Wide dynamic range video camera
CA 1207891 A · Owner: National Aeronautics And Space Administration · Inventors: Craig, Glenn D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A television camera apparatus wherein bright objects are attenuated to fit within the dynamic range of the system while dim objects are not receives linearly polarized light from an object scene, the light being passed by a beamsplitter and focused on the output plane of a liquid crystal light valve oriented such that, with no excitation from a cathode ray tube, all light is rotated 90° and focused on the input plane of a video sensor. The light is then converted to an electrical signal, which is amplified and used to excite the CRT. The resulting image is collected and focused onto the light valve, which rotates the polarization vector of each light increment to an extent proportional to …
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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
- Granted July 15, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 15, 2003.
- 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.