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In this example, a man is waving his arm and the best matched block is a rotated block in the reference frame.
Note that matched blocks are denoted with gray and they have been matched in previous matching steps, because variance of the matched block is larger than those of neighboring blocks.
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Hierarchical OBME/MC is conducted when a SAD value between two matched blocks is smaller than the threshold (6000).
Temporal and spatial reference frames are dynamically skipped when their expected numbers of matching blocks are insignificant.
The best matching block is the one that minimizes the criterion MSE (mean square error).
Finally, the best matching block is pasted back into the current frame.
For every such block, the best matching block is found in the reference frames R n, n ∈ {0, 1} within search range sr.
The straightforward method to find the best matching block is a full search block matching algorithm that checks all possible candidates in the search area, which requires a huge computational burden.
Since all the pixels within each matching block are assumed to have the same amount of motion, the is assigned to each pixel within the block.
The search window is 15×15 pixels, with a search range of ±7 and the size of matching block being 8×8 pixels, shown in Table 1.
The best (least distorted, i.e., most matched) candidate block is found, and its displacement (motion vector) is recorded.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com