Haze removal

안재원

※ He, Kaiming, Jian Sun, and Xiaoou Tang. "Single image haze removal using dark channel prior." Pattern Analysis and Machine Intelligence, IEEE Transactions on 33.12 (2011): 2341-2353.

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1

• Haze

• Dark channel prior Haze removal

• Min channel prior Haze removal

• HLS color space Haze removal

• Results

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Haze

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- Intro

Haze

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))(1()()()( xtAxtxJxI

Axt

AxIxJ

)(

)()(

- Modeling

Dark channel prior Haze removal

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- Intro

(31, 78, 121)(161,171,178)

Dark channel prior Haze removal

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- Flow

Min Channel 대기광 검출Dark Channel

입력 영상

전달량 검출

출력 영상

Dark channel prior Haze removal

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- Estimate t(x)

))(1()()()( xtAxtxJxI

))(ˆ1())((min)(ˆ))((min)(Ω)(Ω

xtAyJxtyI CCxy

C

xy

※ C = RGB ChannelΩ(x) = 일정 영역

))(ˆ1()))(

(min(min)(ˆ)))(

(min(min)(Ω)(Ω

xtA

yJxt

A

yIC

C

xyCC

C

xyC

))(ˆ1()))(

(min(min)(Ω

xtA

yIC

C

xyC

0)))(

(min(min)(Ω

C

C

xyC A

yJ

)))(

(min(min1)(ˆ)(Ω

C

C

xyC A

yIxt

Axt

AxIxJ

)(

)()(

※ Dark channel prior

Min channel prior Haze removal

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입력 영상

출력 영상

프로파일링 결과

- Intro

sizeMaskpixelsAll ※ Image = 640x480 / Mask size = 17x17 일 때 루프문 88,780,800회 반복

Min channel prior Haze removal

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- Flow

Min Channel

입력 영상

전달량 검출

출력 영상

대기광 검출프로파일링 결과

HLS color space Haze removal

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- Intro

HLS color space Haze removal

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- Flow

대기광 검출Dark Channel

입력 영상

Luminance

Saturation

Hue

전달량 검출

전달량 검출

출력 영상

HLS color space Haze removal

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- Calculation

),,min(3

1 BGRBGR

S

CBGR ),,min(

)3

1,3

1(I

II

J

JJ

X

CS

X

CS

XBGR

)1( tAtCC CJI

)1( tAJtI

)1(3 tAtXX JI

X

CS

31 ※ I = 입력 영상(오염된 영상)

J = 원본 영상(오염되지 않은 영상)

BGR AAA

)1( tAtRR RJI )1( tAtGG GJI )1( tAtBB BJI

)1)(()( tAAAtBGRBGR BGRJJJIII

HLS color space Haze removal

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- Calculation

I

I

I CX

S3

1

)1(3

31

tAtX

CS

J

II

)1(31

3

31

tAtS

C

CS

J

J

II

)1)(1(

)1(1

JJ

JII

StAtC

SCS

)1)(1()1(

)1(1

JI

JII

StAtAC

SCS

JI

JII

StAC

SCS

)1(

)1(1

)1)(1(

II

IIJ

StAC

CSS

J

JJ

S

CX

1

3

)1( tACtC IJ )1(3 tAtXX JI

HLS color space Haze removal

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- Estimate t(x)

)1( tAtCC JI

)1( tACI

I

I

I CX

S3

1

IIII CXSX 3

)1(3 tAXSX III

A

SXt II

3

)1(1

0JC

Results

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Results

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Results

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Results

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감사합니다

Q & A

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