双层约束下基于局部和全局信息的图像插值新模型  

A Two-layer Constraint Image Interpolation Model Basing on Both Local and Global Information

作　　者：仵冀颖[1] 阮秋琦[1] 

机构地区：[1]北京交通大学信息科学研究所,北京100044

出　　处：《电子与信息学报》2008年第1期144-148,共5页Journal of Electronics & Information Technology

基　　金：国家973项目(2004CB318005);国家自然科学基金(60472033);教育部博士点基金(20030004023)资助课题

摘　　要：该文提出一种双层约束的图像插值模型,模型在原始未插值图像梯度模约束下同时基于局部和全局信息处理。使用偏微分方程处理边缘像素,锐化边缘同时平滑边缘块状效应;平滑区域像素点的插值操作使用非局部均值模型,非局部均值模型通过对原始图像全局信息加权平均得到待处理图像像素值,图像平滑。使用双层约束模型处理纹理图像可以保持纹理特征,平滑纹理部分线形特征位置的块状效应。最后理论和实验结果证明使用双层控制模型可以直接将噪声图像插值放大。In this paper, a novel two-layer constraint image interpolation model is proposed. The novel model interpolates image under the constraint of gradient magnitude in original un-interpolated image. The edge pixel is processed by Partial Differential Equation （PDE）. PDE enhances edge and smoothes jaggies in the edge. The pixel in smooth regions of under-interpolated image is processed by Non Local （NL）-means model. NL-means model gets gray value of pixel by weighted averaging global information in image and image is smoothed. Texture image interpolated by the novel model preserves the entire texture pattern; the jaggies in linear structure of texture is smoothed too. It is even proved by theory and experiments that noisy image can be interpolated directly to the required size using this novel model.

关 键 词：图像插值 偏微分方程 非局部均值 双层约束 

分 类 号：TN911.73[电子电信—通信与信息系统]