多级半色调技术在电纸书显示优化中的应用

针对电纸书显示屏灰度等级不足的问题,提出了利用半色调图像处理技术的改进算法实现电纸书显示优化的方法.在阐述半色调技术与电子纸特点的基础上,介绍了抖动算法和误差扩散算法,通过对这两种算法进行改进提高电纸书显示的灰度级数及视觉效果.其中重点对误差扩散算法中的阈值、滤波器及扫描方式的设定进行设计,并提出一种基于误差动态检测的新的改进算法,能有效提高图像灰度级数,改善电纸书的图像显示质量.最后在电纸书系统平台上实现仿真,通过质量评价参数客观地评测了各种算法.

Multitoning Technology Application in the Electric Paper Books Display Optimization

In order to solve the problem that electric paper books have insufficient gray-scales, the improvement algorithm of halftone image processing technology is proposed to realize electric paper books display optimization. On the basis of halftone technology and characteristics of electronic paper, this paper introduces the dithering algorithm and error diffusion algorithm. By improving this two algorithms, the electric paper books can display more gray-scales and have better visual effect. The research is focused on threshold, filter and specific scanning mode of the error diffusion algorithm. A new improved algorithm based on dynamic error detection is put forward in the paper which can effectively improve image gray-scales and greatly improve the image display quality of the electric paper books. Finally, the simulation in the electric paper books system platform is realized and the algorithms mentioned are evaluated by objective image quality assessment.