Proceedings ArticleDOI
Bilateral Histogram Equalization for X-Ray Image Tone Mapping
Tahani Madmad,Christophe De Vleeschouwer +1 more
- pp 3507-3511
TLDR
A novel tone mapping operator that fusions the multiple versions of a single HDR input obtained by clipping and normalizing its intensity based on a complete set of disjoint intervals is introduced, designed to offer a good rendering of the local structures.Abstract:
This paper introduces a novel tone mapping operator, designed to offer a good rendering of the local structures. The new operator fusions the multiple versions of a single HDR input obtained by clipping and normalizing its intensity based on a complete set of disjoint intervals. Defining the weight map associated to each version to be its clipping interval indicator function promotes contrast enhancement, but induces artifacts when neighboring pixels belong to distinct intervals. We thus propose to smooth out the indicators across neighboring pixels with similar intensity, using a standard cross-bilateral filter. With such weight maps, the fusion operator becomes equivalent to applying histogram equalization on the image regions on which the cross-bilateral filter diffuses the indicators, and is therefore referred to as Bilateral Histogram Equalization (BHE) operator. It compares favorably to previous tone mapping algorithms.read more
Citations
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A comparative study of medical image enhancement algorithms and quality assessment metrics on COVID-19 CT images
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γ Radiation Image Enhancement Method Based on Non-Linear Mapping
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Optimizing the range of a bilateral filter to enhance defects and threads visibility in x-ray radiographic testing
TL;DR: In this paper , a bilateral filter is used to extract and amplify the low-contrast local variations of the image, which are supposed to represent the object defects, and a critical step lies in the selection of the bilateral filter range parameter, which sets a contrast upper bound to the signals that are filtered out, to be scaled to a constant fraction of the rendering range.
References
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Proceedings ArticleDOI
Bilateral filtering for gray and color images
Carlo Tomasi,Roberto Manduchi +1 more
TL;DR: In contrast with filters that operate on the three bands of a color image separately, a bilateral filter can enforce the perceptual metric underlying the CIE-Lab color space, and smooth colors and preserve edges in a way that is tuned to human perception.
Journal ArticleDOI
Adaptive histogram equalization and its variations
Stephen M. Pizer,Stephen M. Pizer,E. Philip Amburn,E. Philip Amburn,John D. Austin,Robert Cromartie,Ari Geselowitz,Ari Geselowitz,Trey Greer,Bart M. ter Haar Romeny,John B. Zimmerman,John B. Zimmerman +11 more
TL;DR: It is concluded that clipped ahe should become a method of choice in medical imaging and probably also in other areas of digital imaging, and that clip ahe can be made adequately fast to be routinely applied in the normal display sequence.
Journal ArticleDOI
Fast bilateral filtering for the display of high-dynamic-range images
DurandFrédo,DorseyJulie +1 more
TL;DR: A new technique for the display of high-dynamic-range images, which reduces the contrast while preserving detail, is presented, based on a two-scale decomposition of the image into a base layer.
Proceedings ArticleDOI
Photographic tone reproduction for digital images
TL;DR: The work presented in this paper leverages the time-tested techniques of photographic practice to develop a new tone reproduction operator and uses and extends the techniques developed by Ansel Adams to deal with digital images.