Image analysis – Image enhancement or restoration – Intensity – brightness – contrast – or shading correction
Reexamination Certificate
2006-06-20
2006-06-20
Mehta, Bhavesh M. (Department: 2624)
Image analysis
Image enhancement or restoration
Intensity, brightness, contrast, or shading correction
C358S520000
Reexamination Certificate
active
07065257
ABSTRACT:
In an image conversion method and apparatus, luminance Y3of each pixel of a converted image is obtained by use of an expression Y3=C1Y1+C2Y2and from luminance Y1of a corresponding pixel of a source image, luminance Y2of a corresponding pixel of a low frequency image, and C1and C2which are functions of the luminance Y2. Since C1+C2is constant when Y2≦T2, contrast of a low frequency component can be prevented from decreasing. In a portion in which the luminance Y2of the low frequency image is low, the low frequency image is enhanced. In a portion in which the luminance Y2of 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.
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Ohta Mitsuhiko
Soga Mineki
Yamada Keiichi
Kabushiki Kaisha Toyota Chuo Kenkyusho
Mehta Bhavesh M.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Perungavoor Sath V.
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