Technology Offer of TU Berlin

Temporal Trajectory Filter

Patent #10052/TUB
Background
Video encoding methods save motion vector fields locally in a buffer to predict the following frames, thus reducing the size of the error pattern that is needed to decode the frames. Besides, this so-called motion-compensated prediction further reduces noise by reducing the signal-to-noise-ratio (SNR), regardless of the bit rate. Prior art is a spatial approach that reduces edge artifacts from blocking.
Technical Description
The present method combines the spatial approach with a temporal trajectory filter to reduce noise as well as the data rate. Noise is filtered along temporal trajectories for every pixel which has two-dimensional coordinates describing the motion of pixels from frame to frame. The algorithm used here is less efficient for sources with a high quantizer, therefore an automatic shutoff is implemented for quantizers above 45. With the help of this new in-loop filtering algorithm, the picture quality could be improved considerably. This was proofed by the inventors using the H.264/AVC codec. In this way it was possible to reach a bit rate reduction up to 12 % (the average being 4 %).
Possible Applications
Video software industry, Online video portals
Exemplary embodiment of the temporal trajectory filter
Benefits
  1. Bit rate reduction
  2. Noise suppression
  3. Easy to apply
Technology Readiness Level Prototype system (TRL: 6)
Property Rights
approved: US
Patent Holder
Technische Universit├Ąt Berlin
Possible Cooperation
  • R&D Cooperation
  • Patent Purchase
  • Licensing
Contact Details
Ina Kr├╝gerTechnology Transfer Manager
+49 (0)30 314-75916ina.krueger@tu-berlin.de
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