Diapositiva 1

OVERVIEW OF JPEG2000 CORE CODING SYSTEMDepartment of Information and Communications EngineeringUniversitat Autnoma de Barcelona, SpainFrancesc Aul-Llins

1

ORIGINAL IMAGEJPEG2000 CORE CODING SYSTEM2

ORIGINAL IMAGE

MULTI-COMPONENTTRANSFORMJPEG2000 CORE CODING SYSTEM3ORIGINAL IMAGE

MULTI-COMPONENTTRANSFORM

WAVELETTRANSFORMQUANTIZATIONJPEG2000 CORE CODING SYSTEM4

ORIGINAL IMAGEMULTI-COMPONENTTRANSFORMWAVELETTRANSFORMQUANTIZATIONJPEG2000 CORE CODING SYSTEM5

ORIGINAL IMAGEMULTI-COMPONENTTRANSFORMWAVELETTRANSFORMQUANTIZATIONJPEG2000 CORE CODING SYSTEM6

ORIGINAL IMAGEMULTI-COMPONENTTRANSFORMWAVELETTRANSFORMQUANTIZATIONJPEG2000 CORE CODING SYSTEM7

ORIGINAL IMAGEMULTI-COMPONENTTRANSFORMWAVELETTRANSFORMQUANTIZATIONcoding passbitplaneJPEG2000 CORE CODING SYSTEM8

ORIGINAL IMAGEMULTI-COMPONENTTRANSFORMWAVELETTRANSFORMQUANTIZATIONcoding pass

bitplane

SPPMRPCPTypes of coding passes:

SPP - Significance Propagation MRP - Magnitude Refinement CP - CleanupJPEG2000 CORE CODING SYSTEM9

ORIGINAL IMAGEMULTI-COMPONENTTRANSFORMWAVELETTRANSFORMQUANTIZATION

SPPMRPCPTypes of coding passes:

SPP - Significance Propagation MRP - Magnitude Refinement CP - CleanupJPEG2000 CORE CODING SYSTEM10

ORIGINAL IMAGEMULTI-COMPONENTTRANSFORMWAVELETTRANSFORMQUANTIZATIONTIER-1CODINGJPEG2000 CORE CODING SYSTEM11

ORIGINAL IMAGEMULTI-COMPONENTTRANSFORMWAVELETTRANSFORMQUANTIZATIONTIER-1CODINGJPEG2000 CORE CODING SYSTEM12

ORIGINAL IMAGEMULTI-COMPONENTTRANSFORMWAVELETTRANSFORMQUANTIZATIONTIER-1CODINGJPEG2000 CORE CODING SYSTEM13ORIGINAL IMAGEMULTI-COMPONENTTRANSFORMWAVELETTRANSFORMQUANTIZATIONTIER-1CODING1. TARGET BITRATE Quality maximization2. TARGET QUALITY Bitrate minimization

TIER-2CODINGJP2 CODESTREAMRD OPTIMIZATIONJPEG2000 CORE CODING SYSTEM14ORIGINAL IMAGEMULTI-COMPONENTTRANSFORMWAVELETTRANSFORMQUANTIZATIONTIER-1CODINGTIER-2CODINGJP2 CODESTREAMRD OPTIMIZATIONR1,D1R3,D3R4,D4R5,D5R2,D2RDconvex hull12345JPEG2000 CORE CODING SYSTEM1. TARGET BITRATE Quality maximization2. TARGET QUALITY Bitrate minimization

15R1,D1R3,D3R4,D4R5,D5R2,D2RDLagrange multiplier optimization:Determine the convex hull for all codeblocksCompute the slope of all codestream segments on the convex hullSelect segments with highest slope until reaching the target bitrate or qualityJPEG2000 CORE CODING SYSTEMORIGINAL IMAGEMULTI-COMPONENTTRANSFORMWAVELETTRANSFORMQUANTIZATIONTIER-1CODINGTIER-2CODINGJP2 CODESTREAMRD OPTIMIZATION1625%60%15%CODING TIMEJPEG2000 CORE CODING SYSTEMORIGINAL IMAGEMULTI-COMPONENTTRANSFORMWAVELETTRANSFORMQUANTIZATIONTIER-1CODINGTIER-2CODINGJP2 CODESTREAM17

mximaqualitatmximaqualitatmximaqualitat

JPEG2000 CORE CODING SYSTEMORIGINAL IMAGEMULTI-COMPONENTTRANSFORMWAVELETTRANSFORMQUANTIZATIONTIER-1CODINGTIER-2CODINGJP2 CODESTREAM18

resoluci 1resoluci 2resoluci 3JPEG2000 CORE CODING SYSTEMORIGINAL IMAGEMULTI-COMPONENTTRANSFORMWAVELETTRANSFORMQUANTIZATIONTIER-1CODINGTIER-2CODINGJP2 CODESTREAM19

JPEG2000JPEG2000 CORE CODING SYSTEM20

JPEG2000 CORE CODING SYSTEM21JPEG2000 CORE CODING SYSTEM

22JPEG2000 CORE CODING SYSTEM23JPEG2000 CORE CODING SYSTEM24JPEG2000 CORE CODING SYSTEMScanned coefficient9 different contexts to code significance status (depending on the neighbors)5 different contexts to code the sign (depending on the neighbors) Significance propagation pass Magnitude refinement pass Cleanup passnon significant coefficientsignificant coefficientcoefficients to scan25JPEG2000 CORE CODING SYSTEM Significance propagation pass Magnitude refinement pass Cleanup passnon significant coefficientsignificant coefficient (previous bit planes)refinement in this bit plane: 0/11010113 different contexts to code refinement26JPEG2000 CORE CODING SYSTEM Significance propagation pass Magnitude refinement pass Cleanup passnon visited coefficientsvisited coefficientssame coding contexts as the significance propagation pass+ run mode (2 special contexts)27