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    Image forming system and calibration method for image forming conditions
    1.
    发明授权
    Image forming system and calibration method for image forming conditions 失效
    图像形成系统和图像形成条件的校准方法

    公开(公告)号：US06172771B2

    公开(公告)日：2001-01-09

    申请号：US09062505

    申请日：1998-04-20

    申请人： Yuichi Ikeda ,  Nobuatsu Sasanuma ,  Tetsuya Atsumi ,  Yasuhiro Saito

    发明人： Yuichi Ikeda ,  Nobuatsu Sasanuma ,  Tetsuya Atsumi ,  Yasuhiro Saito

    IPC分类号： H04N100

    CPC分类号： H04N1/6055

    摘要： A system which utilizes plural image forming apparatus, equalizes gradation characteristics of images commonly output from such plural image forming apparatus. When the system includes three color copying apparatus, at first a test pattern image based on data from a pattern generator is output from the color copying apparatus. The prepared image is read by the reader of the color copying apparatus, and, based on the read data, the correction data of a table (LUT) are calibrated for obtaining density data for a laser beam. The calibration of the correction data of the color copying apparatus are conducted in a similar manner using, however, the reader of the same copying apparatus for reading the test pattern. It is therefore, rendered possible to exclude the influence of the difference in the reader characteristics on the calibration, and to equalize the gradation characteristics when the copying apparatus are used as printers.

    摘要翻译： 利用多个图像形成装置的系统，均衡从这种多个图像形成装置共同输出的图像的灰度特性。 当系统包括三色复印设备时，首先从彩色复印设备输出基于来自图案发生器的数据的测试图案图像。 准备的图像由彩色复印装置的读取器读取，并且基于读取的数据，对表（LUT）的校正数据进行校准，以获得用于激光束的浓度数据。 然而，使用用于读取测试图案的相同复印设备的读取器，以类似的方式进行彩色复印设备的校正数据的校准。 因此，可以排除读取器特性的差异对校准的影响，并且使复印装置用作打印机时的灰度特性相等。

    Image processing apparatus and method
    2.
    发明授权
    Image processing apparatus and method 失效
    图像处理装置及方法

    公开(公告)号：US06535302B1

    公开(公告)日：2003-03-18

    申请号：US09144449

    申请日：1998-09-01

    申请人： Yuichi Ikeda ,  Nobuatsu Sasanuma ,  Tetsuya Atsumi ,  Yasuhiro Saito

    发明人： Yuichi Ikeda ,  Nobuatsu Sasanuma ,  Tetsuya Atsumi ,  Yasuhiro Saito

    IPC分类号： H04N1407

    CPC分类号： H04N1/407

    摘要： When pixels in a two-dimensional matrix are divided into lines A and B in the column (or row) direction (sub-scanning direction) and two neighboring pixels in the row (or column) direction are subjected to gradation correction respectively using characteristic curves for lines A and B, the characteristic curve for line B unpreferably has a stepwise characteristic portion having a step when it is stored in an LUT, due to quantization errors unique to digital values. Hence, the characteristic curve for line A is set to be decreased by the amount corresponding to the step.

    摘要翻译： 当二维矩阵中的像素被分成行（或行）方向（副扫描方向）的行A和B，并且行（或列）方向上的两个相邻像素分别使用特性曲线 对于线A和B，由于数字值唯一的量化误差，线B的特性曲线优选地具有逐步特征部分，当其存储在LUT中时具有步骤。 因此，将线A的特性曲线设定为与步骤对应的量减少。

    Image processing apparatus and method
    4.
    发明授权
    Image processing apparatus and method 失效
    具有补偿输出装置特性的功能的图像处理装置和方法

    公开(公告)号：US06184915B2

    公开(公告)日：2001-02-06

    申请号：US08890648

    申请日：1997-07-09

    申请人： Tetsuya Atsumi ,  Nobuatsu Sasanuma ,  Yuichi Ikeda ,  Yasuhiro Saito

    发明人： Tetsuya Atsumi ,  Nobuatsu Sasanuma ,  Yuichi Ikeda ,  Yasuhiro Saito

    IPC分类号： B41J247

    CPC分类号： H04N1/6055

    摘要： An image forming apparatus forms an image on a medium by using an output device. A pattern signal for forming a predetermined pattern image on the medium is generated, and image forming parameters for the output device are determined on the basis of the density of the pattern image formed on the medium. The determined image forming parameters are transmitted via bidirectional communication to an external computer or other image forming apparatus.

    摘要翻译： 图像形成设备通过使用输出设备在介质上形成图像。 产生用于在介质上形成预定图案图像的图形信号，并且基于形成在介质上的图案图像的密度来确定用于输出装置的图像形成参数。 所确定的图像形成参数通过双向通信传输到外部计算机或其它图像形成装置。

    Image processing apparatus and method
    7.
    发明授权
    Image processing apparatus and method 有权
    图像处理装置及方法

    公开(公告)号：US06519054B1

    公开(公告)日：2003-02-11

    申请号：US09287313

    申请日：1999-04-07

    申请人： Yuichi Ikeda ,  Nobuatsu Sasanuma ,  Tetsuya Atsumi

    发明人： Yuichi Ikeda ,  Nobuatsu Sasanuma ,  Tetsuya Atsumi

    IPC分类号： G06F1500

    CPC分类号： H04N1/4078 ,  G06K15/1209 ,  G06K15/1223

    摘要： When maximum density of an output image is lowered by a gamma correction, the number of tones is reduced and the tonality of the output image declines. In order to solve this problem, a pattern generator (215) is caused to generate a toned pattern and the gain of a D/A converter of a PWM circuit (212) is controlled so as to output a test pattern having a density ranging from maximum pulse width Pff(50%) to maximum pulse width Pff(100%) for each color component (step S1). Image information that has been read (step S2) from the test pattern is converted to density information (step S3), and Pff is set (step S4) from the relationship between Pff and image density based upon coordinate information provided by the test pattern.

    摘要翻译： 当通过伽马校正降低输出图像的最大浓度时，音调的数量减少并且输出图像的音调下降。 为了解决这个问题，使图形发生器（215）产生色调图案，并且控制PWM电路（212）的D / A转换器的增益，以输出密度范围从 每个颜色分量的最大脉冲宽度Pff（50％）到最大脉冲宽度Pff（100％）（步骤S1）。 已经从测试图案读取的图像信息（步骤S2）被转换为浓度信息（步骤S3），并且基于由测试图案提供的坐标信息，通过Pff和图像浓度之间的关系来设置Pff（步骤S4）。

    Image processing method and apparatus and image forming method and apparatus using the same
    8.
    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
    9.
    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。

    In an image processing system, an image processing apparatus and method for stabilizing output image quality by controlling image forming parameters
    10.
    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。