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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.
2019-04-10
1
• Haze
• Dark channel prior Haze removal
• Min channel prior Haze removal
• HLS color space Haze removal
• Results
2019-04-10
2
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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5
- 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
2019-04-10