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2. 发明授权

US5418627A Screen dot image recording method 失效
标题翻译：屏幕点图像记录方法
公开(公告)号：US5418627A
公开(公告)日：1995-05-23
申请号：US942444
申请日：1992-09-09
申请人： Yasu Sato , Kyonosuke Yamamoto
发明人： Yasu Sato , Kyonosuke Yamamoto
IPC分类号： G03F5/00 , G06K15/00 , H04N1/405 , H04N1/52 , H04N1/40
CPC分类号： G06K15/00 , H04N1/4058
摘要： A screen dot image recording method is disclosed in which whether or not each minimum recording element of an image recording system is to be recorded is determined on the basis of a gray level obtained from an original. A matrix is prepared which has a size capable of including each of screen dot blocks arranged at a predetermined pitch in directions inclined at a predetermined angle with respect to an orthogonal coordinate system based on recording directions of the recording system and has a plurality of matrix elements one of which is defined as a reference element. From among reference points which have a fixed positional relationship therebetween in the screen dot blocks, there is determined a reference point which exists in a screen dot block including a recording element. Another recording element has a coordinate value obtained by converting the coordinate of the determined reference point into an integer value. There is selected a matrix element having a positional relation of that matrix element with the reference element of the matrix which is the same as a positional relation of the recording element with said another recording element. The selected matrix element is compared as a threshold value with a gray level assigned to the recording element to determine whether or not the recording element is to be recorded as a part of a screen dot. Thereby, there is recorded a screen dot image which has any screen angle and any screen pitch and in which each screen dot has a desired form and a desired size corresponding to a gray level.
摘要翻译：公开了一种屏幕点图像记录方法，其中基于从原件获得的灰度级来确定是否要记录图像记录系统的每个最小记录元素。准备一种矩阵，该矩阵具有能够基于记录系统的记录方向包括以相对于正交坐标系以预定角度倾斜以预定间距布置的每个屏幕点块的尺寸，并且具有多个矩阵元素其中之一被定义为参考元素。在屏幕点块中具有固定位置关系的参考点中，确定存在于包括记录元素的屏幕点块中的参考点。另一个记录元件具有通过将确定的参考点的坐标转换为整数值而获得的坐标值。选择具有该矩阵元素与矩阵的参考元素的位置关系的矩阵元素，其与记录元件与所述另一记录元件的位置关系相同。所选择的矩阵元素被比较为具有分配给记录元素的灰度级的阈值，以确定记录元素是否被记录为屏幕点的一部分。因此，记录了具有任何屏幕角度和任何屏幕间距的屏幕点图像，并且其中每个屏幕点具有期望的形式和对应于灰度级的所需尺寸。

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