Koninklijke Philips Corporation N.v.

U.S. Philips Corporation

Ipg Electronics 503 Limited

Cornelis A M Jaspers

In a color signal matrix adjustment method, a single first color signal matrix related value is adjusted (VAC) to obtain a color signal matrix adjustment, and at least two color signal matrix parameters other than the single first color signal matrix related value are automatically adapted (AAC) in dependence upon the color signal matrix parameter adjustment.

Color signal matrix adjustment

In a method of histogram equalization of an image signal (Y), a histogram of the image signal (Y) is determined (HC), the image signal (Y) is processed (HP) in dependence upon the histogram to obtain a modified signal (Ymod), and the modified signal (Ymod) is enhanced (E) where said modified signal (Ymod) falls below said image signal (Y). Preferably, the enhancement (E) is color saturation (RGBsat) dependent.

Histogram equalization

In a method of interpolating an output color signal (Go) of a given color in dependence on an input signal (RGBin) having first values of the given color which are influenced by a first other color and second values of the given color which are influenced by a second other color, an intermediate color signal (Gc&prime;) is interpolated ( ) at positions where no signal of the given color is present, an average value (avG) of the given color is generated ( ) in dependence upon both the first and second values, and the output color signal (Go) is furnished ( ) in dependence upon both the intermediate color signal (Gc&prime;) and the average value (avG).

Color signal interpolation

In a method of generating output color signals (Ro, Go, Bo) and determining a contour signal (cont) from a sensor signal (RGBin) obtained by a sensor having a color filter with alternately colored filter elements, the sensor signal (RGBin) is delayed (1H) over at least one row period; for each color, zero values are inserted at locations corresponding to the locations of differently colored filter elements; a plurality of mutually at least one row-delayed color signals (nxG, nxR, nxB) with inserted zeros is furnished; the plurality of mutually at least one row-delayed color signals (nxG, nxR, nxB) with inserted zeros is filtered (FR, FG, FB) to obtain the output color signals (Ro, Go, Bo), and the plurality of mutually at least one row-delayed color signals (nxG, nxR, nxB) with inserted zeros is filtered (Fcont) to obtain the contour signal (cont).

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Eindhoven, Netherlands

Cornelis A M Jaspers