Distributed PWM halftoning unit and printer
    2.
    发明授权
    Distributed PWM halftoning unit and printer 失效
    分布式PWM半色调单元和打印机

    公开(公告)号:US06191868B1

    公开(公告)日:2001-02-20

    申请号:US09146348

    申请日:1998-09-03

    IPC分类号: H04N152

    CPC分类号: H04N1/4058

    摘要: In a halftoning unit of a laser printer and the like, a high speed, high density and high gradations halftoning is realized by multi-value implementation by clustered dot concentrated dither halftoning (known as a sub-matrix method) and PWM distributing gradation among the plurality of halftone dots with a small memory and circuit. For this purpose, the value of the difference between an input gradation value ni and a threshold value nc, &Dgr;n=ni−nc, is shortened within a range of 0 to &Dgr;h and the lower s bit of &Dgr;h is removed by a round-down or round-up process. Meanwhile, a threshold array is generated from an extended threshold pattern obtained by combining threshold patterns of 2s whose threshold interval is &Dgr;h, i.e. &Dgr;Ah×K, &Dgr;h×K+1, . . . , &Dgr;×K+2(s−1). Thereby, a halftone dot dither process in which the PWM gradation increases distributively among the 2s dots may be realized with a small scale memory and circuit.

    摘要翻译: 在激光打印机等的半色调单元中,通过集群点集中抖动半色调(称为子矩阵法)的多值实现和PWM分配灰度等级来实现高速,高密度和高等级的半色调 多个具有小存储器和电路的半色调点。 为此,输入灰度值ni和阈值nc之间的差值DELTAn = ni-nc在0到DELTAh的范围内缩短,并且通过向下舍入来去除DELTAh的较低s位 或综合处理。 同时,通过组合其阈值间隔为DELTAh的2s的阈值模式(即DELTAAhxK,DELTAhxK + 1)获得的扩展阈值模式来生成阈值阵列。 。 。 ,DELTAxK + 2(s-1)。 由此,可以利用小尺度的存储器和电路来实现其中PWM等级在2s点之间分布增加的半色调点抖动处理。

    Image output device and test chart for the same
    3.
    发明授权
    Image output device and test chart for the same 有权
    图像输出设备和测试图相同

    公开(公告)号:US07130076B2

    公开(公告)日:2006-10-31

    申请号:US09911715

    申请日:2001-07-25

    IPC分类号: B41J1/00 H04N1/00

    CPC分类号: H04N1/6033

    摘要: In an image output device a test chart 18 including tests charts 6 of each color is used, and a tone correction table is calculated. The test charts 6 are patterned in a checkered pattern, each including continuous areas 10 in which the tones increase in steps and reference areas 11 for comparison with the continuous areas 10. The reference areas 11 are formed of white ground of paper in a highlight proof part 7, a solid pattern with a maximum density in a shadow proof part 8, and halftone dot-concentrated or line screens with a lower resolution than in the continuous areas in a middle proof part 9. Tone correction values are calculated from characteristic values of the highlight, shadow and middle parts, obtained from visual data of the test chart 18.

    摘要翻译: 在图像输出装置中,使用包括各种颜色的测试图6的测试图18,并计算色调校正表。 测试图6以方格图案图案化,每个包括连续区域10,其中色调逐步增加,参考区域11与连续区域10进行比较。 参考区域11由高亮部分7中的白色地面纸,阴影部分8中具有最大密度的实心图案和具有比在连续区域中的连续区域中的分辨率低的网版点浓缩或线屏幕形成 中间证明部分9。 从测试图18的视觉数据获得的高光,阴影和中间部分的特征值计算音调校正值。

    Color image processing apparatus and color printer system
    4.
    发明申请
    Color image processing apparatus and color printer system 有权
    彩色图像处理装置和彩色打印机系统

    公开(公告)号:US20060197998A1

    公开(公告)日:2006-09-07

    申请号:US11362900

    申请日:2006-02-28

    IPC分类号: G03F3/08

    CPC分类号: H04N1/6022

    摘要: A color image processing apparatus includes: a minimum value selection unit that selects a minimum value of an input gray level values; a first calculation unit that calculates a generation amount of black; a second calculation unit that calculates an UCR amount which is a value relevant to the minimum value; a third calculation unit that outputs a correction coefficient value which is a value relevant to the minimum value; a subtraction unit that subtracts the UCR amount from each of the input gray level values to generate output; a multiplication unit that multiply the output of the subtraction unit by the correction coefficient value; a significant bit selection unit that selects a significant bit of a multiplication result; and a gray level correction unit that makes a gray level correction to the generation amount of black and the output of the multiplication unit.

    摘要翻译: 彩色图像处理装置包括:最小值选择单元,其选择输入灰度值的最小值; 计算黑色的产生量的第一计算单元; 第二计算单元,计算作为与所述最小值相关的值的UCR量; 第三计算单元,输出与最小值相关的值的校正系数值; 减法单元,从每个输入灰度值减去UCR量以产生输出; 乘法单元,将减法单元的输出乘以校正系数值; 选择乘法结果的有效位的有效位选择单元; 以及对黑色的产生量和乘法单元的输出进行灰度校正的灰度级校正单元。

    Halftoning device and halftoning method and laser printer including the same
    5.
    发明授权
    Halftoning device and halftoning method and laser printer including the same 有权
    半色调装置和半色调方法以及包括其的激光打印机

    公开(公告)号:US07948659B2

    公开(公告)日:2011-05-24

    申请号:US11507609

    申请日:2006-08-22

    IPC分类号: H04N1/405

    CPC分类号: H04N1/4056 H04N1/4072

    摘要: A halftoning device that converts an input pixel signal of 8 bits per pixel into an output pixel signal of r bits per pixel(r 8); a threshold value array storage that stores a threshold value array having a threshold value of 8 bits; and a threshold value expansion unit that expands the threshold value of 8 bits to expanded threshold value of n bits per pixel. A range of the expanded pixel signal output from the gradation correction unit is matched with a range of the expanded threshold value. The output pixel signal is set according to a comparison of the expanded pixel signal with the expanded threshold value corresponding to the threshold value that is selected for each input pixel signal.

    摘要翻译: 一种半色调装置,其将每像素8位的输入像素信号转换为每像素(r <8)的r位的输出像素信号,所述半色调装置包括:灰度校正单元,其将输入像素信号扩展为扩展像素信号 每像素n位(n> 8); 门限值阵列存储器,其存储阈值为8位的阈值阵列; 以及阈值扩展单元,其将8位的阈值扩展为每像素n位扩展的阈值。 从灰度校正单元输出的扩展像素信号的范围与扩展阈值的范围相匹配。 输出像素信号根据扩展像素信号与对应于每个输入像素信号选择的阈值的扩展阈值的比较来设置。

    Color image processing apparatus and color printer system
    6.
    发明授权
    Color image processing apparatus and color printer system 有权
    彩色图像处理装置和彩色打印机系统

    公开(公告)号:US07679781B2

    公开(公告)日:2010-03-16

    申请号:US11362900

    申请日:2006-02-28

    IPC分类号: G03F3/08

    CPC分类号: H04N1/6022

    摘要: A color image processing apparatus includes: a minimum value selection unit that selects a minimum value of an input gray level values; a first calculation unit that calculates a generation amount of black; a second calculation unit that calculates an UCR amount which is a value relevant to the minimum value; a third calculation unit that outputs a correction coefficient value which is a value relevant to the minimum value; a subtraction unit that subtracts the UCR amount from each of the input gray level values to generate output; a multiplication unit that multiply the output of the subtraction unit by the correction coefficient value; a significant bit selection unit that selects a significant bit of a multiplication result; and a gray level correction unit that makes a gray level correction to the generation amount of black and the output of the multiplication unit.

    摘要翻译: 彩色图像处理装置包括:最小值选择单元,其选择输入灰度值的最小值; 计算黑色的产生量的第一计算单元; 第二计算单元,计算作为与所述最小值相关的值的UCR量; 第三计算单元,输出与最小值相关的值的校正系数值; 减法单元,从每个输入灰度值减去UCR量以产生输出; 乘法单元,将减法单元的输出乘以校正系数值; 选择乘法结果的有效位的有效位选择单元; 以及对黑色的产生量和乘法单元的输出进行灰度校正的灰度级校正单元。

    Halftoning device and halftoning method
    7.
    发明申请
    Halftoning device and halftoning method 有权
    半色调设备和半色调方法

    公开(公告)号:US20070046999A1

    公开(公告)日:2007-03-01

    申请号:US11507609

    申请日:2006-08-22

    IPC分类号: G03F3/08 G06K15/00

    CPC分类号: H04N1/4056 H04N1/4072

    摘要: A halftoning device that converts an input pixel signal of 8 bits per pixel into an output pixel signal of r bits per pixel(r 8); a threshold value array storage that stores a threshold value array having a threshold value of 8 bits; and a threshold value expansion unit that expands the threshold value of 8 bits to expanded threshold value of n bits per pixel. A range of the expanded pixel signal output from the gradation correction unit is matched with a range of the expanded threshold value. The output pixel signal is set according to a comparison of the expanded pixel signal with the expanded threshold value corresponding to the threshold value that is selected for each input pixel signal.

    摘要翻译: 一种半色调装置,其将每像素8位的输入像素信号转换为每像素(r <8)的r位的输出像素信号,所述半色调装置包括:灰度校正单元,其将输入像素信号扩展为扩展像素信号 每像素n位(n> 8); 门限值阵列存储器,其存储阈值为8位的阈值阵列; 以及阈值扩展单元,其将8位的阈值扩展为每像素n位扩展阈值。 从灰度校正单元输出的扩展像素信号的范围与扩展阈值的范围相匹配。 输出像素信号根据扩展像素信号与对应于每个输入像素信号选择的阈值的扩展阈值的比较来设置。

    IMAGE FORMING APPARATUS
    8.
    发明申请

    公开(公告)号:US20200302253A1

    公开(公告)日:2020-09-24

    申请号:US16804598

    申请日:2020-02-28

    申请人: Takeshi Shibuya

    发明人: Takeshi Shibuya

    IPC分类号: G06K15/02

    摘要: An image forming apparatus includes a gradation converting circuit, a printer engine, an image inspecting circuit, and a color tone control circuit. The gradation converting circuit includes a threshold value generating section that generates threshold values, a first gradation correcting section that converts gradation values of image data, a second gradation correcting section that converts output values from the first gradation correcting section based on a gradation control parameter, and a gradation processing section that reduces tone levels of the second gradation correcting section by comparing output values from the second gradation correcting section and the threshold values. The color tone control circuit builds a prediction model for predicting, in response to the output values from the first gradation correcting section, measurement values to be measured by the image inspecting circuit, and corrects the gradation control parameter based on the measurement values and values predicted by e prediction model.