公开(公告)号：US20040156077A1

公开(公告)日：2004-08-12

申请号：US10734315

申请日：2003-12-12

发明人： Toshiaki Kakutani

IPC分类号： H04N001/405

CPC分类号： H04N1/4052

摘要： The present invention relates to an image processing technique for improving dot dispersion in highlight areas and shadow areas in an error diffusion method. The image processing device of the invention has a plurality of types of error diffusion matrices with different diffusion ranges, and selects a matrix depending on the error that has occurred, which is then used to diffuse the error into peripheral pixels. Of the plurality of error diffusion matrices, the matrix having the widest diffusion range is a matrix that diffuses error with bias in the raster direction (specifically, a matrix having a directivity factor of 2.0 or higher). If a matrix that diffuses error uniformly were employed where error must be diffused over a wide range, as in a highlight area or shadow area, error diffused into individual pixels is small that, in some instances, dots are formed in proximity to one another; however, where error diffusion is carried out while switching among matrices that include this kind of high directivity matrix, formation of dots in proximity to one another can be avoided.

摘要翻译： 本发明涉及一种用于在误差扩散方法中改善高光区域和阴影区域中的点散射的图像处理技术。 本发明的图像处理装置具有多种类型的具有不同扩散范围的误差扩散矩阵，并且根据所发生的误差选择矩阵，然后将该误差扩散到周边像素中。 在多个误差扩散矩阵中，具有最宽扩散范围的矩阵是在光栅方向（具体地，方向性因子为2.0或更高的矩阵）上扩散误差的矩阵。 如果使用扩散误差均匀的矩阵，其中误差必须在宽范围内扩散，如在高亮区域或阴影区域中，扩散到各个像素中的误差小，在某些情况下，点形成在彼此附近; 然而，当在包括这种高方向性矩阵的矩阵之间切换时进行误差扩散，可以避免彼此接近的点的形成。

公开(公告)号：US20040141189A1

公开(公告)日：2004-07-22

申请号：US10248450

申请日：2003-01-21

申请人： INTERNATIONAL BUSINESS MACHINES CORPORATION

发明人： DANIELLE K. DITTRICH ,  LARRY M. ERNST

IPC分类号： H04N001/405 ,  H04N001/409

CPC分类号： H04N1/40068 ,  H04N1/405

摘要： An image processing method and apparatus for enhancing the quality of a printed image without degrading overall printer performance or throughput by simulating 2 bit pel printing on a bi-level printer using intelligent double dotting. The present invention allows a bi-level printer to print an 2N dpi 1 bit-per-pel image through intelligent double dotting, thus enhancing the half resolution rendered image to approach the print quality as if the image were rendered at full resolution. In one embodiment, an enhanced resolution mode which uses a bi-level printer's 1200 dpi mode to print 600 dpi, 2 bit-per-pel images, results in an image having higher resolution quality than rendering the image using traditional halftone methods at either 600 dpi or 1200 dpi. Image enhancement through higher order resolution multiplication is also disclosed.

摘要翻译： 一种图像处理方法和装置，用于通过使用智能双点模拟在双层打印机上模拟2位像素打印，来提高打印图像的质量而不降低整体打印机性能或吞吐量。 本发明允许双电平打印机通过智能双点打印2N dpi 1比特像素图像，从而增强半分辨率渲染图像以接近打印质量，好像图像以全分辨率呈现。 在一个实施例中，使用双电平打印机的1200dpi模式来打印600dpi，每像素2像素图像的增强分辨率模式导致具有比用600的传统半色调方法渲染图像更高的分辨率质量的图像 dpi或1200 dpi。 还公开了通过更高阶分辨率乘法的图像增强。

公开(公告)号：US20040114187A1

公开(公告)日：2004-06-17

申请号：US10715437

申请日：2003-11-19

申请人： DAINIPPON SCREEN MFG. CO., LTD.

发明人： Itaru Furukawa

IPC分类号： H04N001/405

CPC分类号： H04N1/40075

摘要： A method of performing a descreening process with high accuracy by separating a first region from which a gradation area is to be derived and a second region from which a monotone area is to be derived from each other in a screened image with high accuracy is provided. Halftone dot positions and halftone cells are specified at an output resolution level based on the angle dependence of a distribution obtained by counting recorder grids constituting each halftone dot in one direction. By extracting edges of halftone dots and counting them in one direction, the position of deformed halftone dots positioned on a boundary between first regions having different gradation levels is detected at the output resolution level, whereby the position of picture-originated pixels is specified with high accuracy. Based on a positional relationship between inconsistent recorder grids caused when bringing the picture-originated pixels and SPM data into correspondence with each other which is derived from the result of the specification of the position of the picture-originated pixels, a preset separation mask is corrected with high accuracy at a recorder grid level. The use of the separation mask achieves high-accuracy separation between the first and second regions. Consequently, more precise correspondence between the picture-originated pixels and the SPM data improves the accuracy of the descreening process.

摘要翻译： 提供了一种以高精度通过分离要从其导出灰度区域的第一区域和要从其中导出单调区域的第二区域以高精度执行去网过程的方法。 基于通过对在一个方向上构成每个半色调点的记录器网格进行计数获得的分布的角度依赖性，以输出分辨率级别来指定半色调点位置和半色调单元。 通过提取半色调点的边缘并在一个方向上对它们进行计数，在输出分辨率级别处检测位于具有不同灰度级的第一区域之间的边界上的变形半色调点的位置，由此以高的像素指定图像起始像素的位置 准确性。 基于从图像发生像素的位置的指定结果导出的使源自图像的像素和SPM数据彼此对应的不一致的记录器栅格之间的位置关系，校正预设的分离掩模 在记录器网格级别具有高精度。 使用分离掩模实现了第一和第二区域之间的高精度分离。 因此，图像起始像素和SPM数据之间的更精确的对应性提高了去网过程的准确性。

公开(公告)号：US20040114186A1

公开(公告)日：2004-06-17

申请号：US10321968

申请日：2002-12-17

申请人： Xerox Corporation

发明人： Zhigang Fan

IPC分类号： H04N001/405 ,  G06K009/56

CPC分类号： H04N1/40062 ,  H04N1/405

摘要： A method for selecting a halftoning mode to be applied to regions within an image. The method operates on received image data to identify low-level regions within the received image data. The low-level regions are defined and separated by edges. Pixels that are not separated by edges are considered to belong to the same region. After the regions have been identified, low-level image attributes for the image data within each region are compiled. A halftoning method suited for the image data within the region can be selected based upon low-level image attributes.

摘要翻译： 一种用于选择要应用于图像内的区域的半色调模式的方法。 该方法对接收到的图像数据进行操作以识别接收到的图像数据内的低级区域。 低级区域由边界定义和分隔。 不被边缘分隔的像素被认为属于同一区域。 在区域被识别之后，编译每个区域内的图像数据的低级图像属性。 可以基于低级图像属性来选择适合于该区域内的图像数据的半色调方法。

公开(公告)号：US20040114160A1

公开(公告)日：2004-06-17

申请号：US10319054

申请日：2002-12-12

申请人： Xerox Corporation

发明人： Shen-Ge Wang ,  Beilei Xu ,  Chu-Heng Liu

IPC分类号： H04N001/405 ,  H04N001/50 ,  G03G021/04

CPC分类号： H04N1/00883 ,  G03G21/043 ,  H04N1/405

摘要： The present invention relates to the manipulation of differential gloss as may be inherent in halftoned images by utilization of tags. By selectively applying halftones with anisotropic structure characteristics, which are significantly different in orientation while remaining identical in density, as directed by tag settings, a gloss image may be superimposed within an image without the need for special toners or paper. Conventional copier systems will not typically be able to copy such a superimposed gloss image.

摘要翻译： 本发明涉及通过利用标签对半色调图像固有的差异光泽的操作。 通过选择性地应用具有各向异性结构特征的半色调，其在取向上显着不同，同时保持密度相同，如标签设置所指示的，光泽图像可以叠加在图像内，而不需要特殊的调色剂或纸张。 传统的复印机系统通常不能复制这种叠加的光泽图像。

公开(公告)号：US20040109204A1

公开(公告)日：2004-06-10

申请号：US10725397

申请日：2003-12-03

申请人： CANON KABUSHIKI KAISHA

发明人： Masao Kato ,  Akitoshi Yamada ,  Mitsuhiro Ono

IPC分类号： H04N001/52 ,  H04N001/405

CPC分类号： H04N1/4057 ,  H04N1/52

摘要： An image processing apparatus executes an error diffusion process to multivalue image data consisting of a plurality of density components. A first processor executes the error diffusion process by changing at least one of a quantization threshold value and a quantization diffusion coefficient which are used for the error diffusion process based on a value of the multivalue image data of the density components or a value calculated from the multivalue image data value. A second processor executes the error diffusion process by setting the quantization threshold value and the quantization diffusion coefficient which are used for the error diffusion process into fixed values. An error diffusion processing controller controls to execute the error diffusion process to at least one color among the density components by the first processor and execute the error diffusion process to other density components by the second processor.

摘要翻译： 图像处理装置执行误差扩散处理以多值化由多个密度分量组成的图像数据。 第一处理器通过根据密度分量的多值图像数据的值或由该值计算的值改变用于误差扩散处理的量化阈值和量化扩散系数中的至少一个来执行误差扩散处理 多值图像数据值。 第二处理器通过将用于误差扩散处理的量化阈值和量化扩散系数设置为固定值来执行误差扩散处理。 误差扩散处理控制器控制由第一处理器对密度分量中的至少一种颜色执行误差扩散处理，并且通过第二处理器对其它浓度分量执行误差扩散处理。

公开(公告)号：US20040095606A1

公开(公告)日：2004-05-20

申请号：US10713080

申请日：2003-11-17

申请人： Silverbrook Research Pty Ltd.

发明人： Simon Robert Walmsley ,  Paul Lapstun

IPC分类号： G06K015/02 ,  H04N001/405 ,  H04N001/52 ,  H04N001/64 ,  H04N001/413 ,  H04N001/387 ,  H04N001/50 ,  H04N001/21 ,  G06T001/20

CPC分类号： G06F3/1208 ,  G06F3/1213 ,  G06F3/1277 ,  G06F3/1282

摘要： A printer with a multi-segment printhead has multiple engine/controllers (10) configured to be coupled with other engine/controllers to drive the printhead (33). The controllers each have an interface (27) at which to receive compressed page data. Image decoders (28, 88) decode compressed image planes image decoders to perform an expansion, in pipeline fashion, for the received compressed page data. A half-toner/compositer (29) composites respective strips of the decoded image planes and sends output to a printhead interface (32). A printhead interface (32) interfaces with the printhead. A synchronization signal generator (89,90) may output a synchronization signal that is used to synchronize print engine/controllers. One printhead interface (32) preferably acts as master generating the synchronization signal to synchronize all the print engine/controllers to drive the printhead at any one or more of higher speed, higher input resolution, higher outlet resolution or wider format. The half-toner/compositor (29) scales input image planes under control of a margin unit (57) set the print engine/controller to establish print data for a strip only of the image, the image being built from the respective strips from the multiple print engine/controllers.

摘要翻译： 具有多段打印头的打印机具有多个引擎/控制器（10），其被配置为与其它引擎/控制器耦合以驱动打印头（33）。 控制器各具有接收压缩页面数据的接口（27）。 图像解码器（28,88）解码压缩图像平面图像解码器，以流水线方式对接收到的压缩页面数据进行扩展。 半色调/合成器（29）复合各个解码图像平面的条，并将输出发送到打印头接口（32）。 打印头接口（32）与打印头接口。 同步信号发生器（89,90）可以输出用于同步打印引擎/控制器的同步信号。 优选地，一个打印头接口（32）充当主产生同步信号以同步所有打印引擎/控制器以以更高速度，更高输入分辨率，更高出口分辨率或更宽格式的任何一个或多个来驱动打印头。 半色调/合成器（29）在边缘单元（57）的控制下缩放输入图像平面，设置打印引擎/控制器以建立仅用于图像的条带的打印数据，该图像是从相应的条带 多个打印引擎/控制器。

公开(公告)号：US20040090654A1

公开(公告)日：2004-05-13

申请号：US10662460

申请日：2003-09-15

发明人： Luc Minnebo ,  Koen Vande Velde ,  Paul Delabastita

IPC分类号： H04N001/405 ,  H04N001/52

CPC分类号： H04N1/4053 ,  H04N1/52

摘要： In an error diffusion halftoning process a clusters of adjacent pixels can be placed at any arbitrary position of the pixel grid. The quantization step of the error diffusion takes into account the effect of placement of a cluster of pixels. The size of a pixel cluster may be fixed or variable. The quantization step of the halftoning process may take into account the effect of the placement of a cluster of pixels in the same or in a different color separation. The method produces halftones that are less grainy and that print more robustly and uniformly in the presence of printer variability. The quantization step in the error diffusion process according to one representative embodiment of the invention evaluates quantization values of possible alternatives in placing the clusters of pixels.

摘要翻译： 在误差扩散半色调处理中，相邻像素的簇可以被放置在像素网格的任意位置。 误差扩散的量化步骤考虑了一组像素的放置效应。 像素簇的大小可以是固定的或可变的。 半色调处理的量化步骤可以考虑到相同或不同颜色分离中的像素簇的放置的影响。 该方法产生较少颗粒状的半色调，并且在存在打印机变化性的情况下更均匀地印刷。 根据本发明的一个代表性实施例的误差扩散处理中的量化步骤在放置像素簇时评估可能的替代方案的量化值。

公开(公告)号：US20040085586A1

公开(公告)日：2004-05-06

申请号：US10284955

申请日：2002-10-31

发明人： Guotong Feng ,  Michael George Fuchs ,  Charles A. Bouman

IPC分类号： H04N001/405

CPC分类号： H04N1/4053 ,  B41J2/205 ,  B41J2/52

摘要： A device to translate an input pixel value to an output pixel value for a current pixel includes a diffusion block to produce a diffusion error to add to the input pixel value to produce a diffused pixel value. In addition, the device includes a feedback modulation block to generate a threshold value, the threshold value determined using a value of an earlier output pixel value, the earlier output pixel value occurring at a predetermined number of pixels prior to the current pixel. Furthermore, the device includes a quantizer to compare the diffused pixel value to the threshold value and based on the comparison to select a value for the output pixel value.

摘要翻译： 将输入像素值转换为当前像素的输出像素值的装置包括扩散块，以产生扩散误差以添加到输入像素值以产生漫射像素值。 另外，该装置包括用于产生阈值的反馈调制块，使用较早输出像素值的值确定的阈值，在当前像素之前的预定数量的像素处出现的较早输出像素值。 此外，该装置包括量化器，用于将扩散像素值与阈值进行比较，并且基于比较来选择输出像素值的值。

公开(公告)号：US20040061903A1

公开(公告)日：2004-04-01

申请号：US10616454

申请日：2003-07-09

发明人： Toru Fujita

IPC分类号： H04N001/405 ,  G06K015/00

CPC分类号： G06K15/1223 ,  H04N1/4057 ,  H04N1/4058

摘要： A printer is capable of expressing halftones by forming halftone spots in cells each having a plurality of pixels by irradiating an exposure beam. The printer comprises a halftone processing section for converting M-bit image data into N (M>N)-bit drive pulse width data for driving the exposure beam. The halftone processing section includes a threshold matrix including a plurality of threshold values corresponding to the plurality of pixels, and a converter circuit which compares a plurality of threshold values output from the threshold matrix with image data, and generates drive pulse width data in accordance with the comparison result. Random noise is superposed on the plurality of threshold values or the image data, and the resultant is subjected to the comparison, whereby generation of tone jump is suppressed. The halftone processing section further includes pulse position determining means for determining a position of a drive pulse for a pixel under processing in accordance with drive pulse width data of pixels adjacent to the pixel under processing, and a pulse width modulator for generating a drive pulse signal at the determined drive pulse position according to the drive pulse width data.

摘要翻译： 打印机能够通过照射曝光光束在每个具有多个像素的单元中形成半色调斑点来表现半色调。 该打印机包括一个半色调处理部分，用于将M位图像数据转换为用于驱动曝光光束的N（M> N）位驱动脉冲宽度数据。 所述半色调处理部分包括包括与所述多个像素相对应的多个阈值的阈值矩阵，以及转换器电路，其将从所述阈值矩阵输出的多个阈值与图像数据进行比较，并根据所述转换器电路生成驱动脉冲宽度数据 比较结果。 随机噪声叠加在多个阈值或图像数据上，并且对结果进行比较，从而抑制色调跳跃的产生。 半色调处理部分还包括脉冲位置确定装置，用于根据与处理中的像素相邻的像素的驱动脉冲宽度数据确定处理中的像素的驱动脉冲的位置;以及脉冲宽度调制器，用于产生驱动脉冲信号 在确定的驱动脉冲位置根据驱动脉冲宽度数据。