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公开(公告)号：US4891710A
公开(公告)日：1990-01-02
申请号：US136486
申请日：1987-12-21
IPC分类号： H04N1/405
CPC分类号： H04N1/4052 , H04N1/4053
摘要： An image signal processing circuit for converting step-gradation density values (I.sub.xy) of successive picture elements to bi-level values (P.sub.xy) for display by a bi-level display device, in which a bi-level error (E.sub.xy) between a bi-level value determined for a picture element and an appropriate density value for the element is apportioned among a set of peripherally adjacent picture elements (A to D) by computing a corresponding set of error apportionment values (G.sub.A to G.sub.D), and in which a difference between the sum total of these apportionment values and the bi-level error is derived, and error apportionment is modified such as to eliminate the effects of this difference. Improved reproduction is thereby attained of image regions which are of uniformly high density or low density.
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公开(公告)号：US4890167A
公开(公告)日：1989-12-26
申请号：US110082
申请日：1987-10-16
CPC分类号： G09G3/2059 , H04N1/4052 , G09G2310/0286 , G09G3/28
摘要： An image signal processing circuit for converting a continuous tone image signal to a bi-level image signal, for producing a spatial gray scale image on a bi-level display device such as a gas plasma display panel. Respective values of apportionment factors (K.sub.A to K.sub.D) used for apportioning a bi-level conversion error of each picture element of the image among a plurality of picuture elements (A to D) positioned peripehrally adjacent thereto are periodically altered, in a periodic or random succession of values, to thereby effectively eliminate the generation of a texture pattern in display regions corresponding to areas of uniform density in the original image.
摘要翻译： 一种用于将连续色调图像信号转换为双电平图像信号的图像信号处理电路，用于在诸如气体等离子体显示面板的双电平显示装置上产生空间灰度图像。 用于分配在与其周边定位的多个图形元素（A至D）中的图像的每个像素的双电平转换误差的分配因子（KA至KD）的值周期性地或周期性地改变 从而有效地消除了对应于原始图像中均匀密度区域的显示区域中的纹理图案的产生。
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公开(公告)号：US4924322A
公开(公告)日：1990-05-08
申请号：US324780
申请日：1989-03-17
CPC分类号： H04N1/4053
摘要： An image signal processing apparatus for converting input signal values representing density levels of successive picture elements of an image to corresponding bi-level signal values, whereby a conversion error for an object picture element is apportioned among a set of unprocessed adjacent picture elements, to update respective values of accumulated error. Each input signal value is compensated, prior to conversion, by a value derived from the total accumulated errors of the object picture element and these adjacent picture elements, while the conversion error is derived by subtracting from the bi-level output value a value obtained by compensating the input signal by the accumulated error for the object picture element.
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公开(公告)号：US4692811A
公开(公告)日：1987-09-08
申请号：US758961
申请日：1985-07-25
CPC分类号： H04N1/4052
摘要： The invention relates to a method for processing an image signal such that areas of original image data are sequentially scanned with a scanning window having a size corresponding to M picture elements in units of a predetermined number of picture elements so as to perform halftone display in accordance with black-and-white binary distribution with respect to the signal levels of the picture elements within the scanning window every time the scanning window is moved. The picture elements within the scanning window are assigned an order of preference in accordance with their image signal levels. A sum of the image signal levels of the picture elements within the scanning window is calculated, and A and N of the equations S=C.times.N+A are calculated, where C is a predetermined image signal level (e.g., black level and maximum level), N is an integer, and A is the image signal level falling within the range O.ltoreq.A
摘要翻译： 本发明涉及一种用于处理图像信号的方法，使得以预定数量的图像元素为单位的具有与M个图像元素相对应的尺寸的扫描窗口顺序地扫描原始图像数据的区域，以便按照该方式执行半色调显示 每次扫描窗口移动时，相对于扫描窗口内的图像元素的信号电平，具有黑白二进制分布。 扫描窗口内的图像元素根据其图像信号电平被分配优先顺序。 计算扫描窗口内的像素的图像信号电平的和，并计算等式S = CxN + A的A和N，其中C是预定的图像信号电平（例如，黑电平和最大电平） ，N是整数，A是图像信号电平落在范围O <= A
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公开(公告)号：US4538184A
公开(公告)日：1985-08-27
申请号：US501873
申请日：1983-06-07
申请人： Hirotaka Otsuka , Katsuo Nakazato , Kunio Sannomiya , Hidehiko Kawakami , Hiroyoshi Tsuchiya , Hideo Uchida
发明人： Hirotaka Otsuka , Katsuo Nakazato , Kunio Sannomiya , Hidehiko Kawakami , Hiroyoshi Tsuchiya , Hideo Uchida
CPC分类号： H04N1/4055 , H04N1/40075
摘要： A method for processing a video signal comprises defining a successively shifted scan window with respect to the signal level of each picture element from which said video signal has been derived, totalizing the quantum numbers of the picture elements in the scan window corresponding to the original screen dot, and reconstructing black picture elements corresponding to the total value of the quantum numbers faithfully to the area of the original dot, and an apparatus for carrying out the method.
摘要翻译： 一种用于处理视频信号的方法包括相对于已经从其导出所述视频信号的每个图像元素的信号电平来定义连续移动的扫描窗口，对与原始屏幕相对应的扫描窗口中的图像元素的量子数进行合计 点，并且将与量子数字的总值对应的黑色图像元素忠实地重构到原始点的区域，以及用于执行该方法的装置。
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公开(公告)号：US4551768A
公开(公告)日：1985-11-05
申请号：US545926
申请日：1983-10-27
CPC分类号： H04N1/4051
摘要： The invention relates to a method for processing an image signal such that areas of original image data are sequentially scanned with a scanning window having a size corresponding to M picture elements in units of a predetermined number of picture elements so as to perform halftone display in accordance with black-and-white binary distribution with respect to the signal levels of the picture elements within the scanning window every time the scanning window is moved. The picture elements within the scanning window are assigned an order of preference in accordance with their image signal levels. A sum of the image signal levels of the picture elements within the scanning window is calculated, and A and N of the equation S=C.times.N+A are calculated, where C is a predetermined image signal level (e.g., black level and maximum level), N is an integer, and A is the image signal level falling within the range 0.ltoreq.A
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公开(公告)号：US5134272A
公开(公告)日：1992-07-28
申请号：US379123
申请日：1989-07-13
申请人： Hiroyoshi Tsuchiya , Atsuharu Yamamoto , Kunio Sannomiya , Hiroaki Kotera , Katsuo Nakazato , Mikio Fujita , Shigeo Komizo
发明人： Hiroyoshi Tsuchiya , Atsuharu Yamamoto , Kunio Sannomiya , Hiroaki Kotera , Katsuo Nakazato , Mikio Fujita , Shigeo Komizo
IPC分类号： G06K7/10
CPC分类号： G06K7/10871 , G06K7/1093 , G06K7/1443 , G06K7/1456
摘要： An apparatus for receiving input data values representing an array of picture elements of a source image containing one or more bar code regions, whereby the input data values are converted to bi-level values representing black or white states which are stored in an image memory, while in addition the bi-level values are processed to obtain data representing an image in which a "skeleton" central portion of the bar code region appears as an all-black region, while background black regions are eliminated. A central position and the slope of a central axis of the bar code region are computed based on that "skeleton" region, and data values in the image memory which conform to the central axis are then read out, to read the bar code data.
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公开(公告)号：US4586089A
公开(公告)日：1986-04-29
申请号：US523952
申请日：1983-08-17
申请人： Katsuo Nakazato , Kunio Sannomiya , Hidehiko Kawakami , Hiroyoshi Tsuchiya , Hiroyoshi Otsuka , Hideo Uchida
发明人： Katsuo Nakazato , Kunio Sannomiya , Hidehiko Kawakami , Hiroyoshi Tsuchiya , Hiroyoshi Otsuka , Hideo Uchida
CPC分类号： H04N1/00734 , H04N1/00681 , H04N1/00748 , H04N1/00761 , H04N1/00782 , H04N1/3935 , H04N1/4072 , H04N1/4092
摘要： An image processor for reproducing a continuous tone image such as a photograph in a black-and-white binary dot image (halftone image) has a linear correction section for converting a sampled digital image signal in a predetermined manner controlled by black and white densities of an original, thereby performing linear conversion between the continuous tone image and the halftone image. The image processor also has another correction section for performing profile emphasis to obtain a clear halftone image.
摘要翻译： 用于再现黑白二进制点图像（半色调图像）中的诸如照片的连续色调图像的图像处理器具有用于以由黑白密度控制的预定方式转换采样数字图像信号的线性校正部分 从而在连续色调图像和半色调图像之间进行线性转换。 图像处理器还具有用于执行配置文件强调以获得清晰的半色调图像的另一校正部分。
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公开(公告)号：US4502081A
公开(公告)日：1985-02-26
申请号：US428235
申请日：1982-09-29
申请人： Hirotaka Otsuka , Hideo Uchida , Yoshihiro Uno , Katsuo Nakazato , Kunio Sannomiya , Hidehiko Kawakami , Hiroyoshi Tsuchiya
发明人： Hirotaka Otsuka , Hideo Uchida , Yoshihiro Uno , Katsuo Nakazato , Kunio Sannomiya , Hidehiko Kawakami , Hiroyoshi Tsuchiya
IPC分类号： H04N1/40
CPC分类号： H04N1/40068
摘要： In a variable density scanner a light beam of a fixed spot size is scanned on an original along each of a plurality of parallel line paths at a constant speed to generate a video signal and successively shifted to the next line path. The video signal is sampled to generate a video sample. Each of the line paths is divided into a plurality of line segments so that each segment derives a plurality of video samples and the line paths are formed into a plurality of groups of adjacent line paths so that the video samples are derived from a plurality of patterns of rows and columns. The total value of the video samples of each pattern is arithmetically divided by their number in response to the control signal to derive an average value.
摘要翻译： 在可变密度扫描仪中，固定光斑尺寸的光束以恒定速度沿着多条平行线路径中的每条平行线路沿着原稿扫描，以产生视频信号，并连续地移动到下一条线路。 视频信号被采样以产生视频样本。 每个线路径被分成多个线段，使得每个段导出多个视频样本，并且线路径形成为多组相邻线路径，使得视频样本从多个模式导出 的行和列。 每个图案的视频样本的总值根据控制信号以数量除以其数量以得到平均值。
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10.发明授权Method and apparatus for converting a line density of a bi-level image signal 失效用于转换双向图像信号的线密度的方法和装置
公开(公告)号：US5229868A
公开(公告)日：1993-07-20
申请号：US571350
申请日：1990-08-23
申请人： Yoshimitsu Kanno , Toshiharu Kurosawa , Hidehiko Kawakami , Hiroaki Kotera , Hiroyoshi Tsuchiya , Hideaki Ohira , Mutuo Hashizume
发明人： Yoshimitsu Kanno , Toshiharu Kurosawa , Hidehiko Kawakami , Hiroaki Kotera , Hiroyoshi Tsuchiya , Hideaki Ohira , Mutuo Hashizume
IPC分类号： H04N1/40
CPC分类号： H04N1/40075 , H04N1/40068
摘要： A correspondence relation between a structure of a bi-level pattern A and a structure of a bi-level pattern B is statistically learned by use of a learning high-density image. The bi-level pattern A forms a partial region of a low-density character and line image except a screened dot image. The bi-level pattern B forms a corresponding partial region of a desired high-density image. A judgement is made as to whether the low-density image is equal to or different from a screened dot image. Reference pixels are selected from the partial region of the low-density image. The low-density bi-level pattern A is converted into the high-density bi-level pattern B on the basis of a result of the learning by use of the selected reference pixels when the low-density image is different from a screened dot image. A pixel of the low-density image is repeated to convert the low-density image into the high-density image when the low-density image is equal to a screend dot image.
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