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Perception Motivated Hybrid Approach to Tone Mapping

Perception Motivated Hybrid Approach to Tone Mapping. Martin Č adík Czech Technical University in Prague, Czech Republic. Content. HDR tone mapping Hybrid Approach Perceptually plausible approach Cognitive approach Conclusion. High Dynamic Range Imaging. HDRI

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Perception Motivated Hybrid Approach to Tone Mapping

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  1. Perception Motivated Hybrid Approach to Tone Mapping Martin Čadík Czech Technical University in Prague, Czech Republic

  2. Content • HDR tone mapping • Hybrid Approach • Perceptually plausible approach • Cognitive approach • Conclusion

  3. High Dynamic Range Imaging • HDRI • useful in many areas of computer graphics and applications • HDR images • several orders of magnitude • high precision • [Reinhard et al. 05]

  4. Tone Mapping Issue 10-6 108 High Dynamic Range Real world 10-6 108 Ordinarypicture Low Dynamic Range

  5. Tone Mapping Goals Aesthetical Cognitive Perceptual [Cadik et al. 06]

  6. Global and Local Methods • Global methods (TRC) • fast • simple, easy to implement • good reproduction of overall image attributes(perceptual) • Local methods (TMO) • spatial processing • time-consuming • good in reproduction of details (cognitive) • artifacts

  7. Global and Local Methods [Ward94] [LCIS99]

  8. Subjective Perceptual Experiments • [Cadik et al. 06] • superiority of globalmethods for reproduction of natural scenes

  9. Hybrid Approach to Tone Mapping

  10. Hybrid Approach to Tone Mapping

  11. Hybrid Approach to Tone Mapping

  12. Hybrid Approach to Tone Mapping

  13. Hybrid Approach to Tone Mapping

  14. Enhancement Map • map we use to guide local enhancement • construction according to the aim of the method • floating point values (blend of TRC and TMO) LDR HDR

  15. Enhancement Map Benefits • Reproduction of overall attributes • not affected by local method • Lost details recovered • Fast computation • local method applied to small portion of image

  16. Perceptually Plausible Implementation [Ward 94] Bilateral filtering [Durand & Dorsey 02]

  17. Transformations Global method • Hybrid method • Local method

  18. Our Results

  19. Our Results

  20. Cognitive Approach • [Ward et al. 97] +Trilateral filter [Choudhury & Tumblin 03] • different construction of enhancement map • details in the paper

  21. Performance Results • slight slowdown of original global approaches(we ‘pay’ a bit for the wanted details) • speedup to the original local approaches(average results over 10 HDR images)

  22. Conclusions • General hybrid approach • utilization of existing methods • can be tailored to miscellaneous goals • Global method (TRC) + local method (TMO) • general paradigm of perceptually plausible TMO design • Enhancement map • Fast, simple, scalable, perceptually plausible • suitable also for time-critical HDR applications

  23. Thank You for Your Attention Perception Motivated Hybrid Approach to Tone Mapping Martin Čadík cadikm@fel.cvut.cz http://www.cgg.cvut.cz/~cadikm

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