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:
Jun. 20, 2006
Filed:
Sep. 03, 2002
Mineki Soga, Aichi, JP;
Keiichi Yamada, Aichi, JP;
Mitsuhiko Ohta, Aichi, JP;
Kabushiki Kaisha Toyota Chuo Kenkyusho, Aichi-gun, JP;
Abstract
In an image conversion method and apparatus, luminance Yof each pixel of a converted image is obtained by use of an expression Y=CY+CYand from luminance Yof a corresponding pixel of a source image, luminance Yof a corresponding pixel of a low frequency image, and Cand Cwhich are functions of the luminance Y. Since C+Cis constant when Y≦T, contrast of a low frequency component can be prevented from decreasing. In a portion in which the luminance Yof the low frequency image is low, the low frequency image is enhanced. In a portion in which the luminance Yof the low frequency image is high, the low frequency image is suppressed. In a method and apparatus for detecting noise level of an original signal in real time, a plurality of local regions are set on an input image in such a manner that the local regions are distributed uniformly over the entire area of an image. In each local region, determination as to whether or not luminance is saturated is performed. Variation in luminance is detected in each of a plurality of unsaturated local regions. Noise level is determined on the basis of the detected variation.