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1. 发明授权

US06782126B2 Method for combining feature distance with spatial distance for segmentation 失效
标题翻译：将特征距离与空间距离相结合的方法进行分割
公开(公告)号：US06782126B2
公开(公告)日：2004-08-24
申请号：US09785396
申请日：2001-02-20
申请人： Ravishankar Rao , Kuo Chung-Hui , Gerhard R. Thompson
发明人： Ravishankar Rao , Kuo Chung-Hui , Gerhard R. Thompson
IPC分类号： G06K934
CPC分类号： G06K9/342 , G06K9/6224 , G06T7/11 , G06T7/162 , G06T7/90 , G06T2207/10008 , G06T2207/20021 , G06T2207/30176
摘要： A method for the complete segmentation of an image into regions of near-uniform color first segments the image into blocks of size N×M and applies color clustering within these blocks. This is done with a sequential color clustering algorithm. Subsequent to this, the color clusters that are spatially adjacent and also have similar color characteristics are merged. This is done through a novel method which combines distance in the feature space with distance in the spatial domain. This results in spatially compact color regions which have similar color information. The result of applying this technique is a complete segmentation of the image according to regions of near-uniform color.
摘要翻译：将图像完全分割成近均匀颜色的区域的方法首先将图像划分成大小为N×M的块，并在这些块内应用颜色聚类。这是通过顺序颜色聚类算法完成的。在此之后，与空间相邻并且具有相似颜色特征的颜色集合被合并。这是通过将特征空间中的距离与空间域中的距离相结合的新颖方法来完成的。这导致具有相似颜色信息的空间紧凑的颜色区域。应用该技术的结果是根据近均匀颜色的区域对图像进行完全分割。

2. 发明授权

US06721448B2 Color clustering and segmentation using sigma filtering 有权
标题翻译：使用sigma滤波的颜色聚类和分割
公开(公告)号：US06721448B2
公开(公告)日：2004-04-13
申请号：US09785397
申请日：2001-02-20
申请人： Ravishankar Rao , Kuo Chung-Hui , Gerhard R. Thompson
发明人： Ravishankar Rao , Kuo Chung-Hui , Gerhard R. Thompson
IPC分类号： G06K900
CPC分类号： G06T5/20 , G06K9/4652 , G06T5/002 , G06T7/11 , G06T7/143 , G06T2207/10024 , G06T2207/20012 , G06T2207/20021 , G06T2207/20036 , G06T2207/20192 , G06T2207/30176
摘要： A color clustering and segmentation method retains edge. A sigma filter is applied to an input image to generate a smoothed image. The filtered image is divided into a plurality of non-overlapping windows. A sequential clustering algorithm is applied to filtered pixels of each window to generate potential clusters. Generated potential clusters are validated while clusters representing pixels on boundaries are rejected. The result is a generated list of cluster centroids in a chosen color space.
摘要翻译：颜色聚类和分割方法保留边缘。将Σ滤波器应用于输入图像以产生平滑图像。滤波后的图像被分成多个不重叠的窗口。顺序聚类算法被应用于每个窗口的滤波像素以产生潜在的簇。生成的潜在簇被验证，而表示边界上的像素的簇被拒绝。结果是在所选颜色空间中生成的聚类中心列表。

3. 发明授权

US06515770B1 Dither mask generation with calibration-independent number of threshold levels 有权
标题翻译：具有校准无关数阈值电平的抖动掩码生成
公开(公告)号：US06515770B1
公开(公告)日：2003-02-04
申请号：US09270042
申请日：1999-03-16
申请人： Ravishankar Rao , Gerhard R. Thompson , Charles P. Tresser , Chai W. Wu
发明人： Ravishankar Rao , Gerhard R. Thompson , Charles P. Tresser , Chai W. Wu
IPC分类号： G06K1500
CPC分类号： H04N1/4051 , H04N1/4078
摘要： Calibrated dither masks adaptable to most printers are constructed in such a way that the threshold values can be adapted to a printer so that said printer can print the originally intended number of distinct tone levels. This adaptation can be done computationally so that the time it takes is not prohibitive. Furthermore, the resulting calibrated dither mask is such that there is no need for a tone reproduction curve in the halftoning process.
摘要翻译：适用于大多数打印机的校准的抖动掩码被构造成使得阈值可以适应于打印机，使得所述打印机可以打印原始预期数量的不同色调级别。这种适应可以在计算上完成，所以它所需的时间并不太高。此外，所得到的校准抖动掩模使得在半色调处理中不需要色调再现曲线。

4. 发明授权

US06738162B1 Digital printer for avoiding moire patterns by using a dithering mask and angular rotation between print head and print medium to simulate analog printer halftoning of color images 失效
标题翻译：数字打印机，通过使用抖动面罩和打印头和打印介质之间的角度旋转来避免莫尔图案，以模拟彩色图像的模拟打印机半色调
公开(公告)号：US06738162B1
公开(公告)日：2004-05-18
申请号：US09457325
申请日：1999-12-09
申请人： Marco Martens , Ravishankar Rao , Gerhard R. Thompson , Charles B. Tresser , Chai W. Wu
发明人： Marco Martens , Ravishankar Rao , Gerhard R. Thompson , Charles B. Tresser , Chai W. Wu
IPC分类号： B05C1706
CPC分类号： B41J25/003 , B41J19/16 , H04N1/52
摘要： A semi-digital printer includes a print head assembly that prints an image on a sheet of paper that has been mounted onto a turntable, and a rotating means which rotates the turntable so that the print head assembly ejects ink or toner onto the sheet of paper at one or more predetermined angles. The printing may be halftone or color. If the print head assembly includes more than one print head, the rotating means rotates the turntable to a different angle for each print head. By rotating the turntable in this manner, the printer records an image at any angle (0° to 360°) precisely (i.e., without having to perform the angular approximations required by conventional digital printers). As a result, a printed image of improved quality is produced. Alternatively, the semi-digital printer may be configured so that the print head assembly rotates relative to the paper.
摘要翻译：半数字打印机包括打印头组件，其将已经安装在转台上的纸张上的图像打印出来;以及旋转装置，其使转盘旋转，使得打印头组件将油墨或调色剂喷射到纸张上在一个或多个预定角度。打印可能是半色调或彩色。如果打印头组件包括多于一个的打印头，旋转装置将转盘旋转到与每个打印头不同的角度。通过以这种方式旋转转盘，打印机以任何角度（0°至360°）精确地记录图像（即，不必执行常规数字打印机所需的角度近似）。结果，产生了改进质量的打印图像。或者，半数字打印机可以被配置为使得打印头组件相对于纸张旋转。

5. 发明授权

US06947178B2 De-screening halftones using sigma filters 失效
标题翻译：使用sigma过滤器去筛选半色调
公开(公告)号：US06947178B2
公开(公告)日：2005-09-20
申请号：US09791653
申请日：2001-02-26
申请人： Chungkui Kuo , Ravishankar Rao , Gerhard R. Thompson
发明人： Chungkui Kuo , Ravishankar Rao , Gerhard R. Thompson
IPC分类号： G06T5/20 , G06T5/00 , H04N1/40 , H04N1/409 , H04N1/405
CPC分类号： G06T5/002 , G06T5/20 , G06T2207/10008 , G06T2207/10024 , G06T2207/20192 , G06T2207/30176 , H04N1/40075
摘要： A digital imaging system and method uses a two-stage sigma filter to de-screen color images. This filter does not assume any a priori knowledge about the screening process using to produce the halftone image. The two-stage sigma filter may therefore be used to convert color halftone images into continuous-tone images irrespective of the screening process used. The two-stage sigma filter may be constructed, or emulated in software, using an O (N) algorithm which performs smoothing and preserves edge information simultaneously in the Red/Green/Blue color space. This system and method outperforms conventional approaches which, for example, use a Gaussian blur, because it satisfies the dual criteria of completely eliminating halftone screens while preserving edge information. When combined with halftone segmentation techniques, a complete document processing algorithm for gray-scale and color documents is created.
摘要翻译：数字成像系统和方法使用两级Σ滤波器去除彩色图像。该过滤器不承担任何关于用于产生半色调图像的筛选过程的先验知识。因此，两级西格玛滤波器可以用于将彩色半色调图像转换为连续色调图像，而与所使用的筛选过程无关。可以使用O（N）算法在软件中构建或仿真两级Σ滤波器，该算法在红/绿/蓝色空间中同时进行平滑处理并保留边缘信息。该系统和方法胜过例如使用高斯模糊的常规方法，因为它满足完全消除半色调屏幕同时保留边缘信息的双重标准。当与半色调分割技术相结合时，创建了用于灰度和彩色文档的完整文档处理算法。

6. 发明授权

US06714318B1 Dithering method and apparatus for multitone printers 有权
标题翻译：多色打印机的抖动方法和装置
公开(公告)号：US06714318B1
公开(公告)日：2004-03-30
申请号：US09412645
申请日：1999-10-05
申请人： Charles H. Morris, III , Joan L. Mitchell , Chai W. Wu , Gerhard R. Thompson , Charles P. Tresser , Nenad Rijavec
发明人： Charles H. Morris, III , Joan L. Mitchell , Chai W. Wu , Gerhard R. Thompson , Charles P. Tresser , Nenad Rijavec
IPC分类号： H04N140
CPC分类号： H04N1/40087
摘要： Digital halftoning techniques in printers which construct and utilize a mask in a dithering algorithm for a multitone printer are generalized by using a decision matrix in conjunction with a dithering matrix. For each pixel in the image, pixel grey value and a mask threshold value are obtained. Based on these values, a decision is made on the grey level to be printed at each pixel. For extensions to multiple component color images, each component is treated independently as if it were a grey scale image. The mask threshold values and sizes are likely to be tuned per component and therefore different.
摘要翻译：通过使用结合抖动矩阵的决策矩阵来推广在多音频打印机的抖动算法中构造和利用掩码的打印机中的数字半色调技术。对于图像中的每个像素，获得像素灰度值和掩码阈值。基于这些值，对要在每个像素上打印的灰度级进行判定。对于多组分彩色图像的扩展，每个组件被独立地处理，就像它是灰度图像一样。掩模阈值和尺寸可能会被调整到每个组件，因此不同。

7. 发明授权

US06597813B1 Masks with modulated clustering and aperiodicity and rescaling of masks 有权
标题翻译：具有调制聚类和非周期性和面罩重新缩放的面具
公开(公告)号：US06597813B1
公开(公告)日：2003-07-22
申请号：US09265861
申请日：1999-03-11
申请人： Mikel J. Stanich , Gerhard R. Thompson , Charles P. Tresser , Chai W. Wu
发明人： Mikel J. Stanich , Gerhard R. Thompson , Charles P. Tresser , Chai W. Wu
IPC分类号： G06K936
CPC分类号： H04N1/4051
摘要： A technique combines most of the advantages of both blue noise and clustering in generating a partially clustered aperiodic mask and using it in a dither array algorithm for halftoning, such that the amount of clustering can be modulated. A method to create an enlarged partially clustered aperiodic dither mask, appearing as a modulated version of a periodic enlargement of original mask, is used when the original mask generates patterns that are not visually pleasing or the original mask doesn't generate enough distinct grey levels. The method of halftoning of grey scale images utilizes a pixel-by-pixel comparison of the image against a partially clustered aperiodic mask in which the clustered aperiodic mask is comprised of a partly random and partly deterministic single valued function which is designed to produce visually pleasing dot configurations when thresholded at any level of grey. A method for changing a number of distinct grey levels a mask can produce to be used in halftoning of grey scale images produces advantages for some printing devices.
摘要翻译：一种技术将蓝噪声和聚类的大部分优点结合在生成部分聚集的非周期性掩模中，并将其用于用于半色调的抖动阵列算法中，使得可以调制聚类量。当原始掩模产生不令人满意的图案或者原始掩模不产生足够的不同灰度级时，使用一种形成放大的部分聚集的非周期性抖动掩模的方法，作为原始掩模的周期性放大的调制版本。灰度图像的半色调的方法利用图像与部分聚集的非周期掩模的逐像素比较，其中聚集的非周期性掩模由部分随机和部分确定性的单值函数组成，其被设计为产生视觉上令人满意的在任何灰度级别进行阈值处理时的点配置。用于改变掩模可以产生用于灰度图像的半色调的不同灰度级数的方法为一些打印设备产生了优势。

8. 发明授权

US07616347B2 System and method for multi-bit halftoning 失效
标题翻译：多位半色调的系统和方法
公开(公告)号：US07616347B2
公开(公告)日：2009-11-10
申请号：US11117426
申请日：2005-04-29
申请人： Hong Li , Mikel John Stanich , Gerhard R. Thompson , Chai Wah Wu
发明人： Hong Li , Mikel John Stanich , Gerhard R. Thompson , Chai Wah Wu
IPC分类号： H04N1/405
CPC分类号： H04N1/40087
摘要： A method (and system) of multi-bit halftoning includes comparing values of an image to threshold values of a halftone threshold matrix, and generating output values that provide a greater than minimum level of contrast.
摘要翻译：多比特半色调的方法（和系统）包括将图像的值与半色调阈值矩阵的阈值进行比较，以及生成提供大于最小对比度的输出值。

9. 发明授权

US07489419B2 Method and system for specifying halftone spot shapes 有权
标题翻译：用于指定半色调斑点形状的方法和系统
公开(公告)号：US07489419B2
公开(公告)日：2009-02-10
申请号：US10868047
申请日：2004-06-15
申请人： Huy A. Nguyen , Mikel J. Stanich , Gerhard R. Thompson , Chai W. Wu
发明人： Huy A. Nguyen , Mikel J. Stanich , Gerhard R. Thompson , Chai W. Wu
IPC分类号： H04N1/40
CPC分类号： H04N1/4055
摘要： A halftone spot function, for determining a shape of a halftone spot as a function of the intensity of an image being printed, is generated by creating one or two line segments forming a part of the shape of the spot function or by creating a number of contour lines that are interpolated to form the function. A halftone spot pattern is generated as a number of supercells, each of which includes a number of halftone spots, each defined within a halftone spot cell by a halftone spot function, with the supercell being defined to include a number of device pixels, each of which is fully inked of left without ink, a number of spot cells in each direction, and offset distance establishing angles of the lines dividing the spot cells from one another.
摘要翻译：通过产生形成点功能的形状的一部分的一个或两个线段或者通过创建一些数量的网点来产生用于确定作为被打印的图像的强度的函数的半色调点的形状的半色调点功能内插的轮廓线形成功能。产生半色调点图案作为多个超单元，每个超单元包括多个半色调点，每个半色调点通过半色调点功能在半色调点单元内定义，超单元被定义为包括多个设备像素，每个其中没有油墨的是完全墨水，在每个方向上的多个光点单元以及将光点彼此分开的线的偏移距离建立角度。

10. 发明授权

US07333244B2 Method and system for embedding an image into two other images 有权
标题翻译：将图像嵌入其他图像的方法和系统
公开(公告)号：US07333244B2
公开(公告)日：2008-02-19
申请号：US10758536
申请日：2004-01-16
申请人： Mikel J. Stanich , Gerhard R. Thompson , Chai Wah Wu
发明人： Mikel J. Stanich , Gerhard R. Thompson , Chai Wah Wu
IPC分类号： G06K15/00
CPC分类号： G06T1/0021 , G06T2201/0051 , H04N1/32144 , H04N1/32256 , H04N1/405 , H04N1/6058
摘要： A method of embedding an image into two images by performing a digital halftoning process on a Cartesian product of color spaces to embed the image into the two images. A digital halftoning process includes an iterative isotropic halftoning process. The iterative isotropic halftoning process for each iteration if Outimage has not changed between two iterations or maximum number of iterations reached, then exit the iterations loop.
摘要翻译：通过对颜色空间的笛卡尔乘积执行数字半色调处理以将图像嵌入到两个图像中，将图像嵌入到两个图像中的方法。数字半色调处理包括迭代各向同性半色调处理。如果Outimage在两次迭代或最大迭代次数之间没有改变，则每次迭代的迭代各向同性半色调处理，然后退出迭代循环。

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