Compression and reconstruction of radiological images
CA 2097951 C · Owner: Stenstrom, James T. · Inventors: Stenstrom, James T.; Wilson, Dennis L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides for a compression scheme (10) tailored to the compression of large radiological images processed with image processing workstations. The compression scheme (10) is a variation of the CCITT JPEG compression scheme with special care taken to suppress blocking effects of the 8x8 discrete cosine, transform used therein. In accordance with the present invention an original , image, (11) is downsampled (12) then interpolated (14) back to its original size resulting in a, smoothed image (14a). The difference (13) between the smoothed image (14a) and the, original image (11) is then compressed (15) using an 8x8 discrete cosine transform, with 12 bit data. Major …
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 June 8, 1993 and granted August 17, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 8, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 8, 2015.
- 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.