CU的递归扫描顺序[HEVC/H.265]
在HEVC中,每个CU是可以进行递归式切分的,每次切分为正方形的4个subCU,对于LCU=64x64,最小CU=8x8的情况来说,其最小partition为4x4,其Z形扫描顺序如下图所示:
为了简化计算,在HM参考软件中有两个数组对Z型扫描顺序和光栅扫描顺序之间做了映射,即:
RasterToZscan |
|||||||||||||||
0 |
1 |
4 |
5 |
16 |
17 |
20 |
21 |
64 |
65 |
68 |
69 |
80 |
81 |
84 |
85 |
2 |
3 |
6 |
7 |
18 |
19 |
22 |
23 |
66 |
67 |
70 |
71 |
82 |
83 |
86 |
87 |
8 |
9 |
12 |
13 |
24 |
25 |
28 |
29 |
72 |
73 |
76 |
77 |
88 |
89 |
92 |
93 |
10 |
11 |
14 |
15 |
26 |
27 |
30 |
31 |
74 |
75 |
78 |
79 |
90 |
91 |
94 |
95 |
32 |
33 |
36 |
37 |
48 |
49 |
52 |
53 |
96 |
97 |
100 |
101 |
112 |
113 |
116 |
117 |
34 |
35 |
38 |
39 |
50 |
51 |
54 |
55 |
98 |
99 |
102 |
103 |
114 |
115 |
118 |
119 |
40 |
41 |
44 |
45 |
56 |
57 |
60 |
61 |
104 |
105 |
108 |
109 |
120 |
121 |
124 |
125 |
42 |
43 |
46 |
47 |
58 |
59 |
62 |
63 |
106 |
107 |
110 |
111 |
122 |
123 |
126 |
127 |
128 |
129 |
132 |
133 |
144 |
145 |
148 |
149 |
192 |
193 |
196 |
197 |
208 |
209 |
212 |
213 |
130 |
131 |
134 |
135 |
146 |
147 |
150 |
151 |
194 |
195 |
198 |
199 |
210 |
211 |
214 |
215 |
136 |
137 |
140 |
141 |
152 |
153 |
156 |
157 |
200 |
201 |
204 |
205 |
216 |
217 |
220 |
221 |
138 |
139 |
142 |
143 |
154 |
155 |
158 |
159 |
202 |
203 |
206 |
207 |
218 |
219 |
222 |
223 |
160 |
161 |
164 |
165 |
176 |
177 |
180 |
181 |
224 |
225 |
228 |
229 |
240 |
241 |
244 |
245 |
162 |
163 |
166 |
167 |
178 |
179 |
182 |
183 |
226 |
227 |
230 |
231 |
242 |
243 |
246 |
247 |
168 |
169 |
172 |
173 |
184 |
185 |
188 |
189 |
232 |
233 |
236 |
237 |
248 |
249 |
252 |
253 |
170 |
171 |
174 |
175 |
186 |
187 |
190 |
191 |
234 |
235 |
238 |
239 |
250 |
251 |
254 |
255 |
ZscanToRaster |
|||||||||||||||
0 |
1 |
16 |
17 |
2 |
3 |
18 |
19 |
32 |
33 |
48 |
49 |
34 |
35 |
50 |
51 |
4 |
5 |
20 |
21 |
6 |
7 |
22 |
23 |
36 |
37 |
52 |
53 |
38 |
39 |
54 |
55 |
64 |
65 |
80 |
81 |
66 |
67 |
82 |
83 |
96 |
97 |
112 |
113 |
98 |
99 |
114 |
115 |
68 |
69 |
84 |
85 |
70 |
71 |
86 |
87 |
100 |
101 |
116 |
117 |
102 |
103 |
118 |
119 |
8 |
9 |
24 |
25 |
10 |
11 |
26 |
27 |
40 |
41 |
56 |
57 |
42 |
43 |
58 |
59 |
12 |
13 |
28 |
29 |
14 |
15 |
30 |
31 |
44 |
45 |
60 |
61 |
46 |
47 |
62 |
63 |
72 |
73 |
88 |
89 |
74 |
75 |
90 |
91 |
104 |
105 |
120 |
121 |
106 |
107 |
122 |
123 |
76 |
77 |
92 |
93 |
78 |
79 |
94 |
95 |
108 |
109 |
124 |
125 |
110 |
111 |
126 |
127 |
128 |
129 |
144 |
145 |
130 |
131 |
146 |
147 |
160 |
161 |
176 |
177 |
162 |
163 |
178 |
179 |
132 |
133 |
148 |
149 |
134 |
135 |
150 |
151 |
164 |
165 |
180 |
181 |
166 |
167 |
182 |
183 |
192 |
193 |
208 |
209 |
194 |
195 |
210 |
211 |
224 |
225 |
240 |
241 |
226 |
227 |
242 |
243 |
196 |
197 |
212 |
213 |
198 |
199 |
214 |
215 |
228 |
229 |
244 |
245 |
230 |
231 |
246 |
247 |
136 |
137 |
152 |
153 |
138 |
139 |
154 |
155 |
168 |
169 |
184 |
185 |
170 |
171 |
186 |
187 |
140 |
141 |
156 |
157 |
142 |
143 |
158 |
159 |
172 |
173 |
188 |
189 |
174 |
175 |
190 |
191 |
200 |
201 |
216 |
217 |
202 |
203 |
218 |
219 |
232 |
233 |
248 |
249 |
234 |
235 |
250 |
251 |
204 |
205 |
220 |
221 |
206 |
207 |
222 |
223 |
236 |
237 |
252 |
253 |
238 |
239 |
254 |
255 |