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发明申请
US20050094212A1 Halftone dot formation method, halftone dot formation apparatus, threshold matrix generation method used therefor and halftone dot recording medium 失效
半色调点形成方法，半色调点形成装置，用于其的阈值矩阵生成方法和半色调点记录介质

Halftone dot formation method, halftone dot formation apparatus, threshold matrix generation method used therefor and halftone dot recording medium
摘要：
Halftone cells each serving as a unit for formation of a dot are arranged in irregular shapes at random and divided into two groups. The halftone cells (720) in the first group are fewer than the halftone cells (730) in the second group and dispersed, and the area of each of the halftone cells (720) in the first group is set larger than that in the second group. The dot growth speed of the halftone cells (720) in the first group is higher than that of the halftone cells (730) in the second group. This allows formation of fine halftone dots consisting of the halftone cells in the first and second groups, and it is possible to reduce banding appearing in a main scan direction during recording of the halftone dots, with low-frequency components in spatial frequency of the halftone dots caused by the halftone cells (720) in the first group.
摘要（中）：

每个用作形成点的单元的半色调单元被随机布置成不规则形状并分成两组。 第一组中的半色调细胞（720）比第二组中的半色调细胞（730）少，并且分散，并且第一组中的每个半色调细胞（720）的面积被设定为大于第二组中的半色调细胞 组。 第一组中的半色调细胞（720）的点生长速度高于第二组中的半色调细胞（730）的点生长速度。 这允许形成由第一和第二组中的半色调细胞组成的细的半色调点，并且可以减少在半色调点记录期间在主扫描方向上出现的条纹，其中半色调的空间频率的低频分量 由第一组中的半色调细胞（720）引起的点。

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