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:
May. 07, 1996
Filed:
Feb. 28, 1994
Masahiro Takeshima, Ibaraki, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
An automatically adjustable black stretch control apparatus for a continually adjusting the black stretch of a luminance signal which comprises a black stretch control means for controlling the amount of stretch of the black part of the luminance signal. A luminance signal is input to a plurality of detecting means, each of which detects the percentage of the luminance signal that is within a specified range during a unit period (i.e. a frame). The output of each detecting means is input to one of a plurality of preprocessing means which generates a control index. The output of each preprocessing means is input to one of a plurality of inferring means for creating a synthesized function indicative of the quality of the signal from each of the detecting means. The black stretch control output determining means receives the output of each of the plurality of inferring means and determines the median value of the inferring means signals to determine the amount the black stretch of the luminance signal must be compensated in order to provide an optimum picture. Finally, the black stretch compensation amount control means controls the compensation amount of the black stretch control means according to the compensation amount calculated by the black stretch control output determining means.