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:
Oct. 31, 1978
Filed:
Dec. 07, 1976
Applicant:
Inventors:
Jean-Pierre Graf, Zurich, CH;
Tino Celio, Ambri, CH;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04N / ; H04N / ;
U.S. Cl.
CPC ...
358107 ; 3401 / ; 356124 ; 358130 ; 364515 ;
Abstract
Method and apparatus for determining the sharpness of a picture through evaluation of the absolute values of the density differences between adjacent points of the image in at least one selected area of the image. The absolute values are measured and compared with at least two threshold values. The absolute difference values obtained as a result of the comparison are then counted when they exceed the threshold values. The counts thus obtained are compared with reference count values to produce a decision output and when a plurality of decision outputs are obtained, these are combined to arrive at a decision as to the sharpness of the image.