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51. 发明授权

US06973213B2 Background-based image segmentation 有权
标题翻译：基于背景的图像分割
公开(公告)号：US06973213B2
公开(公告)日：2005-12-06
申请号：US09977186
申请日：2001-10-12
申请人： Zhigang Fan , Hui Cheng
发明人： Zhigang Fan , Hui Cheng
IPC分类号： G06T11/60 , G06T5/00 , G06T7/40 , H04N1/387 , G06K9/34
CPC分类号： G06K9/00463 , G06K9/00456 , G06T7/11 , G06T7/155 , G06T7/187 , G06T2207/10008 , G06T2207/20156 , G06T2207/30176
摘要： A method for segmenting an image using a background-based segmentation process is provided. A document image (102) is low-pass filtered and decimated. The decimated image is processed at low resolution by a low-resolution segmentation (104) stage. Segmentation results include identification of a main background and one or more objects. Objects that cannot be classified in text or picture classes are further segmented into a local background and smaller objects. This process is reiterated until all objects are classified in text or picture classes. The results are overlaid on the image (102) during an original-resolution refinement (106) stage to refine the segmentation.
摘要翻译：提供了一种使用基于背景的分割过程来分割图像的方法。文档图像（102）被低通滤波和抽取。抽取的图像通过低分辨率分割（104）阶段以低分辨率处理。分割结果包括识别主背景和一个或多个对象。不能分类为文本或图片类的对象进一步分割为本地背景和较小对象。重复此过程，直到所有对象分类为文本或图片类。在原始分辨率细化（106）阶段期间，将结果覆盖在图像（102）上，以细化分割。

52. 发明授权

US06870640B1 Method and apparatus for rendering a continuous tone image representation with multiple digital halftoning 失效
标题翻译：用于呈现具有多次数字半色调的连续色调图像表示的方法和装置
公开(公告)号：US06870640B1
公开(公告)日：2005-03-22
申请号：US09713940
申请日：2000-11-16
申请人： Zhigang Fan , Shen-Ge Wang
发明人： Zhigang Fan , Shen-Ge Wang
IPC分类号： G06K15/02 , H04N1/405 , G06K15/00 , G06K9/36
CPC分类号： H04N1/4052 , G06K15/02
摘要： A system for rendering an image representation is disclosed. The system includes a halftone processor; a printer interfaced to the halftone processor; and a software routine operative on the halftone processor for a) classifying an input pixel value in either a first classification or a second classification, b) determining an output pixel value by error diffusing the input pixel value when the input pixel value is classified in the first classification, c) determining a temporary output pixel value by stochastic screening the input pixel value when the input pixel value is classified in the second classification, d) determining an adjusted input pixel value based on the input pixel value, the temporary output pixel value and a weighting value, e) determining the output pixel value by error diffusing the adjusted input pixel value, and f) rendering the output pixel value in the printer.
摘要翻译：公开了一种渲染图像表示的系统。该系统包括一个半色调处理器; 连接到半色调处理器的打印机; 以及在所述半色调处理器上操作的软件例程，用于a）对第一分类或第二分类中的输入像素值进行分类，b）当所述输入像素值分类为所述输入像素值时，通过误差扩散所述输入像素值来确定输出像素值第一分类，c）当输入像素值分类为第二分类时，通过随机筛选输入像素值来确定临时输出像素值，d）基于输入像素值确定经调整的输入像素值，临时输出像素值和加权值，e）通过误差扩散调整的输入像素值来确定输出像素值，以及f）在打印机中呈现输出像素值。

53. 发明授权

US06766053B2 Method and apparatus for classifying images and/or image regions based on texture information 失效
标题翻译：基于纹理信息对图像和/或图像区域进行分类的方法和装置
公开(公告)号：US06766053B2
公开(公告)日：2004-07-20
申请号：US09737513
申请日：2000-12-15
申请人： Zhigang Fan , Thyagarajan Balasubramanian
发明人： Zhigang Fan , Thyagarajan Balasubramanian
IPC分类号： G06K900
CPC分类号： G06K9/00456 , G06T7/44
摘要： A document processing system and a method for classifying an input image or region thereof as either a synthetic graphic or a natural picture, is disclosed. The system includes an image input subsystem, a processing subsystem for processing image data provided by the image input subsystem, and software/firmware means operative on the processing subsystem for a) low-pass filtering image data representative of the input image or region thereof to produce low-pass filtered pixel values; b) determining a smoothness value for each of a plurality of low-pass filtered pixel values; c) generating histogram data from the smoothness values; d) determining a texture metric for the input image or region thereof from a subset of the histogram data; and e) thresholding the texture metric to classify the input image as either a synthetic graphic or a natural picture.
摘要翻译：公开了将输入图像或其区域分类为合成图形或自然图像的文档处理系统和方法。该系统包括图像输入子系统，用于处理由图像输入子系统提供的图像数据的处理子系统，以及在处理子系统上操作的软件/固件装置，用于a）表示输入图像或其区域的低通滤波图像数据产生低通滤波像素值; b）确定多个低通滤波像素值中的每一个的平滑度值; c）从平滑度值生成直方图数据; d）从直方图数据的子集确定输入图像或其区域的纹理度量; 以及e）阈值纹理度量以将输入图像分类为合成图形或自然图像。

54. 发明授权

US06580820B1 Digital imaging method and apparatus for detection of document security marks 失效
标题翻译：用于检测文档安全标记的数字成像方法和装置
公开(公告)号：US06580820B1
公开(公告)日：2003-06-17
申请号：US09328481
申请日：1999-06-09
申请人： Zhigang Fan
发明人： Zhigang Fan
IPC分类号： G06K900
CPC分类号： H04N1/00846 , H04N1/00875
摘要： A method and apparatus for preventing or inhibiting effective reproduction of documents such as currency, checks, stock certificates, and any other printed document including a pre-defined security mark printed therein. The subject method and apparatus operate to effect a multi-step review of all digital image data acquired from a printed document to be reproduced for purposes of locating any potential security marks and further examining same for purposes of positively identifying a potential security mark as an actual security mark. If a mark is located and verified to be an authentic security mark, effective reproduction of the printed document will not be permitted and/or other security measures will be taken.
摘要翻译：一种用于防止或禁止有效再现诸如货币，支票，股票证书以及其中印有预定义的安全标记的任何其他印刷文件的方法和装置。本发明的方法和装置用于对从要印刷的文件获取的所有数字图像数据进行多步检查，以便找出任何潜在的安全标记，并进一步检查它们，以便将潜在的安全标记确定为实际的安全标记。如果商标位于并被证实为真实的安全标志，则不允许有效复印打印文件和/或采取其他安全措施。

55. 发明授权

US06470168B1 ACD using an added low resolution CCD to prevent even partial printout 失效
标题翻译： ACD使用附加的低分辨率CCD来防止甚至部分打印输出
公开(公告)号：US06470168B1
公开(公告)日：2002-10-22
申请号：US09790467
申请日：2001-02-22
申请人： William A. Fuss , Zhigang Fan
发明人： William A. Fuss , Zhigang Fan
IPC分类号： G03G2100
CPC分类号： H04N1/00843 , G07D7/20 , H04N1/00864 , H04N1/00875
摘要： An anticounterfeit detector (ACD) does both a high and low resolution scan of a document. The video signal resulting from the low resolution scan is used to detect a selected type of image, e.g., currency, negotiable securities, etc., by using ACD hardware or software. A corrective action is taken, e.g., preferably even partial printing from the high resolution scan is prevented, the video signal is invalidated, etc., if the selected image is detected. The low resolution signal can also be obtained by decimating or low pass filtering the high resolution signal.
摘要翻译：防伪检测器（ACD）对文档进行高分辨率和低分辨率扫描。由低分辨率扫描产生的视频信号用于通过使用ACD硬件或软件来检测选定类型的图像，例如货币，可转让证券等。采取纠正措施，例如，如果检测到所选择的图像，则优选地从高分辨率扫描中均匀地进行部分打印，视频信号无效等。也可以通过对高分辨率信号进行抽取或低通滤波来获得低分辨率信号。

56. 发明授权

US06181813B2 Method for counterfeit currency detection using orthogonal line comparison 失效
标题翻译：使用正交线比较的伪币检测方法
公开(公告)号：US06181813B2
公开(公告)日：2001-01-30
申请号：US08940413
申请日：1997-09-29
申请人： Zhigang Fan , John W. Wu , Felice A. Micco , Mike C. Chen , Kien A. Phong
发明人： Zhigang Fan , John W. Wu , Felice A. Micco , Mike C. Chen , Kien A. Phong
IPC分类号： G06K900
CPC分类号： G06K9/3216 , G06K9/42
摘要： An anti-counterfeit currency detection method is disclosed wherein local edge information is utilized for accurately detecting lines and curves of legitimate notes. The method can more accurately determine the location and orientation of a pattern and thus provides more reliable currency detection. A detector is trained off-line with example notes resulting in a stored template generated by recording a test pattern similar to a pattern to be tested; anchor lines are identified within said template which are further represented in subsequent test patterns. The template is rotated and shifted before matching it to the test pattern so that anchor lines align with long lines detected within the test pattern. The template and test pattern are then compared to determine whether there is a match. The system comprises a microprocessor is programmed to facilitate the training of a detector off-line with example notes which are scanned into said system wherein a template is generated by recording an image pattern of said example notes similar to a test pattern to be detected. The microprocessor identifies anchor lines within the template which are further represented in said test pattern; rotates and shifts the template before matching it to the test pattern so that anchor lines align with lines which may be detected within said test pattern; and compares the template to the test pattern to determine whether said anchor lines exist within said test pattern.
摘要翻译：公开了一种防伪货币检测方法，其中使用局部边缘信息来精确检测合法票据的线和曲线。该方法可以更精确地确定模式的位置和方向，从而提供更可靠的货币检测。检测器离线训练示例说明，导致通过记录与要测试的图案类似的测试图案而生成的存储模板; 在所述模板内识别锚线，其进一步在随后的测试图案中表示。将模板旋转和移动，然后将其与测试图案匹配，使锚线与测试图案中检测到的长线对齐。然后比较模板和测试模式，以确定是否存在匹配。该系统包括微处理器，其被编程为便于离线扫描检测器，其中扫描到所述系统中的示例性记录，其中通过记录类似于要检测的测试图案的所述示例性记录的图像模式来生成模板。微处理器识别模板内的锚线，其进一步表示在所述测试图案中; 在将模板匹配到测试图案之前旋转和移动模板，使得锚线与可以在所述测试图案内检测到的线对齐; 并将模板与测试图案进行比较，以确定所述锚线是否存在于所述测试图案内。

57. 发明授权

US5900952A System for converting color image signals having high-frequency components from RGB to CMY color spaces 失效
标题翻译：用于将具有高频分量的彩色图像信号从RGB转换为CMY色彩空间的系统
公开(公告)号：US5900952A
公开(公告)日：1999-05-04
申请号：US730048
申请日：1996-10-15
申请人： Zhigang Fan
发明人： Zhigang Fan
IPC分类号： H04N1/60 , H04N9/64 , G03F3/08 , H04N5/21 , H04N9/77
CPC分类号： H04N1/6016 , H04N9/643
摘要： A system for converting original RGB color signals to CMY signals includes the step of separating color signals from the original image into low-frequency and high-frequency components. The low-frequency components are converted to CMY signals via a look-up table reflective of a non-linear algorithm, while the high-frequency components are converted to CMY signals according to linear algorithms. The technique avoids color distortion caused by high-frequency noise, such as from halftone screens, in the original image.
摘要翻译：用于将原始RGB彩色信号转换为CMY信号的系统包括将原始图像的颜色信号分离成低频和高频分量的步骤。低频分量通过反映非线性算法的查找表转换为CMY信号，而高频分量根据线性算法转换为CMY信号。该技术避免了由原始图像中的半色调屏幕引起的高频噪声引起的颜色失真。

58. 发明授权

US5493416A Method combining error diffusion and traditional halftoning with arbitrary screen orientation 失效
标题翻译：将误差扩散与传统半色调与任意屏幕方向相结合的方法
公开(公告)号：US5493416A
公开(公告)日：1996-02-20
申请号：US332011
申请日：1994-10-31
申请人： Zhigang Fan
发明人： Zhigang Fan
IPC分类号： G06T5/00 , H04N1/405 , H04N1/40
CPC分类号： H04N1/4052 , H04N1/4055
摘要： A block-based error diffusion technique allows for the printing of colored images having arbitrary screen orientations. The technique improves reproducibility by only compensating for errors arising from quantization in selected "critical blocks".
摘要翻译：基于块的误差扩散技术允许打印具有任意屏幕取向的彩色图像。该技术通过仅补偿所选择的“关键块”中由量化引起的误差来提高再现性。

59. 发明授权

US5339170A Image processing system and method employing hybrid filtering to provide improved reconstruction of continuous tone images from halftone screen-structured images 失效
标题翻译：使用混合滤波的图像处理系统和方法，从半色调屏幕结构图像提供连续色调图像的改进重建
公开(公告)号：US5339170A
公开(公告)日：1994-08-16
申请号：US815219
申请日：1991-12-31
申请人： Zhigang Fan
发明人： Zhigang Fan
IPC分类号： G06T5/00 , H04N1/40
CPC分类号： H04N1/40075
摘要： An image processing system converts screen structured halftone images to continuous tone images. Value data is sequentially generated for successive pixels of a halftone image. An averaging filter is provided for sequentially filtering each pixel in the halftone image in the horizontal image direction in accordance with a first predetermined filter to generate an intermediately filtered image. A pattern matching filter then sequentially filters each pixel in the intermediately filtered image in the vertical direction to generate a hybrid filtered image. The hybrid filter arrangement is then iteratively operated for three additional sets of orthogonal directions, i.e. the vertical and horizontal directions, a first diagonal direction and a second diagonal direction, and the second and first diagonal directions. The best hybrid image is generated as an output continuous tone image for storage and/or processing to a halftone copy or print.
摘要翻译：图像处理系统将屏幕结构的半色调图像转换为连续色调图像。为半色调图像的连续像素顺序产生数值数据。提供平均滤波器，用于根据第一预定滤波器顺序地对水印图像中的半色调图像中的每个像素进行滤波，以产生中间滤波的图像。然后，模式匹配滤波器顺序地过滤垂直方向上的中间滤波图像中的每个像素，以产生混合滤波图像。然后，对于三个附加的正交方向集合，即垂直和水平方向，第一对角线方向和第二对角线方向，以及第二和第一对角线方向，迭代地操作混合滤波器装置。生成最佳的混合图像作为用于存储和/或处理到半色调拷贝或打印的输出连续色调图像。

60. 发明授权

US09900519B2 Image capture by scene classification 有权
公开(公告)号：US09900519B2
公开(公告)日：2018-02-20
申请号：US15081281
申请日：2016-03-25
申请人： Zhigang Fan
发明人： Zhigang Fan
IPC分类号： H04N5/225 , H04N5/238 , G06K9/46 , H04N5/235 , G06K9/62 , H04N5/232 , G02B7/28
CPC分类号： H04N5/2352 , G02B7/285 , G06K9/4661 , G06K9/6267 , H04N5/23212
摘要： A method, a device and a computer readable for automatically identifying a Christmas tree scene and setting a camera's focus and/or exposure parameters in a way that yields images with high image quality. The Christmas tree scene identification can be performed by segmenting the image into bright and dark regions, identifying the light objects, collecting the statistics of the light objects, and classifying the scene based on the statistics of the light objects, or by collecting the pixel value statistics for the image, and classifying the scene based on the statistics of the pixel values, or by collecting the pixel value statistics for the image, filtering the image, collecting the pixel value statistics for the filtered image, and classifying the scene by comparing the statistics of the pixel values before and after filtering. The focus and exposure settings can be adjusted based on the Christmas tree scene identification results. For Christmas tree scenes, the exposure can be set based on a value that is adjusted upwards from the mean luminance of the image, or on a value that is calculated from the top luminance value. The focus can be set by identifying the lights in the image, and minimizing the light size in the image.

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