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:
Jan. 31, 2012
Filed:
Mar. 29, 2005
Yoshiki Ono, Tokyo, JP;
Kazuhiro Sugiyama, Tokyo, JP;
Yoshiki Ono, Tokyo, JP;
Kazuhiro Sugiyama, Tokyo, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
The present invention relates to a technique for correcting tones of a digitized image, for use in a mobile terminal or the like. The use of a conventional image tone correction technique to backlight correction imposes a limit on improvement in local contrast in a bright region or a dark region. According to the present invention, a block timing generation part () divides one image area into a plurality of blocks, an average luminance calculation part () calculates an average luminance level per block specified at the part, a correction-amount-per-block calculation part () calculates a direction of correction and a correction amount from an average luminance level per block, a correction-amount-per-pixel calculation part () interpolates the correction amount per block into the correction amount per pixel in that block, and a tone conversion part () reads out a final correction amount from a tone conversion table part (), using the correction amount per pixel and luminance data of that pixel read out from a memory () as an address, to carry out tone conversion.