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X l nng cao chtlngnh
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Cc kthutx l nhnhm nng cao chtlng
Sdng ton tim
Sdng ton t khng gian
Khi phcnh do nhiu
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L nhng php ton khng phthucvtrim
nh:
Tnggim sng
Thng k tnsut
Binitnsut
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Vinh I vi kch thc m x n v s nguyn c th
tnggim sng l:
I [i, j] = I [i, j] + c; (i,j)
Nu c > 0 th tng sng
Nu c < 0 th gim sng
11/01/2013 Phm Vit Hng Nhp mn x l nh 4
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Vinh I vi kch thc m x n v hai s Min, Max
v ngng th tch ngng l:
I [i, j] = I [i, j] > =?Max: Min; (I,j)
Vi Min = 0, Max = 1 th kthut ny l chuyn
nhentrng
11/01/2013 Phm Vit Hng Nhp mn x l nh 5
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Nhmgimbtmc xm bng cch nhm cc
mc xm gn nhau thnh mt nhm.
Nu c 2 nhm th l tch ngng.
11/01/2013 Phm Vit Hng Nhp mn x l nh 6
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Biutnsutmc xm g canh I l sim
nh c gi tr g canh I k hiu l h(g).
11/01/2013 Phm Vit Hng Nhp mn x l nh 7
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Da vo biutnsut c th xc nh cc cmmc xm gn nhau.
Thng thng c nhiu nhm v kch thc khc
nhau
11/01/2013 Phm Vit Hng Nhp mn x l nh 8
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khi qut th kch thc nhm bng nhau ta c
I [i, j] = I [i, j] / bunch_size * bunch_size; (i,j)
B cmvi kch thc nhm l 3
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nh I cgi l cn bng l tng l nu
h(g) = h(g); (g,g)
Vinh I kch thc m n v c smc xm cn
bng l no_level S im nh trung bnh ca mi mc xm ca nh
cn bng l
TB = (m n) / no_level S im nh c mc xm g l
11/01/2013 Phm Vit Hng Nhp mn x l nh 10
g
0i
h(i)t(g)
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Cn bngtnsut l xc nh hm f: g f(g)sao
cho
Ch : nh cn bng xong chachc l cn bngl tng
11/01/2013 Phm Vit Hng Nhp mn x l nh 11
1
TB
t(g)round0,maxf(g)
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V d cn bngnh I vino_level= 4
11/01/2013 Phm Vit Hng Nhp mn x l nh 12
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Ngng trong k thut tch ngng thng
c ci bi ngi s dng.
K thuttm tch ngng t ng nhm tm ra
ngng mt cch t ng
Da vo biutnsut
Vt th tch lm 2 phn nu tng lnh trong tng
phn ltithiu
11/01/2013 Phm Vit Hng Nhp mn x l nh 13
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nh I kch thc m n
G l smc xm canhkckhuytthiu
t(g) l s im nh c mc xm g
Mmen qun tnh trung bnh c mc xm g l
Hm f: g f(g)l
11/01/2013 Phm Vit Hng Nhp mn x l nh 14
g
0i
i.h(i)t(g)
1m(g)
21)m(Gm(g)t(g)m.n
t(g)f(g)
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Tm sao cho:
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f(g)max)f(1Gg0
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Nubitnhgc v hm bini th ta s c nh
bini v biutnsutcanhbini
Nubitbiutnsutcanhgc v hm
bini th c tnh cbiutnsutcanh
bini khng?
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V d: cn tnh h(q) vi q = f(g)
11/01/2013 Phm Vit Hng Nhp mn x l nh 17
)(
1
)()(
qfi
ihqh
