Ink relocation for color halftones
    4.
    发明授权
    Ink relocation for color halftones 失效
    彩色墨水的墨水搬迁

    公开(公告)号:US5991512A

    公开(公告)日:1999-11-23

    申请号:US904026

    申请日:1997-07-31

    CPC分类号: H04N1/58

    摘要: Current methodologies for color image halftoning produce prominent halftoning noise. Brightness variations between color dots placed at neighboring locations are a primary cause of color halftone noise. To correct this flaw, an Ink Relocation Postprocess to halftoning algorithms relocates ink drops between neighboring drop locations in order to reduce local brightness variations. Due to the intrinsic blurring side-effect of ink relocation, some enhancement may be desired. Two application-specific enhancement procedures are presented. In the first enhancement, ink relocation is suppressed in areas of fine detail. In the second enhancement, edge sharpening is performed after ink relocation.

    摘要翻译: 彩色图像半色调的当前方法产生突出的半色调噪声。 放置在相邻位置的色点之间的亮度变化是颜色半色调噪声的主要原因。 为了纠正这个缺陷,墨水重新布置后处理到半色调算法重新定位相邻墨滴位置之间的墨滴,以减少局部亮度变化。 由于油墨重新定位的固有的模糊副作用,可能需要一些增强。 介绍了两个应用特定的增强过程。 在第一个增强中,在精细细节的区域中抑制了油墨重新定位。 在第二次增强中,在油墨重新定位之后执行边缘锐化。

    Color halftone error-diffusion with local brightness variation reduction
    5.
    发明授权
    Color halftone error-diffusion with local brightness variation reduction 失效
    颜色半色调误差扩散与局部亮度变化减小

    公开(公告)号:US5991438A

    公开(公告)日:1999-11-23

    申请号:US903899

    申请日:1997-07-31

    CPC分类号: H04N1/52

    摘要: Error diffusion algorithms such as the celebrated Floyd Steinberg error-diffusion algorithm are high-performance halftoning methods in which quantization errors are diffused to "future" pixels. Originally intended for grayscale images, they are traditionally extended to color images by error-diffusing each of the three color planes independently (separable error-diffusion). Adding a design rule which is based on certain characteristics of human color perception to the error-diffusion paradigm results in a color halftoning algorithm having output of considerably higher quality when compared to separable error-diffusion. These benefits are achieved by adding the Minimum Brightness Variation Criterion (MBVC) to the design rules of color error-diffusion halftoning methods. Halftone values are constrained to be vertices of a Minimum Brightness Variation Quadruple (MBVQ) associated with each pixel of the color image being processed. The algorithm presented requires no additional memory and entails a reasonable increase in run-time.

    摘要翻译: 诸如着名的弗洛伊德·斯坦伯格误差扩散算法之类的误差扩散算法是将量化误差扩散到“未来”像素的高性能半色调方法。 最初用于灰度图像,它们通常通过错误地扩散三个色平面中的每一个(可分离的误差扩散)来扩展到彩色图像。 将基于人类颜色感知的某些特征的设计规则添加到误差扩散范例导致与可分离的误差扩散相比,具有相当高质量的输出的色彩色调算法。 通过将最小亮度变化标准(MBVC)添加到颜色误差扩散半色调方法的设计规则中来实现这些优点。 半色调值被限制为与正在处理的彩色图像的每个像素相关联的最小亮度变化四倍(MBVQ)的顶点。 所提出的算法不需要额外的内存,并且需要合理的增加运行时间。

    Space varying gamut mapping
    7.
    发明授权
    Space varying gamut mapping 失效
    空间变化色域映射

    公开(公告)号:US06882449B2

    公开(公告)日:2005-04-19

    申请号:US09882038

    申请日:2001-06-18

    IPC分类号: B41J2/52 H04N1/46 H04N1/60

    CPC分类号: H04N1/6058

    摘要: A method an apparatus uses a variational approach for space dependent gamut mapping. The method presents a new measure for the problem. A solution to the formulation according to the method is unique if the gamut of the target device is known. A quadratic programming efficient numerical solution provides real-time results.

    摘要翻译: 一种装置使用变分方法进行空间依赖色域映射的方法。 该方法为问题提出了新的措施。 如果目标设备的色域是已知的,则根据该方法的配方的解决方案是独特的。 二次规划有效数值解决方案提供实时的结果。

    Method and apparatus for performing local color correction
    8.
    发明授权
    Method and apparatus for performing local color correction 失效
    用于执行局部色彩校正的方法和装置

    公开(公告)号:US06813041B1

    公开(公告)日:2004-11-02

    申请号:US09540162

    申请日:2000-03-31

    IPC分类号: H04N160

    CPC分类号: G06T5/20

    摘要: The invention is directed towards method and apparatus for performing local color correction. One embodiment of the invention is a two-part process. The first part derives an image mask from an input image. In some embodiments, the mask is an inverted, low-pass filtered, monochrome version of the input image. The second part combines the derived mask with the input image through a non-linear operation. In some embodiments, the combination operation is a variable exponential function that has the mask values as part of its exponent and the pixel values as part of its base.

    摘要翻译: 本发明涉及用于执行局部色彩校正的方法和装置。 本发明的一个实施方案是两部分方法。 第一部分从输入图像中导出图像掩码。 在一些实施例中,掩模是输入图像的倒置,低通滤波的单色版本。 第二部分通过非线性操作将导出的掩模与输入图像相结合。 在一些实施例中,组合操作是具有作为其指数的一部分的掩码值和作为其基础的一部分的像素值的可变指数函数。

    Method and system for providing extensive coverage of an object using virtual cameras
    9.
    发明申请
    Method and system for providing extensive coverage of an object using virtual cameras 审中-公开
    使用虚拟相机提供对物体的广泛覆盖的方法和系统

    公开(公告)号:US20060028476A1

    公开(公告)日:2006-02-09

    申请号:US10911463

    申请日:2004-08-03

    申请人: Irwin Sobel

    发明人: Irwin Sobel

    IPC分类号: G06T15/70 G06T13/00

    CPC分类号: G06T13/00

    摘要: A system and method for generating texture information. Specifically, a method provides for extensive coverage of an object using virtual cameras. The method begins by tracking a moveable object in a reference coordinate system. By tracking the moveable object, an object based coordinate system that is tied to the object can be determined. The method continues by collecting at least one replacement image from at least one video sequence of the object to form a subset of replacement images of the object. The video sequence of the object is acquired from at least one reference viewpoint, wherein the reference viewpoint is fixed in the reference coordinate system but moves around the object in the object based coordinate system. The subset of replacement images is stored for subsequent incorporation into a rendered view of the object.

    摘要翻译: 一种用于生成纹理信息的系统和方法。 具体地说,一种方法提供了使用虚拟相机广泛覆盖对象的方法。 该方法通过跟踪参考坐标系中的可移动对象开始。 通过跟踪可移动对象,可以确定绑定到对象的基于对象的坐标系。 该方法通过从对象的至少一个视频序列收集至少一个替换图像来继续以形成对象的替换图像的子集。 从至少一个参考视点获取对象的视频序列,其中参考视点固定在参考坐标系中,但是在基于对象的坐标系中围绕对象移动。 存储替换图像的子集以便随后并入到对象的呈现视图中。

    Local color correction
    10.
    发明授权
    Local color correction 失效
    局部颜色校正

    公开(公告)号:US06822762B2

    公开(公告)日:2004-11-23

    申请号:US10136966

    申请日:2002-05-02

    IPC分类号: H04N160

    CPC分类号: H04N1/407 G06T5/20

    摘要: An input image represented by a set of input pixel values is color-corrected by locally modifying the input pixel values according to pixel neighborhoods; and determining an output image having a set of output pixel values. Each set of output pixel values equals a non-linear combination of a set of input pixel values and its corresponding set of modified pixel values.

    摘要翻译: 由一组输入像素值表示的输入图像通过根据像素邻域局部修改输入像素值进行颜色校正; 以及确定具有一组输出像素值的输出图像。 每组输出像素值等于一组输入像素值和其对应的修改像素值集合的非线性组合。