Image analysis – Image compression or coding – Adaptive coding
Patent
1997-12-05
2000-04-11
Couso, Yon J.
Image analysis
Image compression or coding
Adaptive coding
382236, G06K 936
Patent
active
060496312
ABSTRACT:
In an apparatus and method for encoding a binary alpha block (BAB) of binary pixels within a current frame based on the current frame and a previous frame including a plurality of BAB's, the BAB is adaptively encoded, wherein each frame has a top field and a bottom field and each BAB has a top BAB-field and a bottom BAB-field. If all of the binary pixels within a BAB within the current frame are defined either as background pixels or as object pixels, the BAB is encoded on a BAB-by-BAB basis and if otherwise, checks the binary pixels of the top BAB-field and the bottom BAB-field of the BAB. Namely, if all of the binary pixels within at least one of the top BAB-field and the bottom BAB-field are defined either as background pixels or as object pixels, it is decided to encode the BAB on a BAB-field by BAB-field basis, if otherwise, ME is performed on the top BAB-field and the bottom BAB-field based on the top field and the bottom field of the previous frame. An then, based on the result of the ME, it is decided to encode the BAB either on a BAB-by-BAB basis or on a BAB-field by BAB-field basis according to a predetermined decision rule to enhance the coding efficiency thereof.
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patent: 5929915 (1999-07-01), Cho
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Couso Yon J.
Daewoo Electronics Co. Ltd.
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