中文说明： 这段代码注册 2 维图像。图像之间的转换被建模作为局部仿射，而是全球 平滑，并明确图像强度的当地和全球变化的帐户。该算法建立在 一个差的多尺度框架。
English Description：
This code registers 2-D images. The transformation between images is modeled as locally affine but globally smooth, and explicitly accounts for local and global variations in image intensities. The algorithm is built upon a differential multiscale framework.