公开(公告)号：EP0745484B1

公开(公告)日：2002-03-13

申请号：EP96201353.8

申请日：1996-05-17

申请人： Océ Graphics France S.A.

发明人： Berche, Stéphane ,  WU, Yifeng ,  Lermant, Pierre L.

IPC分类号： B41J2/21 ,  G06K15/10

CPC分类号： G06K15/107 ,  B41J2/2132

公开(公告)号：EP0745484A1

公开(公告)日：1996-12-04

申请号：EP96201353.8

申请日：1996-05-17

申请人： Océ Graphics France S.A.

发明人： Berche, Stéphane ,  WU, Yifeng ,  Lermant, Pierre L.

IPC分类号： B41J2/21 ,  G06K15/10

CPC分类号： G06K15/107 ,  B41J2/2132

摘要： M different complementary binary masks each having the form of a matrix of points occupying N rows and P columns are defined in such a manner that each of the N x P elements of a mask has a first value or a second value, each point of the matrix corresponding to an element having the first value in one mask and in one mask only. Each portion of the image is printed in M passes of the print head while using the M different masks in succession, such that during each pass, the print head scans a strip of the print medium, the same mask being used repetitively for each group of P columns and N rows, an image dot being released for printing during a pass when the corresponding element of the mask has the first value. The masks used are of sufficiently large dimensions to avoid perceptible repetitive patterns appearing, the elements having the first value being distributed therein in a manner that is pseudo-random and substantially uniform.

摘要翻译： 每个具有占据N行和P列的点的矩阵的形式的不同的互补二进制掩码以这样的方式被定义，即掩码的每个N×P个元素具有第一值或第二值， 矩阵对应于在一个掩码中具有第一值的元素，并且仅在一个掩码中。 在连续使用M个不同的掩模的同时，图像的每个部分以打印头的M遍打印，使得在每次通过期间，打印头扫描打印介质的条带，对于每组的重复地使用相同的掩模 P列和N行，当掩模的相应元素具有第一值时，在通过期间释放用于打印的图像点。 使用的掩模具有足够大的尺寸以避免出现可察觉的重复图案，具有第一值的元件以伪随机和基本均匀的方式分布在其中。