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"
2 3
1
2
0
1
0
4
5
3
7 6
(a)
0
(b)
0
1 0
chain code
3
001003333212322111
0
1
3
1 3
1 2
1
2
first difference 3 0 1 3 0 3 0 0 0 3 3 1 1 3 0 3 0 0
3
2
shape number 0 0 0 3 3 1 1 3 0 3 0 0 3 0 1 3 0 3
3 2
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(d)
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"
"
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0
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Sg
0
0 1
3
0 3
1 2
2
2
chain code
0123
chain code
003221
first different
1111
first different
303303
shape number
1111
shape number
033033
(a)
0
(b)
0
1 1 2
0 3
1
3
1
3 0 3 2
2
2
chain code
00332211
chain code
03032211
first different
30303030
first different
33133030
shape number
03030303
shape number
03033133
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Level 1: 1x1
Level 2: 2x2
Level 3: 4x4
i
j
2i Level 4: 8x8 2i+1
2j
2j+1
Level 10: 512x512
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Gaussian Pyramid
g2
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