The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 13, 1990
Filed:
Aug. 28, 1989
Applicant:
Inventor:
Clifford B Cantrell, North Garden, VA (US);
Assignee:
Sperry Marine Inc., Charlottesville, VA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04N / ; H04N / ;
U.S. Cl.
CPC ...
358166 ; 358177 ; 358 37 ;
Abstract
A video camera system has a modulation transfer function (MTF). Video image data are stored in frame grabbers and converted in a digital signal processor from the image domain to the spatial domain by a two-dimensional digital Fourier transform. The spatial data are filtered by a two-dimensional aperture correction filter that has an MTF inverse to the uncorrected system MTF. The filtered spatical data are converted back into the image domain by a two-dimensional inverse digital Fourier transform. The two-dimensional digital aperture correction filter is stored in the form of software in the digital signal processor.