Video and audio coding
CA 2407536 A1 · Owner: Monro, Donald Martin · Inventors: Monro, Donald Martin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of encoding and compressing a video sequence for transmission across , a video channel includes converting the original sequence of frames (O) to a compressed sequence (C) which includes intra-frames predicted frames and , interpolated frames. A sequence of residual images (R) is then determined by subtracting the original frames from the compressed frames. Finally a , spatial/temporal transform is applied to the residual image sequence the , output of which is transmitted across the video channel from the video encoder to a video decoder. A similar approach using a temporal transform on the , residuals may be applied to audio compression.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed January 12, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 12, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 12, 2023.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.