公开(公告)号：EP0082281A1

公开(公告)日：1983-06-29

申请号：EP82110209.2

申请日：1982-11-05

申请人： International Business Machines Corporation

发明人： Bassetti, Larry William ,  Hooker, Ross Brian, III ,  Kantor, Sherwood

IPC分类号： G06K15/12

CPC分类号： G06K15/128

摘要： The apparent resolution of electrophotographic printer is enhanced accomplished by writing a gray or half-tone halo along the periphery of images written on the photoconductor. A laser directs a light beam onto the photoconductor to write white pels by discharge. The intensity of the light beam is lessened to write gray pels and the light beam is interrupted to write black pels of the image in undischarged areas. The pels are written sequentially in columns. When the image with its half-tone halo is developed, transferred and fixed by steps in the electrophotographic process, the printed image has a substantially smooth contour. In effect, the gray halo placed around the image merges with the black interior of the image when the image is developed, transferred and fixed. To prevent the image from appearing to be too thick after its contour has been smoothed by the use of the half-tone halo, the number of black picture elements used to write the image on the photoconductor are reduced. Also, the width of image segments making up the image may be adjusted by changing the level of gray used to write the half-tone halo.

摘要翻译： 通过沿写入光电导体的图像的周边写入灰色或半色调光环来增强电子照相打印机的表观分辨率。 激光器将光束引导到光电导体上，通过放电来写入白色像素。 光束的强度减小到写入灰色像素，并且光束被中断以在未放电区域中写入图像的黑色像素。 像素按顺序写入列。 当其半色调晕影的图像通过电子照相处理中的步骤显影，转印和固定时，打印的图像具有基本平滑的轮廓。 实际上，当图像被显影，转印和固定时，放置在图像周围的灰色晕圈与图像的黑色内部融合。 为了防止在通过使用半色调光环平滑其轮廓之后图像看起来太厚，用于在感光体上写入图像的黑色图像元素的数量减少。 此外，可以通过改变用于写入半色调晕的灰度级来调整构成图像的图像段的宽度。

公开(公告)号：EP0082281B1

公开(公告)日：1986-03-19

申请号：EP82110209.2

申请日：1982-11-05

申请人： International Business Machines Corporation

发明人： Bassetti, Larry William ,  Hooker, Ross Brian, III ,  Kantor, Sherwood

IPC分类号： G06K15/12

CPC分类号： G06K15/128