| 摘要 |
<p>A method of electrically processing an image using an error diffusion method of propagating density distribution errors produced in pixels provided on the periphery of a pixel to be noted in the image formed so that respective adjacent pixels (a, b) thereof extending in a main scanning direction are different in area from each other, to the noted pixel and representing a density output at the noted pixel in binary form. The method comprises the following steps of previously calculating thresholds (Th1, Th2) of densities each corresponding to the ratio between the respective pixels, selecting, as a pixel to be noted (f), any unitary one (a, b) of the adjacent pixels, which are different in ratio from each other, calculating errors (E) produced in the peripheral pixels, which are propagated to the noted pixel (f), according to respective distances between the individual peripheral pixels and the noted pixel and areas of the individual peripheral pixels, adding each of the propagated errors to a density of the noted pixel so as to effect a rearrangement (f') on the density of the noted pixel, comparing the rearranged density of noted pixel with each of thresholds obtained according to the noted pixel so as to obtain a corresponding level (G) represented in binary form, and obtaining density distribution errors (e) based on the ratio between the respective adjacent pixels, the rearranged density (f') noted pixel and the level (G) represented in binary form. <IMAGE></p> |
