Method of coding an arbitrary shape of an object when all pixels

Details Method of coding an arbitrary shape of an object when all pixels Method of coding an arbitrary shape of an object when all pixels

1998-04-21

2000-11-21

Au, Amelia

Image analysis

Image compression or coding

Shape, icon, or feature-based compression

37524008, 382239, G06K 936, G06K 948

Patent

active

061514136

ABSTRACT:
A method of coding an object of an arbitrary shape. The arbitrary shape coding method includes the steps of: (a) determining whether or not a shape in a video object layer (VOL) is an arbitrary shape; (b) calculating the size of a video object plane (VOP) in each frame if the shape in the VOL is determined as being an arbitrary shape in the step (a); (c) coding information of each frame about whether or not all macroblocks in the VOP are opaque; (d) coding the VOP in macroblock units if the shape of each frame is determined not to be all opaque in the step (c); and (e) coding only motion and texture information in the VOP, by macroblock, if the shape in the VOL is determined to be a non-arbitrary shape in the step (a) or if the shape in the VOP in a frame is determined as all opaque in step (c). Therefore, when all pixels of the entire display region are used as the texture of the object, the coding of the arbitrary shape can be achieved by coding only 1-bit information per VOP, without the need for transmission of the shape information requiring 1.about.3 bits per macroblock. Also, the number of modules required for the coding based on a macroblock is reduced from 4 to 2, thereby reducing the amount of calculation for encoding.

REFERENCES:
patent: 5748789 (1998-05-01), Lee et al.
patent: 5926572 (1999-07-01), Kim et al.
patent: 5991447 (1999-11-01), Eifrig et al.
Sikora, The MPEG-4 Video Standard Verification Model, Feb. 1997, p. 19-31, IEEE Transactions on c>>.quadrature. cuits and systems for video technology, vol. 7, No. 1.

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