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    • 2. 发明授权
    • Image processing method and image processing apparatus
    • 图像处理方法和图像处理装置
    • US07948657B2
    • 2011-05-24
    • US11473238
    • 2006-06-23
    • Tomokazu YanaiAtsushi Ushiroda
    • Tomokazu YanaiAtsushi Ushiroda
    • H04N1/40G06K15/00
    • H04N1/40087
    • An image processing method for deciding the quantization data on each image plane of the image data composed of at least first and second image planes includes performing a quantization process for the sum total value of pixel values existing at the same position on the first and second image planes, using a first threshold, to decide a quantized value, and performing an arithmetical operation on the decided quantized value, the pixel value of any one of the first and second image planes and a second threshold, to generate the quantization data on each of the first and second image planes.
    • 用于决定由至少第一和第二图像平面组成的图像数据的每个图像平面上的量化数据的图像处理方法包括对存在于第一和第二图像上的相同位置处的像素值的总和值执行量化处理 平面,使用第一阈值来决定量化值,并对所确定的量化值,第一和第二图像平面中的任何一个的像素值和第二阈值执行算术运算,以在第一阈值和第二阈值之间生成量化数据 第一和第二图像平面。
    • 4. 发明授权
    • Image processing method and apparatus for performing halftone conversion
    • 用于进行半色调转换的图像处理方法和装置
    • US06831756B1
    • 2004-12-14
    • US09537290
    • 2000-03-29
    • Atsushi Ushiroda
    • Atsushi Ushiroda
    • H04N1405
    • H04N1/405H04N1/407H04N1/6097
    • From a first threshold mask having threshold values corresponding to the number of gray levels, which is larger than that of an input image, a second threshold mask having threshold values corresponding to the number of gray levels, which is equal to that of an input image, is generated on the basis of tone reproduction characteristics corresponding to the type of paper used in a printer or the printer state. Using the generated second threshold mask, the number of gray levels of the input image is converted, and the converted image is output to an output apparatus. In this manner, a high-quality image can be output by making halftone conversion corresponding to the tone reproduction characteristics of the output apparatus by a small memory size without decreasing the number of gray levels of the input image.
    • 从具有对应于大于输入图像的灰度级数的灰度级数的阈值的第一阈值掩码,具有与输入图像相等的灰度级数对应的阈值的第二阈值掩码 是基于与打印机中使用的纸张类型或打印机状态相对应的色调再现特性而生成的。 使用所生成的第二阈值掩码,转换输入图像的灰度级数,并将转换的图像输出到输出装置。以这种方式,可以通过对应于色调的半色调转换来输出高质量图像 通过小的存储器尺寸输出设备的再现特性,而不减少输入图像的灰度级数。
    • 5. 发明申请
    • IMAGE PROCESSING APPARATUS AND CONTROL METHOD THEREFOR
    • 图像处理装置及其控制方法
    • US20090097776A1
    • 2009-04-16
    • US12236185
    • 2008-09-23
    • Hitoshi FukamachiHideki KuboAtsushi Ushiroda
    • Hitoshi FukamachiHideki KuboAtsushi Ushiroda
    • G06K9/40
    • 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。
    • 9. 发明申请
    • IMAGE PROCESSING APPARATUS, IMAGE FORMING APPARATUS, AND CONTROL METHOD THEREOF
    • 图像处理装置,图像形成装置及其控制方法
    • US20110211208A1
    • 2011-09-01
    • US13102285
    • 2011-05-06
    • Tomokazu YanaiYumi WatanabeAtsushi UshirodaHisashi Ishikawa
    • Tomokazu YanaiYumi WatanabeAtsushi UshirodaHisashi Ishikawa
    • H04N1/60G06K15/10
    • G06K15/107H04N1/1911H04N1/1915H04N1/4053H04N1/4092H04N1/52
    • In order to form a high-quality image, upon execution of multi-pass printing using a printing head with a plurality of nozzles, an image processing apparatus calculates, using a scan duty setting unit (105), scan duty data for respective nozzles for each scan of the printing head in accordance with input image data. A halftone processor (108) generates a dot pattern to be formed by applying N-ary processing based on predetermined constraining condition information to the calculated scan duty data. A constraining condition information calculation unit (111) generates constraining condition information to be referred to by the halftone processor (108) at the time of the next scan. The constraining condition information is set so that the phase of a next dot pattern to be generated has an opposite phase relationship in a low frequency region with respect to the already printed dot pattern.
    • 为了形成高质量图像,在使用具有多个喷嘴的打印头执行多次打印时,图像处理装置使用扫描占空比设置单元(105)计算各喷嘴的扫描占空比数据 根据输入图像数据对打印头进行每次扫描。 半色调处理器​​(108)通过基于预定约束条件信息将N进制处理应用于计算出的扫描占空比数据,产生要形成的点阵图形。 约束条件信息计算单元(111)在下一次扫描时产生由半色调处理器​​(108)参考的约束条件信息。 约束条件信息被设置为使得相对于已经打印的点图案,要产生的下一点图案的相位在低频区域中具有相反的相位关系。