EP 1312220 A2 20030521 - METHOD FOR CARRYING OUT INTEGER APPROXIMATION OF TRANSFORM COEFFICIENTS, AND CODER AND DECODER
Title (en)
METHOD FOR CARRYING OUT INTEGER APPROXIMATION OF TRANSFORM COEFFICIENTS, AND CODER AND DECODER
Title (de)
VERFAHREN ZUR GANZZAHLIGEN APPROXIMATION VON TRANSFORMATIONSKOEFFIZIENTEN SOWIE CODER UND DECODER
Title (fr)
PROCEDE D'APPROXIMATION EN NOMBRES ENTIERS DE COEFFICIENTS DE TRANSFORMATION, ET CODEUR ET DECODEUR
Publication
Application
Priority
- DE 0102847 W 20010727
- DE 10039475 A 20000812
- DE 10065298 A 20001229
- DE 10116204 A 20010330
Abstract (en)
[origin: WO0215584A2] For obtaining cosine transform coefficients that have undergone an integer approximation, a restricted set of values is specified. The coefficients of the base vectors for the submatrices are selected, while satisfying the orthogonality condition, in such a manner that the sum of its squares results in the square of the dc component coefficient. These coefficients are used to derive the coefficients of the ac components. The inventive method has the advantage that a uniform standardization and quantization factor can be used for all coefficients for the purpose of quantization and standardization.
IPC 1-7
IPC 8 full level
G06F 17/14 (2006.01); H03M 7/30 (2006.01); H04N 7/30 (2006.01); H04N 7/32 (2006.01)
CPC (source: EP US)
H04N 19/60 (2014.11 - EP US)
Citation (search report)
See references of WO 0215584A2
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
DOCDB simple family (publication)
WO 0215584 A2 20020221; WO 0215584 A3 20020627; CN 1242621 C 20060215; CN 1466854 A 20040107; EP 1312220 A2 20030521; JP 2004506990 A 20040304; US 2004046754 A1 20040311; US 6856262 B2 20050215
DOCDB simple family (application)
DE 0102847 W 20010727; CN 01816608 A 20010727; EP 01956393 A 20010727; JP 2002520564 A 20010727; US 34483203 A 20030725