一种基于区域映射和领域扩展的快速图像放大算法  

Algorithm for image zoom based on sub-block mapping and area extension

作　　者：李响[1] 严晓浪[1] 傅凌进[2] 

机构地区：[1]浙江大学超大规模集成电路设计研究所,浙江杭州310027 [2]浙江大学 现代光学仪器国家重点实验室,浙江杭州310027

出　　处：《电路与系统学报》2012年第6期14-20,13,共8页Journal of Circuits and Systems

基　　金：中华人民共和国科技部科技型中小企业技术创新基金(07C26213301377)

摘　　要：本文提出一种面向低成本嵌入式应用的快速图像在线放大算法。通过将原始图像划分为区域子图,利用查表映射法将其逐一放大形成新区域子图,进而合成放大后的目标图像。本文以双立方插值为基准动态构建放大表,进一步提出了一种根据领域扩展信息计算可变像素放大表的改进映射方法,有效解决了区域间连接不连续、平滑度低缺陷。实验结果显示,本算法与双立方插值法效果相当,但时间损耗仅为其23%,且对图像实时放大无视觉时滞,具有良好的实际应用价值。This paper presents a real time image zoom algorithm based on low-cost embedded platforms, which divides the original image into sub-regions, then lookups using table mapping method to enlarge each sub-regions, to restore the full image. After building the mapping table data based on bi-cubic interpolation, an improved algorithm is proposed to solve the aliasing problem of connecting parts, by using alterable data in the mapping table. The experimental results.show that the algorithm provides similar image quality compared with bi-cubic interpolation algorithm, with only 23% time consumption. The algorithm can be used in real time environment without noticeable delay; the practical value is very high,

关 键 词：图像放大 查表映射 领域分析 可变数据 图像插值 嵌入式系统 

分 类 号：TP368.2[自动化与计算机技术—计算机系统结构]