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公开(公告)号：US5495278A
公开(公告)日：1996-02-27
申请号：US304666
申请日：1994-09-09
申请人： Yasuhiro Oda , Kazuhiko Arai , Kazuhiro Iwaoka
发明人： Yasuhiro Oda , Kazuhiko Arai , Kazuhiro Iwaoka
CPC分类号： H04N1/4056 , H04N1/29
摘要： In an image forming apparatus including a pulse-width modulating unit for subjecting an image-density signal to pulse-width modulation and an image-forming unit for forming an image in accordance with a pulse-width modulation signal outputted by the pulse-width modulating unit, an arrangement is provided such that the image is formed with a small number of lines when the image density is a low density, while the image is formed with a large number of lines when the image density is a medium/high density. In an example of the arrangement thereof, the pulse-width modulating unit has a unit for effecting modulation on the basis of a plurality of different modulation periods, and is provided with a selecting unit for selecting a modulation period of a pulse-width modulated wave to be outputted, in accordance with the image-density signal.
摘要翻译： 在包括用于对图像浓度信号进行脉冲宽度调制的脉冲宽度调制单元和用于形成图像的图像形成单元的图像形成设备中，所述图像形成单元根据由脉冲宽度调制输出的脉冲宽度调制信号 单元，提供了一种布置，使得当图像浓度为低密度时，图像形成有少量的线，而当图像密度为中/高密度时，图像形成有大量的线。 在其布置的示例中，脉冲宽度调制单元具有用于基于多个不同调制周期进行调制的单元，并且设置有选择单元，用于选择脉宽调制波的调制周期 根据图像浓度信号输出。
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公开(公告)号：US5764378A
公开(公告)日：1998-06-09
申请号：US544703
申请日：1995-10-18
申请人： Yasuhiro Oda , Kazuhiko Arai , Kazuhiro Iwaoka , Takayuki Yamashita , Masayo Higashimura , Masahiko Kubo
发明人： Yasuhiro Oda , Kazuhiko Arai , Kazuhiro Iwaoka , Takayuki Yamashita , Masayo Higashimura , Masahiko Kubo
CPC分类号： H04N1/4056
摘要： The present invention provides an image forming apparatus including first image density signal converter having a first conversion property for converting a multi-valued image density input signal to an image density output signal at a timing synchronizing with an image density signal clock, second image density signal converter having a second conversion property different from the first conversion property for converting a part of the image density input signal corresponding to a low density portion to an image density output signal indicating a value within a range in which an image is not developed, selection signal generator for outputting a selection signal having a period longer than that of the image density signal clock to select the first or second image density signal converter in a predetermined order, a phase of the selection signal being shifted in turn per every one or more main scanning synchronizing signals, pattern signal generator means for generating a pattern signal having a period longer than that of the image density signal clock, controller for shifting the phase of the pattern signal generated by the pattern signal generator means per every one or more main scanning synchronizing signals to form a screen image having a predetermined screen angle, a pulse width modulator for outputting a pulse width modulation signal generated by modulating pulse width of the image density output signal output from the first and second image density signal converter utilizing the pattern signal. An image is formed in accordance with the pulse width modulation signal output from the pulse width modulator.
摘要翻译： 本发明提供一种图像形成装置，包括：第一图像浓度信号转换器，具有第一转换特性，用于在与图像浓度信号时钟同步的定时将多值图像浓度输入信号转换为图像浓度输出信号，第二图像浓度信号 转换器具有不同于第一转换特性的第二转换特性，用于将对应于低密度部分的图像浓度输入信号的一部分转换为指示图像未被显影的范围内的值的图像浓度输出信号，选择信号 发生器，用于输出具有比图像浓度信号时钟的周期长的周期的选择信号，以按预定顺序选择第一或第二图像浓度信号转换器，选择信号的相位依次按照每一个或多个主扫描 同步信号，用于产生模式信号的模式信号发生器装置 l具有比图像浓度信号时钟长的时间段的控制器，用于根据每个一个或多个主扫描同步信号移位由图案信号发生器装置产生的图形信号的相位，以形成具有预定屏幕角度的屏幕图像， 脉冲宽度调制器，用于输出通过利用图案信号调制从第一和第二图像浓度信号转换器输出的图像浓度输出信号的脉冲宽度产生的脉宽调制信号。 根据从脉宽调制器输出的脉宽调制信号形成图像。
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公开(公告)号：US5587772A
公开(公告)日：1996-12-24
申请号：US543911
申请日：1995-10-17
申请人： Kazuhiko Arai , Yasuhiro Oda , Masahiko Kubo , Masayo Higashimura , Kazuhiro Iwaoka , Takayuki Yamashita
发明人： Kazuhiko Arai , Yasuhiro Oda , Masahiko Kubo , Masayo Higashimura , Kazuhiro Iwaoka , Takayuki Yamashita
CPC分类号： H04N1/4056
摘要： The present invention provides an image forming apparatus having image signal discrimination device for discriminating whether an image density signal belongs to a line image portion or a natural image portion including a halftone image and outputting a discrimination signal, first image density conversion device having a first conversion property for converting the image density signal to a conversion signal and outputting the conversion signal, second image density conversion device having a second conversion property which is different from the first conversion property for converting a range of the image density signal corresponding to a low density portion to a conversion signal indicating a value within a range in which an image is not developed and outputting the conversion signal, selection device for alternately selecting the first and second image density conversion device with a predetermined period, pulse width modulation device for modulating pulse widths of the conversion signals output from the first and second image density signal conversion device and outputting a pulse width modulation signal, pulse width modulation signal period changing device for changing a period of the pulse width modulation signal output from the pulse width modulation device and the period of selection carried out by the selection device in accordance with the discrimination signal output from the image density signal discriminating device, and image formation device for forming an image in accordance with the pulse width modulation signal output from the pulse width modulation device.
摘要翻译： 本发明提供一种具有图像信号识别装置的图像形成装置，用于鉴别图像浓度信号是属于行图像部分还是包括半色调图像的自然图像部分并输出鉴别信号，第一图像浓度转换装置具有第一转换 用于将图像浓度信号转换为转换信号并输出转换信号的第二图像浓度转换装置，具有与第一转换特性不同的第二转换特性，用于转换对应于低密度部分的图像浓度信号的范围 指示表示图像未被显影的范围内的值并输出转换信号的转换信号，用于以预定周期交替地选择第一和第二图像浓度转换装置的选择装置，用于调制脉冲宽度的脉宽调制装置 转换 从第一和第二图像浓度信号转换装置输出的信号并输出脉冲宽度调制信号，脉冲宽度调制信号周期改变装置，用于改变从脉宽调制装置输出的脉冲宽度调制信号的周期和携带的选择周期 根据从图像浓度信号识别装置输出的识别信号，通过选择装置输出图像形成装置，以及根据从脉宽调制装置输出的脉冲宽度调制信号形成图像的图像形成装置。
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公开(公告)号：US06459502B1
公开(公告)日：2002-10-01
申请号：US09388932
申请日：1999-09-02
IPC分类号： H04N146
CPC分类号： H04N1/58
摘要： The invention provides an image formation device based on the electrophotographic system, whereby, when an outputted image varies from the halftone area to the background area in the sub-scanning direction, the density reduction of a rear end area of the halftone area that borders on the background area can be prevented, by means of simplified and small-scale processing. In this image formation device, a backward edge of the halftone area that borders on the background area is extracted, and an image data value of the background area including m pixels after this backward edge in the sub-scanning direction, of input image data Si, is modified to a setting value with correction data. The setting value is set to a value slightly lower than the threshold value corresponding to the dot area coverage of an image recurrence start point. If there is a halftone area whose image data value given by input image data Sib is greater than the threshold value, or a background area whose image data value is greater than the setting value, in an area including m pixels in the sub-scanning direction after the backward edge of the halftone area given by input image data Sia, the value of the image data with regard to that area will not be modified, and only the value of the image data with regard to the area from the backward edge of the halftone area to that area will be modified to the setting value.
摘要翻译： 本发明提供了一种基于电子照相系统的图像形成装置，当输出的图像从副扫描方向上的半色调区域到背景区域变化时，接近的半色调区域的后端区域的密度降低 可以通过简化和小规模的处理来防止背景区域。 在该图像形成装置中，提取与背景区域相邻的半色调区域的后方边缘，并且输入图像数据Si的背面区域的图像数据值包括在副扫描方向后的后沿之后的m个像素 被修改为具有校正数据的设定值。 设定值被设定为略低于与图像复现开始点的点区域覆盖率对应的阈值的值。 如果存在由输入图像数据Sib给出的图像数据值大于阈值的半色调区域或者图像数据值大于设定值的背景区域，则在副扫描方向上包括m个像素的区域 在由输入图像数据Sia给出的半色调区域的后沿之后，关于该区域的图像数据的值将不被修改，并且只有图像数据的值相对于来自 该区域的半色调区域将被修改为设置值。
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公开(公告)号：US06233062B1
公开(公告)日：2001-05-15
申请号：US08962848
申请日：1997-11-03
IPC分类号： H04N140
CPC分类号： H04N1/3877 , H04N1/40
摘要： It is made possible to prevent decrease in the density due to the image output characteristic of the image output unit in the subscanning direction by means of a method according to the present invention capable of real-time processing without causing the circuit capacity and the memory to be increased. In an image input unit 100, the input image data is acquired so that its time series direction becomes a direction indicated by an arrow 42 corresponding to the subscanning direction of an image output unit 300. The input image data from the image input unit 100 is corrected in accordance with the image output characteristic of the image output unit 300 in the subscanning direction. The image data after the correction is rotationally processed so that its time series direction becomes a direction indicated by an arrow 41 corresponding to the main scanning direction of the image output unit 300. The image data after the rotary processing is sent to the image output unit 300.
摘要翻译： 借助于根据本发明的方法，可以防止图像输出单元在副扫描方向上的图像输出特性导致的密度降低，从而能够实时地处理电路容量和存储器 增加。 在图像输入单元100中，获取输入图像数据，使得其时间序列方向变为与图像输出单元300的副扫描方向对应的箭头42所示的方向。来自图像输入单元100的输入图像数据是 根据副扫描方向上的图像输出单元300的图像输出特性进行校正。 旋转处理校正后的图像数据，使其时间序列方向成为与图像输出部300的主扫描方向对应的箭头41所示的方向。旋转处理后的图像数据被发送到图像输出部 300。
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公开(公告)号：US6014457A
公开(公告)日：2000-01-11
申请号：US958300
申请日：1997-10-27
IPC分类号： B41J2/525 , G03G15/01 , G06T1/00 , G06T5/00 , G06T11/00 , H04N1/46 , H04N1/60 , H04N1/62 , G06K9/00
CPC分类号： H04N1/628 , G06T11/001 , H04N1/603
摘要： An image processing apparatus for converting input color image signals to image recording signals to be sent to an image forming apparatus. The image processing apparatus comprises: a first color converting unit for converting the input color image signals to three-variable color signals independent of devices; a second color converting unit for converting the three-variable color signals to the image recording signals; and a parameter determining unit for determining parameters of the first color converting unit. The parameter determining unit determines the parameters so as to make characteristic colors in the input color image signals coincide with predetermined colors and to maintain linearities of color reproduction characteristics of an output image from the image forming apparatus.
摘要翻译： 一种图像处理装置，用于将输入彩色图像信号转换成图像记录信号，以发送到图像形成装置。 该图像处理装置包括：第一颜色转换单元，用于将输入彩色图像信号转换为独立于设备的三变色信号; 第二颜色转换单元，用于将三变色信号转换成图像记录信号; 以及参数确定单元，用于确定第一颜色转换单元的参数。 参数确定单元确定参数，以使输入彩色图像信号中的特征颜色与预定颜色一致，并且保持来自图像形成装置的输出图像的色彩再现特性的线性。
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