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    • 6. 发明授权
    • Image enhancement method and apparatus for internet printing
    • 图像增强方法和互联网打印设备
    • US06535221B1
    • 2003-03-18
    • US09519288
    • 2000-03-06
    • Daniel J. AllenVladimir Levantovsky
    • Daniel J. AllenVladimir Levantovsky
    • G09G536
    • G06T3/403
    • A method for enhancing a digital image for printing or display on a high resolution device is described. The method includes receiving a digital source image and selecting a block of source pixels from the image. An edge array is generated from edges detected in the block of source pixels and processed with a set of logic operations to detect one of a set of edge patterns. The source coordinate system is transformed into a second coordinate system in response to the detected edge pattern and a transformed source location for the output pixel is determined. A modified transformed source location is determined by applying a modifier function. The modifier function is selected from a set of functions in response to the detected edge pattern. An effective source location is generated by applying a reverse transformation. The value of the output pixel is interpolated from the values of the block of source pixels based on the effective source location.
    • 描述了用于增强用于在高分辨率设备上打印或显示的数字图像的方法。 该方法包括接收数字源图像并从图像中选择源像素块。 从源像素块中检测到的边缘生成边缘阵列,并用一组逻辑运算进行处理,以检测一组边缘图案之一。 源坐标系被响应于检测到的边缘图案变换成第二坐标系,并且确定用于输出像素的变换的源位置。 通过应用修饰符函数来确定经修改的变换源位置。 响应于检测到的边缘图案,从一组函数中选择修饰函数。 通过应用反向变换产生有效的源位置。 基于有效源位置,从源像素块的值内插输出像素的值。
    • 8. 发明申请
    • Method and system for inter-channel clock frequency selection with periodic halftoning
    • 具有周期性半色调的通道间时钟频率选择的方法和系统
    • US20060274338A1
    • 2006-12-07
    • US11146195
    • 2005-06-07
    • Kenneth CrounseVladimir Levantovsky
    • Kenneth CrounseVladimir Levantovsky
    • G06F15/00
    • H04N1/40068H04N1/405H04N1/4058H04N1/52
    • At least two different pixel clock frequencies or pixel pitches are used when generating an image. They are used with periodic halftone patterns in a color scanning printing process. By using different clock frequencies for the different color separations, more options for screen geometry are available, and therefore new screen sets with desirable moiré behavior are possible. This is especially important on low resolution devices, such as 1200 dpi and below. Here there are a limited number of rational tangent screen geometries that are available and moiré canceling or moiré averting combinations are scarce. The different pixel clock frequency are used when writing at least two color channels in order to provide otherwise unavailable halftone geometries.
    • 当生成图像时,至少使用两个不同的像素时钟频率或像素间距。 它们与彩色扫描打印过程中的定期半色调图案一起使用。 通过为不同的色彩分色使用不同的时钟频率,可以使用更多的屏幕几何选项,因此可以使用具有令人满意的莫尔行为的新屏幕。 这对于低分辨率设备尤其重要,如1200 dpi及以下。 这里有一些有限数量的合理切线几何可用,并且波纹消除或莫尔条纹组合很少。 在写入至少两个颜色通道时使用不同的像素时钟频率,以提供否则不可用的半色调几何。
    • 9. 发明授权
    • Method and system for pixel clock recovery
    • 像素时钟恢复方法和系统
    • US06522365B1
    • 2003-02-18
    • US09491761
    • 2000-01-27
    • Vladimir LevantovskyDaniel J. Allen
    • Vladimir LevantovskyDaniel J. Allen
    • H04N506
    • G09G5/008H04N5/126
    • A method of recovering a pixel clock for generating a digital image from an analog video signal is presented. The on and off-transition times for the active video portion of a digital image and the image size defined in a video standard are used to generate a pixel clock. The analog video signal is digitized according to the pixel clock and the image size of the resulting digital image is compared with the image size defined in the video standard. The pixel clock frequency is adjusted in response to the image size comparison. The optimum phase of the pixel clock relative to the analog video signal is determined through a repetitive phase adjustment technique. A first image coordinate is determined for a pixel clock at one phase and a subsequent image coordinate is determined for a pixel clock after decrementing the phase of the pixel clock. The first image coordinate and the subsequent image are compared. If the coordinates are not equal, the steps of decrementing the phase of the pixel clock and determining a corresponding image coordinate are repeated until equal coordinates are determined. The phase of the pixel clock is then adjusted by a predetermined value to yield an optimum phase.
    • 提出了从模拟视频信号中恢复生成数字图像的像素时钟的方法。 使用数字图像的活动视频部分的开和关转换时间以及视频标准中定义的图像大小来生成像素时钟。 根据像素时钟将模拟视频信号数字化,并将所得数字图像的图像大小与视频标准中定义的图像大小进行比较。 响应于图像尺寸比较来调整像素时钟频率。 通过重复相位调整技术确定像素时钟相对于模拟视频信号的最佳相位。 对于一个相位的像素时钟确定第一图像坐标,并且在递减像素时钟的相位之后为像素时钟确定后续图像坐标。 比较第一图像坐标和后续图像。 如果坐标不相等,则重复降低像素时钟的相位并确定对应的图像坐标的步骤,直到确定相等的坐标。 然后将像素时钟的相位调整预定值以产生最佳相位。