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    • 6. 发明授权
    • Image forming apparatus
    • 图像形成装置
    • US5081528A
    • 1992-01-14
    • US674305
    • 1991-03-25
    • Kimiyoshi HayashiHitoshi AraiKazuhiko HirookaToshio HonmaKenichi Takeda
    • Kimiyoshi HayashiHitoshi AraiKazuhiko HirookaToshio HonmaKenichi Takeda
    • G03G9/08G03G13/01G03G13/09H04N1/29H04N1/40H04N1/405H04N1/50
    • H04N1/506G03G13/013G03G13/09G03G9/0819H04N1/29H04N1/40037H04N1/4056
    • In an image forming apparatus for forming an ordinary copy or a tonality image for an original image for a printing press, original image data is divided into data within a predetermined area and that outside the area, and pixel density within the area is subjected to a density conversion in accordance with screen half-toning information which will increase density information toward the approximate center of these pixels, by way of example. The original image data or the density-converted image data is converted into a binary-coded signal conforming to the density, and an output image is formed in accordance therewith. Preferably, plural types of non-linear correction tables are provided and a tone-conversion is performed selecting an appropriate correction table for each pixel, or for each line, of the density-converted image data. Preferably, the original image data is binary coded by a pattern signal having a long period, and the density-converted image data is binary coded by a pattern signal having a short period. The foregoing is applied to color-separated image data of each color. Preferably, the image data is divided, in accordance with color, into predetermined areas having the same or a different number of pixels, or into predetermined areas having a planar phase which differs for each color, and a screen angle is applied thereto.
    • 在用于形成用于印刷机的原始图像的普通复印件或调色剂图像的图像形成装置中,原始图像数据被划分为预定区域内的区域内的数据,并且区域内的像素密度经受 根据将通过示例将密度信息朝向这些像素的近似中心增加的屏幕半色调信息进行密度转换。 原始图像数据或密度转换图像数据被转换为符合密度的二进制编码信号,并且根据其形成输出图像。 优选地,提供多种类型的非线性校正表,并且对密度转换图像数据的每个像素或每行选择适当的校正表,并进行色调转换。 优选地,原始图像数据由具有长周期的图案信号二进制编码,并且密度转换的图像数据由具有短周期的图案信号进行二进制编码。 上述内容适用于每种颜色的分色图像数据。 优选地,根据颜色将图像数据划分为具有相同或不同数量像素的预定区域,或划分成具有对于每种颜色不同的平面相位的预定区域,并且对其施加屏幕角度。