous Article in Journal
Long Length Document Classification by Local Convolutional Feature Aggregation
Open AccessArticle

A Weighted Histogram-Based Tone Mapping Algorithm for CT Images

1
Department of Computer Science, Norwegian University of Science and Technology, 2815 Gjøvik, Norway
2
Department of Physics, University of Oslo, 0316 Oslo, Norway
3
Department of Diagnostic Physics, Oslo University Hospital, 0424 Oslo, Norway
4
Department of Forensic Sciences, Oslo University Hospital, 0424 Oslo, Norway
5
Institute of Clinical Medicine, University of Oslo, 0318 Oslo, Norway
6
Department of Health Sciences in Gjøvik, Norwegian University of Science and Technology, 2803 Gjøvik, Norway
7
Department of Computer Science, Norwegian University of Science and Technology, 2815 Gjøvik, Norway
*
Author to whom correspondence should be addressed.
Algorithms 2018, 11(8), 111; https://doi.org/10.3390/a11080111
Received: 16 June 2018 / Revised: 16 July 2018 / Accepted: 20 July 2018 / Published: 25 July 2018
Computed Tomography (CT) images have a high dynamic range, which makes visualization challenging. Histogram equalization methods either use spatially invariant weights or limited kernel size due to the complexity of pairwise contribution calculation. We present a weighted histogram equalization-based tone mapping algorithm which utilizes Fast Fourier Transform for distance-dependent contribution calculation and distance-based weights. The weights follow power-law without distance-based cut-off. The resulting images have good local contrast without noticeable artefacts. The results are compared to eight popular tone mapping operators. View Full-Text
Keywords: tone mapping; histogram equalization; CT tone mapping; histogram equalization; CT
Show Figures

Figure 1

MDPI and ACS Style

Völgyes, D.; Martinsen, A.C.T.; Stray-Pedersen, A.; Waaler, D.; Pedersen, M. A Weighted Histogram-Based Tone Mapping Algorithm for CT Images. Algorithms 2018, 11, 111.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop