Mode coding method in a binary shape encoding

Details Mode coding method in a binary shape encoding Mode coding method in a binary shape encoding

1997-10-27

2000-04-11

Rao, Andy

Pulse or digital communications

Bandwidth reduction or expansion

Television or motion video signal

348404, 348415, 348413, 382236, 382239, H04N 712, H04N 1102

Patent

active

060495677

ABSTRACT:
In a mode coding method in encoding a binary alpha block (BAB) within a current frame based on the current frame and a previous frame including a plurality of BAB's, the BAB within the current frame is sub-sampled to generate a sample block and then a reconstructed BAB is reconstructed based on the sample block. In an intra mode, after evaluating the difference between the reconstructed BAB and the BAB, if there is no difference therebetween, a first mode signal is generated and if otherwise, a second mode signal is generated and at the same time a second error data block representing the difference is generated. In an inter mode, besides performing the process in the intra mode described above, a BAB most similar to the BAB within the current frame among the BAB's within the previous frame is detected as a predicted BAB and then the difference between the BAB and the predicted BAB is evaluated. And if there is no difference therebetween, a third mode signal is generated and if otherwise, a fourth mode signal is generated and at the same time a fourth error data block representing the difference is generated. If two or more mode signals among the first to fourth signals are generated, one mode signal among them is selected as a selected mode signal according to a predetermined selection rule.

REFERENCES:
patent: 5883977 (1999-03-01), Kim
patent: 5969764 (1999-10-01), Sun et al.
patent: 5974184 (1999-10-01), Elfrig et al.
patent: 5978510 (1999-11-01), Chung et al.

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