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    Image processing method and apparatus and image forming method and apparatus using the same
    16.
    发明授权
    Image processing method and apparatus and image forming method and apparatus using the same 失效

    公开(公告)号：US06304341B1

    公开(公告)日：2001-10-16

    申请号：US09429492

    申请日：1999-10-29

    申请人： Jun Koide ,  Nobuatsu Sasanuma ,  Yuichi Ikeda

    发明人： Jun Koide ,  Nobuatsu Sasanuma ,  Yuichi Ikeda

    IPC分类号： H04N1405

    CPC分类号： H04N1/4057 ,  H04N1/4056

    摘要： An image can be outputted with a high sharpness without deteriorating a resolution. In order to output an image of a high picture quality while suppressing the occurrence of a moire, an exposure amount is modulated in accordance with pixel density information of the image divided into pixels of a predetermined size by an exposure amount modulating unit in a light scanning unit, thereby expressing an image dark/light state. In this case, in a highlight density region in which a pixel density is equal to or less than ⅓ of the maximum image density, the density data of two adjoining pixels is modulated by one pixel and the other pixel is not recorded. In a density region in which the image density lies within a range from ⅓ to ½ of the maximum image density, a part of the density data of one of the two adjoining pixels is transposed to the other pixel. In a density region in which the image density is equal to or larger than ½ of the maximum density, the pixel transposition is not performed.

    Image forming apparatus
    17.
    发明授权
    Image forming apparatus 失效
    图像形成装置

    公开(公告)号：US5859933A

    公开(公告)日：1999-01-12

    申请号：US728166

    申请日：1996-10-09

    申请人： Nobuatsu Sasanuma ,  Yuichi Ikeda

    发明人： Nobuatsu Sasanuma ,  Yuichi Ikeda

    IPC分类号： G03G15/00 ,  H04N1/40 ,  H04N1/407 ,  H04N1/60 ,  G06K9/00

    CPC分类号： G03G15/5062 ,  H04N1/40006 ,  H04N1/4078 ,  H04N1/6033 ,  G03G2215/00067

    摘要： When a gradation test pattern is read a predetermined period of time after the gradation test pattern was fixed, the correction amount can be controlled based on a stable image density, and an image with good gradation characteristics can be formed. A gradation test pattern including all color patterns is output in accordance with a gradation test pattern registered in a test pattern memory area, and at the same time, a timer is started. After an elapse of a predetermined period of time stored in a RAM, the output gradation test pattern is read by an original reader. On the basis of the read image density, a .gamma.-LUT is set.

    摘要翻译： 当在固定灰度测试图案之后的预定时间段读取灰度测试图案时，可以基于稳定的图像浓度来控制校正量，并且可以形成具有良好灰度特性的图像。 根据登记在测试图案存储区域中的灰度测试图案输出包括所有颜色图案的灰度测试图案，同时启动定时器。 存储在RAM中经过预定时间段之后，由原始读取器读取输出灰度测试图案。 根据读取的图像浓度，设置γ-LU。

    System for correcting image density of an image forming system based on a detection result of a test image
    18.
    发明授权
    System for correcting image density of an image forming system based on a detection result of a test image 失效
    基于测试图像的检测结果来校正图像形成系统的图像浓度的系统

    公开(公告)号：US5583644A

    公开(公告)日：1996-12-10

    申请号：US172106

    申请日：1993-12-23

    申请人： Nobuatsu Sasanuma ,  Hisashi Fukushima ,  Tetsuya Atsumi

    发明人： Nobuatsu Sasanuma ,  Hisashi Fukushima ,  Tetsuya Atsumi

    IPC分类号： B41J2/52 ,  G03G15/00 ,  G03G21/00 ,  H04N1/407 ,  H04N1/00 ,  G03F3/08 ,  H04N1/29 ,  H04N1/46

    CPC分类号： G03G15/5062 ,  G03G15/5041 ,  H04N1/4078 ,  G03G2215/00042

    摘要： An image forming system includes a generator for generating an image signal representing a predetermined test image having a plurality of tone levels, an image forming device for forming the predetermined test image on a recording medium based on the signal, a first measuring device for measuring density levels of the formed predetermined test image, corresponding to each of the plurality of tone levels of the image signal, a controller for determining characteristics of a change of density levels in the predetermined test image to a change of tone levels in the image signal based on a plurality of density levels measured by the first measuring device, and for making a conversion data table for converting tone levels of an input image signal in accordance with the characteristics, a designator for generating instructions for designation a correction of the conversion data table, a transferring device for transferring the image formed on the recording medium to a recording sheet, a second measuring device for measuring density levels of the image on the recording sheet, wherein the controller controls the generator, the image forming device, and the transferring devices to correct the conversion data table based on the density levels measured by the second measuring device.

    摘要翻译： 图像形成系统包括：发生器，用于产生表示具有多个音调电平的预定测试图像的图像信号;基于该信号在记录介质上形成预定测试图像的图像形成装置;用于测量密度的第一测量装置 形成的预定测试图像的水平对应于图像信号的多个音调电平中的每一个;控制器，用于基于图像信号中的图像信号中的浓度水平的变化来确定预定测试图像中的浓度水平的变化 由第一测量装置测量的多个密度级别，并且用于根据特性制作用于转换输入图像信号的音调电平的转换数据表，用于产生用于指定转换数据表的校正的指令的指示符， 转印装置，用于将形成在记录介质上的图像转印到记录纸上 用于测量记录片材上的图像的浓度水平的测量装置，其中控制器控制发生器，图像形成装置和转印装置，以基于由第二测量装置测量的密度水平校正转换数据表。

    In an image processing system, an image processing apparatus and method for stabilizing output image quality by controlling image forming parameters
    19.
    发明授权
    In an image processing system, an image processing apparatus and method for stabilizing output image quality by controlling image forming parameters 失效
    在图像处理系统中，通过控制图像形成参数来稳定输出图像质量的图像处理装置和方法

    公开(公告)号：US5579090A

    公开(公告)日：1996-11-26

    申请号：US371214

    申请日：1995-01-11

    申请人： Nobuatsu Sasanuma ,  Yuichi Ikeda

    发明人： Nobuatsu Sasanuma ,  Yuichi Ikeda

    IPC分类号： G03G15/00 ,  H04N1/407 ,  H04N1/60

    CPC分类号： G03G15/5041 ,  H04N1/4078 ,  H04N1/6033

    摘要： An object of the present invention is the forming over a long period of time of images that have a desirable density and gradation.According to the present invention, an image pattern, at the maximum image density, is formed on a photosensitive drum and read by a detection unit that incorporates an LED and a photosensor. Based on the read-out data, an image forming condition is corrected so that a maximum density is slightly higher than a target maximum density. Further, an image pattern that shows density gradations is formed on the photosensitive drum, and is read by the detection unit. Based on the read-out data, the image forming condition is corrected so that the gradation characteristic is stable. With these corrections, even if the density characteristic and the gradation characteristic of the photosensitive drum are changed, the initial preferable state of the output density range can be maintained, and stable gradation characteristics for print effects that range from highlighting to shadowing is constantly ensured.

    摘要翻译： 本发明的目的是长时间形成具有期望的密度和灰度的图像。 根据本发明，在感光鼓上形成最大图像浓度的图像图案，并且由包含LED和光电传感器的检测单元读取。 基于读出的数据，校正图像形成条件，使得最大密度略高于目标最大密度。 此外，在感光鼓上形成显示密度梯度的图像图案，并由检测单元读取。 基于读出数据，修正图像形成条件，使得灰度特性稳定。 通过这些校正，即使改变感光鼓的浓度特性和灰度特性，也可以保持输出密度范围的初始优选状态，并且不断地确保从突出显示到阴影范围的打印效果的稳定的灰度特性。