(12) United States Patent (10) Patent No.: US 8,229,231 B2 Cho et a1. (45) Date of Patent: Jul. 24, 2012
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1 US B2 (12) United States Patent (10) Patent No.: US 8,229,231 B2 Cho et a1. (45) Date of Patent: Jul. 24, 2012 (54) METHOD AND APPARATUS FOR ENCODING (56) References Cited AND DECODING IMAGE U.S. PATENT DOCUMENTS (75) Inventors: Dae-Sung Cho, Seoul (KR); Woo-Shik Kim, Yongin-si (KR); Dmitri Birinov, Yongin-si (KR); Hyun-Mun Kim, Seongnam-si (KR) (73) Assignee: Samsung Electronics Co., Ltd., SuWon-Si (KR) ( * ) Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 1227 days. (21) Appl.No.: 12/014,593 (22) Filed: Jan. 15, 2008 (65) Prior Publication Data US 2008/ A1 Jul. 24, 2008 Related US. Application Data (63) Continuation of application No. PCT/KR2006/002786,?led on Jul. 14, (30) Foreign Application Priority Data Jul. 15, 2005 (KR) (51) Int. Cl. G06K 9/36 ( ) (52) US. Cl /232; 382/233 (58) Field of Classi?cation Search /162, 382/166, 232, 233, 236, 238, ; 375/ See application?le for complete search history. 6,970,604 B1* 11/2005 Chai / / A1* 6/2005 Kimet a /24021 FOREIGN PATENT DOCUMENTS KR /2005 OTHER PUBLICATIONS Lee, J. et al., Fast mode decision for H.264, 2004 IEEE International Conf. on Multimedia and Expo, vol. 2, pp Jun. 30, Pan, F. et al., A Directional Field Based Fast Intra Mode Decision Algorithm forh.264 J/ideo Coding, 2004 IEEE International Conf. on Multimedia and Expo, vol. 2, pp , Jun. 30, Wiegand, T. Draft I TU-T Recommendation and Final Draft Interna tional Standard of Joint J/ideo Speci?cation (ITU-T Rec. H.264 ISO/IEC AVC), Doc. JVT-G050, Mar. 2003, pp. i-xiv, International Search Report dated Oct. 30, 2006 in corresponding PCT Application PCT/KR2006/ (11 pp.). International Search Report dated Oct. 30, 2006 in corresponding International Application No. PCT/KR2006/ (3 pages). Written Opinion of the International Searching Authority dated Oct. 30, 2006 in corresponding International Application No. PCT/ KR2006/ (5 pages). * cited by examiner Primary Examiner * Duy M Dang (74) Attorney, Agent, or Firm * Staas & Halsey LLP (57) ABSTRACT An apparatus and method for encoding and decoding an image are provided. The image decoding method includes (a) decoding luma blocks according to a predetermined decoding mode of each of the luma blocks, and (b) decoding chroma blocks according to the predetermined decoding mode of each of the luma blocks. 26 Claims, 20 Drawing Sheets ENCODING UNIT DECODING UNIT f OUT1
2 US. Patent Jul. 24, 2012 Sheet US 8,229,231 B2 FIG. 1 I I INI ENCODING UNIT DECODING UNIT OUTI
3 US. Patent Jul. 24, 2012 Sheet 2 or 20 US 8,229,231 B2 2%, P391 m mam, OWEN QZEOOZm :23 wmms.05 m 0mm, 7 0V, ma # Na
4 US. Patent Jul. 24, 2012 Sheet 3 or 20 US 8,229,231 B2 gollmvllko BOA-Ale q wmm mmm
5 US. Patent Jul. 24, 2012 Sheet 4 or 20 US 8,229,231 B2 16 FIG. 4A Y Cb Cr FIG. 4B Y Cb Cr FIG. 4C
6 US. Patent Jul. 24, 2012 Sheet 5 or 20 US 8,229,231 B2 P30l m m5,, GET; , 9200mm OzEOozm._._z3 N; M wz_
7 US. Patent Jul. 24, 2012 Sheet US 8,229,231 B2 FIG Y (A) Cb Or M88 LSB
8 US. Patent Jul. 24, 2012 Sheet 7 or 20 US 8,229,231 B2 FIG Y Cb / Cr 1 (A) S M88 8 L88
9 US. Patent Jul. 24, 2012 Sheet US 8,229,231 B2 FIG L Y s Cb & 1 Cr S (A) S 1 1 S S MSB 840 L88 (B)
10 US. Patent Jul. 24, 2012 Sheet 9 or 20 US 8,229,231 B I I I IN 5 THIRD FIRST SECOND OUT 6 DECODING UNIT DECODING UNIT DECODING UNIT FIG. 10 I012 I014 I Y I (A) (B) Intra Inter Cb Inter Inter Inter I I I032 I034 I Y I Intra Intra Cb Intra Inter Intra Inter I022 Intra I036 I038 I040 I042
11 US. Patent Jul. 24, 2012 Sheet 10 or 20 US 8,229,231 B2 FIG. 11 I START I ENCODE LUMA BLOCKS ACCORDING TO PREDETERMINED ENCODING MODES 1120 DETERMINE WHETHER MORE THAN HALF OF PREDETERMINED ENCODING MODES OF LUMA BLOCKS ARE INTER MODES ENCODE CHROMA BLOCKS ACCORDING TO INTER MODES ENCODE CHROMA BLOCKS ACCORDING TO INTRA MODES END
12 US. Patent Jul. 24, 2012 Sheet US 8,229,231 B2 FIG. 12 I I210 DECODE MOTION INFORMATION MOTION INFORMATION INCLUDED? ANALYZE MOTION INFORMATION NO IS IT INTRA MODE? DECODE LUMA BLOCKS ACCORDING TO INTRA MODE I228 DECODE CHROMA BLOCKS ACCORDING TO INTER MODE I216 DECODE LUMA BLOCKS ACCORDING TO INTER MODE 1226 DECODE CHROMA BLOCKS ACCORDING TO INTRA MODE ARE ALL BLOCKS OF MACROBLOCK DECODED? 1230 I232 NO
13 US. Patent Jul. 24, 2012 Sheet US 8,229,231 B I Y I (A) Intra Inter Cb Cr Inter Inter Inter Inter I Y I (B) Intra Intra Cb Cr Intra Inter Intra Intra 1346 I348 I350 I360
14 US. Patent Jul. 24, 2012 Sheet 13 0f20 US 8,229,231 B2 FIG Cb / Cr / Intra Inter Inter Inter (A) Inter Inter Inter Inter Cb / Cr / Intra Intra Intra Intra (BI Intra Inter Intra Intra
15 US. Patent Jul. 24, 2012 Sheet 14 0f 20 US 8,229,231 B I Cb 1 I 1 (A) Intra Inter Inter Inter Inter Inter Inter Inter Inter Inter Inter Inter I Cb (B) Intra Intra Intra Intra Intra Intra Intre Inter Intra Intra Intra Intra
16 US. Patent Jul. 24, 2012 Sheet 15 or 20 US 8,229,231 B2 FIG. 16 I START I II ENCODE LUIVIA BLOCKS ACCORDING TO RREDETERIVIINED ENCODING MODE OF EACH LUIVIA BLOCK M1610 II ENCODE CHROIVIA BLOCKS ACCORDING TO PREDETERIVIINED ENCODING MODE OF EACH CI-IROIVIA BLOCK ~ --I62O
17 US. Patent Jul. 24, 2012 Sheet 16 0f 20 US 8,229,231 B2 FIG. 17 ( START ) 1710 DECODE MOTION INFORMATION IS MOTION INFORMATION INCLUDED? YES 1714 ANALYZE MOTION IN FORMATION NO IS IT INTRA MODE? I716 I720 I718 DECODE BLOCKS TO BE DECODED ACCORDING TO INTER MODE DECODE BLOCKS TO BE DECODED ACCORDING TO INTRA MODE ARE ALL BLOCKS OF MACROBLOCK DECODED? I 724
18 US. Patent Jul. 24, 2012 Sheet US 8,229,231 B I Y I (A) Intra Inter Cb Cr Inter Inter Inter Intra I I I I I Y I Cb / Cr / Intra Intra Inter Intra (B) Intra Inter Intra Inter I I I I I Y I I Cb I I Cr I (C) Intra Intra Inter Intra Inter Inter Intra Inter Intre Inter Inter Inter
19 US. Patent Jul. 24, 2012 Sheet 1s or 20 US 8,229,231 B2 FIG. 19 I START I I ENCODE EACH LUMA BLOCK ACCORDING TO PBEDETEBMINED ENCODING I ENCODE EACH CHBOMA BLOCK ACCORDING TO ENCODING MODE OE EACH LUMA BLOCK $1920 HAVING SAME PHASE AS EACH CHBOMA BLOCK END
20 US. Patent Jul. 24, 2012 Sheet US 8,229,231 B2 IS MOTION INFORMATION INCLUDED? ARE LUMA BLOCKS HAVING SAME PHASE AS BLOCKS TO BE DECODED INTER MODES N 0 IS IT INTRA MODE? DECODE LUMA BLOCKS ACCORDING TO INTRA MODE 2028 DECODE CHROMA BLOCKS ACCORDING TO INTRA MODE DECODE LUMA [ECODE CHROMA BLOCK : BLOCKS ACCORDING ACCORDING TO INTER MOE E TO INTER MODE I 2 ARE ALL BLOCKS OF NO MACROBLOCK DECODED?
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