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    • 4. 发明授权
    • Image display unit capable of tone reproduction
    • 能够进行色调再现的图像显示单元
    • US4622595A
    • 1986-11-11
    • US678877
    • 1984-12-06
    • Masayuki HisatakeHaruhiko MoriguchiToshiharu InuiAkio Noguchi
    • Masayuki HisatakeHaruhiko MoriguchiToshiharu InuiAkio Noguchi
    • B41J2/52B41J2/205H04N1/405H04N1/40H04N1/21H04N1/23
    • H04N1/4057
    • An image reproducing apparatus wherein a halftone of an image is reproduced by repeating a picture element pattern composed of a plurality of dots as a unit and each dot display density of which is gradually controlled. The repetition of the same picture element patterns is avoided to improve tone reproducing performance.The image display unit includes a means for determining a disposition of dots composing a specific picture element pattern, i.e., display density of each dot in response to tone density of the original image, a means for comparing the disposition of dots of the specific picture element pattern determined by said means with a dot disposition or dispositions of one or plural surrounding picture element pattern or patterns, and a means for changing the dot disposition of said specific picture element pattern in the case when it is identical with dot dispositions of a predetermined number or more of surrounding picture element patterns.
    • 一种图像再现装置,其中通过将由多个点组成的像素图案重复为一个单位并逐渐控制其每个点显示密度来再现图像的半色调。 避免重复相同的图像元素图案以改善色调再现性能。 图像显示单元包括用于确定构成特定图像元素图案的点的布置的装置,即响应于原始图像的色调密度的每个点的显示密度,用于比较特定图像元素的点的布置的装置 由所述装置确定的图案,其具有点布置或一个或多个周围图像元素图案或图案的布置,以及用于在与预定数量的点布置相同的情况下改变所述特定图素元素图案的点布置的装置 或更多的周围图像元素图案。