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    • 5. 发明授权
    • Method and apparatus for color conversion
    • 用于颜色转换的方法和装置
    • US5428465A
    • 1995-06-27
    • US928373
    • 1992-08-12
    • Katsuhiro KanamoriOsamu YamadaHideto MotomuraToshiharu KurosawaTeruo Fumoto
    • Katsuhiro KanamoriOsamu YamadaHideto MotomuraToshiharu KurosawaTeruo Fumoto
    • G03F3/08H04N1/60H04N1/46
    • H04N1/6016
    • The present invention relates to a method and apparatus applied to a widely-used and high-speed color conversion which is utilized in a color printer, a color display apparatus and the like, and provides a novel three-dimensional interpolation operation by use of a triangle-pole shaped interpolation unit-space. Input color signals R,G, and B are converted into lightness signal Y and chromaticity signals Cr, Cb which constitute a three-dimensional space. This three-dimensional space is dissected into rectangular parallelopipeds and is further divided into two prisms having base planes parallel to the chromaticity plane CrCb. A prism judging section 207 judges which of prisms an input color is involved in. There are provided a plurality of color conversion table memories 210.about.215 which store output values corresponding to input values constituting respective points of the prism and difference values of mutual output colors and further difference values of mutual difference values. Stored data in respective color conversion table memories 210.about.215 are weighted by lower-bit signals 205, 206 of the input color signals in multipliers 219, 220, 226, 227, and 230. Then, these data are added in adders 220, 221, 228, 229, and 231 so as to accomplish a linear interpolation using output values of six vertices which constitute the prism.
    • 本发明涉及一种应用于彩色打印机,彩色显示装置等中的广泛使用和高速色彩转换的方法和装置,并且通过使用 三角形插值单元空间。 输入颜色信号R,G和B被转换为构成三维空间的亮度信号Y和色度信号Cr,Cb。 该三维空间被解剖为长方体形,并被进一步分成具有平行于色度平面CrCb的基面的两个棱镜。 棱镜判断部分207判断涉及棱镜的输入颜色。多个颜色转换表存储器210差分存储器210存储对应于构成棱镜的各个点的输入值的输出值和相互输出颜色的差值 以及相互差值的其他差值。 在乘法器219,220,226,227和230中的输入彩色信号的低位信号205,206对相应的颜色转换表存储器210差分215中的存储数据进行加权。然后,这些数据被加到加法器220,221 ,228,229,231,以便使用构成棱镜的六个顶点的输出值来实现线性插值。
    • 9. 发明申请
    • Image processing method and program for processing image
    • 图像处理方法和图像处理程序
    • US20050254094A1
    • 2005-11-17
    • US10466603
    • 2002-01-22
    • Yasuhiro KuwaharaToshiharu Kurosawa
    • Yasuhiro KuwaharaToshiharu Kurosawa
    • G06F3/12G06T5/00H04N1/40H04N1/405H04N1/46H04N1/409H04N1/52H04N1/58
    • H04N1/4053
    • The invention relates to error distribution processing used for two-valued or multi-valued reproduction on a system recording or displaying a gradation image with several levels. The texture by error distribution processing is suppressed and the granularity of an image is controlled minutely. An accumulation error for the target pixel position is separated into first correction accumulation error and second correction accumulation error, the first correction accumulation error is added to data level of target pixel to generate correction level, multi-valuation level of correction level is determined, difference between correction level and multi-valued level is calculated, multi-valuation error is added to the second correction accumulation error to calculate correction multi-valuation error, error distribution value corresponding to unprocessed pixel adjacent to the target pixel is computed from correction multi-valuation error using a specific distribution coefficient, and the results and the accumulation error are added together to update the accumulation error.
    • 本发明涉及用于记录或显示具有几个等级的灰度图像的系统上的二值或多值再现的误差分布处理。 通过误差分布处理的纹理被抑制,并且图像的粒度被微小地控制。 目标像素位置的累积误差被分成第一校正累积误差和第二校正累积误差,第一校正累加误差被加到目标像素的数据电平以产生校正电平,校正电平的多值估计水平被确定 计算校正电平和多值电平之间的多值估计误差,以计算校正多值估计误差,对应于与目标像素相邻的未处理像素的误差分布值由校正多值估计 使用特定分布系数的误差,并将结果和累积误差相加在一起以更新累积误差。
    • 10. 发明授权
    • Compact optical waveguide
    • US6134369A
    • 2000-10-17
    • US282723
    • 1999-03-31
    • Toshiharu Kurosawa
    • Toshiharu Kurosawa
    • G02B6/12B23K26/00B23K101/36G02B6/122G02B26/00
    • G02B6/1225B82Y20/00G02B2006/12119
    • A compact optical waveguide employs a photonic band gap element as a reflector to enable a light beam to be reflected at angles greater than the critical angle. The photonic band gap device is a two-dimensional array of columnar holes formed in the substrate the holes are filled with air or another material having a different dielectric constant than the substrate. The optical waveguide forms a right angle bend and first and second photonic band gap devices are formed on both the inside and outside angles of the bend to deflect light which is incident on the waveguide at an angle greater than a critical angle defined by the materials that constitute the optical waveguide. The columnar holes of the photonic band gap element have a diameter of approximately one-half wavelength and are arranged in a triangular packing having an inter-column separation of approximately one-half wavelength of the light which is to be transmitted through the waveguide. The optical waveguide is formed by depositing a transmissive material having a first refractive index on top of a substrate which has a second refractive index and, using an ultrafast laser, cutting channels into the transmissive material to define straight portions of the waveguide and, also using the ultrafast laser, cutting the columns into the transmissive material to define the photonic band gap elements. In another example of the invention, the optical waveguide is formed by depositing a transmissive material having a first refractive index into a channel in a substrate which has a second refractive index and, using an ultrafast laser to cut the columns into the transmissive material to form the photonic band gap elements. In a final example of the invention, the optical waveguide is formed by depositing a transmissive material having a first refractive index which forms a channel on top of a substrate which has a second refractive index and, using an ultrafast laser to cut the columns into the transmissive material to form the photonic band gap elements.