Local tone mapping using the K-means algorithm and automatic gamma setting

Tone mapping (TM) algorithms reproduce the high dynamic range (HDR) images on low dynamic range (LDR) display devices such as monitors or printers. In this paper, we propose a local TM algorithm, in which the HDR input is segmented using the K-means algorithm and a display gamma parameter is set aut...

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Bibliographic Details
Published in:IEEE transactions on consumer electronics 2011-02, Vol.57 (1), p.209-217
Main Authors: Won Lee, Ji, Park, Rae-Hong, Chang, Soonkeun
Format: Article
Language:English
Subjects:
Algorithms
Clustering algorithms
Color
Computer simulation
Display devices
Dynamic range
Filtering
Filtering algorithms
gamma setting
Heuristic algorithms
high dynamic range image
Histograms
Image color analysis
Image contrast
Luminance
luminance compression
Mapping
Monitors
Studies
tone mapping
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Summary:Tone mapping (TM) algorithms reproduce the high dynamic range (HDR) images on low dynamic range (LDR) display devices such as monitors or printers. In this paper, we propose a local TM algorithm, in which the HDR input is segmented using the K-means algorithm and a display gamma parameter is set automatically for each segmented region. The proposed TM algorithm computes the luminance of an input that is the radiance map generated from a set of LDR images acquired with varying exposure settings. Then, according to the bilateral filtered luminance, an image is divided into a number of regions using the K-means algorithm. The display gamma value is set automatically according to the mean value of each region. Then, the tone of HDR image is reproduced by a local TM method with adaptive gamma value. We generate the tone-mapped image using the proposed local TM. Computer simulation with real LDR images shows the effectiveness of the proposed local TM algorithm in terms of the visual quality as well as the local contrast. It can be used for contrast and color enhancement in various display and acquisition devices.
ISSN:0098-3063
1558-4127
DOI:10.1109/TCE.2011.5735504