自动调焦中的评价区域自动选取

Automatic Selection of Evaluation Patch in Autofocusing

在对航天遥感图像的调焦评价中,为提高评价效率,提出了采用交互和自动方式选取评价区域的方法。首先根据地球同步轨道遥感图像中的明显且封闭的地球轮廓建立参考系,排除图像的平移、缩放的配准问题。接着依据图像特点,确定了交互方式选取评价区域的准则。自动选取方式的实现采用四叉树分解的方法对图像进行分裂合并操作,以获得满足边缘提取门限的任意形状调焦评价区域。上述方法在调焦评价中显著提高了效率。

To improve the efficiency in autofocusing evaluation of remote sensing images, interactive and automatic evaluation patch selection has been proposed. The distinct and closed boundary between earth and cold space have been referenced as the coordinate to eliminate the shift and zoom effect in image registration. Some criterions of patch selection in interactive evaluation have been proposed based on the characteristics of images. In automatic selection, image dividing and uniting by quadtree have been proposed to acquire evaluation patch of arbitrary shape that contains edge only. These approaches have greatly improved the evaluation efficiency.