Perception Motivated Hybrid Approach to Tone...
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Perception Motivated Hybrid Approach to Tone Mapping
Martin ČadíkCzech Technical University in Prague, Czech Republic
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Perception Motivated Hybrid Approach to Tone Mapping, Martin Čadík, [email protected]’07, Pilsen, Czech Republic, 31. 1.2007
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Content
HDR tone mappingHybrid ApproachPerceptually plausible approachCognitive approachConclusion
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Perception Motivated Hybrid Approach to Tone Mapping, Martin Čadík, [email protected]’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, [email protected]’07, Pilsen, Czech Republic, 31. 1.2007
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Tone Mapping Issue
10-6 108
10-6 108
Real world
Ordinarypicture
Low Dynamic Range
High Dynamic Range
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Perception Motivated Hybrid Approach to Tone Mapping, Martin Čadík, [email protected]’07, Pilsen, Czech Republic, 31. 1.2007
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Tone Mapping GoalsTone Mapping Goals
Aesthetical Cognitive Perceptual[Cadik et al. 06]
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Perception Motivated Hybrid Approach to Tone Mapping, Martin Čadík, [email protected]’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, [email protected]’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, [email protected]’07, Pilsen, Czech Republic, 31. 1.2007
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Subjective Perceptual Experiments
[Cadik et al. 06]– superiority of global
methods for reproduction of natural scenes
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Perception Motivated Hybrid Approach to Tone Mapping, Martin Čadík, [email protected]’07, Pilsen, Czech Republic, 31. 1.2007
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Hybrid Approach to Tone Mapping
Global TM
EnhancementMap
HDR Image LDR Image
Locally EnhancedDetails
Local TM
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Perception Motivated Hybrid Approach to Tone Mapping, Martin Čadík, [email protected]’07, Pilsen, Czech Republic, 31. 1.2007
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Hybrid Approach to Tone Mapping
Global TM
EnhancementMap
HDR Image LDR Image
Locally EnhancedDetails
Local TM
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Perception Motivated Hybrid Approach to Tone Mapping, Martin Čadík, [email protected]’07, Pilsen, Czech Republic, 31. 1.2007
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Hybrid Approach to Tone Mapping
Global TM
EnhancementMap
HDR Image LDR Image
Locally EnhancedDetails
Local TM
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Perception Motivated Hybrid Approach to Tone Mapping, Martin Čadík, [email protected]’07, Pilsen, Czech Republic, 31. 1.2007
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Hybrid Approach to Tone Mapping
Global TM
EnhancementMap
HDR Image LDR Image
Locally EnhancedDetails
Local TM
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Perception Motivated Hybrid Approach to Tone Mapping, Martin Čadík, [email protected]’07, Pilsen, Czech Republic, 31. 1.2007
(13)
Hybrid Approach to Tone Mapping
Global TM
EnhancementMap
HDR Image LDR Image
Locally EnhancedDetails
Local TM
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Perception Motivated Hybrid Approach to Tone Mapping, Martin Čadík, [email protected]’07, Pilsen, Czech Republic, 31. 1.2007
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Enhancement Mapmap we use to guide local enhancementconstruction according to the aim of the methodfloating point values (blend of TRC and TMO)
HDR
LDR
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Perception Motivated Hybrid Approach to Tone Mapping, Martin Čadík, [email protected]’07, Pilsen, Czech Republic, 31. 1.2007
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Enhancement Map BenefitsReproduction of overall attributes– not affected by local method
Lost details recoveredFast computation– local method applied to small portion of image
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Perception Motivated Hybrid Approach to Tone Mapping, Martin Čadík, [email protected]’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, [email protected]’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, [email protected]’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, [email protected]’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, [email protected]’07, Pilsen, Czech Republic, 31. 1.2007
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Cognitive Approach
[Ward et al. 97] +Trilateral filter [Choudhury & Tumblin 03]different construction of enhancement map
details in the paper
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Perception Motivated Hybrid Approach to Tone Mapping, Martin Čadík, [email protected]’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)
41.70.132%118.51.4e-3%
SpeedupEnhancement map [%of pixels]
Speedup Enhancement map [%of pixels]
Cognitive implementationPerceptually plausible
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Perception Motivated Hybrid Approach to Tone Mapping, Martin Čadík, [email protected]’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 mapFast, simple, scalable, perceptually plausible– suitable also for time-critical HDR applications
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Perception Motivated Hybrid Approach to Tone Mapping
Martin Čadík
[email protected]://www.cgg.cvut.cz/~cadikm
Thank You for Your Attention