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Optimal Global Approximation to Spatially Varying Tone Mapping Operators

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Compared with spatially-varying tone-mapping operators, global tone maps have the advantage that the input is mapped to an output image without introducing spatial artifacts common to spatially-varying tone-mapping operators (e.g. halos and intensity inversions). However some local detail can be compressed (visually lost). In this work, we propose a global tone-mapping operator that optimally, in a sum of least-squares sense, approximates spatially-varying tone-mapping operators.

Our method is based on a modification of the simple but elegant constrained optimization technique called Pool-Adjacent- Violators-Algorithm (PAVA). In a second step, we show how any lost local detail can be brought back through copying, in an edge sensitive manner, detail from the original input (an approach already developed in the literature).

Our new global tone-curve approach has a specific advantage: we show it suffices to learn the tone-curve by processing a small thumbnail and then produce the final output by applying the tone-curve to the full resolution input. Not only does processing on thumbnails deliver excellent results we can, using this approach, significantly increase the speed of tone-mapping operators.

To evaluate our method we carried out a paired comparison psychophysical experiment. Preference scores resulting from the experiment show that in general the perceived quality of our proposed operator is similar (equally preferred) to a range of spatially-varying tone-mapping operators.
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Document Type: Research Article

Publication date: January 1, 2012

More about this publication?
  • Started in 2002 and merged with the Color and Imaging Conference (CIC) in 2014, CGIV covered a wide range of topics related to colour and visual information, including color science, computational color, color in computer graphics, color reproduction, volor vision/psychophysics, color image quality, color image processing, and multispectral color science. Drawing papers from researchers, scientists, and engineers worldwide, DGIV offered attendees a unique experience to share with colleagues in industry and academic, and on national and international standards committees. Held every year in Europe, DGIV papers were more academic in their focus and had high student participation rates.

    Please note: For purposes of its Digital Library content, IS&T defines Open Access as papers that will be downloadable in their entirety for free in perpetuity. Copyright restrictions on papers vary; see individual papers for details.

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