公开(公告)号：US5867607A

公开(公告)日：1999-02-02

申请号：US617032

申请日：1996-03-18

申请人： Takeshi Shibuya ,  Tatsunari Satou ,  Taisaku Seino

发明人： Takeshi Shibuya ,  Tatsunari Satou ,  Taisaku Seino

IPC分类号： B41J2/52 ,  G06T5/00 ,  H04N1/405 ,  H04N1/52 ,  G06K9/38 ,  H04N1/40

CPC分类号： H04N1/52

摘要： A raster device such as a digital printer or the like which sequentially compares input image data with each element in a threshold matrix to convert the input image data into binary or multi-level pixel data. For providing both a higher resolution and a larger number of halftone levels for an output image at a low cost, an input image is decomposed into four color planes as CMYK data, and data on each color plane is compared with a dither matrix in a binarization circuit to be converted to binary data. The dither matrix generates a dither pattern composed of eight clusters having substantially the same shape as a kernel cluster capable of expressing 15 or more halftone levels. In this way, a smooth gradation having 120 or more halftone levels is realized by repetitively applying a small pattern having approximately 15 halftone levels.

摘要翻译： 诸如数字打印机等的光栅装置顺序地将输入图像数据与阈值矩阵中的每个元素进行比较，以将输入图像数据转换为二进制或多级像素数据。 为了以低成本为输出图像提供更高分辨率和更大数量的半色调水平，输入图像被分解成四个颜色平面作为CMYK数据，并且将每个颜色平面上的数据与二值化中的抖动矩阵进行比较 电路转换为二进制数据。 抖动矩阵产生由能够表达15个或更多半色调水平的核心簇具有基本相同形状的8个簇组成的抖动图案。 以这种方式，通过重复施加具有大约15个半色调水平的小图案来实现具有120个或更多半色调水平的平滑等级。

公开(公告)号：US5838465A

公开(公告)日：1998-11-17

申请号：US566108

申请日：1995-12-01

申请人： Tatsunari Satou ,  Taisaku Seino ,  Takeshi Shibuya

发明人： Tatsunari Satou ,  Taisaku Seino ,  Takeshi Shibuya

IPC分类号： G03F3/08 ,  H04N1/60 ,  G06K9/00

CPC分类号： H04N1/6033

摘要： A color correcting method for a color image generating apparatus for overlapping 3 or 4 color materials according to color image data of 3 separated colors of yellow (Y), magenta (M) and cyan (C) or of 4 separated colors of Y, M, C and black (K) to obtain a multicolor image, wherein the apparatus includes a color detector, a test pattern is printed in a vertical/horizontal stripe form of 2-color combinations of 2 of the 3 or 4 colors and is measured by the color detector to find a hue value, a relative overlap deviation of the colors Y, M, C or Y, M, C, K is calculated from the found hue value, and an irradiation start position of a semiconductor laser in a main-scan direction and an irradiation start position of the semiconductor laser in a feed direction are controlled to correct the relative overlap deviation. Or a color correcting method and apparatus in which a color correction coefficient or one of a plurality of color correction tables previously prepared for overlap deviations corresponding to the color drift is selected and set in color correcting means for color correction, or color drifts in a continuous print mode and in a non-continuous print mode are corrected.

摘要翻译： 根据黄色（Y），品红色（M）和青色（C）的3种分离颜色的彩色图像数据或Y，M的4种分离颜色，重叠3或4种颜色材料的彩色图像产生装置的颜色校正方法 ，C和黑色（K），以获得多色图像，其中该装置包括颜色检测器，测试图案以3或4种颜色的2种2色组合的垂直/水平条纹形式印刷，并通过 根据所发现的色调值计算颜色Y，M，C或Y，M，C，K的相对重叠偏差，以及主色调中的半导体激光器的照射开始位置， 扫描方向和半导体激光器在进给方向的照射开始位置被控制以校正相对重叠偏差。 或者颜色校正方法和装置，其中选择预先准备用于与颜色漂移相对应的重叠偏差的颜色校正系数或多个颜色校正表中的一个，并将其设置在用于颜色校正的颜色校正装置中，或者在连续的颜色校正装置中进行颜色漂移 打印模式和非连续打印模式被更正。

公开(公告)号：US6031629A

公开(公告)日：2000-02-29

申请号：US3597

申请日：1998-01-07

申请人： Takeshi Shibuya ,  Tatsunari Satou ,  Taisaku Seino

发明人： Takeshi Shibuya ,  Tatsunari Satou ,  Taisaku Seino

IPC分类号： B41J2/52 ,  G03G15/01 ,  H04N1/407 ,  H04N1/60 ,  G03G13/01

CPC分类号： H04N1/6027 ,  H04N1/6091

摘要： In the picture quality stabilizer for a color laser printer, changes in the gray level characteristic and the color balance caused by changes in temperature and humidity are compensated in order to stabilize the reproduced image. The apparatus includes a temperature and humidity sensor, an upper-bound correction table, a gamma correction table and a mixed color correction table, each optimized with respect to a reference environment, interpolation means for those tables, and a gray level correction means for correcting the gray level with correction coefficients obtained by the interpolation means and the mixed color correction means for compensating any failure of the color balance with the linear transformation. With this configuration, the correction coefficients are so modified as to establish a stable gray level characteristic and color balance, and a stable reproduced image can be obtained.

摘要翻译： 在用于彩色激光打印机的图像质量稳定器中，补偿由温度和湿度变化引起的灰度特性和颜色平衡的变化，以便稳定再现的图像。 该装置包括温度和湿度传感器，上限校正表，伽马校正表和混合颜色校正表，每个优化相对于参考环境，用于那些表的插值装置和用于校正的灰度级校正装置 具有由插值装置获得的校正系数的灰度级和用于利用线性变换补偿颜色平衡的任何故障的混合色校正装置。 利用这种配置，校正系数被修改以便建立稳定的灰度特性和色彩平衡，并且可以获得稳定的再现图像。