Pollock, Vande Sande & Priddy
Image processing apparatus with correction of diffusion errors of overlapping dots
 An image processing apparatus in which, when a multi-tone image is printed by using an error diffusion technique, error data to be diffused is modified so that the tone level of the image data as printed varies linearly with variation of an input image data. A printed dot of a pixel has a larger area than that of the theoretical pixel so that the dot juts out into adjacent pixels. The error data to be diffused is modified in consideration of jut-out dot areas of adjacent pixels, so as to obtain a linear variation of the tone-level with variation of the input image data. 
Nippon Steel Corporation
H
H04N
inventional
Akira Yasuhiko Hiroto
Higashide Takahashi Yamada