Intensity correction device
CA 2072234 C · Owner: Matsushita Electric Industrial Co. Ltd. · Inventors: Okumura, Naoji; Izawa, Yosuke
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to an intensity correction device for automatically adjusting an intensity of an input video signal to an optical image by detecting luminance characteristics of the input signal, and provide intensity correction with maintaining a clear image by reducing magnitude of the correction signal or by not effecting correction when the luminance level of the input luminance signal is concentrated to a certain luminance level. The intensity correction device includes a histogram memory a, look-up table operating circuit, a look-up table a maximum, value detecting circuit, and an invertor and a multiplier limiter, or a gain control circuit. By this when a, luminance level of …
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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 24, 1992 and granted April 21, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 24, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 24, 2014.
- 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.