全相位U变换图像内插方法

All phases U transform for image interpolation

构造了一种具有菱形支撑的2维全相位双正交U变换内插模板。利用正交U变换的列率递增特性,依据具有线性相位特性的全相位数字滤波理论,推导了全相位U变换列率滤波器的构造方法,在此基础上利用二维菱形半带低通滤波器设计理论构造了图像内插模板。利用构造的内插模板,提出了一种图像内插方法。实验结果表明,与双三次样条内插和其它全相位内插方法相比,全相位U逆变换图像放大方法的结果是最优的。

Two dimensional all phase image interpolation template with standard diamond-shaped support was constructed.Using all phase linear filter theory and orthogonal U transform's sequence characteristics,we deduced all phase U sequence filter was deduced,and then image interpolation template was constructed.According to the constructed template,a new image interpolation algorithm was proposed.The experimental result shows that the proposed method is optimal compared with bicubic interpolation and the other image interpolation methods based on all phase filter.