JOHN C SMITH
Social Work in Cambridge, MA
License number
Massachusetts 202809
Issued Date
Apr 27, 1981
Expiration Date
Oct 1, 1986
Type
Licensed Certified Social Worker
Address
Address
Cambridge, MA 02138
Professional information
Apparatus For Generating An Image From A Digital Video Signal
US Patent:
RE38942, Jan 24, 2006
Filed:
Jan 24, 1991
Appl. No.:
07/645398
Inventors:
Jean M. Riseman - Cambridge MA, US
John J. Smith - Cambridge MA, US
Alice M. d'Entremont - Boston MA, US
Craig E. Goldman - Natick MA, US
John J. Smith - Cambridge MA, US
Alice M. d'Entremont - Boston MA, US
Craig E. Goldman - Natick MA, US
Assignee:
Canon Inc. - Tokyo
International Classification:
H04N 1/40
US Classification:
358 312, 358280, 358283, 358298
Abstract:
An apparatus for generating a high quality image from a digital video signal includes a system for gamma correcting the digital video signal with a digital look up table and for converting the resultant digital signal to an analog video signal. Another circuit generates a triangular wave reference pattern signal and a comparator compares the analog video signal with the triangular wave reference pattern signal to form a pulse-width-modulated signal. A raster scanning print engine producing, for example, a laser beam, scans over a recording medium in accordance with the pulse-width-modulated signal, thereby forming an image of high quality on the recording medium of a print engine. This apparatus can also be used with an analog video signal by first converting the analog video signal to a digital video signal with an analog to digital converter.
Apparatus For Generating An Image From A Digital Video Signal
US Patent:
4800442, Jan 24, 1989
Filed:
May 18, 1987
Appl. No.:
7/051154
Inventors:
John H. Riseman - late of Cambridge MA
John J. Smith - Cambridge MA
Alice M. d'Entremont - Boston MA
Craig E. Goldman - Natick MA
John J. Smith - Cambridge MA
Alice M. d'Entremont - Boston MA
Craig E. Goldman - Natick MA
Assignee:
Canon Kabushiki Kaisha - Tokyo
International Classification:
H04N 140
US Classification:
358280
Abstract:
An apparatus for generating a high quality image from a digital video signal includes a system for gamma correcting the digital video signal with a digital look up table and for converting the resultant digital signal to an analog video signal. Another circuit generates a triangular wave reference pattern signal and a comparator compares the analog video signal with the triangular wave reference pattern signal to form a pulse-width-modulated signal. A raster scanning print engine producing, for example, a laser beam, scans over a recording medium in accordance with the pulse-width-modulated signal, thereby forming an image of high quality on the recording medium of a print engine. This apparatus can also be used with an analog video signal by first converting the analog video signal to a digital video signal with an analog to digital converter.
John Lucian Smith, Cambridge MA - Lawyer
Address:
25b Inman Pl, Cambridge 02139
Licenses:
New York - Currently registered 2009
Education:
University of Virginia School of Law