Perception Motivated Hybrid Approach to Tone Mapping Martin adk - - PowerPoint PPT Presentation

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Perception Motivated Hybrid Approach to Tone Mapping Martin adk - - PowerPoint PPT Presentation

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Perception Motivated Hybrid Approach to Tone Mapping Martin adk Czech Technical University in Prague, Czech Republic Content HDR tone mapping Hybrid Approach Perceptually plausible approach Cognitive approach Conclusion

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Perception Motivated Hybrid Approach to Tone Mapping

Martin Čadík

Czech Technical University in Prague, Czech Republic

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Perception Motivated Hybrid Approach to Tone Mapping, Martin Čadík, cadikm@fel.cvut.cz WSCG’07, Pilsen, Czech Republic, 31. 1.2007

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Content

HDR tone mapping Hybrid Approach Perceptually plausible approach Cognitive approach Conclusion

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Perception Motivated Hybrid Approach to Tone Mapping, Martin Čadík, cadikm@fel.cvut.cz WSCG’07, Pilsen, Czech Republic, 31. 1.2007

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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]
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Perception Motivated Hybrid Approach to Tone Mapping, Martin Čadík, cadikm@fel.cvut.cz WSCG’07, Pilsen, Czech Republic, 31. 1.2007

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Tone Mapping Issue

10-6 108 10-6 108

Real world Ordinary picture

Low Dynamic Range High Dynamic Range

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Perception Motivated Hybrid Approach to Tone Mapping, Martin Čadík, cadikm@fel.cvut.cz WSCG’07, Pilsen, Czech Republic, 31. 1.2007

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Tone Mapping Goals Tone Mapping Goals

Aesthetical Cognitive Perceptual

[Cadik et al. 06]

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Perception Motivated Hybrid Approach to Tone Mapping, Martin Čadík, cadikm@fel.cvut.cz WSCG’07, Pilsen, Czech Republic, 31. 1.2007

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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

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Perception Motivated Hybrid Approach to Tone Mapping, Martin Čadík, cadikm@fel.cvut.cz WSCG’07, Pilsen, Czech Republic, 31. 1.2007

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Global and Local Methods

[Ward94] [LCIS99]

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Perception Motivated Hybrid Approach to Tone Mapping, Martin Čadík, cadikm@fel.cvut.cz WSCG’07, Pilsen, Czech Republic, 31. 1.2007

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Subjective Perceptual Experiments

[Cadik et al. 06]

– superiority of global methods for reproduction

  • f natural scenes
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Perception Motivated Hybrid Approach to Tone Mapping, Martin Čadík, cadikm@fel.cvut.cz WSCG’07, Pilsen, Czech Republic, 31. 1.2007

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Hybrid Approach to Tone Mapping

Global TM Enhancement Map HDR Image LDR Image

Locally Enhanced Details

Local TM

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Perception Motivated Hybrid Approach to Tone Mapping, Martin Čadík, cadikm@fel.cvut.cz WSCG’07, Pilsen, Czech Republic, 31. 1.2007

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Hybrid Approach to Tone Mapping

Global TM Enhancement Map HDR Image LDR Image

Locally Enhanced Details

Local TM

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Perception Motivated Hybrid Approach to Tone Mapping, Martin Čadík, cadikm@fel.cvut.cz WSCG’07, Pilsen, Czech Republic, 31. 1.2007

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Hybrid Approach to Tone Mapping

Global TM Enhancement Map HDR Image LDR Image

Locally Enhanced Details

Local TM

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Perception Motivated Hybrid Approach to Tone Mapping, Martin Čadík, cadikm@fel.cvut.cz WSCG’07, Pilsen, Czech Republic, 31. 1.2007

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Hybrid Approach to Tone Mapping

Global TM Enhancement Map HDR Image LDR Image

Locally Enhanced Details

Local TM

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Perception Motivated Hybrid Approach to Tone Mapping, Martin Čadík, cadikm@fel.cvut.cz WSCG’07, Pilsen, Czech Republic, 31. 1.2007

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Hybrid Approach to Tone Mapping

Global TM Enhancement Map HDR Image LDR Image

Locally Enhanced Details

Local TM

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Perception Motivated Hybrid Approach to Tone Mapping, Martin Čadík, cadikm@fel.cvut.cz WSCG’07, Pilsen, Czech Republic, 31. 1.2007

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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)

HDR LDR

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Perception Motivated Hybrid Approach to Tone Mapping, Martin Čadík, cadikm@fel.cvut.cz WSCG’07, Pilsen, Czech Republic, 31. 1.2007

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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

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Perception Motivated Hybrid Approach to Tone Mapping, Martin Čadík, cadikm@fel.cvut.cz WSCG’07, Pilsen, Czech Republic, 31. 1.2007

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

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Perception Motivated Hybrid Approach to Tone Mapping, Martin Čadík, cadikm@fel.cvut.cz WSCG’07, Pilsen, Czech Republic, 31. 1.2007

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Transformations

Global method Hybrid method Local method

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Perception Motivated Hybrid Approach to Tone Mapping, Martin Čadík, cadikm@fel.cvut.cz WSCG’07, Pilsen, Czech Republic, 31. 1.2007

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Our Results

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Perception Motivated Hybrid Approach to Tone Mapping, Martin Čadík, cadikm@fel.cvut.cz WSCG’07, Pilsen, Czech Republic, 31. 1.2007

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Our Results

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Perception Motivated Hybrid Approach to Tone Mapping, Martin Čadík, cadikm@fel.cvut.cz WSCG’07, Pilsen, Czech Republic, 31. 1.2007

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Cognitive Approach

[Ward et al. 97] +

Trilateral filter [Choudhury & Tumblin 03]

different construction

  • f enhancement map

details in the paper

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Perception Motivated Hybrid Approach to Tone Mapping, Martin Čadík, cadikm@fel.cvut.cz WSCG’07, Pilsen, Czech Republic, 31. 1.2007

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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)

41.7 0.132% 118.5 1.4e-3%

Speedup Enhancement map [%of pixels] Speedup Enhancement map [%of pixels]

Cognitive implementation Perceptually plausible

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Perception Motivated Hybrid Approach to Tone Mapping, Martin Čadík, cadikm@fel.cvut.cz WSCG’07, Pilsen, Czech Republic, 31. 1.2007

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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

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Perception Motivated Hybrid Approach to Tone Mapping

Martin Čadík

cadikm@fel.cvut.cz http://www.cgg.cvut.cz/~cadikm Thank You for Your Attention