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    • 22. 发明授权
    • Apparatus and method of performing dithering in a simplex in color space
    • 在彩色空间中以单形形式进行抖动的装置和方法
    • US06304333B1
    • 2001-10-16
    • US09136558
    • 1998-08-19
    • Doron ShakedNur AradIzhak BaharavQian Lin
    • Doron ShakedNur AradIzhak BaharavQian Lin
    • B41B1308
    • H04N1/52H04N1/54
    • A pixel color in an image can be represented by a dot color in a dot pattern as follows. A subset of a limited set of display colors is selected. The subset has N display colors that can render a solid color patch of the pixel color. The colors of the subset correspond to vertices of a simplex in the color space. The simplex has (N−1) dimensions. A point operation is then performed to select one of the vertices of the simplex and thereby select the dot color of the subset color corresponding to the selected vertex. Consequently, a solid patch of the pixel color can be rendered by a dot pattern having no more than N different colors. The dot pattern can be displayed by an imaging device such as an inkjet printer, which has a limited set of display colors.
    • 图像中的像素颜色可以由点阵图案中的点颜色表示如下。 选择一组有限的显示颜色的子集。 该子集具有N个显示颜色,可以渲染像素颜色的纯色块。 子集的颜色对应于颜色空间中单纯形的顶点。 单形具有(N-1)维度。 然后执行点操作以选择单形的一个顶点,从而选择与所选顶点对应的子集颜色的点颜色。 因此,可以通过具有不多于N种不同颜色的点图案来呈现像素颜色的固体斑块。 点图案可以由具有有限的显示颜色的诸如喷墨打印机的成像装置显示。
    • 23. 发明授权
    • Color halftone error-diffusion with local brightness variation reduction
    • 颜色半色调误差扩散与局部亮度变化减小
    • US5991438A
    • 1999-11-23
    • US903899
    • 1997-07-31
    • Doron ShakedNur AradAndrew FitzhughIrwin SobelMichael D. McGuire
    • Doron ShakedNur AradAndrew FitzhughIrwin SobelMichael D. McGuire
    • H04N9/64G06T5/00H04N1/52H04N1/60H04N1/405
    • H04N1/52
    • 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.
    • 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。
    • 29. 发明授权
    • Image processing method and apparatus
    • 图像处理方法和装置
    • US08605332B2
    • 2013-12-10
    • US12597254
    • 2007-04-25
    • Mani FischerDoron ShakedCraig BreenDror KellaGidi Amir
    • Mani FischerDoron ShakedCraig BreenDror KellaGidi Amir
    • H04N1/40
    • H04N1/4092
    • An image processing method (300) for converting an original image (601) into a final, pixelated image (610) suitable for printing on a printer arranged to print two-tone images and capable of printing partial area exposed pixels, comprises antialiasing (301) the original image (601) into an intermediate pixelated image (605) comprising greyscale pixels having assigned greyscale values. The method comprises the further-step, of translating (302) the intermediate image (605) into the final, pixelated image (610) by translating the assigned greyscale values into partial exposure values indicative of the amount of desired pixel area for a corresponding pixel or pixels in the final image.
    • 一种图像处理方法(300),用于将原始图像(601)转换成适于在布置成打印双色调图像并且能够打印部分区域曝光的像素的打印机上进行打印的最终像素化图像(610),包括抗锯齿 )原始图像(601)变成包括具有分配的灰度值的灰度像素的中间像素化图像(605)。 该方法包括通过将分配的灰度值转换成指示相应像素的期望像素面积的量的部分曝光值将中间图像(605)转换(302)到最终像素化图像(610)中的步骤 或最终图像中的像素。