Abstract: A method for implementing a filter on a signal is disclosed wherein interval membership information is computed and stored in such a manner so as to use a minimal amount of memory thereby allowing filter computation by a small number of deterministic sequence of table lookups and bit-wise logical operations. In general, the present invention involves using a non-linear filter represented as a plurality of intervals and the discrete values a sample may take. Each sample corresponds to a component in a vector. Each interval is comprised of a lower and upper vector. Each sample value is compared to the lower and upper values of the sample's associated coordinate. A table for that sample is then constructed with binary entries where a ‘1’ denotes that a sample value is within the lower and upper values of the coordinate and ‘0’ denoting otherwise. A table is built for each sample.

Abstract: A transmissive, backlit color twisted-nematic or super-twisted-nematic liquid crystal display employing a front fiber-optic faceplate or optical equivalent as a front retaining element of a liquid crystal cell that increases viewing angle between the display and a viewer while minimizing or eliminating undesirable variations in luminance, contrast ratio and chromaticity is described. In particular, the fiber-optic faceplate or optical equivalent includes cylindrical optical features and interstitial cladding material. The interstitial cladding material may include an opaque mask blocking layer to prevent the interstitial apertures from diffracting off-axis light into an observer's viewing cone. Further, the interstitial cladding material may be opaque.

Abstract: A dense black image is formed by printing the black ink in combination with at least one other ink without resulting in thick, blurred figure edges. A bitmap of binary information is provided for each of a plurality of color separations, each bitmap indicating desired locations of ink spots for a color separation. Spots are eroded on the boundaries of black areas in the black bitmap to form a modified black bitmap. The modified black bitmap is printed in at least one color other than black at the same time that the bitmaps for the color separations other than black are printed. The black bitmap is then printed in black over the printed modified black bitmap to yield a dense black image.