Creating cinematic wide gamut HDR-video for the evaluation ...froehlichj/hdm-hdr-2014... · J....

J. Froehlich, S. Grandinetti! Slide 1 of 35!Creating Wide Gamut High Dynamic Range Video!

Creating cinematic wide gamut HDR-video for the evaluation of tone mapping operators and HDR-displays !

SPIE Electronic Imaging 2014!!

Jan Froehlich, Stefan Grandinetti, Bernd Eberhardt, Simon Walter, Andreas Schilling, Harald Brendel

Outline of the Talk!

-  Motivation!-  Methods!

-  Mirror Rig!

-  Limitations!-  Ghostings!-  Flare and Straylight!

-  Results!-  Future Work!-  Conclusion!

Motivation!

-  Brightness and dynamic range of consumer displays will probably increase over the next years:!

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Motivation!

-  Plenty of test image sets for still image manipulation!-  No comprehensive data set for HDR-Video manipulation yet

established.!

Kodak,BKodimBImageBSequenceB ‘Lena’BImageB

Motivation!

-  Existing HDR video data sets show non-staged everyday scenes without cinematic staging and lighting!

Krawczyk,BG.B,BHDRBVideoBSamplesB Ungers,BJ.,BLiUBHDRvBRepositoryB<BResourcesB

Motivation!

Image quality is not only determined by !-  Signal quality of the image acquisition system!

But also by!-  Lighting!-  Make-up!-  Staging!-  Framing!-  Acting!

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Methods!

Use a mirror rig to enhance dynamic range!

Quelle: http://www.dlp.com!

Methods!

Image processing pipeline (In-camera processing)!

Methods!

Image processing pipeline (Postproduction)!!

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HighlightBPreservingBImageB

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Limitations!

Double contours in long focal length shots!

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TheBreflecWonBatBtheBsideBofBtheBmirrorBtowardsBtheBLowBlightBpreservingBCameraB(94%)BcausesBdoubleBcontoursBinBtheBBHighlightBperservingBcamera.B(DashedBLine)B

Limitations!

Flares & Straylight!

Staging HDR challenges!

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Four categories!

1.  Sunlight Scenes!!!2.  Low Key Scenes!!!3.  Wide Gamut and Moving Lights!!!4.  High Contrast Skintones!

Presentation of the Material!

-  Note:!

-  The interactive presentation of the HDR-video test set is not included in this presentation.!

Results!

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Results!

-  High temporal contrasts present challenges for video tone mapping operators!

„Showgirl“B OffsetBbetweenBfirstBandBsecondBrowBbeforeBdelinearisaWonBtoBsRGB:B5BStopsB/B1:32B

Results!

-  Different display technologies show different weaknesses!

Example:BDeficienciesBofBvariableBbacklightBmonitorsB

Results – Evaluation of HDR Displays:!

-  Example: Deficiencies of variable backlight monitors !

-  FOTOS DOLBY KERZEN!

Results – Evaluation of HDR Displays:!

-  Example: Deficiencies of variable backlight monitors !

-  FOTOS DOLBY KERZEN!

Future Work!

-  Material appearance is improved through capturing a wider dynamic range e.g. specular highlights!

-  Reproduction of bright light sources and saturated highlights closer to human perception!!!

-  High contrast images provide new esthetics for image design!

-  HDR is a new enrichment for cinematic storytelling !!

Conclusion!

-  We created a new HDR-Video dataset.!

-  Cinematically staged scenes facilitate image quality assessment.!

-  High temporal and spatial contrasts provide a challenge for tone mapping operators and HDR-displays.!

-  Freely available for academic use. Download at the project website: http://www.hdm-stuttgart.de/~froehlichj/hdm-hdr-2014/ !

Thank you for joining our talk!!

Creating cinematic wide gamut HDR-video for the evaluation ...froehlichj/hdm-hdr-2014... · J....

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