Research On Digital Halftoning Technique

Digital halftoning technique,which is on basis of human visual attribution and color characteristic of image,is the tone rendition technology of transforming an image with greater amplitude resolution to one with lesser amplitude on two levels or on finite levels by mathematics and computer. The technology has widely applied to typography,textile,printing technology,compression memory of digital image,transmission of digital image and medicine etc. The research of digital halftoning technique is important in realistic significance and application value.The paper describes the contents below: 1.A new fast error diffusion. The algorithm is faster than the universally used Floyd-Steinberg algorithm,while maintaining its original simplicity; 2. Adaptive digital halftoning algorithm base on the image visual characteristics. The algorithm set the parameters of eye filters according to local image characteristics for each pixel,then the smoothness and sharpness of halftoned image can be controlled,and image quality is increased. 3. A new method to evaluate halftoned image quality that depends on the visual perception characteristics. Effectiveness of the proposed approach is demonstrated through experiments using real data.