ABSTRACT
Digital halftoning refers to the process of converting a continuous-tone image or photograph into a pattern of black and white picture elements for reproduction by a binary display device such as an ink jet printer, which can only choose to print or not print dots. When analog halftoning was perfected in 1880, continuous-tone, monochrome photographs were reproduced as line drawings authored by highly skilled craftsmen, usually on scratch board. Later versions of the halftoning process employed screens made of glass that were coated, on one side, by an opaque substance. In the decade that followed the publishing of Digital Halftoning, much technological advancement was documented directly addressing the creation of blue-noise. The human visual system is modeled as a low-pass filter, and by employing it into the halftoning algorithm, causes same colored dots to be spread as far apart as possible, creating a power spectrum that models blue-noise.
