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11. 发明授权

US07365882B2 Halftone screen frequency and magnitude estimation for digital descreening of documents 有权
标题翻译：半色调屏幕频率和幅度估计用于文件的数字去网
公开(公告)号：US07365882B2
公开(公告)日：2008-04-29
申请号：US10776612
申请日：2004-02-12
申请人： Donald J. Curry , Asghar Nafarieh , Doron Kletter
发明人： Donald J. Curry , Asghar Nafarieh , Doron Kletter
IPC分类号： H04N1/405
CPC分类号： H04N1/40075
摘要： A highly efficient method and system for eliminating halftone screens from scanned documents while preserving the quality and sharpness of text and line-art is disclosed. The method and system utilizes a single channel screen frequency estimator module, which generates a screen frequency estimate for image data. The module generates a signal based on the highly filtered image signal at low contrast levels, and based on a reliable estimate to the halftone frequency at higher contrast levels. The single channel screen estimate module has adequate performance in resolution ranges from 300 to 600 dpi.
摘要翻译：公开了一种用于从扫描文档中消除半色调屏幕的高效方法和系统，同时保持文本和线条的质量和清晰度。该方法和系统利用单通道屏幕频率估计模块，其生成图像数据的屏幕频率估计。该模块基于低对比度下的高度滤波的图像信号产生信号，并且基于对较高对比度下的半色调频率的可靠估计。单通道屏幕估算模块在300至600 dpi的分辨率范围内具有足够的性能。

12. 发明授权

US07356183B2 Segmentation method and system for multiple raster content (MRC) representation of documents 有权
标题翻译：用于多个光栅内容（MRC）表示文档的分割方法和系统
公开(公告)号：US07356183B2
公开(公告)日：2008-04-08
申请号：US10612248
申请日：2003-07-01
申请人： Donald J. Curry , Doron Kletter , Asghar Nafarieh
发明人： Donald J. Curry , Doron Kletter , Asghar Nafarieh
IPC分类号： G06K9/34 , G06K9/36
CPC分类号： G06K9/00456 , H04N1/40062
摘要： A method and a system for separating an image signal into a set of image planes in accordance with a control signal. The system comprises a selector module, an edge processing module and a foreground/background separation module. The selector module receives the control signal and produces a selector signal. The edge processing module receives the selector signal and produces a decision signal. The foreground/background separation module receives the image signal and the decision signal, and outputs a foreground signal and a background signal, a representation of the current pixel of the image signal being included in at least one of the foreground signal and the background.
摘要翻译：根据控制信号将图像信号分离为一组图像平面的方法和系统。该系统包括选择器模块，边缘处理模块和前景/背景分离模块。选择器模块接收控制信号并产生选择信号。边缘处理模块接收选择器信号并产生判定信号。前景/背景分离模块接收图像信号和判定信号，并输出前景信号和背景信号，图像信号的当前像素的表示被包括在前景信号和背景中的至少一个中。

13. 发明授权

US07236641B2 Page background detection and neutrality on scanned documents 有权
标题翻译：扫描文档上的页面背景检测和中立性
公开(公告)号：US07236641B2
公开(公告)日：2007-06-26
申请号：US10612234
申请日：2003-07-01
申请人： Donald J. Curry , Doron Kletter , Asghar Nafarieh
发明人： Donald J. Curry , Doron Kletter , Asghar Nafarieh
IPC分类号： G06K9/40 , G06K9/34 , G06K9/00
CPC分类号： H04N1/56 , G06T5/001 , G06T2207/10008 , G06T2207/10024 , G06T2207/20008 , G06T2207/30176
摘要： A Statistics Module (STS) is disclosed for collecting essential statistics about an image content for the purpose of applying various image enhancement operations such as page background removal and automatic neutral detection to determine if the page is gray or colored. The Statistics Module uses the blurred signal BLR from a De-Screen Module in order to eliminate some of the scanner noise. The output is a special 3D color histogram array.
摘要翻译：公开了统计模块（STS），用于收集关于图像内容的基本统计数据，以便应用各种图像增强操作，例如页面背景去除和自动中性线检测，以确定页面是灰色还是彩色。统计模块使用去屏模块的模糊信号BLR，以消除一些扫描仪噪声。输出是一个特殊的3D颜色直方图数组。

14. 发明授权

US06175650B1 Adaptive quantization compatible with the JPEG baseline sequential mode 失效
标题翻译：与JPEG基线顺序模式兼容的自适应量化
公开(公告)号：US06175650B1
公开(公告)日：2001-01-16
申请号：US09013480
申请日：1998-01-26
申请人： Pradeep S. Sindhu , Jean-Marc Frailong , Donald J. Curry , Asghar Nafarieh , Doron Kletter
发明人： Pradeep S. Sindhu , Jean-Marc Frailong , Donald J. Curry , Asghar Nafarieh , Doron Kletter
IPC分类号： G06K900
CPC分类号： G06T9/005
摘要： Pixel blocks of an input image are type classified based on an analysis of the secord differences between the values of neighboring pixels in the rows and columns of each pixel block. A histogram of these second order differences may be employed to refine this analysis
摘要翻译：基于对每个像素块的行和列中的相邻像素的值之间的秒差的分析，输入图像的像素块是类型分类的。可以使用这些二阶差分的直方图来改进该分析

15. 发明授权

US07532363B2 Apparatus and methods for de-screening scanned documents 失效
标题翻译：扫描文件的扫描装置和方法
公开(公告)号：US07532363B2
公开(公告)日：2009-05-12
申请号：US10776508
申请日：2004-02-12
申请人： Donald J. Curry , Asghar Nafarieh , Doron Kletter
发明人： Donald J. Curry , Asghar Nafarieh , Doron Kletter
IPC分类号： G06K15/00 , H04N1/405
CPC分类号： H04N1/40075 , G06T5/003 , H04N1/4092
摘要： Apparatus and methods for de-screening an image signal utilizing a bank of filters to provide several increasingly blurred versions of the original image signal is disclosed. At any given time, one or more of the blurred versions are created, on a pixel-by-pixel basis. The outputs from a selected pair of blurred signals are then blended together to create a variable blending output that can vary smoothly from no blurring to maximum blurring in a smooth and continuous manner. In addition, the apparatus and methods provide enhanced text and line art by using a variable un-sharp masking mechanism with independent post-blur sharpening control, and detect and enhance neutral (no-color) output pixels.
摘要翻译：公开了一种使用一组滤波器去除屏幕图像信号以提供原始图像信号的几个日益模糊的版本的设备和方法。在任何给定的时间，一个或多个模糊版本是逐个像素地创建的。然后将所选择的一对模糊信号的输出混合在一起，以创建可以以平滑和连续的方式从无模糊到最大模糊的平滑变化的可变混合输出。此外，该装置和方法通过使用具有独立的模糊后锐化控制的可变的非锐利掩蔽机制来提供增强的文本和线条艺术，并且检测和增强中性（无彩色）输出像素。

16. 发明授权

US07386166B2 Systems and methods for connecting regions image data having similar characteristics 有权
标题翻译：用于连接区域具有相似特征的图像数据的系统和方法
公开(公告)号：US07386166B2
公开(公告)日：2008-06-10
申请号：US10776608
申请日：2004-02-12
申请人： Donald J. Curry , Asghar Nafarieh , Doron Kletter , Todd W Thayer
发明人： Donald J. Curry , Asghar Nafarieh , Doron Kletter , Todd W Thayer
IPC分类号： G06K9/00
CPC分类号： G06K9/50 , G06T7/11 , G06T7/194 , G06T2207/10008 , G06T2207/30176 , H04N1/56
摘要： Image data is analyzed line by line to identify pixels having similar color and edge characteristics. The pixels on one line are linked to pixels on another line, if they share similar characteristics. The linked pixels are then grouped together in regions and the average color of the region is calculated. An image map is generated that identifies the regions to which the pixels belong, along with a final table of the regions appearing in the image.
摘要翻译：逐行分析图像数据以识别具有相似颜色和边缘特征的像素。如果一条线上的像素具有相似的特征，那么一条线上的像素将链接到另一条线上的像素。然后将链接的像素组合在一起，并计算该区域的平均颜色。生成图像映射，其识别像素所属的区域，以及出现在图像中的区域的最终表格。

17. 发明授权

US07366357B2 Systems and methods for adjusting image data to form highly compressible image planes 有权
标题翻译：用于调整图像数据以形成高度可压缩的图像平面的系统和方法
公开(公告)号：US07366357B2
公开(公告)日：2008-04-29
申请号：US10776603
申请日：2004-02-12
申请人： Donald J. Curry , Asghar Nafarieh , Doron Kletter
发明人： Donald J. Curry , Asghar Nafarieh , Doron Kletter
IPC分类号： G06K9/36 , G06K9/34 , G06K9/46 , G06K9/00
CPC分类号： H04N1/642
摘要： The image data is processed into a background plane and a plurality of foreground planes. Holes are inserted onto the background plane, in regions which are assigned to a foreground plane. The background plane is sub-sampled, and holes remaining in the sub-sampled image are filled with the average color of the non-zero sub-sampled pixels over pre-determined blocks such as JPEG blocks. If a block is entirely made of holes, the block is filled with a constant color that is propagated from the average color of a previous block. The resulting background plane is far smoother than the original image data and thus can be effectively sub-sampled and highly compressed without adverse deterioration in reconstructed image quality.
摘要翻译：图像数据被处理成背景平面和多个前景平面。在分配给前景平面的区域中，将孔插入到背景平面上。对背景平面进行二次采样，并且通过诸如JPEG块之类的预定块的非零子采样像素的平均颜色填充剩余在子采样图像中的孔。如果一个块完全由孔组成，则该块被填充有一个恒定的颜色，该颜色从先前块的平均颜色传播。所得到的背景平面比原始图像数据更平滑，因此可以有效地进行子采样和高度压缩，而不会造成重建图像质量的恶化。

18. 发明授权

US07343046B2 Systems and methods for organizing image data into regions 有权
标题翻译：将图像数据组织到区域的系统和方法
公开(公告)号：US07343046B2
公开(公告)日：2008-03-11
申请号：US10776602
申请日：2004-02-12
申请人： Donald J. Curry , Asghar Nafarieh , Doron Kletter
发明人： Donald J. Curry , Asghar Nafarieh , Doron Kletter
IPC分类号： G06K9/00 , G06K9/34 , G06K9/62 , G06K9/46 , G06K9/54
CPC分类号： H04N1/56 , G06K9/00456 , G06T7/11 , G06T7/90 , G06T2207/10008 , G06T2207/10024 , G06T2207/20016 , G06T2207/20021 , G06T2207/30176
摘要： The image data is initially processed in a manner that is similar to that used to convert the image data into 3-layer mixed raster content format. After the image data is initially processed through a first stage of the three-layer segmentation process, rather than completing the segmentation into foreground and background planes, the image data is analyzed to identify regions having similar image characteristics. These regions are grouped together in cluster if they share color characteristics and are spatially close. The clusters are then sorted according to their size, and placed into a binary foreground plane based on one or more color characteristics. Each cluster gathered into a binary foreground plane having the same color as the color of the cluster.
摘要翻译：图像数据最初以与用于将图像数据转换为3层混合光栅内容格式的方式类似的方式进行处理。在通过三层分割处理的第一阶段最初处理图像数据之后，不是将分割完成到前景和背景平面，而是分析图像数据以识别具有相似图像特征的区域。如果它们共享颜色特征并且在空间上接近，则这些区域被分组在一起。然后根据它们的大小对簇进行排序，并且基于一个或多个颜色特征将簇放入二进制前景平面。每个群聚集成具有与群集颜色相同颜色的二进制前景平面。

19. 发明授权

US07340090B2 Additive model for efficient representation of digital documents 失效
标题翻译：数字文件有效表示的附加模型
公开(公告)号：US07340090B2
公开(公告)日：2008-03-04
申请号：US10946846
申请日：2004-09-22
申请人： Doron Kletter , Donald James Curry
发明人： Doron Kletter , Donald James Curry
IPC分类号： G06K9/00
CPC分类号： G06T9/001
摘要： Image representation is performed by dividing a source image into foreground, background and selector planes. The foreground plane is selected to contain mainly line type art or textual type information, the background plane mainly contains image data, and the selector plane identifies whether the image data is maintained in either a specific plane or a combination of planes. A color is selected, by averaging or selecting an appropriate value based on overflow or other criteria, to replace each color in the foreground plane. Error in portions of the foreground plane resulting from replacing foreground colors is fed into corresponding portions of the background plane. Each plane is then compressed using compression schemes appropriate for the type of data maintained in each plane (LZW for the foreground, and JPEG for the background and lossless fax LLITT, for example). Image reconstruction is performed by decompressing each of the foreground and background planes, and selecting pixels from each of the foreground plane and an additive image produced by combining image data from both the foreground, background, and selector planes. The selection is made based on the selector plane (selection mask), which identifies where image data is maintained for the reconstructed image (i.e., the upper plane or a combination of planes).
摘要翻译：通过将源图像划分为前景，背景和选择器平面来执行图像表示。前景平面被选择为主要包括线型艺术或文字类型信息，背景平面主要包含图像数据，并且选择器平面识别图像数据是保持在特定平面还是平面的组合中。通过平均或基于溢出或其他标准选择适当的值来选择颜色来替换前景平面中的每种颜色。将由前景颜色替换得到的前景平面的部分中的错误馈送到背景平面的相应部分。然后使用适合于维持在每个平面中的数据类型（例如，前景为LZW，背景为JPEG和无损传真LLITT）的压缩方案来压缩每个平面。通过解压缩前景和背景平面中的每一个以及从前景平面中的每一个选择像素和通过组合来自前景，背景和选择面的图像数据产生的附加图像来执行图像重建。基于选择器平面（选择掩模）进行选择，该选择器平面识别重建图像（即，上平面或平面组合）保持图像数据的位置。

20. 发明授权

US07031518B2 Segmentation method and system for Multiple Raster Content (MRC) representation of documents 失效
标题翻译：文档的多光栅内容（MRC）表示的分段方法和系统
公开(公告)号：US07031518B2
公开(公告)日：2006-04-18
申请号：US10188249
申请日：2002-07-01
申请人： Donald J. Curry , Doron Kletter , Asghar Nafarieh
发明人： Donald J. Curry , Doron Kletter , Asghar Nafarieh
IPC分类号： G06K9/34
CPC分类号： G06K9/38 , G06K9/00456 , G06K2209/01 , G06T7/11 , G06T7/194 , G06T2207/10008 , G06T2207/20012 , G06T2207/30176
摘要： A method and a system for separating an image signal into a set of image planes. The system comprises a min-max module, a dynamic threshold module and a separation module. The min-max module receives the image signal, searches for a minimum and maximum within at least one window centered on a current pixel in the image signal. The dynamic threshold module computes, for the window, based on the respective minimum and maximum received from the min-max module and the current pixel, a respective indicator representing the distance and direction of the current pixel relative to a respective threshold plane, and outputs a control signal based on the indicator. The separation module separates the image signal into the set of image planes in accordance with the control signal by including a representation of the current pixel in at least one of the image planes.
摘要翻译：一种用于将图像信号分离成一组图像平面的方法和系统。该系统包括最小 - 最大模块，动态阈值模块和分离模块。最小 - 最大模块接收图像信号，在以图像信号中的当前像素为中心的至少一个窗口内搜索最小和最大值。动态阈值模块基于从最小 - 最大模块和当前像素接收的相应最小值和最大值来计算窗口，表示当前像素相对于相应阈值平面的距离和方向的相应指示符，并且输出基于指示器的控制信号。分离模块通过在至少一个图像平面中包括当前像素的表示，根据控制信号将图像信号分离成图像平面。

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