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    • 5. 发明授权
    • Test pattern printing method, information processing apparatus and printing apparatus
    • 测试图案印刷方法,信息处理设备和打印设备
    • US06494557B1
    • 2002-12-17
    • US09551769
    • 2000-04-18
    • Masao KatoKentaro YanoDaigoro KanematsuMinako KatoMitsuhiro Ono
    • Masao KatoKentaro YanoDaigoro KanematsuMinako KatoMitsuhiro Ono
    • B41J201
    • H04N1/6033B41J2/2107B41J29/393
    • In the process of correcting a color deviation caused by output characteristic variations among different colorants in a printing apparatus, a method of printing a test pattern allows an appropriate and highly accurate visual detection of the color deviation. More specifically, the test pattern has a plurality of patches printed therein, each of which has placed adjacent to each other a test area to be checked for the color deviation and a reference area serving as a criterion for color deviation and which has the test area and the reference area repeated alternately. If the colors of the two areas look different during the comparison of only one pair of the test area and the reference area, the pattern of the two alternately repeated areas makes the colors of the two areas appear more uniform, alleviates a high color difference sensitivity and thereby enables easy identification of a patch that matches the accuracy of the correction performed according to the color deviation detection.
    • 在校正由打印装置中的不同着色剂之间的输出特性变化引起的颜色偏差的过程中,打印测试图案的方法允许对颜色偏差的适当和高精度的视觉检测。 更具体地,测试图案具有多个打印在其中的贴片,每个贴片彼此相邻放置要检查颜色偏差的测试区域和用作颜色偏差的标准的参考区域,并且具有测试区域 并且参考区域交替重复。 如果在仅比较一对测试区域和参考区域的情况下两个区域的颜色看起来不同,则两个交替重复区域的图案使得两个区域的颜色看起来更均匀,减轻了高的色差灵敏度 从而能够容易地识别与根据颜色偏差检测执行的校正的精度相匹配的贴片。
    • 6. 发明授权
    • Test pattern printing method, information processing apparatus and printing apparatus
    • 测试图案印刷方法,信息处理设备和打印设备
    • US06474768B1
    • 2002-11-05
    • US09551768
    • 2000-04-18
    • Kentaro YanoDaigoro KanematsuMasao KatoMinako KatoMitsuhiro Ono
    • Kentaro YanoDaigoro KanematsuMasao KatoMinako KatoMitsuhiro Ono
    • B41J201
    • H04N1/6033
    • In a correction processing that corrects a color deviation caused by output characteristic variations among print heads of a printing apparatus, the printing apparatus prints a test pattern that allows accurate detection of the color deviation by a visual check. More specifically, each of the patches in the test pattern is made up of two areas placed adjacent to each other. One of the two areas (upper area) is used as a test area for detecting the degree of the color deviation. Of the gradation values of C, M and Y, which make up the patch print data, the gradation values of C and M are changed among the patches making up the test pattern. The other area is used as a reference area printed with an achromatic color that represents a reference gradation value for the deviation detection. The gradation values of C, M, Y and K are determined so that a spatial frequency of dots formed in the reference area of each patch is close to the spatial frequency of the associated test area.
    • 在校正由打印装置的打印头之间的输出特性变化引起的颜色偏差的校正处理中,打印装置打印通过视觉检查准确检测颜色偏差的测试图案。 更具体地,测试图案中的每个贴片由彼此相邻放置的两个区域组成。 将两个区域(上部区域)中的一个用作检测颜色偏差程度的测试区域。 在构成贴片打印数据的C,M,Y的灰度值中,构成测试图案的补丁中的C和M的灰度值发生变化。 另一区域被用作用偏差检测表示参考灰度值的无彩色印刷的参考区域。 确定C,M,Y和K的灰度值,使得在每个贴片的参考区域中形成的点的空间频率接近相关测试区域的空间频率。
    • 8. 发明授权
    • Information processing apparatus, printing apparatus, information processing method and printing method
    • 信息处理装置,打印装置,信息处理方法和打印方法
    • US06390583B1
    • 2002-05-21
    • US09549719
    • 2000-04-14
    • Minako KatoKentaro YanoDaigoro KanematsuMasao KatoMitsuhiro Ono
    • Minako KatoKentaro YanoDaigoro KanematsuMasao KatoMitsuhiro Ono
    • B41J2205
    • H04N1/4015
    • An information processing apparatus, a printing apparatus, an information processing method and a printing method can print high quality images without lowering throughput by correcting density variations to within a range where they can hardly be perceived by the human eye as stripes or unevenness. With this invention, a print head having a plurality of nozzles capable of ejecting ink is used to print a test pattern based on image data with a predetermined gradation level. Then, based on read data of the test pattern, a temporary correction value &agr;′[N] is calculated which will made the print density of rasters corresponding to each of the plurality of nozzles constant. The temporary correction value &agr;40 [N] is limited by the upper limit &agr;U and the lower limit &agr;L so that it is limited to within a range between &agr;U and &agr;L.
    • 信息处理装置,打印装置,信息处理方法和打印方法可以通过将密度变化校正到几乎不被人眼察觉的范围内的条纹或不均匀性的范围内,而不降低生产率来打印高质量图像。 利用本发明,使用具有能够喷射墨水的多个喷嘴的打印头,以基于具有预定灰度级的图像数据打印测试图案。 然后,基于测试图案的读取数据,计算临时校正值α'[N],使得与多个喷嘴中的每一个对应的光栅的打印浓度恒定。 临时校正值α40[N]受限于上限αU和下限αL,因此被限制在αU和αL之间的范围内。