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Decoder for decoding image data from a data stream, encoder for encoding image data into a data stream, and data stream comprising image data and data on greatest coded line index values

Título alternativo: Decodierer zur decodierung von bilddaten aus einem datenstrom, codierer zur codierung von bilddaten in einen datenstrom und datenstrom mit bilddaten und daten zu grössten codierten zeilenindexwerten
Título alternativo: Décodeur pour le décodage de données d'image à partir d'un flux de données, codeur pour coder des données d'image dans un flux de données et flux de données comprenant des données d'image et des données sur la plus grande des valeurs d'indice de lign
Tipo: Patente
Titulares:
Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V (100%)
Inventores:
Keinert, Joachim
Richter, Thomas
Thoma, Herbert
Scherl, Christian
de Frutos López, Manuel
Fößel, Siegfried
Heppner, Wolfgang
Wtjurin, Sergej
Solicitud
E17180276A
07-07-2017
Concesión
The invention concerns a decoder (2) for decoding image data (4) from a data stream (6) comprising data (8) on coefficients (50, 51, 52, 53) obtained from a frequency transform of the image data (4) and comprising Greatest Coded Line Index (GCLI) values (10), each related to a coefficient group (54, 58) within a sequence of coefficient groups (54, 58). The decoder (2) comprises a decoding unit (12) for decoding the GCLI values (10) of the sequence of coefficient groups (54, 58). The decoder (2) further comprises an analyzer (14) for analyzing the GCLI value (10) of each Nthcoefficient group so as to determine a run (101, 102, 103) of coefficient groups (54, 58), wherein a run (101, 102, 103) starts at any one of the Nthcoefficient groups, wherein N is greater or equal than 2. According to the invention, the decoding unit (12) is configured to decode the data (8) on the coefficients (50, 51, 52, 53) being part of a run (101, 102, 103) by using an escape decoding mechanism and to decode the data (8) on coefficients (50, 51, 52, 53) not being part of a run (101, 102, 103) by using the GCLI values (10) in order to obtain the image data (4).
Materia: Electricidad
CIP: H04N19/132 (2006.01); H04N19/136 (2006.01); H04N19/182 (2006.01); H04N19/463 (2006.01); H04N19/593 (2006.01); H04N19/93 (2006.01)
CPC: H04N19/463 (EP); H04N19/593 (EP); H04N19/93 (EP); H04N19/132 (EP); H04N19/136 (EP); H04N19/176 (EP); H04N19/182 (EP); H04N19/436 (EP); H04N19/645 (EP)