Image analysis – Image compression or coding – Interframe coding
Patent
1994-06-10
1996-10-22
Boudreau, Leo
Image analysis
Image compression or coding
Interframe coding
382240, 348413, 348416, G06K 936, G06K 946
Patent
active
055685692
ABSTRACT:
A method and apparatus for encoding a target image within a sequence of one or more digital motion video images using motion compensation. Displacement vectors are assigned to a plurality of blocks in the target image. First and second block groups are selected from the plurality of blocks, the first and second block groups having corresponding first and second displacement vectors assigned thereto. A first error measure associated with predicting the second block group using the second displacement vector is determined. A second error measure associated with predicting the second block group using said first displacement vector is determined. An error change is obtained from the first and second error measures. A merge-factor is obtained from the error change. The second block group is reassigned to the first displacement vector if the merge-factor is less than a merge-threshold. Alternatively, displacement vectors are assigned to a plurality of parent blocks in the target image. Each parent block is divided into a plurality of target blocks. A target block is selected, and a plurality of parent blocks are associated therewith. A plurality of error measures are calculated by successively applying the displacement vector assigned to each associated parent block to the selected target block. The displacement vector associated with the minimum error measure is assigned to the selected target block if the minimum error measure is below a threshold. The target image is encoded in accordance with the displacement vectors currently assigned thereto.
REFERENCES:
patent: 5028996 (1991-07-01), Takahashi et al.
patent: 5151784 (1992-09-01), Lavagetto et al.
Boudreau Leo
Intel Corporation
Murray William H.
Tran Phuoc
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