双三次插值 meaning in English

bicubic interpolation

And the researches of the article have been done as follows : firstly , about the adjustment of rotation , a method , based on susan corner detection algorithm , is presented in the thesis . and the rotated image is rectified exactly by the symmetry of the portrait image and the invariant to rotation of shoulder corner . then the detail of images is preserved by the approximately geometrical processing based on the bicubic interpolation algorithm
具体工作如下:第一,在旋转调整方面,本文采用了一种基于susan角点检测的算法,利用了人像所具有的对称性以及肩部拐点旋转不变特性比较准确的实现旋转校正;并采用了双三次插值方法对图像作几何近似处理,很好的保持原图像的细节。