公开(公告)号：US5001767A

公开(公告)日：1991-03-19

申请号：US277605

申请日：1988-11-29

申请人： Hitoshi Yoneda ,  Hironobu Machida ,  Hiroki Kanno ,  Koji Izawa

发明人： Hitoshi Yoneda ,  Hironobu Machida ,  Hiroki Kanno ,  Koji Izawa

IPC分类号： G06T5/00

CPC分类号： G06T5/001 ,  G06K9/00456 ,  G06T2207/30176

摘要： An image processing device capable of processing images containing poorly contrasted letters and/or bold letters in addition to well contrasted letters and pictures such that both resolutions of letters and tones of pictures can be preserved. The device may includes a circuit to distinguish two level images from non two level images according to image concentration related quantity, and a circuit to distinguish picture images out of non two level images according to another image concentration related quantity. The device may include a circuit to distinguish letters from pictures according to the maximum and the minimum values of the image concentration related quantity. The device may includes a circuit to distinguish letters from pictures according to the maximum and the minimum values of changes in the image concentration related quantity. The device may include a circuit to distinguish letters from pictures according to the square sum average of differences in the image concentration related quantity between neighboring picture elements.

摘要翻译： 一种图像处理装置，其能够处理除对比较好的字母和图片之外的差的对比字母和/或粗体字的图像，使得可以保留图像的字母和色调的两个分辨率。 该装置可以包括根据图像浓度相关量来区分两级图像与非二级图像的电路，以及根据另一图像浓度相关量从非二级图像区分图像图像的电路。 该装置可以包括根据图像浓度相关量的最大值和最小值来区分字母与图像的电路。 该装置可以包括根据图像浓度相关量的变化的最大值和最小值来区分字母与图像的电路。 该装置可以包括根据相邻图像元素之间的图像浓度相关量的差的平方和平均值来区分字母与图像的电路。