using video object coding

Full Title

Methods or arrangements for coding, decoding, compressing or decompressing digital video signals > using video object coding

Classification Context

Section:

ELECTRICITY

Class:

ELECTRIC COMMUNICATION TECHNIQUE

Subclass:

PICTORIAL COMMUNICATION, e.g. TELEVISION

Scope Notes

Glossary: (Video) Object MPEG-4 object, i.e. a region of the image with arbitrary shape Alpha-plane A discrete bitmap (generally binary) defining the part of a frame constituting a given object, e.g. in terms of the position of the pixels belonging to the object or in terms of the position of the blocks covering the object. Sprite sprites A unified background image derived by compositing the backgrounds of the single frames of a video sequence, e.g. having a camera motion throughout a video segment (within e.g. a scene, a shot, a GOP, a sequence). It may be static or dynamic. Scene description coding The coded representation of the spatiotemporal positioning of audio-visual objects as well as their behaviour in response to interaction, as e.g. in the standard MPEG-4 Part 11. Synthetic/natural hybrid coding Part of the MPEG-4 standard relating to coding facial animation and mesh compression. Synthetic picture component A picture component that is coded by geometric modelling with synthesizing at reconstruction (e.g. avatar). Natural picture component natural picture components A picture component that is coded "as it stands" without geometric modelling.

Child Classifications

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• H04N 19/21 with binary alpha-plane coding for video objects, e.g. context-based arithmetic encoding [CAE]
• H04N 19/23 with coding of regions that are present throughout a whole video segment, e.g. sprites, background or mosaic
• H04N 19/25 with scene description coding, e.g. binary format for scenes [BIFS] compression
• H04N 19/27 involving both synthetic and natural picture components, e.g. synthetic natural hybrid coding [SNHC]
• H04N 19/29 involving scalability at the object level, e.g. video object layer [VOL]