发明名称 Threshold matrix, and method and apparatus of reproducing gray levels using threshold matrix
摘要 When one-to-one correspondence is made between each pixel of an original image and each element of a threshold matrix, a density of each pixel in an output image is represented by binary or multivalue, and a dot pattern of which the size corresponds to the threshold matrix is divided into small blocks, the threshold matrix is created such that the number of dots in each of all the blocks is made equal in all gray levels, the dot patterns in the plural blocks are made mutually the same in all the gray levels, and at a boundary of the blocks where the dot patterns are made mutually the same, the dots are increased while taking conformity of the dot patterns, or the threshold matrix is created such that order of dot increase is controlled between the blocks where the dot patterns are made mutually the same and the other blocks. Thus, the threshold matrix by which uniformity of the dot pattern is increased and a problem of texture is improved, a gray level reproduction method which uses this threshold matrix, and a gray level reproduction apparatus which uses this threshold matrix are provided.
申请公布号 US2001038465(A1) 申请公布日期 2001.11.08
申请号 US20010826934 申请日期 2001.04.06
申请人 OKINAKA KEIJI;SUZUKI TAKASHI 发明人 OKINAKA KEIJI;SUZUKI TAKASHI
分类号 B41J2/52;G06T5/00;H04N1/40;H04N1/405;(IPC1-7):H04N1/40 主分类号 B41J2/52
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