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    • 10. 发明申请
    • Technique for printing a color image
    • 打印彩色图像的技术
    • US20050219344A1
    • 2005-10-06
    • US11113841
    • 2005-04-25
    • Alain BouchardAnemarie DeYoungStephen TelferWilliam Vetterling
    • Alain BouchardAnemarie DeYoungStephen TelferWilliam Vetterling
    • B41J2/355B41J2/21B41J2/525H04N1/50B41J2/385B41J2/325B41J33/00
    • H04N1/506B41J2/2132
    • A technique for optimizing or enhancing color images. Embodiments are disclosed for creating an enhanced color image, including the enhancement of perceived color uniformity. In a “dot-on-dot” registration scheme for producing color images, the dots need to be precisely superimposed on each other to provide optimum or enhanced images. The dot-on-dot registration produced by a single head thermal printer is generally acceptable, but a single head machine is very slow because multiple passes (reciprocation) are required to lay down multiple colors of dots. In a much faster multi-head or tandem thermal imaging system a serious problem of dot misalignment may cause moire patterns or other visual artifacts in the color images produced by dot patterns. A solution to this problem is disclosed herein which intentionally misregisters superimposed dots in a novel and particular manner to achieve image optimization. In a particular embodiment a first thermal print head has a first number of thermal elements energized at a first rate and a second thermal print head has a second number of thermal elements energized at a second rate. The numbers of thermal elements and rates of energization are selected to cause intentional misregistration at a high spatial frequency which is unnoticeable to the naked eye of a viewer of the image, thereby masking any unintentional mechanical misalignment of the print heads while maintaining imperceptible the intentional misregistraton of the solution to the problem.
    • 一种优化或增强彩色图像的技术。 公开了用于创建增强的彩色图像的实施例,包括增强感知的颜色均匀性。 在用于产生彩色图像的“点对点”注册方案中,这些点需要彼此精确地叠加以提供最佳或增强的图像。 由单头热敏打印机产生的点对点注册通常是可以接受的,但是由于需要多次通过(往复运动)才能放置多个点的颜色,因此单头机器非常慢。 在更快的多头或串联热成像系统中,点错位的严重问题可能会导致由点图案产生的彩色图像中的莫尔图案或其他视觉伪影。 本文公开了解决这个问题的方法,其以新颖和特定的方式有意地错配了叠加点以实现图像优化。 在特定实施例中,第一热敏打印头具有以第一速率通电的第一数量的热元件,而第二热打印头具有以第二速率通电的第二数量的热元件。 选择热元件的数量和通电率,以在图像的观察者的肉眼看不到的高空间频率处引起有意的对准,从而掩蔽了打印头的任何无意的机械不对准,同时保持不可察觉的有意的误配 的解决方案的问题。