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    • 32. 发明授权
    • De-screening halftones using sigma filters
    • 使用sigma过滤器去筛选半色调
    • US06947178B2
    • 2005-09-20
    • US09791653
    • 2001-02-26
    • Chungkui KuoRavishankar RaoGerhard R. Thompson
    • Chungkui KuoRavishankar RaoGerhard R. Thompson
    • G06T5/20G06T5/00H04N1/40H04N1/409H04N1/405
    • G06T5/002G06T5/20G06T2207/10008G06T2207/10024G06T2207/20192G06T2207/30176H04N1/40075
    • 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.
    • 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。
    • 35. 发明授权
    • System and method for smooth pointing of objects during a presentation
    • 演示期间物体平滑指向的系统和方法
    • US08159501B2
    • 2012-04-17
    • US12172222
    • 2008-07-12
    • Ravishankar Rao
    • Ravishankar Rao
    • G09G5/02
    • G06F3/0481
    • A system and method are provided that allows a speaker to provide real-time annotations to one or more displayed images during a presentation. The speaker inputs the annotations my manually identify a portion of the displayed image using an input mechanism such as a touch screen that is in communication with a presentation monitor and a control system that is controlling the presentation. The identified portions are annotated onto the displayed images using a adaptive color that is selected to provide optimum contrast with the existing colors in the displayed image. In addition to providing adaptive, contrasting colors for the annotations, imperfection such as waviness are removed from the identified portions to created corrected portions that are then annotated onto the presentation image. Annotation is accomplished through computer generated graphics or through the use of a motorized, controllable laser pointer.
    • 提供了一种系统和方法,其允许扬声器在呈现期间向一个或多个所显示的图像提供实时注释。 扬声器输入注释,使用诸如与呈现监视器和正在控制呈现的控制系统通信的触摸屏的输入机构来手动识别所显示图像的一部分。 所识别的部分使用被选择以提供与所显示的图像中的现有颜色的最佳对比度的自适应颜色来注释到所显示的图像上。 除了为注释提供自适应的对比颜色之外,诸如波纹的不完美性从识别的部分中移除以产生校正的部分,然后将其注释到呈现图像上。 注释是通过计算机生成的图形或通过使用电动的,可控的激光指示器完成的。
    • 39. 发明申请
    • System and method for smooth pointing of objects during a presentation
    • 演示期间物体平滑指向的系统和方法
    • US20070206024A1
    • 2007-09-06
    • US11367518
    • 2006-03-03
    • Ravishankar Rao
    • Ravishankar Rao
    • G09G5/02
    • G06F3/0481
    • A system and method are provided that allows a speaker to provide real-time annotations to one or more displayed images during a presentation. The speaker inputs the annotations my manually identify a portion of the displayed image using an input mechanism such as a touch screen that is in communication with a presentation monitor and a control system that is controlling the presentation. The identified portions are annotated onto the displayed images using a adaptive color that is selected to provide optimum contrast with the existing colors in the displayed image. In addition to providing adaptive, contrasting colors for the annotations, imperfection such as waviness are removed from the identified portions to created corrected portions that are then annotated onto the presentation image. Annotation is accomplished through computer generated graphics or through the use of a motorized, controllable laser pointer.
    • 提供了一种系统和方法,其允许扬声器在呈现期间向一个或多个所显示的图像提供实时注释。 扬声器输入注释,使用诸如与呈现监视器和正在控制呈现的控制系统通信的触摸屏的输入机构来手动识别所显示图像的一部分。 所识别的部分使用被选择以提供与所显示的图像中的现有颜色的最佳对比度的自适应颜色来注释到所显示的图像上。 除了为注释提供自适应的对比颜色之外,诸如波纹的不完美性从识别的部分中移除以产生校正的部分,然后将其注释到呈现图像上。 注释是通过计算机生成的图形或通过使用电动的,可控的激光指示器完成的。