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    • 12. 发明授权
    • Image processing apparatus and method for correcting print data so as to reduce density unevenness, and image forming system
    • 用于校正打印数据以减少浓度不均匀的图像处理装置和方法以及图像形成系统
    • US06970270B1
    • 2005-11-29
    • US09690089
    • 2000-10-17
    • Atsushi Ushiroda
    • Atsushi Ushiroda
    • B41J29/46B41J2/52G06K15/00H04N1/401H04N1/405
    • H04N1/405H04N1/4015
    • Disclosed are an image processing apparatus and method in which it is possible to suppress density unevenness in the output of an image forming apparatus in a simple manner. A test image is printed out by a printer (13), the printout is read by an image reading processing unit (10), and an analyzing processing unit (17) detects the output characteristic (density unevenness, printing position deviation, etc.) of each of a plurality of print elements possessed by the printhead of the printer. A mask generating processing unit (11) generates a threshold-value mask which reflects the output characteristics detected by the analyzing processing unit and stores the mask in a mask memory (15). A halftoning processing unit (12) outputs image data to the printer after the image data is subjected to halftoning utilizing the threshold-value map that has been stored in the mask memory.
    • 公开了一种能够以简单的方式抑制图像形成装置的输出中的浓度不均匀的图像处理装置和方法。 由打印机(13)打印测试图像,由图像读取处理单元(10)读取打印输出,并且分析处理单元(17)检测输出特性(浓度不均匀,打印位置偏差等) 由打印机的打印头所具有的多个打印元件中的每一个。 掩模产生处理单元(11)产生反映由分析处理单元检测的输出特性并将掩模存储在掩码存储器(15)中的阈值掩码。 半色调处理单元(12)使用已经存储在掩码存储器中的阈值图来对图像数据进行半色调之后,将图像数据输出到打印机。
    • 14. 发明授权
    • Image processing method and apparatus with storing and selecting of dot
patterns
    • 具有存储和选择点图案的图像处理方法和装置
    • US5638188A
    • 1997-06-10
    • US276807
    • 1994-07-18
    • Takahiro MoroKatsumi MasakiTakafumi SawakiAtsushi Ushiroda
    • Takahiro MoroKatsumi MasakiTakafumi SawakiAtsushi Ushiroda
    • H04N1/46G06T5/00H04N1/405H04N1/52G06K9/00
    • H04N1/4051
    • An image processing apparatus of a digital copying apparatus, digital facsimile, printer, or the like comprises an input unit to input multi-level data, an arithmetic operation circuit for adding error data to the input multi-level data and calculating error correction data, a selector to select a predetermined dot pattern on the basis of the error correction data, an error calculation circuit to calculate a difference between a representative value for each dot pattern and the error correction data; and a storing circuit for storing the difference as error data into a memory. The selector comprises a level classification threshold value storage memory in which threshold values to classify the error correction data into levels have been stored, and a data level determination circuit for classifying the error correction data into levels on the basis of the value of the error correction data and the value stored in the level classification threshold value storage memory.
    • 数字复印装置,数字传真机,打印机等的图像处理装置包括:输入单元,输入多级数据;算术运算电路,用于将误差数据与输入的多级数据相加,并计算误差校正数据; 基于纠错数据选择预定点阵图形的选择器,计算每个点阵图形的代表值与纠错数据之差的误差计算电路; 以及存储电路,用于将差值作为误差数据存储到存储器中。 选择器包括:电平分类阈值存储存储器,其中将纠错数据分类为电平的阈值已被存储;以及数据电平确定电路,用于根据纠错值将误差校正数据分类为电平 数据和存储在级别分类阈值存储存储器中的值。
    • 20. 发明授权
    • Image processing apparatus and control method for performing screen processing
    • 用于执行屏幕处理的图像处理装置和控制方法
    • US08687240B2
    • 2014-04-01
    • US12236185
    • 2008-09-23
    • Hitoshi FukamachiHideki KuboAtsushi Ushiroda
    • Hitoshi FukamachiHideki KuboAtsushi Ushiroda
    • G06T5/00G06K9/40G03G13/04
    • G06K15/1881H04N1/405H04N1/4092
    • This invention obtains a high-quality output image in which a jaggy or a disconnection of a thin line hardly stands out. An edge detection unit detects whether the pixel of interest is an edge pixel or a non-edge pixel. A screen processing unit performs screen processing for the pixel of interest to determine the output value of the N-level tone. A calculation unit performs filtering processing having a preset visual sense characteristic for an area including the pixel of interest to calculate the target value of the pixel of interest, and corrects the value of the pixel of interest so as to come close to the target value, thereby determining the output value of the N-level tone. The selector selects, according to the detection result by the edge detection unit, either the result from the calculation unit or that from the screen processing unit.
    • 本发明获得了粗纱或细线的断开几乎不突出的高质量输出图像。 边缘检测单元检测感兴趣的像素是边缘像素还是非边缘像素。 屏幕处理单元对感兴趣的像素执行屏幕处理以确定N级音调的输出值。 计算单元对包括感兴趣像素的区域执行具有预设的视觉特性的滤波处理,以计算感兴趣像素的目标值,并且校正感兴趣像素的值以接近目标值, 从而确定N级音调的输出值。 选择器根据边缘检测单元的检测结果选择来自计算单元的结果或来自屏幕处理单元的结果。