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1. WO2011096869 - DE-BLOCKING FILTERING CONTROL

Publication Number WO/2011/096869
Publication Date 11.08.2011
International Application No. PCT/SE2010/051494
International Filing Date 29.12.2010
Chapter 2 Demand Filed 28.11.2011
IPC
H04N 7/26 2006.1
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
7Television systems
24Systems for the transmission of television signals using pulse code modulation
26using bandwidth reduction
H04N 7/50 2006.1
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
7Television systems
24Systems for the transmission of television signals using pulse code modulation
26using bandwidth reduction
50involving transform and predictive coding
CPC
H04N 19/117
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
19Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
10using adaptive coding
102characterised by the element, parameter or selection affected or controlled by the adaptive coding
117Filters, e.g. for pre-processing or post-processing
H04N 19/14
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
19Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
10using adaptive coding
134characterised by the element, parameter or criterion affecting or controlling the adaptive coding
136Incoming video signal characteristics or properties
14Coding unit complexity, e.g. amount of activity or edge presence estimation
H04N 19/176
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
19Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
10using adaptive coding
169characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
17the unit being an image region, e.g. an object
176the region being a block, e.g. a macroblock
H04N 19/182
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
19Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
10using adaptive coding
169characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
182the unit being a pixel
H04N 19/82
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
19Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
80Details of filtering operations specially adapted for video compression, e.g. for pixel interpolation
82involving filtering within a prediction loop
H04N 19/86
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
19Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
85using pre-processing or post-processing specially adapted for video compression
86involving reduction of coding artifacts, e.g. of blockiness
Applicants
  • TELEFONAKTIEBOLAGET L M ERICSSON (publ) [SE]/[SE] (AllExceptUS)
  • NORKIN, Andrey [RU]/[SE] (UsOnly)
  • ANDERSSON, Kenneth [SE]/[SE] (UsOnly)
  • PRIDDLE, Clinton [SE]/[AU] (UsOnly)
Inventors
  • NORKIN, Andrey
  • ANDERSSON, Kenneth
  • PRIDDLE, Clinton
Agents
  • AROS PATENT AB
Priority Data
61/301,73205.02.2010US
61/305,00516.02.2010US
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) DE-BLOCKING FILTERING CONTROL
(FR) COMMANDE DE FILTRAGE À DÉGROUPAGE
Abstract
(EN) First and second filter decision values are calculated for a pixel block (10) in a video frame. The first filter decision value is representative of how smoothpixel values in a first line of pixels (11, 13, 15, 17) in the block (10) and in a corresponding first line of pixels (21, 23, 25, 27) in a neighboring pixel block (20) in the video frame are in a direction parallel to a filtering direction. The second filter decision value is representative of how close pixel values in a current line (12) of pixels (11, 13, 15, 17) in the block (10) approximate a flat line and how close pixel values in a corresponding current line (22) of pixels (21, 23, 25, 27) in the neighboring block (20) approximate a flat line. The two filter decision values are compared to respective thresholds and a strong de-blocking filter is selected for the current line (12) if the filter decision values are below the thresholds, otherwise a weak de-blocking filter is selected to combat any blocking artifacts.
(FR) Une première et une deuxième valeur de décision de filtre sont calculées pour un bloc de pixels (10) d'une trame vidéo. La première valeur de décision de filtre représente dans quelle mesure les valeurs de pixels lisses d'une première ligne de pixels (11, 13, 15, 17) du bloc (10) et d'une première ligne correspondante de pixels (21, 23, 25, 27) d'un bloc (20) de pixels voisin de la trame vidéo sont parallèles à une direction de filtrage. La deuxième valeur de décision de filtre représente la proximité des valeurs de pixels d'une ligne actuelle (12) de pixels (11, 13, 15, 17) du bloc (10) par rapport à une ligne plate, et la proximité des valeurs de pixels d'une ligne actuelle correspondante (22) de pixels (21, 23, 25, 27) du bloc voisin (20) par rapport à une ligne plate. Les deux valeurs de décision de filtre sont comparées à des seuils respectifs, et un filtre de dégroupage fort est sélectionné pour la ligne actuelle (12) si les valeurs de décision de filtre sont inférieures aux seuils; sinon, un filtre de dégroupage faible est sélectionné pour traiter les artéfacts de groupage.
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