CGT511.HDR

CGT511.HDR - High Dynamic Range Karthik Sukumar MichelAbdul...

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53 High Dynamic Range Karthik Sukumar Michel Abdul CGT 511 Purdue University 1
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53 Introduction Brief History Applications Imaging Rendering Methods/Techniques Image Acquisition Imaging Rendering Limitations Summary 2 Overview
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53 Introduction High Dynamic Range Opportunity for greater dynamic range of exposures using digital imaging techniques The NVIDIA statement HDR example 3 Introduction History Applications Methods Limitations Summary
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53 LDR fails to capture the information necessary to simulate correct color balance, shadows and highlights [2] Bottom line: Lighting calculations are done with high dynamic range values so when they are mapped to low dynamic range, results in more appealing images by preserving more details. 4 Introduction Introduction History Applications Methods Limitations Summary
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53 5 Retr HDR Examples Introduction History Applications Methods Limitations Summary http://www.smashingmagazine.com/2008/03/10/35 fantastic hdr pictures/
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53 6 HDR Examples Introduction History Applications Methods Limitations Summary http://www.smashingmagazine.com/2008/03/10/35 fantastic hdr pictures/
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53 7 HDR Examples Introduction History Applications Methods Limitations Summary http://www.smashingmagazine.com/2008/03/10/35 fantastic hdr pictures/
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53 Why use HDR? Normal cameras can capture either highlights or shadows Wide dynamic range allows to more accurately represent the range of intensity levels found in real scenes Doesn’t sacrifice either of the extreme tonalities 8 Introduction Introduction History Applications Methods Limitations Summary
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53 9 Example http://www.pictional.com/TrueHDR/Overview.html Introduction History Applications Methods Limitations Summary
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53 Gustave Le Gray, 1850 pioneered using several exposures for extreme luminance range 10 Brief History Introduction History Applications Methods Limitations Summary http://en.wikipedia.org/wiki/File:Train_station_with_train_and_coal_depot_by_Gustave_Le_Gray1.jpg
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53 First time ever HDR Imaging was developed in 1940’s by Charles Wyckoff 11 Brief History Introduction History Applications Methods Limitations Summary http://en.wikipedia.org/wiki/File:Ivy_Mike_ _fireball.jpg
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53 Gregory Ward, 1985 Created the Radiance file format, which is still the most commonly used HDR image format. Nakamae et al., presented a lighting model for driving simulators that highlighted the need for high dynamic range processing in realistic simulations [4] Debevec mapped radiance maps into a scene, which is then used to light synthetic objects [2] 12 Brief History Introduction History Applications Methods Limitations Summary
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53 Imaging Photography Live action Video Spheron HD Video Camera Animation Car Video 1 13 Applications of HDR ‐ Imaging Introduction History Applications Methods Limitations Summary
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53 Fiat Lux–The movie
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CGT511.HDR - High Dynamic Range Karthik Sukumar MichelAbdul...

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