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    Image processing system
    1.
    发明公开
    Image processing system 失效
    图像处理系统

    公开(公告)号：EP0500267A2

    公开(公告)日：1992-08-26

    申请号：EP92301204.1

    申请日：1992-02-13

    申请人： AT&T Corp.

    发明人： Johnston, James David ,  Neuhoff, David Lee ,  Pappas, Thrasyvoulos Nicholaou ,  Safranek, Robert James ,  Seshadri, Nambirajan

    IPC分类号： H04N1/40

    CPC分类号： H04N1/4052 ,  H04N1/4105 ,  H04N5/85 ,  H04N5/9261 ,  H04N19/102 ,  H04N19/13 ,  H04N19/50 ,  H04N19/61 ,  H04N19/63 ,  H04N19/94

    摘要： An image-processing system for perceptual coding of images by analyzing one or more images to determine levels of imperceptible noise and encoding a first image to produce encoded values without introducing noise exceeding a determined level of imperceptible noise is disclosed. Analyzing of images is carried out under a set of user determined conditions comprising viewing distance and lighting. The encoded image is communicated and decoded to produce representation of the first image for display. As part of displaying the representation of the first image, a halftoning process is carried out. The halftoning process may comprise the interpolation of data values of the representation of the first image as well as the addition of micro-dither to the representation. Illustrative halftoning techniques include classical halftoning, least-squares halftoning, and error diffusion halftoning. Printer model-based halftoning techniques for both least-squares halftoning and error diffusion halftoning are presented. Applications of the model-based halftoning techniques for systems employing conventional coding of images are also discussed.

    摘要翻译： 公开了一种图像处理系统，用于通过分析一个或多个图像来确定图像的感知编码以确定不可察觉噪声的水平，并对第一图像进行编码以产生编码值，而不引入超过确定水平的不可察觉噪声的噪声。 图像分析是在一组用户确定的条件下进行的，包括观看距离和照明。 编码的图像被传送和解码以产生用于显示的第一图像的表示。 作为显示第一图像的表示的一部分，执行半色调处理。 半色调处理可以包括对第一图像的表示的数据值的插值以及将微抖动添加到该表示。 说明性半色调技术包括经典半色调，最小二乘半色调和误差扩散半色调。 提出了基于打印机模型的半色调技术，用于最小二乘半色调和误差扩散半色调。 还讨论了基于模型的半色调技术在采用常规图像编码的系统中的应用。

    Image processing system
    3.
    发明公开
    Image processing system 失效

    公开(公告)号：EP0500267A3

    公开(公告)日：1993-05-19

    申请号：EP92301204.1

    申请日：1992-02-13

    申请人： AT&T Corp.

    发明人： Johnston, James David ,  Neuhoff, David Lee ,  Pappas, Thrasyvoulos Nicholaou ,  Safranek, Robert James ,  Seshadri, Nambirajan

    IPC分类号： H04N1/40

    CPC分类号： H04N1/4052 ,  H04N1/4105 ,  H04N5/85 ,  H04N5/9261 ,  H04N19/102 ,  H04N19/13 ,  H04N19/50 ,  H04N19/61 ,  H04N19/63 ,  H04N19/94

    摘要： An image-processing system for perceptual coding of images by analyzing one or more images to determine levels of imperceptible noise and encoding a first image to produce encoded values without introducing noise exceeding a determined level of imperceptible noise is disclosed. Analyzing of images is carried out under a set of user determined conditions comprising viewing distance and lighting. The encoded image is communicated and decoded to produce representation of the first image for display. As part of displaying the representation of the first image, a halftoning process is carried out. The halftoning process may comprise the interpolation of data values of the representation of the first image as well as the addition of micro-dither to the representation. Illustrative halftoning techniques include classical halftoning, least-squares halftoning, and error diffusion halftoning. Printer model-based halftoning techniques for both least-squares halftoning and error diffusion halftoning are presented. Applications of the model-based halftoning techniques for systems employing conventional coding of images are also discussed.