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:
Jul. 17, 2007
Filed:
Jun. 11, 2003
Image processing method and image processing apparatus utilizing luminance histograms, and projector
Masato Nishizawa, Chino, JP;
Masato Nishizawa, Chino, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
The invention provides an image processing method, an image processing apparatus, and a projector which determine a scene-change so as to perform an optimal tone conversion, luminance correction, or the like, for each scene of a moving image. An image processing apparatus includes a normalized-luminance-histogram computing unit to compute a normalized luminance histogram for each frame, histogram buffers to store normalized luminance histograms of respective comparing frames, a scene-change-detecting reference-value computing unit to compute scene-change-detecting reference values α and β corresponding to correlations between two normalized luminance histograms of the first and second frames respectively stored in the histogram buffers, and a scene-change determining unit to determine whether a change in scenes between images of the first and second frames has occurred or not, in accordance with the scene-change-detecting reference values α and β.