Device for digitizing original digital image using error diffusion coefficients has dispersal device that disperses digitized pixel value for updated input pixel to adjacent pixel for update

摘要

The device has an updating device, a digitizing device, a threshold modulator and a dispersal device. The dispersal device disperses the digitized pixel value for the updated input pixel to the adjacent pixel so that the updated information for the adjacent pixel is entered to the updating device on the basis of the digitization error of the current pixel and an error diffusion coefficient described by a matrix. The device has an updating device (110) for an entered pixel value, a digitizing device (120) for the updated pixel value using a defined threshold value, a digitization error detection device for the output image with the digitized pixel value, a threshold modulator (140) using the input pixel value and the output image and a dispersal device (150). The dispersal device disperses the digitized pixel value for the updated input pixel to the adjacent pixel so that the updated information for the adjacent pixel is entered to the updating device on the basis of the digitization error of the current pixel and an error diffusion coefficient described by a matrix. Independent claims are also included for the following: a threshold modulation method with zigzag digitization.