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:
Aug. 19, 2008
Filed:
Oct. 28, 2005
Naoto Abe, Tokyo, JP;
Kohei Inamura, Kanagawa, JP;
Osamu Sagano, Tokyo, JP;
Hiroshi Saito, Kanagawa, JP;
Takeshi Ikeda, Kanagawa, JP;
Naoto Abe, Tokyo, JP;
Kohei Inamura, Kanagawa, JP;
Osamu Sagano, Tokyo, JP;
Hiroshi Saito, Kanagawa, JP;
Takeshi Ikeda, Kanagawa, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An image data processing circuit includes a first circuit for calculating an average picture level value of the image data, a multiplier for multiplying a coefficient by the image data, a second circuit for calculating a first coefficient for the multiplier based upon the average picture level value, and a third circuit for calculating a second coefficient for the multiplier. The second coefficient is calculated so that the result of multiplying (1) image data having a value over an input range of a circuit to which data from the multiplier is inputted, and (2) the second coefficient falls in the input range. In addition, a selection circuit selects the coefficient to be used in the multiplier from the first coefficient calculated by the second circuit and the second coefficient calculated by the third circuit.