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    • 4. 发明授权
    • Subjectively pleasing color gamut mapping in a color computer graphics
system
    • 在彩色计算机图形系统中主观令人满意的色域映射
    • US5903275A
    • 1999-05-11
    • US813053
    • 1997-03-07
    • Randall G. Guay
    • Randall G. Guay
    • G06T1/00G09G5/00G09G5/06H04N1/46H04N1/60G06T5/20
    • H04N1/6058
    • If we assume that images to be printed will consist of a combination of natural images and computer generated images, we would like the natural images to map to the closest printable colors, and the computer generated images to map to the saturated printer colors. Usually, we cannot tell the source of a color specification, so one algorithm must suffice for both conditions. A method to combine the two is presented. First, the printable colors are measured is some device independent color sapce, such as L*a*b*. Next, the range of colors from some reference color CRT, consisting of the colors from black to monitor saturates, and the colors between, then from saturates to white, and the colors between, are calculated. The saturates are assigned colors based on what printable color a user would like to get when the user asks for a saturated CRT color. A good coice would be the color space defined by CCIR 709, but any color space could be used. This gives us the printer's representation of the outer range of the color gamut of the CRT. Next, a table is generated which subsample all colors available to the specified color space. This table fills in entries within the color gamut of the target printer with the closest printable color. Colors out of the printer's gamut are represented by an averaging of the printable colors and of the outer range of colors assigned for the saturates. A requested color is converted to the reference color space, then looked up in the table, and the resulting color specification is sent to the printer.
    • 如果我们假设要打印的图像将由自然图像和计算机生成的图像的组合组成,我们希望自然图像映射到最接近的可打印颜色,并且计算机生成图像以映射到饱和打印机颜色。 通常,我们不能指出颜色规范的来源,所以一个算法必须满足这两个条件。 提出了一种组合两者的方法。 首先,可打印的颜色是测量一些独立于设备的颜色,如L * a * b *。 接下来,计算从黑色到监视器饱和度的颜色之间的颜色和从饱和度到白色之间的颜色以及颜色之间的颜色的一些参考颜色CRT的颜色范围。 饱和度根据用户要求饱和CRT色彩时用户想要获取的可打印颜色分配颜色。 一个好的coice将是由CCIR 709定义的颜色空间,但可以使用任何颜色空间。 这给了我们打印机对CRT的色域的外部范围的表示。 接下来,生成一个表,用于对可用于指定颜色空间的所有颜色进行采样。 该表以最接近的可打印颜色填充目标打印机色域内的条目。 打印机色域中的颜色由平均的可打印颜色和为饱和度分配的颜色的外部范围表示。 将所请求的颜色转换为参考颜色空间,然后在表格中查找,并将生成的颜色规格发送到打印机。
    • 6. 发明授权
    • Dual mode servo
    • 双模伺服
    • US4574227A
    • 1986-03-04
    • US550950
    • 1983-11-14
    • John C. HerderRandall G. Guay
    • John C. HerderRandall G. Guay
    • G05B19/39G05B11/18G05B13/00
    • G05B19/39G05B2219/41021G05B2219/42114G05B2219/42171
    • A dual mode, digital servo positioning system controls servo motor current by a processor-generated current control set point in conjunction with velocity feedback. When the motor has advanced to the vicinity of a target position, the processor opens the velocity feedback loop and reduces servo amplifier gain, such that the set point controls motor current without velocity feedback. This open loop condition provides a springy servo response that eliminates oscillation due to small deviations from target position caused by electronic drift or gravity. Position information is provided to the processor by means of quadrature encoded tachometer pulses from the motor.
    • 双模式数字伺服定位系统通过处理器生成的电流控制设定点结合速度反馈来控制伺服电机电流。 当电机前进到目标位置附近时,处理器打开速度反馈回路并降低伺服放大器增益,使得设定点无需速度反馈控制电机电流。 这种开环条件提供弹性伺服响应,消除由于电子漂移或重力引起的与目标位置的小偏差的振荡。 位置信息通过来自电动机的正交编码转速计脉冲提供给处理器。
    • 8. 发明申请
    • PRINT COLOR MANAGEMENT
    • 打印颜色管理
    • US20100123911A1
    • 2010-05-20
    • US12274520
    • 2008-11-20
    • Randall G. Guay
    • Randall G. Guay
    • H04N1/60
    • H04N1/603
    • In one embodiment, computer readable instructions for: displaying together in a single display a group of user selectable icons each representing a discrete color scheme for printing an image; and then, in direct response to a user selecting one of the icons, displaying a color preview of the image as the image will appear when printed with the selected color scheme. In another embodiment, computer readable instructions for: allowing a user to select a color scheme, which selects a first color profile; allowing the user to select a printer, which selects a second color profile; identifying a third color profile for a display device; transforming image source data into image print data using the first and second color profiles; transforming the image print data into image display data using the second and third color profiles; and displaying the image on the display device using the image display data.
    • 在一个实施例中,计算机可读指令用于:在单个显示器中一起显示一组用户可选择的图标,每个表示用于打印图像的离散色彩方案; 然后,直接响应于用户选择其中一个图标,当以所选择的配色方案打印时,显示图像的颜色预览将作为图像出现。 在另一个实施例中,计算机可读指令用于:允许用户选择选择第一颜色配置文件的配色方案; 允许用户选择选择第二颜色配置文件的打印机; 识别显示设备的第三颜色配置文件; 使用第一和第二颜色轮廓将图像源数据变换成图像打印数据; 使用第二和第三颜色轮廓将图像打印数据变换成图像显示数据; 以及使用所述图像显示数据在所述显示装置上显示所述图像。