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. 20, 2009
Filed:
Mar. 01, 2005
Kousei Sugimoto, Kanagawa, JP;
Kousei Sugimoto, Kanagawa, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
To obtain an excellent edge enhancement effect even when dynamic γ correction processing is executed for an edge-enhanced image signal, and to obtain an excellent edge enhancement effect for various γ-characteristics. An edge component is detected from an input image signal. A γ correction curve is calculated based on characteristics of an image scene detected by a scene characteristic detector, and its data is stored in a dynamic γ correction RAM table and an inverse gradient RAM table. A gain controller multiplies the edge component by a control signal from the inverse gradient RAM table to generate an edge enhancement signal which is in turn added to the image signal to obtain an edge-enhanced signal. The inverse gradient RAM table sends an inverse number of a gradient of a γ correction curve corresponding to a signal level of the inputted image signal as the control signal to the gain controller. An edge-enhanced signal becomes an image signal for which dynamic γ correction is performed in accordance with a dynamic γ correction RAM table to be outputted.