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Definition of "video coding" |
compression of moving images. Coding can be done purely on an Intraframe (within-frame) basis, using a still image coding algorithm, or by exploiting temporal correlations between frames (interframe coding). In the latter case, the encoder estimates motion between the current frame and a previously-coded reference frame, encodes a field of motion vectors that describe the motion compactly, generates a motion compensated prediction image and codes the difference between this and the actual frame with an intraframe residue coder—typically the 8 × 8 discrete cosine transform. The decoder receives the motion vectors and encoded residue, constructs the prediction picture from its stored reference frame and adds back the difference information to recover the frame. |
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