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1.发明授权Image forming apparatus, image forming method, and computer program product that performs skew correction 有权图像形成装置，图像形成方法以及执行偏斜校正的计算机程序产品公开(公告)号：US08488203B2
公开(公告)日：2013-07-16
申请号：US12725760
申请日：2010-03-17
CPC分类号： H04N1/506 , H04N1/3878
摘要： An image forming apparatus includes a skew correcting unit that performs skew correction by dividing an input image that has undergone a halftone process into image data in a predetermined skew correction area in a main scanning direction and by shifting the image data in the skew correction area in a sub-scanning direction; an edge detecting unit that detects whether a pixel at a division position is an edge pixel based on concentrations of a set of pixels including the pixel at the division position; a correction area determining unit that, if detected that the pixel at the division position is the edge pixel, determines a correction area that is an area of pixels including the edge pixel to be subjected to concentration correction within the skew correction area; and an edge correcting unit that corrects concentrations of the pixels within the correction area.
摘要翻译： 图像形成装置包括：偏斜校正单元，其通过将经过半色调处理的输入图像划分为主扫描方向上的预定歪斜校正区域中的图像数据，并且通过将倾斜校正区域中的图像数据移位 副扫描方向; 边缘检测单元，其基于包括分割位置处的像素的像素的集合的浓度来检测分割位置处的像素是否为边缘像素; 校正区域确定单元，如果检测到分割位置处的像素是边缘像素，则确定作为在倾斜校正区域内要进行浓度校正的边缘像素的像素区域的校正区域; 以及校正校正区域内的像素的浓度的边缘校正单元。
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2.发明授权Image correcting device, image forming apparatus, and image correcting method 有权图像校正装置，图像形成装置和图像校正方法公开(公告)号：US07843604B2
公开(公告)日：2010-11-30
申请号：US12000928
申请日：2007-12-19
CPC分类号： H04N1/506 , G06K9/3275 , H04N1/3878
摘要： A pattern generating unit generates correction patterns on a transfer belt. Detection sensors detect the correction patterns, and amounts of magnification correction, amounts of misregistration in the main- and the sub-scanning direction are calculated. The amount of skew between each of colors is then calculated, and a position where an image is divided and a direction for shifting a divided image are determined. Possible dividing-positions are also determined, and a calculated dividing position and each of the possible dividing positions are compared with one another. Then, a possible dividing position closest to the calculated dividing position is set as an actual dividing position.
摘要翻译： 图案生成单元在转印带上产生校正图案。 检测传感器检测校正图案，并且计算倍率校正量，主扫描方向和副扫描方向上的对准量。 然后计算每种颜色之间的偏斜量，并且确定图像被划分的位置和用于移动分割图像的方向。 还可以确定可能的分割位置，并且将计算的分割位置和每个可能的分割位置彼此进行比较。 然后，将最接近计算出的分割位置的可能的分割位置设定为实际的分割位置。
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公开(公告)号：US08320024B2
公开(公告)日：2012-11-27
申请号：US12404601
申请日：2009-03-16
CPC分类号： H04N1/506
摘要： An image forming apparatus capable of minimizing degradation in density correction as a part of skew correction includes a noise-occurrence determining unit, a correction-target-pixel selecting unit, a density correcting unit, and a phase correcting unit. When the noise-occurrence determining unit determines that noise would appear, the density correcting unit performs density correction on a correction target pixel that is determined by the correction-target-pixel selecting unit. The phase correcting unit corrects an output point in time of image data of the density-corrected correction target pixel in a pixel period during which the image data can be output so as to output the image data at a position displaced away from a shift position or toward a shift position.
摘要翻译： 作为偏斜校正的一部分，能够将密度校正的劣化最小化的图像形成装置包括噪声发生判定单元，校正对象像素选择单元，浓度校正单元和相位校正单元。 当噪声发生确定单元确定出现噪声时，浓度校正单元对由校正对象像素选择单元确定的校正目标像素执行浓度校正。 相位校正单元在可以输出图像数据的像素周期中校正经密度校正的校正目标像素的图像数据的输出点，以便将图像数据输出在偏离位置的位置或 朝向班位。
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4.发明申请Image correcting device, image forming apparatus, and image correcting method 有权图像校正装置，图像形成装置和图像校正方法公开(公告)号：US20080174799A1
公开(公告)日：2008-07-24
申请号：US12000928
申请日：2007-12-19
CPC分类号： H04N1/506 , G06K9/3275 , H04N1/3878
摘要： A pattern generating unit generates correction patterns on a transfer belt. Detection sensors detect the correction patterns, and amounts of magnification correction, amounts of misregistration in the main- and the sub-scanning direction are calculated. The amount of skew between each of colors is then calculated, and a position where an image is divided and a direction for shifting a divided image are determined. Possible dividing-positions are also determined, and a calculated dividing position and each of the possible dividing positions are compared with one another. Then, a possible dividing position closest to the calculated dividing position is set as an actual dividing position.
摘要翻译： 图案生成单元在转印带上产生校正图案。 检测传感器检测校正图案，并且计算倍率校正量，主扫描方向和副扫描方向上的对准量。 然后计算每种颜色之间的偏斜量，并且确定图像被划分的位置和用于移动分割图像的方向。 还可以确定可能的分割位置，并且将计算的分割位置和每个可能的分割位置彼此进行比较。 然后，将最接近计算出的分割位置的可能的分割位置设定为实际的分割位置。
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公开(公告)号：US20090213401A1
公开(公告)日：2009-08-27
申请号：US12391360
申请日：2009-02-24
IPC分类号： H04N1/60
CPC分类号： H04N1/506
摘要： An image forming apparatus capable of accurately compensating an increase or decrease of a toner area coverage resulting from shifting that is performed to correct skew is provided. A color density of image data represented by a correction target pixel is corrected such that the increase or decrease in the toner area coverage on the correction target pixel is compensated excluding a toner area coverage on the correction target pixel covered by a toner image that would be formed based on a color density of image data to be represented by a neighboring pixel of the correction target pixel. This effectively reduces banding noise on an output of the image data and prevents degradation in image quality.
摘要翻译： 提供一种能够精确地补偿由于执行以进行纠正而产生的调色剂区域覆盖的增加或减少的图像形成装置。 校正由校正对象像素表示的图像数据的颜色浓度被校正，使得补偿校正对象像素上的调色剂区域覆盖的增加或减少，除去由调色剂图像覆盖的校正对象像素上的调色剂区域覆盖 基于由校正对象像素的相邻像素表示的图像数据的颜色密度形成。 这有效地减少了图像数据的输出上的带状噪声并且防止了图像质量的降低。
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公开(公告)号：US08159722B2
公开(公告)日：2012-04-17
申请号：US12391360
申请日：2009-02-24
IPC分类号： G06T5/00
CPC分类号： H04N1/506
摘要： An image forming apparatus capable of accurately compensating an increase or decrease of a toner area coverage resulting from shifting that is performed to correct skew is provided. A color density of image data represented by a correction target pixel is corrected such that the increase or decrease in the toner area coverage on the correction target pixel is compensated excluding a toner area coverage on the correction target pixel covered by a toner image that would be formed based on a color density of image data to be represented by a neighboring pixel of the correction target pixel. This effectively reduces banding noise on an output of the image data and prevents degradation in image quality.
摘要翻译： 提供一种能够精确地补偿由于执行以进行纠正而产生的调色剂区域覆盖的增加或减少的图像形成装置。 校正由校正对象像素表示的图像数据的颜色浓度被校正，使得补偿校正对象像素上的调色剂区域覆盖的增加或减少，除去由调色剂图像覆盖的校正对象像素上的调色剂区域覆盖 基于由校正对象像素的相邻像素表示的图像数据的颜色密度形成。 这有效地减少了图像数据的输出上的带状噪声并且防止了图像质量的降低。
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公开(公告)号：US09499363B2
公开(公告)日：2016-11-22
申请号：US14587104
申请日：2014-12-31
申请人： Yuu Wakabayashi , Ryo Takenaka , Masashi Satoh , Shingo Nishizaki , Yusuke Ozaki , Yuji Ikeda , Hiroshi Okamura , Naohiro Funada , Tomohide Kondoh
发明人： Yuu Wakabayashi , Ryo Takenaka , Masashi Satoh , Shingo Nishizaki , Yusuke Ozaki , Yuji Ikeda , Hiroshi Okamura , Naohiro Funada , Tomohide Kondoh
CPC分类号： B65H5/068 , B65H7/12 , B65H7/14 , B65H7/20 , B65H2404/144 , G03G15/5029 , G03G2215/00628 , G03G2215/00738
摘要： A sheet thickness detector incorporated in an image forming apparatus includes a sheet conveying member to rotate and convey a sheet in a sheet conveyance direction, a driven sheet conveying member to contact the sheet conveying member and form at least one first transfer nip therebetween in a lateral direction and to displace by an amount equivalent to a thickness of the sheet passing through the first transfer nip and rotated with the sheet conveying member in the sheet conveyance direction, a displacement member to contact the sheet conveying member and form a second transfer nip smaller than the first transfer nip in the lateral direction and to displace by an amount equivalent to the thickness of the sheet passing through the second transfer nip and supported at a support member, and a displacement amount detector to detect an amount of displacement of the displacement member.
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公开(公告)号：US08950750B2
公开(公告)日：2015-02-10
申请号：US13930355
申请日：2013-06-28
申请人： Yuu Wakabayashi , Ryo Takenaka , Masashi Satoh , Shingo Nishizaki , Yusuke Ozaki , Yuji Ikeda , Hiroshi Okamura , Naohiro Funada , Tomohide Kondoh
发明人： Yuu Wakabayashi , Ryo Takenaka , Masashi Satoh , Shingo Nishizaki , Yusuke Ozaki , Yuji Ikeda , Hiroshi Okamura , Naohiro Funada , Tomohide Kondoh
CPC分类号： B65H5/068 , B65H7/12 , B65H7/14 , B65H7/20 , B65H2404/144 , G03G15/5029 , G03G2215/00628 , G03G2215/00738
摘要： A sheet thickness detector incorporated in an image forming apparatus includes a sheet conveying member to rotate and convey a sheet in a sheet conveyance direction, a driven sheet conveying member to contact the sheet conveying member and form at least one first transfer nip therebetween in a lateral direction and to displace by an amount equivalent to a thickness of the sheet passing through the first transfer nip and rotated with the sheet conveying member in the sheet conveyance direction, a displacement member to contact the sheet conveying member and form a second transfer nip smaller than the first transfer nip in the lateral direction and to displace by an amount equivalent to the thickness of the sheet passing through the second transfer nip and supported at a support member, and a displacement amount detector to detect an amount of displacement of the displacement member.
摘要翻译： 并入图像形成装置中的片材厚度检测器包括片材输送构件，用于在片材输送方向上旋转并输送片材，从动片材输送构件与片材输送构件接触，并在其间形成至少一个第一转印区域 方向移动相当于通过第一转印夹持物的片材的厚度的量并且在片材传送方向上与片材传送构件一起旋转的位移构件，与片材传送构件接触并形成小于 第一转印辊隙在横向上移动并且相当于通过第二转印辊隙的片材的厚度并被支撑在支撑构件上的量;以及位移量检测器，用于检测位移元件的位移量。
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公开(公告)号：US20180227150A1
公开(公告)日：2018-08-09
申请号：US15887931
申请日：2018-02-02
CPC分类号： H04L25/08 , G06F12/16 , H04L12/40 , H04L12/40006 , H04L12/403
摘要： Switch units control ON and OFF of communication between a master device and slave devices. Signal levels of communication lines between switch units and slave devices are maintained at a predetermined level. A switch unit in a first stage is turned on and off by a first switch control signal. A switch unit in a second stage is turned on and off by a switch control signal generated based on a level of a communication line in the first stage and the first switch control signal. A switch unit in each of subsequent stages is turned on and off by a switch control signal generated based on a level of a communication line in a preceding stage and a switch control signal in a second preceding stage. A portion of ground short circuit is identified based on states of communication between the master device and the slave devices.
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10.发明授权Image forming apparatus, density-shift correction method, and computer program product 失效图像形成装置，密度移动校正方法和计算机程序产品公开(公告)号：US08384958B2
公开(公告)日：2013-02-26
申请号：US12585134
申请日：2009-09-04
申请人： Tomohide Kondoh
发明人： Tomohide Kondoh
CPC分类号： H04N1/506 , G03G15/0194 , G03G15/161 , G03G2215/0161
摘要： A density detector detects a first density of a first pattern and a second density of a second pattern from a density-correction determination patch. A density-correction-value calculator calculates a density correction value from the first and the second densities. A noise-occurrence determination unit determines whether a target pixel is a noise generating pixel that causes a change of a local density due to a change in a relation with a nearby pixel. A density correction processor performs a density correction process on the target pixel by adding or subtracting the density correction value to or from the target pixel or the nearby pixel.
摘要翻译： 密度检测器从密度校正确定贴片检测第一图案的第一密度和第二图案的第二密度。 密度校正值计算器从第一和第二密度计算密度校正值。 噪声发生确定单元确定目标像素是否是由于与附近像素的关系的变化而导致局部密度变化的噪声产生像素。 密度校正处理器通过向目标像素或附近像素加上或减去浓度校正值来对目标像素执行浓度校正处理。
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