2nd September 2018, 20:44
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#14
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Registered User
Join Date: Mar 2011
Posts: 4,829
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Quote:
Originally Posted by Katie Boundary
But the quantizer was being railroaded. Q-pel was using more bits to preserve the same level of detail.
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How did you determine "the same level of data"?
https://en.wikipedia.org/wiki/Quarter-pixel_motion
Quarter-pixel motion (also known as Q-pel motion or Qpel motion) refers to using a quarter of the distance between pixels (or luma sample positions) as the motion vector precision for motion estimation and motion compensation in video compression schemes. It is used in many modern video coding formats such as MPEG-4 ASP, H.264/AVC, and HEVC. Though higher precision motion vectors take more bits to encode, they can sometimes result in more efficient compression overall, by increasing the quality of the prediction signal.
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