一种基于渐变中心位移算法的复合半色调模型研究  

Composition Halftone Model Based on the Shift Algorithm of Gradual Change Center

作　　者：周啸[1] 史瑞芝[1] 李少梅[1] 范凯博 张凌梅[3] 

机构地区：[1]信息工程大学 [2]66173部队 [3]郑州航空工业管理学院

出　　处：《信息工程大学学报》2014年第6期748-753,共6页Journal of Information Engineering University

基　　金：国家自然科学基金资助项目(41071297)

摘　　要：复合半色调又称混合加网,是继幅度调制半色调和频率调制半色调之后出现的一种新型半色调技术,在结合二者优势的同时也存在一定问题,如两类不同性质网点的衔接过渡问题。文章在传统复合半色调思想的基础上,提出了一种基于渐变中心位移算法的复合半色调模型,通过不同阶调区域的划分,分析了两种性质网点不平滑衔接的原因。在建立位移等级渐变模型的基础上构建了网点位移模型,提出了网点位移的具体方法,并通过典型实例对该算法模型进行了研究。实例证明,文章提出的方法实现了中间调区域调幅加网、亮调区域和暗调区域调频加网的混合模式,同时获得两种不同性质网点的平滑衔接,避免了阶调跳变,能够得到良好的印刷图像质量和复制效果。Composition halftone, also known as Hybrid screening, is a new kind of halftone tech- nique after AM screening and FM screening, which combines advantages of the two screenings,but also has some problems, such as the connection and transition problem of the two screening types. On the basis of traditional composition halftone, this paper brings forward a composition halftone model based on the shift algorithm of the gradual change center. By dividing different tone zones, this paper analyzes the reasons why the two types will cause unsmooth connection. On the basis of setting up the shift grade gradual change model, it sets up the dot shift model and brings forward the specific method of dot shift, and then analyzes this algorithm model through some typical examples and gets the conclusion. These typical examples illustrate that the presented method realizes the hy- brid screening mode with middle tone AM screening, high key tone and low key tone FM screening. Meanwhile, the smooth connection of the two screening types is realized, which avoids the tone jump and can get excellent printing quality and copy effect.

关 键 词：渐变中心 位移算法 复合半色调 平滑过渡 

分 类 号：TS801[轻工技术与工程]