Research on Bilevel Rendition of Gray Pictures on Jacquard

According to the jacquard technology, we present an enhanced halftoning algorithm for which the filter weights and the quantizer thresholds vary depending on input pixel value. This minimization brings the Fourier spectra of the selected key intensity levels as close as possible to the corresponding "blue noise" spectra. The continuity of the algorithm\´s behavior across the full range of intensity levels is achieved thanks to smooth interpolation between the distribution coefficients corresponding to key levels. The algorithm get the ideal bi-pattern with reasonable ordered statistic and Blue-Noise spectrum characteristic, and obtain the aesthetic feeling settle for people\´s vision.