公开(公告)号：US20130148168A1

公开(公告)日：2013-06-13

申请号：US13313329

申请日：2011-12-07

申请人： Edgar A. Bernal ,  Shen-ge Wang ,  Robert P. Loce ,  Zhigang Fan

发明人： Edgar A. Bernal ,  Shen-ge Wang ,  Robert P. Loce ,  Zhigang Fan

IPC分类号： H04N1/405

CPC分类号： G06T1/0028 ,  G06T2201/0051 ,  H04N1/32256

摘要： As set forth herein, computer-implemented methods and systems facilitate watermarking documents and/or images using 2nd generation stochastic halftoning. The watermark is used to spatially vary the gray level at which a frequency modulation-to-amplitude modulation transition occurs. The encoding algorithm uses as inputs a contone image and a watermark. The visibility of the watermark is controlled by the magnitude of the difference between the AM-to-FM transition threshold values.

摘要翻译： 如本文所述，计算机实现的方法和系统便于使用第二代随机半色调来水印文档和/或图像。 水印用于在空间上改变发生频率调制到幅度调制转换的灰度级。 编码算法使用连字图像和水印作为输入。 水印的可视性由AM到FM转换阈值之间的差值的大小控制。

公开(公告)号：US20120293842A1

公开(公告)日：2012-11-22

申请号：US13108235

申请日：2011-05-16

申请人： Shen-ge Wang ,  Edgar A. Bernal ,  Robert P. Loce ,  Zhigang Fan

发明人： Shen-ge Wang ,  Edgar A. Bernal ,  Robert P. Loce ,  Zhigang Fan

IPC分类号： H04N1/405

CPC分类号： H04N1/4051 ,  H04N1/4092

摘要： As set forth herein, computer-implemented methods and systems facilitate halftoning by adapting 2nd generation halftone techniques to the spatial frequency content of an image utilizing a spot function introduced in conjunction with a technique for determining seed locations, which results in halftone images exhibiting improved edge and detail rendition. A dominant orientation of pixels in an input image is employed to select a pre-generated stochastic screen used to determine the seed locations.

摘要翻译： 如本文所述，计算机实现的方法和系统通过使用结合用于确定种子位置的技术引入的斑点函数使第二代半色调技术适应于图像的空间频率内容来促进半色调，这导致半色调图像表现出改善的边缘 和细节再现。 采用输入图像中的像素的主要取向来选择用于确定种子位置的预先生成的随机屏幕。

公开(公告)号：US08970910B2

公开(公告)日：2015-03-03

申请号：US13313329

申请日：2011-12-07

申请人： Edgar A. Bernal ,  Shen-ge Wang ,  Robert P. Loce ,  Zhigang Fan

发明人： Edgar A. Bernal ,  Shen-ge Wang ,  Robert P. Loce ,  Zhigang Fan

IPC分类号： H04N1/405 ,  G06K15/00

CPC分类号： G06T1/0028 ,  G06T2201/0051 ,  H04N1/32256

摘要： As set forth herein, computer-implemented methods and systems facilitate watermarking documents and/or images using 2nd generation stochastic halftoning. The watermark is used to spatially vary the gray level at which a frequency modulation-to-amplitude modulation transition occurs. The encoding algorithm uses as inputs a contone image and a watermark. The visibility of the watermark is controlled by the magnitude of the difference between the AM-to-FM transition threshold values.

摘要翻译： 如本文所述，计算机实现的方法和系统便于使用第二代随机半色调来水印文档和/或图像。 水印用于在空间上改变发生频率调制到幅度调制转换的灰度级。 编码算法使用连字图像和水印作为输入。 水印的可视性由AM到FM转换阈值之间的差值的大小控制。

公开(公告)号：US08467099B2

公开(公告)日：2013-06-18

申请号：US13108235

申请日：2011-05-16

申请人： Shen-ge Wang ,  Edgar A. Bernal ,  Robert P. Loce ,  Zhigang Fan

发明人： Shen-ge Wang ,  Edgar A. Bernal ,  Robert P. Loce ,  Zhigang Fan

IPC分类号： H04N1/405

CPC分类号： H04N1/4051 ,  H04N1/4092

摘要： As set forth herein, computer-implemented methods and systems facilitate halftoning by adapting 2nd generation halftone techniques to the spatial frequency content of an image utilizing a spot function introduced in conjunction with a technique for determining seed locations, which results in halftone images exhibiting improved edge and detail rendition. A dominant orientation of pixels in an input image is employed to select a pre-generated stochastic screen used to determine the seed locations.

摘要翻译： 如本文所述，计算机实现的方法和系统通过使用结合用于确定种子位置的技术引入的斑点函数使第二代半色调技术适应于图像的空间频率内容来促进半色调，这导致半色调图像表现出改善的边缘 和细节再现。 采用输入图像中的像素的主要取向来选择用于确定种子位置的预先生成的随机屏幕。

公开(公告)号：US20120274985A1

公开(公告)日：2012-11-01

申请号：US13096429

申请日：2011-04-28

申请人： Edgar A. Bernal ,  Shen-ge Wang ,  Robert P. Loce

发明人： Edgar A. Bernal ,  Shen-ge Wang ,  Robert P. Loce

IPC分类号： H04N1/405

CPC分类号： H04N1/4055

摘要： As set forth herein, computer-implemented methods and systems facilitate halftoning using a parametrically controlled spot function based on triangle tessellation, which in turn facilitates dot growth control of periodic halftone using an irregular seed structure. The spot function determines the shape of the halftone dot used to reproduce a given pixel. The spot function is well suited for growing halftone dots arrayed on a non-regular grid and can also be used for grids with regular order. The spot function includes adjustable parameters for controlling its sharpness and slope.

摘要翻译： 如本文所述，计算机实现的方法和系统使用基于三角形镶嵌的参数控制的点函数来促进半色调调整，这进一步促进了使用不规则种子结构的周期性半色调的点生长控制。 点功能决定用于再现给定像素的半色调点的形状。 斑点功能非常适合生长在非规则网格上的半色调点，并且也可以用于具有定期顺序的网格。 点功能包括用于控制其锐度和斜率的可调参数。

公开(公告)号：US20140029073A1

公开(公告)日：2014-01-30

申请号：US13559866

申请日：2012-07-27

申请人： Shen-ge Wang ,  Edgar A. Bernal ,  Robert P. Loce

发明人： Shen-ge Wang ,  Edgar A. Bernal ,  Robert P. Loce

IPC分类号： G03F3/08

CPC分类号： G06T5/005 ,  H04N1/4097

摘要： When restoring a scanned halftone image of a damaged document, parameters of the halftone structure (geometry) are estimated, as is an intended contone gray level for damaged portions of the image. Locations of halftone cell tiles in the scanned image are determined based on the halftone structure, and a halftone profile model is generated using the estimated halftone parameters and contone information. Image segments are aligned using global features for coarse alignment and halftone structure for fine alignment, such as in cases where the scanned halftone image contains unconnected fragments. Missing parts of the damaged document image are filled in using the halftone profile model and estimated contone values.

摘要翻译： 当恢复损坏的文档的扫描半色调图像时，会对该半色调结构（几何）的参数进行估计，对于损坏的图像部分，也是预期的连续色调灰度级。 基于半色调结构确定扫描图像中的半色调单元瓦片的位置，并且使用估计的半色调参数和连续色调信息生成半色调轮廓模型。 图像片段使用用于粗略对齐和半色调结构的全局特征进行对齐，用于精细对齐，例如在扫描的半色调图像包含未连接片段的情况下。 使用半色调配置文件模型和估计的连续色调值填充损坏的文档图像的缺失部分。

公开(公告)号：US08547598B2

公开(公告)日：2013-10-01

申请号：US13096520

申请日：2011-04-28

申请人： Shen-ge Wang ,  Edgar A. Bernal ,  Robert P. Loce

发明人： Shen-ge Wang ,  Edgar A. Bernal ,  Robert P. Loce

IPC分类号： H04N1/405 ,  G06F15/00

CPC分类号： H04N1/4055

摘要： As set forth herein, computer-implemented methods and systems facilitate halftoning using boundaries and centers of a polygonal tiling with a parameterized spot function that operates within the tiles. Defining the halftone structure includes defining the polygonal tiling with a specification of the polygon boundaries and center, and setting and applying parameters of the spot function, which utilizes center-to-boundary distances. The tiling can be defined explicitly, by defining a tile structure, or providing centers, one per polygon, and vertices for the polygons. The vertices and centers are used to generate the polygon boundaries. The polygonal tiling can be regular (e.g., repetitive) or irregular, and can also be varied in a manner adapted to the image content or to data that is being embedded.

摘要翻译： 如本文所述，计算机实现的方法和系统利用在瓦片内操作的参数化点函数的多边形平铺的边界和中心进行半色调。 定义半色调结构包括使用多边形边界和中心的规格定义多边形平铺，以及利用中心到边界距离设置和应用点函数的参数。 可以通过定义瓦片结构或为多边形提供中心，每个多边形和顶点来定义平铺。 顶点和中心用于生成多边形边界。 多边形拼贴可以是规则的（例如，重复的）或不规则的，并且还可以以适于图像内容或嵌入的数据的方式进行变化。

公开(公告)号：US09183619B2

公开(公告)日：2015-11-10

申请号：US13559866

申请日：2012-07-27

申请人： Shen-ge Wang ,  Edgar A. Bernal ,  Robert P. Loce

发明人： Shen-ge Wang ,  Edgar A. Bernal ,  Robert P. Loce

IPC分类号： H04N1/52 ,  G06T5/00 ,  H04N1/409

CPC分类号： G06T5/005 ,  H04N1/4097

摘要： When restoring a scanned halftone image of a damaged document, parameters of the halftone structure (geometry) are estimated, as is an intended contone gray level for damaged portions of the image. Locations of halftone cell tiles in the scanned image are determined based on the halftone structure, and a halftone profile model is generated using the estimated halftone parameters and contone information. Image segments are aligned using global features for coarse alignment and halftone structure for fine alignment, such as in cases where the scanned halftone image contains unconnected fragments. Missing parts of the damaged document image are filled in using the halftone profile model and estimated contone values.

摘要翻译： 当恢复损坏的文档的扫描半色调图像时，会对该半色调结构（几何）的参数进行估计，对于损坏的图像部分，也是预期的连续色调灰度级。 基于半色调结构确定扫描图像中的半色调单元瓦片的位置，并且使用估计的半色调参数和连续色调信息生成半色调轮廓模型。 图像片段使用用于粗略对齐和半色调结构的全局特征进行对齐，用于精细对齐，例如在扫描的半色调图像包含未连接片段的情况下。 使用半色调配置文件模型和估计的连续色调值填充损坏的文档图像的缺失部分。

公开(公告)号：US08681383B2

公开(公告)日：2014-03-25

申请号：US13334482

申请日：2011-12-22

申请人： Shen-ge Wang ,  Edgar A. Bernal ,  Robert P. Loce

发明人： Shen-ge Wang ,  Edgar A. Bernal ,  Robert P. Loce

IPC分类号： H04N1/405

CPC分类号： H04N1/4051 ,  H04N1/52

摘要： As set forth herein, computer-implemented methods and systems facilitate employing a single stochastic screen defined up to a specified transition level. The dots at the specified level are connected to form a triangle tessellation with an associated spot function. For up to three colorants, a vector screening technique is employed, which involves a first colorant dot being grown from the vertices, second colorant dot grown from the triangle center, and a third colorant dot grown from the side midpoints. Growth in this manner ensures separation of colorants up to a certain density level. In cases where fourth colorant is to be used at a given pixel, the fourth colorant can be added using methods typically used for clustered screens, such as stochastic screening of the lightest colorant, in order to mitigate color shift sensitivity issues.

摘要翻译： 如本文所述，计算机实现的方法和系统便于采用在特定过渡级别之下定义的单个随机屏幕。 指定级别的点被连接以形成具有相关联的点功能的三角形细分。 对于最多三种着色剂，使用载体筛选技术，其包括从顶点生长的第一着色剂点，从三角形中心生长的第二着色剂点和从侧面中点生长的第三着色剂点。 以这种方式生长确保着色剂的分离达到一定的密度水平。 在给定像素处使用第四着色剂的情况下，可以使用通常用于聚类屏幕的方法（例如最轻的着色剂的随机筛选）来添加第四着色剂，以减轻色移敏感性问题。

公开(公告)号：US20120274984A1

公开(公告)日：2012-11-01

申请号：US13096520

申请日：2011-04-28

申请人： Shen-ge Wang ,  Edgar A. Bernal ,  Robert P. Loce

发明人： Shen-ge Wang ,  Edgar A. Bernal ,  Robert P. Loce

IPC分类号： H04N1/405

CPC分类号： H04N1/4055

摘要： As set forth herein, computer-implemented methods and systems facilitate halftoning using boundaries and centers of a polygonal tiling with a parameterized spot function that operates within the tiles. Defining the halftone structure includes defining the polygonal tiling with a specification of the polygon boundaries and center, and setting and applying parameters of the spot function, which utilizes center-to-boundary distances. The tiling can be defined explicitly, by defining a tile structure, or providing centers, one per polygon, and vertices for the polygons. The vertices and centers are used to generate the polygon boundaries. The polygonal tiling can be regular (e.g., repetitive) or irregular, and can also be varied in a manner adapted to the image content or to data that is being embedded.

摘要翻译： 如本文所述，计算机实现的方法和系统利用在瓦片内操作的参数化点函数的多边形平铺的边界和中心进行半色调。 定义半色调结构包括使用多边形边界和中心的规格定义多边形平铺，以及利用中心到边界距离设置和应用点函数的参数。 可以通过定义瓦片结构或为多边形提供中心，每个多边形和顶点来定义平铺。 顶点和中心用于生成多边形边界。 多边形拼贴可以是规则的（例如，重复的）或不规则的，并且还可以以适于图像内容或嵌入的数据的方式进行变化。