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1.发明授权Image forming apparatus which excels in reproducibility of colors, fine lines and gradations even in a copy made from a copied image 失效图像形成装置即使在由复印图像制成的复印件中也能够在颜色，细线和灰度的再现性方面表现出色公开(公告)号：US06388768B2
公开(公告)日：2002-05-14
申请号：US09020281
申请日：1998-02-09
IPC分类号： B41B100
CPC分类号： H04N1/6033 , G03G15/01 , G03G2215/00042 , G03G2215/00063 , G03G2215/018 , H04N1/4078
摘要： An image forming apparatus for forming an image with few defects even when making a copy from a copied image. When forming an image, a standard pattern is formed outside the image forming area in accordance with standard pattern data for color correction. When reading the image together with the standard pattern formed above, the color correction conditions for the image data are modified in accordance with the comparison result between the read standard pattern data and the standard pattern data for color correction. Copying is then performed on a copying paper.
摘要翻译： 一种图像形成装置，即使在从复印图像进行复制时也可以形成缺陷少的图像。 当形成图像时，根据用于颜色校正的标准图案数据，在图像形成区域外部形成标准图案。 当与上述形成的标准图案一起读取图像时，根据读取的标准图案数据和用于颜色校正的标准图案数据之间的比较结果来修改图像数据的颜色校正条件。 然后在复印纸上进行复印。
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公开(公告)号：US5933255A
公开(公告)日：1999-08-03
申请号：US610713
申请日：1996-03-04
CPC分类号： B41J2/471 , B41J2/525 , H04N1/40037
摘要： In a digital image forming apparatus, when a latent image is formed on a photoconductor by modulating optical intensity of laser beam, the laser beam is emitted in a period of a duty ratio while modulated according to image data, and the image is formed on a sheet of paper. This process is repeated for four colors for a color document. The duty ratio, defined as a ratio of a light-emitting time of a light exposing the photoconductor to a period for exposing a dot, is changed in the same document. For example, the light emission timing pattern is changed between odd and even lines. In another example, the light-emission timings may be changed at least for one of the reproduction colors. The light-emission timing patterns may be provided for each of reproduction colors. The light-emission timing patterns may be changed to have a constant or different screening angle between colors. Image quality of a half-tone image is improved by using such patterns.
摘要翻译： 在数字图像形成装置中，当通过调制激光束的光强度在感光体上形成潜像时，在按照图像数据进行调制的情况下，在占空比的周期内发射激光束，并且图像形成在 一张纸。 对于彩色文档，为四种颜色重复此过程。 定义为曝光光电导体的光的发光时间与曝光点的周期的比率的占空比在相同的文献中改变。 例如，发光定时图案在奇数行和偶数行之间改变。 在另一示例中，至少对于一种再现颜色可以改变发光定时。 可以为每种再现颜色提供发光定时图案。 发光定时图案可以改变为在颜色之间具有恒定或不同的屏幕角度。 通过使用这种图案可以提高半色调图像的图像质量。
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公开(公告)号：US5999279A
公开(公告)日：1999-12-07
申请号：US807746
申请日：1997-02-27
CPC分类号： H04N1/58
摘要： An image forming apparatus which forms an image according to image data made up of pixel data on colors of pixel constituting an original image, characterized by comprising a color region discriminator for determining to which color region each pixel data belongs, an image region discriminator for determining whether the pixel data belongs to a uniform density region or whether it belongs to an edge portion, a corrective condition deciding unit for determining MTF corrective conditions for the image data of each color region depending on the discrimination results of both the color region discriminator and the image region discriminator, and an MTF correction unit for performing MTF corrections on the image data according to the MTF corrective conditions determined by the corrective condition deciding unit.
摘要翻译： 一种图像形成装置，其根据由构成原始图像的像素的颜色的像素数据构成的图像形成图像，其特征在于包括：颜色区域鉴别器，用于确定每个像素数据属于哪个颜色区域;图像区域鉴别器，用于确定 是否像素数据属于均匀密度区域或是否属于边缘部分;校正条件判定单元，用于根据颜色区域鉴别器和色彩区域鉴别器的鉴别结果确定每个颜色区域的图像数据的MTF校正条件; 图像区域鉴别器和MTF校正单元，用于根据由校正条件判定单元确定的MTF校正条件对图像数据执行MTF校正。
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公开(公告)号：US6028957A
公开(公告)日：2000-02-22
申请号：US812811
申请日：1997-03-06
CPC分类号： G06T5/20
摘要： Pixel data comprising density data of R, G, and B obtained by reading an original with a CCD image sensor are subjected to shading correction by a shading correction unit, and then converted into color region signals H*, V, and C* in the Munsell color space by a first converter. According to the variations of V, a region discriminator determines whether each pixel data belongs to an edge portion of the original image or whether it belongs to a uniform density region of the original image. A noise removing unit performs noise removal by performing smoothing on color region signals H*, V, and C* of the pixel data which have been determined to belong to uniform density regions. A second converter converts the noise-removed color region signals into pixel data of R, G, and B.
摘要翻译： 通过用CCD图像传感器读取原稿获得的包含R，G和B的浓度数据的像素数据通过阴影校正单元进行阴影校正，然后转换为颜色区域信号H *，V和C * 孟塞尔颜色空间由第一个转换器。 根据V的变化，区域鉴别器确定每个像素数据是否属于原始图像的边缘部分，或者它是否属于原始图像的均匀密度区域。 噪声去除单元通过对已经被确定属于均匀密度区域的像素数据的颜色区域信号H *，V和C *执行平滑来执行噪声去除。 第二转换器将噪声消除的颜色区域信号转换成R，G和B的像素数据。
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公开(公告)号：US5966222A
公开(公告)日：1999-10-12
申请号：US822354
申请日：1997-03-20
CPC分类号： H04N1/6027 , H04N1/6033
摘要： The individual pattern of each color of the standard pattern is printed on a copy being made, and when the copy is read by a scanner, the image data of the standard pattern are converted into color region signals in a uniform color space by an HVC converter and a C.multidot.H operation unit. In the case where the saturation of the image data has become lower than the standard saturation of the color region, saturation corrective coefficients are determined by a saturation corrective coefficient calculation unit. After the saturation coefficients have been determined for each color of the standard pattern, the image data of the original are read out, and the saturation corrective coefficients for the color region of the image data are used for saturation correction by a saturation correction processing unit. The image data which have been subjected to the saturation correction are reversely converted into the image data of each color by a reverse HVC converter. According to the reversely converted image data, an image is formed on a copying paper.
摘要翻译： 标准图案的每种颜色的单独图案被印刷在正在进行的副本上，并且当通过扫描仪读取副本时，标准图案的图像数据由HVC转换器转换成均匀颜色空间中的颜色区域信号 和一个CxH操作单元。 在图像数据的饱和度变得低于彩色区域的标准饱和度的情况下，饱和校正系数由饱和度校正系数计算单元确定。 在针对标准图案的每个颜色确定饱和系数之后，读出原稿的图像数据，并且通过饱和度校正处理单元将图像数据的颜色区域的饱和校正系数用于饱和度校正。 已经进行饱和校正的图像数据被反向HVC转换器反向转换成每种颜色的图像数据。 根据反向转换的图像数据，在复印纸上形成图像。
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公开(公告)号：US5715067A
公开(公告)日：1998-02-03
申请号：US610231
申请日：1996-03-04
CPC分类号： H04N1/40037
摘要： In a digital image forming apparatus, when a latent image is formed on a photoconductor, a light from a light source is emitted in a period of a duty ratio while modulated according to image data, and the latent image is developed and transferred onto a sheet of paper. The duty ratio, defined as a ratio of a light-emitting time of a light exposing the photoconductor to a period for exposing a dot, is changed in the same document according to dot information on the document such as an edge signal. In the modulation of the optical intensity, the light emission onto the photoconductor is performed with a duty ratio which may be set for each dot. Image portions formed with different duty ratios may exist at the same time in a reproduced image. For example, an edge portion in a document is reproduced at the duty ratio of 100% while a non-edge portion is reproduced at the duty ratio less than 100%.
摘要翻译： 在数字图像形成装置中，当在感光体上形成潜像时，根据图像数据调制来自光源的光在占空比的周期中发射，并且潜像显影并转印到片材上 的纸。 定义为曝光光电导体的光的发光时间与曝光点的时间的比率的占空比根据诸如边缘信号的文档的点信息在相同的文档中改变。 在光强度的调制中，以可以为每个点设置的占空比来执行光电导体上的发光。 形成有不同占空比的图像部分可以在再现图像中同时存在。 例如，以100％的占空比再现文档中的边缘部分，而以小于100％的占空比再现非边缘部分。
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7.发明授权Image formation apparatus exposing photoconductor according to image density data to form image thereon 失效图像形成装置根据图像浓度数据曝光光电导体以在其上形成图像
公开(公告)号：US5949963A
公开(公告)日：1999-09-07
申请号：US814920
申请日：1997-03-12
CPC分类号： H04N1/40037 , B41J2/471 , H04N1/407
摘要： In a digital full color copying machine, one pixel on a photoconductor is divided into four subdivided small pixels. Functions a-d are assigned to each subdivided small pixel. Functions a-d are linear functions with density data as a parameter. The slope of functions a-d becomes smaller in sequential order. Exposure data of the four subdivided small pixels is calculated according to the density data of a pixel and functions a-d to expose each subdivided small pixel. A peak can be established in the exposure amount distribution to form a deeper latent image. Accordingly, resolution and graininess of the halftone area are improved.
摘要翻译： 在数字全彩色复印机中，光电导体上的一个像素被分成四个细分的小像素。 函数a-d被分配给每个细分的小像素。 函数a-d是密度数据作为参数的线性函数。 函数a-d的斜率按顺序变小。 根据像素的密度数据计算四个细分的小像素的曝光数据，并且对a-d进行功能，以暴露每个细分的小像素。 可以在曝光量分布中建立峰以形成更深的潜像。 因此，改善了半色调区域的分辨率和颗粒度。
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公开(公告)号：US5995248A
公开(公告)日：1999-11-30
申请号：US821364
申请日：1997-03-20
CPC分类号： H04N1/58 , H04N1/4092
摘要： A test pattern comprising a half-tone pattern portion and an edge pattern portion printed according to standard printing data is read by a CCD sensor. A pattern discriminator detects the positions of the half-tone pattern portion and the edge pattern portion. In accordance with a prescribed edge detection criteria using the primary differential data .DELTA.D of density determined by primary differential filters, the CPU determines whether the inputted image data correspond to a uniform density region or whether the inputted image data correspond to an edge portion. If the region discrimination result is different from the result of the pattern detection, the edge detection criteria are changed. The image data is then subjected to MTF correction, and conditions for smoothing or edge emphasizing are altered so that the difference between the corrected image data and the standard printing data remains within a allowable range.
摘要翻译： 由CCD传感器读取包括根据标准打印数据打印的半色调图案部分和边缘图案部分的测试图案。 模式鉴别器检测半色调图案部分和边缘图案部分的位置。 根据使用由初级差分滤波器确定的浓度的一次差分数据DELTA D的规定边缘检测准则，CPU确定输入的图像数据是对应于均匀密度区域还是输入的图像数据对应于边缘部分。 如果区域识别结果不同于模式检测的结果，则边缘检测准则被改变。 然后对图像数据进行MTF校正，并且改变用于平滑或边缘强调的条件，使得校正图像数据和标准打印数据之间的差异保持在允许范围内。
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9.发明授权Digital image forming apparatus which specifies a sensitivity characteristic of a photoconductor 失效指定光电导体的灵敏度特性的数字图像形成装置
公开(公告)号：US5694223A
公开(公告)日：1997-12-02
申请号：US611718
申请日：1996-03-06
申请人： Kentaro Katori , Toshifumi Watanabe , Yukihiko Okuno , Masaki Tanaka , Hironobu Nakata , Katsuyuki Hirata
发明人： Kentaro Katori , Toshifumi Watanabe , Yukihiko Okuno , Masaki Tanaka , Hironobu Nakata , Katsuyuki Hirata
CPC分类号： G03G15/5041 , G03G15/5037 , H04N1/407 , G03G2215/00042
摘要： A printer control unit carries out a predetermined calculation based on the amount of adhering toner detected by an AIDC sensor and the surface potential of a photoconductor detected by a V sensor to correct the light emission intensity of a light source to prepare light emission characteristic data for .gamma. correction to obtain an optimal image. A .gamma. correcting unit corrects an image signal output from an image signal processing unit using the calculated light emission characteristic data for .gamma. correction to control the light source to emit light based on the corrected data. More specifically, since the .gamma. correction data is obtained by calculation, optimal .gamma. correction can always be carried out without a memory of a large capacity.
摘要翻译： 打印机控制单元基于由AIDC传感器检测到的附着调色剂的量和由V传感器检测的感光体的表面电位进行预定的计算，以校正光源的发光强度，以准备用于 伽马校正以获得最佳图像。 伽马校正单元使用所计算的用于伽马校正的发光特性数据来校正从图像信号处理单元输出的图像信号，以基于校正数据控制光源发光。 更具体地，由于通过计算获得伽马校正数据，所以可以总是在没有大容量的存储器的情况下执行最佳伽马校正。
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10.发明授权Image formation apparatus that allows correction of .gamma. correction data and adjustment method thereof 失效允许校正伽马校正数据的图像形成装置及其调整方法
公开(公告)号：US6094502A
公开(公告)日：2000-07-25
申请号：US816052
申请日：1997-03-11
申请人： Katsuyuki Hirata , Kentaro Katori , Masaki Tanaka
发明人： Katsuyuki Hirata , Kentaro Katori , Masaki Tanaka
CPC分类号： H04N1/4005 , H04N1/4078
摘要： In a copying machine, a printer control unit calculates .gamma. correction data according to a grid potential Vg and a development bias potential Vb which are image forming parameters, and a calculation coefficient. The printer control unit reads reflectance data of a copied test pattern in a test pattern read out mode to correct the calculation coefficient for the calculation of .gamma. correction data according to the read out data. Thus, .gamma. correction at always the optimum and accurate level can be carried out without usage of a memory of a large capacity.
摘要翻译： 在复印机中，打印机控制单元根据作为图像形成参数的电网电位Vg和显影偏压电位Vb以及计算系数来计算伽马校正数据。 打印机控制单元在测试模式读出模式中读取复制的测试图案的反射率数据，以根据读出的数据校正用于计算伽马校正数据的计算系数。 因此，可以在不使用大容量的存储器的情况下始终实现最佳和精确的水平的伽马校正。
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