利用小波变换更好地放大图像，该算法是先构造一个用Besov范数估计图像正则性的变分泛函，然后在小波域中最小化变分泛函得到放大图像。小波变换后的高频分量具有丰富的细节边缘信息，因而能够重构出高质量的图像，而且文中新算法具有运行时间短、速度快的特点。-Using Wavelet Transform better to enlarge the image, the algorithm is to construct a Besov norm is estimated by the image regularity of variational functionals, and then in the wavelet domain to minimize the variational functionals be to enlarge the image. After the wavelet transform of the high-frequency component with rich details of the edge information, which can high-quality reconstructed images, and text in the new algorithm has running time is short, fast characteristics.