中文摘要：

为了尽可能地保持图像的基本信息,提高图像的视觉效果和空间分辨率,提出一种基于Contourlet的改进加权抛物线插值算法.该算法增加加权抛物线插值的误差补偿项,利用Sobel算子设定插值点的边缘方向,得到初始放大图像.利用Contourlet提取高频成份,原始图像幅值增强充当低频部分,再经过Contourlet逆变换得到高分辨率图像.实验结果表明,相对于传统的图像放大算法,该算法考虑了全局相关性,得到了更加清晰的边缘信息.

英文摘要：

In order to preserve the basic information of images and to improve their visual effect and space resolution,a novel image zooming algorithm was proposed by using improved weighted parabolic interpolation and Contourlet transformation.The proposed algorithm incorporates the error-amended part into the weighted parabolic interpolation algorithm.Directions of the interpolation points are determined by the Sobel operator,then we get a preliminary zoomed image.High-frequency components are got by a Contourlet transformation,and low-frequency components are replaced by the enhanced amplitude of the original image.A high-resolution image is achieved by inverse Contourlet transformation.The experimental results indicate that,compared with traditional image zooming algorithms,this algorithm can get clearer and sharper edges due to considerations of global pixels correlation of the original image.