摘要
图像增强技术可分为局部增强和整体增强两种,各有优点。本文在分析文字图像褪化因素及特点的基础上,提出了基于自适应邻域对比度增强的直方图均衡法(HEANCE),它不仅能在增大整幅文字图像动态范围的同时增强局部对比度,去除扩散,而且能抑制一定的背景噪声。在此基础上,用灰度试拉伸技术进一步加大文字图像的对比度,去除背景噪声,可大大改善褪化文字的视觉效果。
The method of enhancing images can be classified into two types:local enhancement and global enhancement,each of which has its own advantages.Based on analysing features and factors of degraded hand-printed character image,the authors present a histogram equlization method hased on contrast enhancement of adaptive neighborhood.It not only enlarges the dynamic range of global image,but also restrains certain noises on the background.Thereby,the vision effect of degraded hand-printed Characters can be greatly improved by means of enhancing the contrast degree and removing the noise from background using the grey-stretch method.
关键词
褪化文字图像
图像增强
对比度增强
计算机
degraded hand-printed character image,image enhancement,contrast enhancement