参考特征 meaning in English

reference feature

In this method , the principal axes method is used to estimate the parameters of the transformation , then with the estimated pamameters as the initialization of powell optimization method and with all of the available information as the feature , a high accurate registration is achieved by calculating the minimum standard deviation between the registered images
该方法首先采用主轴法对变换参数进行初步估计，之后采用powell最优化算法，利用全图像灰度信息来作为图像的参考特征，通过计算配准图像之间差的平方和的极值来实现图像配准，从而提高了配准精度。