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Context-aware Exposure Auto- correction. Global exposure auto-correction over-exposed under-exposed low-contrast input automatic histogram stretching.

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Presentation on theme: "Context-aware Exposure Auto- correction. Global exposure auto-correction over-exposed under-exposed low-contrast input automatic histogram stretching."— Presentation transcript:

1 Context-aware Exposure Auto- correction

2 Global exposure auto-correction over-exposed under-exposed low-contrast input automatic histogram stretching

3 Global exposure auto-correction Detection: valid histogram range < threshold Method: stretch histogram, adjust gamma curve Test Images# Global CorrectionPercentage % #: Globally over-exposed, under-exposed & low-contrast images Test Images include party, family, vacation, landscape, street view, pets

4 Local exposure auto-correction inputLocal shadow / Highlight [ours] High dynamic range scene Auto adjustment [WLPG]

5 Local exposure auto-correction inputLocal shadow / Highlight [ours] Back-lighting object Auto adjustment [WLPG]

6 High dynamic range scene detection input confidence map of sky sky detection sky region scene region segment sky histogram scene histogram local contrast in scene region extract features classifier,,

7 Samples of high dynamic range scene True: False:

8 High dynamic range scene True HDR scene# PercentageFalse HDR Scene %126 #: True HDR scene images / Test Images Test Imagesdetected sky imagePercentage %

9 Back-lighting object detection input face detection body detection input extract features classifier Histogram, local contrast in face/body region Histogram of image The most attractive backlit object is human!

10 Samples of back-lighting object True: False:

11 Back-lighting object True backlit human# PercentageFalse backlit human %493 #: True backlit human images / Test Images Test Imagesdetected human imagePercentage %

12 Summary Global incorrect exposure v.s. local incorrect exposure The detected Human + Sky images account for almost 66.5% of the whole test images GlobalLocal 4.6% 21.31% ( hdr scene 13.87% + backlit human 7.44% )


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