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7/22/2019 n d liu Cc phng php trn nh
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mailto:[email protected]:[email protected]7/22/2019 n d liu Cc phng php trn nh
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cimtn hiunh Cc khng gian mu
Cc php tncng trn nh Cc phngphp ADL trn nh
Cc o
Hngpht trin
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1 bit
nhnhphn
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1 bit
nhnhphn
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1 bit 8 bits
nhnhphn nhxm
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1 bit 8 bits
nhnhphn nhxm nhmu
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1 bit 8 bits 24 bits
nhnhphn nhxm nhmu
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RGB
Red-Green-Blue
Hinth
CMYK
Cyan-Magenta-Yellow(Black)
In n
HSV
Hue- Saturation-Value
Datrn nntngtrcgic
Xl nh
YIQ
Luma- inphase-quadrature
Truynhnh, xl nh
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Dng trong cc hthngintmy tnh
R, G, B: [0, 255]
sRGB, Adobe RGB v Adobe Wide Gamut RGB
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L khng gian mu in 4 mu
Dng trong cc hthngin n
Spot color, CMYKOG, CcMmYK
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B
G
R
Y
M
C
1
1
1
Y
M
C
B
G
R
1
1
1
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ValueSaturation
Hue
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Thhinmiquan hcacc mu chnh xc hn
H: 003600;
S, V: 01
HSL, HSB
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Y = 0.5
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nhdngnhqut:
JPEG/JFIF, Exif,TIFF, RAW, PNG,
GIF, BMP, PPM,PGM, PBM, PNM
nhvector: CGM,SVG, vvv
nh3D: PNS, JPS,MPO
Kiunn
Nn khng mtmt:ABO, GIF, JBIG, ,
PGF, PNG, TIFF
Nn mtmt: DjVu,HAM, ICER, JPEG,
JBIG2, PGF,Wavelet compression
Kch
thc
nhnhphn
nhxm
nhmu
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nhdngnhqut:
JPEG/JFIF, Exif,TIFF, RAW, PNG,
GIF, BMP, PPM,PGM, PBM, PNM
nhvector: CGM,SVG, vvv
nh3D: PNS, JPS,MPO
Kiunn
Nn khng mtmt:ABO, GIF, JBIG, ,
PGF, PNG, TIFF
Nn mtmt: DjVu,HAM, ICER, JPEG,
JBIG2, PGF,Wavelet compression
Kch
thc
nhnhphn
nhxm
nhmu
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nhdngnhqut:
JPEG/JFIF, Exif,TIFF, RAW, PNG,
GIF, BMP, PPM,PGM, PBM, PNM
nhvector: CGM,SVG, vvv
nh3D: PNS, JPS,MPO
Kiunn
Nn khng mtmt:ABO, GIF, JBIG, ,
PGF, PNG, TIFF
Nn mtmt: DjVu,HAM, ICER, JPEG,
JBIG2, PGF,Wavelet compression
Kch
thc
nhnhphn
nhxm
nhmu
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nhdngnhqut:
JPEG/JFIF, Exif,TIFF, RAW, PNG,
GIF, BMP, PPM,PGM, PBM, PNM
nhvector: CGM,SVG, vvv
nh3D: PNS, JPS,MPO
Kiunn
Nn khng mtmt:ABO, GIF, JBIG, ,
PGF, PNG, TIFF
Nn mtmt: DjVu,HAM, ICER, JPEG,
JBIG2, PGF,Wavelet compression
Kch
thc
nhnhphn
nhxm
nhmu
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Phng to
Thu nh
Xoay
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Xn nh Mosaic
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BMP
JPEG
PNGGIF
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PSNR = 26.54 PSNR = 21.94 PSNR = 21.62
2
0 0
1( , ) ( , )
M N
i i
MSE I i j I i j MN
2
10
25510logPSNR
MSE
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0 0
1( , ) ( , )
255
M N
i j
MAE W i j W i j M N
MAE = 0 MAE = 0.0074 MAE = 0.214
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M ha bit t quan trngnht
Datrn skhc bitcccppixel
Datrn histogram 1
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5 3 3 3 7
5 5 3 3 3
4 4 5 5 0
1 2 2 2 2
1 2 4 4 1
5 3 3
001
5 0101
3 0011
3 0011
0
0
1
0100
0010
0011
4 2 3 3 7
5 5 3 3 3
4 4 5 5 0
1 2 2 2 2
1 2 4 4 1
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1 bitPSNR = 51.14
2 bitPSNR = 44.14
3 bitPSNR = 37.90
4 bit
PSNR = 31.77
5 bit
PSNR = 25.72
6 bit
PSNR = 19.89
7 bit
PSNR = 13.99
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Bc4Hnh thnh tn hiustego
x'= l+ (h'+ 1) / 2 = 209
y'= lh'/ 2=198
Bc3Tnh gi trkhcbit(chunv m
rng)
h=xy =5
h' = 2h + b= 11
Bc2
Tnh gi trtrung bnh l= (x+y) / 2=203
Bc1
Chia cptrn tn hiucover (x,y) = (206, 201) vib= 1
(206, 201)
b= 1
(209, 198)
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Bc4Tn hiuwatermark b= LSB(h') = 1
Bc3Tnh gi trkhcbitmrng h =x'y' =11
Bc2Tnh gi trtrung bnh l= (x'+y') / 2=203
Bc1
Chia cptrn tn hiucover (x',y') = (209, 198)
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Bc6
Truy hitn hiucoverx= + (h+ 1) / 2= 206
y= h/ 2= 201
Bc5
Tnh gi trkhcbit h= h'/ 2= 5
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5 3 3 3 7
5 5 3 3 3
4 4 5 5 01 2 2 2 2
1 2 4 4 1
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5 3 3 3 7
5 5 3 3 3
4 4 5 5 0
1 2 2 2 2
1 2 4 4 1
6 3 3 3 7
6 6 3 3 3
5 5 6 6 0
1 2 2 2 2
1 2 5 5 1
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76
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101101
1 0 11 0 1
4 3 4
6 6 4 3 4
5 5 6 6 0
1 2 2 2 2
1 2 5 5 1
6 3 3 3 7
6 6 3 3 3
5 5 6 6 0
1 2 2 2 2
1 2 5 5 1
6 3 3 3 7
6 6 3 3 3
5 5 6 6 0
1 2 2 2 2
1 2 5 5 1
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6 4 3 4 7
6 6 4 3 4
5 5 6 6 0
1 2 2 2 2
1 2 5 5 1
1 0 11 0 1
5 3 3 3 7
5 5 3 3 3
4 4 5 5 0
1 2 2 2 2
1 2 4 4 1
6 4 3 4 7
6 6 4 3 4
5 5 6 6 0
1 2 2 2 2
1 2 5 5 1
= 3
6 4 3 4 7
6 6 4 3 4
5 5 6 6 0
1 2 2 2 2
1 2 5 5 1
= 6
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Phchinhchagc
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Cng thcchuynitkhng gianRGB sang HSV, YUV.
u/khuytimcatngthutton
Mcv hnh catngthutton
Khnngchngchutncng