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    • 7. 发明专利
    • Image processing apparatus
    • JP3787890B2
    • 2006-06-21
    • JP11655296
    • 1996-05-10
    • ブラザー工業株式会社
    • 康成 吉田
    • H04N1/405H04N1/401
    • PROBLEM TO BE SOLVED: To generate a pseudo halftone image in which no blank part is generated at an edge part where the density changes rapidly from a high density to a low density. SOLUTION: In the case of generating image data with a pseudo halftone by an image data generating means (S100, S120, S140) to binarize a density of each picture element of a halftone image through the error diffusion method, when a density change discrimination means (S110, S150, S160) discriminates it that a density (input density I) of a picture element of interest in the halftone image is a prescribed density or less and discriminates it that the difference of the input density I between the picture element of interest and a picture element adjacent to the picture element of interest among the picture elements having been already binarized is larger than a prescribed value, in place of a substantial error distributed to the input density I of the picture element of interest attended with dinarization of other picture elements than the picture element of interest, error data prepared corresponding to the picture element of interest by an error data preparation means (S130) are added to the input density I of the picture element of interest.