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21. 发明授权

US08098406B2 Image forming apparatus capable of suppressing color variation due to misregistration of colors, image forming method, and computer-readable medium 有权
标题翻译：能够抑制由于颜色不对齐引起的颜色变化的图像形成装置，图像形成方法和计算机可读介质
公开(公告)号：US08098406B2
公开(公告)日：2012-01-17
申请号：US12071042
申请日：2008-02-14
申请人： Soh Hirota , Osamu Yamada , Toshio Tsuboi
发明人： Soh Hirota , Osamu Yamada , Toshio Tsuboi
IPC分类号： H04N1/405
CPC分类号： H04N1/52
摘要： An image forming apparatus performs dither processing on image data to form an image subjected to pseudo-halftone processing. The image forming apparatus includes a dither processing unit that performs dither processing on image data, and a dither pattern generation unit that generates a dither matrix for use in the dither processing, in accordance with an output gradation level. The dither matrix has a size of M×N pixels, and has a plurality of halftone dots arranged in a predetermined pattern in accordance with the output gradation level in order to represent a gradation of each color. The plurality of halftone dots are arranged in the dither matrix such that the halftone dots corresponding to at least two colors are substantially identical in color area ratio to each other in the dither matrix irrespective of a relative position with respective to the colors.
摘要翻译：图像形成装置对图像数据进行抖动处理以形成经受假半色调处理的图像。图像形成装置包括对图像数据进行抖动处理的抖动处理单元和根据输出灰度级产生用于抖动处理的抖动矩阵的抖动图案生成单元。抖动矩阵具有M×N个像素的尺寸，并且具有根据输出灰度等级以预定图案排列的多个半色调点，以便表示每种颜色的灰度。多个半色调点被布置在抖动矩阵中，使得对应于至少两种颜色的半色调点在抖动矩阵中的颜色面积比基本上相同，而与相对于颜色的相对位置无关。

22. 发明申请

US20090091796A1 Image forming apparatus capable of suppressing color variation due to misregistration of colors, image forming method, and computer-readable medium 有权
标题翻译：能够抑制由于颜色不对齐引起的颜色变化的图像形成装置，图像形成方法和计算机可读介质
公开(公告)号：US20090091796A1
公开(公告)日：2009-04-09
申请号：US12071042
申请日：2008-02-14
申请人： Soh Hirota , Osamu Yamada , Toshio Tsuboi
发明人： Soh Hirota , Osamu Yamada , Toshio Tsuboi
IPC分类号： G06K15/00
CPC分类号： H04N1/52
摘要： An image forming apparatus performs dither processing on image data to form an image subjected to pseudo-halftone processing. The image forming apparatus includes a dither processing unit that performs dither processing on image data, and a dither pattern generation unit that generates a dither matrix for use in the dither processing, in accordance with an output gradation level. The dither matrix has a size of M×N pixels, and has a plurality of halftone dots arranged in a predetermined pattern in accordance with the output gradation level in order to represent a gradation of each color. The plurality of halftone dots are arranged in the dither matrix such that the halftone dots corresponding to at least two colors are substantially identical in color area ratio to each other in the dither matrix irrespective of a relative position with respective to the colors.
摘要翻译：图像形成装置对图像数据进行抖动处理以形成经受假半色调处理的图像。图像形成装置包括对图像数据进行抖动处理的抖动处理单元和根据输出灰度级产生用于抖动处理的抖动矩阵的抖动图案生成单元。抖动矩阵具有M×N像素的大小，并且具有根据输出灰度级以预定图案排列的多个半色调点，以便表示每种颜色的灰度。多个半色调点被布置在抖动矩阵中，使得对应于至少两种颜色的半色调点在抖动矩阵中的颜色面积比基本上相同，而与相对于颜色的相对位置无关。

23. 发明授权

US06501566B1 Image processing apparatus carrying out multi-value error diffusion process 失效
标题翻译：图像处理装置进行多值误差扩散处理
公开(公告)号：US06501566B1
公开(公告)日：2002-12-31
申请号：US09050905
申请日：1998-03-31
申请人： Kazuhiro Ishiguro , Kaoru Tada , Soh Hirota
发明人： Kazuhiro Ishiguro , Kaoru Tada , Soh Hirota
IPC分类号： H04N140
CPC分类号： H04N1/40087
摘要： An image processing apparatus that can carry out an error diffusion process without degrading the quality of image data generates a density histogram according to pixels included in the input image data. Reference densities S1 and S2 are calculated from pixels having a certain density in a set range. Threshold values T1-T3 are calculated according to the obtained reference densities S1 and S2.
摘要翻译：可以在不降低图像数据的质量的情况下进行误差扩散处理的图像处理装置根据输入图像数据中包含的像素生成密度直方图。参考密度S1和S2由在一定范围内具有一定密度的像素计算。根据获得的参考密度S1和S2计算阈值T1-T3。

24. 发明授权

US06433896B1 Image processing apparatus 失效
标题翻译：图像处理装置
公开(公告)号：US06433896B1
公开(公告)日：2002-08-13
申请号：US09095311
申请日：1998-06-10
申请人： Kazuhiro Ueda , Nobuhiro Mishima , Soh Hirota , Daisetsu Tohyama
发明人： Kazuhiro Ueda , Nobuhiro Mishima , Soh Hirota , Daisetsu Tohyama
IPC分类号： H04N104
CPC分类号： H04N1/00384 , G06K9/32 , H04N1/00411 , H04N1/00681 , H04N1/00702 , H04N1/0071 , H04N1/00713 , H04N1/00718 , H04N1/00737 , H04N1/00748 , H04N1/00753 , H04N1/00816 , H04N1/3878
摘要： In an image processing apparatus, an image reading unit reads a document put on a platen glass to generate image data, and a detector in the image reading unit detects offset, tilt angle and document area of the document put on the platen glass. A rotation angle is set based on the image data of a document. The entire document area is determined based on a portion of the document which exists within the image reading area when the document extends beyond the image reading area. The document area can be detected even if a document is not rectangular. For example, a slope of the document is determined based on the detected longest segment. In order to solve the unequal reading pitch, the longest segment is selected in the segments having a slope smaller than a predetermined angle relative to the subscan direction. Then, the image data are corrected according to the above result.
摘要翻译：在图像处理装置中，图像读取单元读取放置在台板玻璃上的文档以生成图像数据，并且图像读取单元中的检测器检测放置在稿台玻璃上的文档的偏移，倾斜角度和原稿区域。基于文档的图像数据设置旋转角度。当文档延伸超出图像读取区域时，基于存在于图像读取区域内的文档的一部分来确定整个文档区域。即使文档不是矩形，也可以检测文档区域。例如，基于检测到的最长段来确定文档的斜率。为了解决不等的读取间距，在相对于副扫描方向具有小于预定角度的斜率的段中选择最长的段。然后，根据上述结果校正图像数据。

25. 发明授权

US06560351B1 Image reading apparatus capable of detecting glossiness of image surface 失效
标题翻译：能够检测图像表面光泽度的图像读取装置
公开(公告)号：US06560351B1
公开(公告)日：2003-05-06
申请号：US09354108
申请日：1999-07-15
申请人： Soh Hirota
发明人： Soh Hirota
IPC分类号： G06K900
CPC分类号： H04N1/40062 , G01N21/57 , G01N2021/8416 , G06T7/41 , G06T2207/10008 , H04N1/0035 , H04N1/00384 , H04N1/00413 , H04N1/1017 , H04N1/193
摘要： In an image reading apparatus, an overall control portion can detect the glossiness of the image surface of an original using a sensor unit in producing image data. The user can set a condition to form an image in an operation panel. Overall control portion does not detect the glossiness of the image surface of an original with sensor unit in producing image data when a prescribed condition is set in operation panel.
摘要翻译：在图像读取装置中，总体控制部分可以使用传感器单元在产生图像数据时检测原稿的图像表面的光泽度。用户可以在操作面板中设置条件以形成图像。当在操作面板中设定规定条件时，总体控制部分在传感器单元产生图像数据时，不检测原稿的图像表面的光泽度。

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