公开(公告)号：US06442300B1

公开(公告)日：2002-08-27

申请号：US09225667

申请日：1999-01-05

申请人： Charles M. Hains

发明人： Charles M. Hains

IPC分类号： G06K138

CPC分类号： H04N1/4052

摘要： A method of generating one image dot from three image pixels. The values of the three pixels are summed. If the sum indicates a dot that is equal to or darker than ⅔ black, the two outer thirds of the dot are set to black and the central third is set to a shade of gray. If the sum indicates a dot that is equal to or lighter than ⅓ white, central third of the dot is set to white and the outer two thirds are set to a shade of gray. The shades of gray are generated by using high addressability, and error diffusion is used to diffuse the rounding off errors implicit in the high addressability process.

摘要翻译： 从三个图像像素生成一个图像点的方法。 将三个像素的值相加。 如果总和表示等于或暗于⅔黑色的点，则点的两个外部三分之二设置为黑色，中央第三个设置为灰色阴影。 如果总和表示等于或小于1/3的点，则点的中心三分之一设置为白色，外部三分之二设置为灰色。 通过使用高可寻址性生成灰色阴影，并且使用误差扩散来扩展在高可寻址性过程中隐含的舍入误差。