公开(公告)号：US4692811A

公开(公告)日：1987-09-08

申请号：US758961

申请日：1985-07-25

申请人： Hiroyoshi Tsuchiya ,  Toshiharu Kurosawa ,  Hirotaka Otsuka ,  Yuuji Maruyama ,  Katsuo Nakazato

发明人： Hiroyoshi Tsuchiya ,  Toshiharu Kurosawa ,  Hirotaka Otsuka ,  Yuuji Maruyama ,  Katsuo Nakazato

IPC分类号： H04N1/405 ,  H04N1/40

CPC分类号： H04N1/4052

摘要： The invention relates to a method for processing an image signal such that areas of original image data are sequentially scanned with a scanning window having a size corresponding to M picture elements in units of a predetermined number of picture elements so as to perform halftone display in accordance with black-and-white binary distribution with respect to the signal levels of the picture elements within the scanning window every time the scanning window is moved. The picture elements within the scanning window are assigned an order of preference in accordance with their image signal levels. A sum of the image signal levels of the picture elements within the scanning window is calculated, and A and N of the equations S=C.times.N+A are calculated, where C is a predetermined image signal level (e.g., black level and maximum level), N is an integer, and A is the image signal level falling within the range O.ltoreq.A

摘要翻译： 本发明涉及一种用于处理图像信号的方法，使得以预定数量的图像元素为单位的具有与M个图像元素相对应的尺寸的扫描窗口顺序地扫描原始图像数据的区域，以便按照该方式执行半色调显示 每次扫描窗口移动时，相对于扫描窗口内的图像元素的信号电平，具有黑白二进制分布。 扫描窗口内的图像元素根据其图像信号电平被分配优先顺序。 计算扫描窗口内的像素的图像信号电平的和，并计算等式S = CxN + A的A和N，其中C是预定的图像信号电平（例如，黑电平和最大电平） ，N是整数，A是图像信号电平落在范围O <= A