公开(公告)号：US4954889A

公开(公告)日：1990-09-04

申请号：US443880

申请日：1989-11-30

申请人： Kunio Endo ,  Tadashi Katsukawa

发明人： Kunio Endo ,  Tadashi Katsukawa

IPC分类号： H04N1/60

CPC分类号： H04N1/6016 ,  H04N1/6019

摘要： A color masking circuit and a color printer incorporating the color masking circuit which performs color masking processing upon color density data to indicate the density of the color picture elements. The color masking circuit includes a matrix coefficient table for holding predetermined matrix coefficients which are used in the masking of the inputted color density data. A matrix coefficient selector selects predetermined matrix coefficients from the matrix coefficient table according to the color density data correction to be performed. Multiplication and adder circuits are also provided for calculating the corrected color density data in accordance with the selected matrix coefficients. However, the matrix coefficients may be taken directly from a look-up table by addressing the table with the color density data to be corrected.

摘要翻译： 一种彩色掩蔽电路和一种彩色打印机，该彩色打印机结合有彩色掩蔽电路，对颜色密度数据执行彩色掩蔽处理，以指示彩色图像元素的密度。 彩色掩蔽电路包括用于保持预定矩阵系数的矩阵系数表，该矩阵系数用于掩蔽输入的色密度数据。 矩阵系数选择器根据要执行的颜色浓度数据校正从矩阵系数表中选择预定的矩阵系数。 还提供乘法和加法器电路，用于根据所选择的矩阵系数计算校正的色密度数据。 然而，矩阵系数可以通过用要校正的颜色密度数据寻址表来直接从查找表中获取。

公开(公告)号：US4894712A

公开(公告)日：1990-01-16

申请号：US261616

申请日：1988-10-24

申请人： Tadashi Katsukawa

发明人： Tadashi Katsukawa

IPC分类号： H04N1/40 ,  H04N1/405

CPC分类号： H04N1/4005 ,  H04N1/40031 ,  H04N1/4056

摘要： Disclosed is a density gradation control type thermal printer which comprises: a plurality of heating resistor elements arranged so as to correspond to a plurality of picture elements on every print line with one-to-one correspondency; selectively energizing the heating resistor elements be in current conduction each for a time of an integer multiple of a current conduction unit time for every print line to thereby give density gradation to the picture elements; and selectively energizing the heating resistor elements in a descending order of current/conduction time for every print line, and making the heating resistor elements terminate current conduction at the same time or in the ascending order of current conduction time.

摘要翻译： 公开了一种密度灰度控制型热敏打印机，其包括：多个加热电阻元件，其以与一对一对应的每个打印线对应于多个像素排列; 对于每个打印线，选择性地激励加热电阻元件的导通电流为导通单元时间的整数倍的时间，从而给图像元素提供浓度梯度; 并且以每个印刷线的电流/导通时间的降序选择性地激励加热电阻元件，并且使加热电阻元件同时或按照导通时间的升序终止电流传导。