| 摘要 |
A method and device for image processing free from a deficiency in entire vector in a gray image comparatively low in gray level. An N*N mask matrix is generated, based on a given gray level, for an N*N dither matrix used in an area gradation method which reproduces a gray image from binary image data based on multivalue image data; in a case of an N*N mask matrix comparatively low in gray level, rearrangements on column and row bases are effected (N*N-1) times to generate (N*N-1) pieces of N*N mask matrices which are then combined with the original N*N mask matrix to generate (N*N) * (N*N) mask matrices. Then, a binary gray image is generated, for a gray image comparatively low in gray level, from multivalue image data via the (N*N) * (N*N) mask matrices.
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